Published S

© Valmet

MaiExecutPneumatipulp, papefluids con

There are thousandsmachine rcontrol cabuilding l

This whitetips and e

September 12, 20

intentive Summic and hydrauer, board or ti

ntrol devices.

hundreds of s of pneumatiroom. They aabinets and paocation.

e paper presextensive trou

014

ance mary ulic controls pissue machin

different fluidic and hydraure housed in fanels. In some

nts safety andbleshooting c

Mainten

Tips

perform a vitae. Improved p

ds control cirulic control defloor mountee cases, they a

d general remcharts.

nance Tips - Flui

– Flu

al role in literaprocess efficie

rcuits on a typevices. The co

ed control benare also surfac

minders for flu

ds

uids

ally every opeency results fr

pical paper montrol devicesnchboards, frace mounted t

uids maintena

erational contfrom proper m

achine, usings are located eame mountedto nearby fram

ance, as well a

P

trol function omaintenance o

g literally everywhere ind and auxiliarming or a suit

as some practi

age | 1

of a of

n the ry table

ical

Published S

© Valmet

SafetyOnly trainthe machiapplicableprocedure

• As a gstartin

• Never

• Befor

• Beforsecure

• Alway

Next, repair

After starteare nofuses.

• Alwaythe m

• Verifypipeli

• Use a

• Avoid

• Befor

- Ifac

- C

• Use arequir

• Do noimpur

September 12, 20

y and genned personneine being wore sections in tes.

general rule, bng maintenan

r by-pass safe

e shutting do

e depressurized.

ys begin a hyd

close the appr).

stopping the rs for the eleco lockable moNever remov

ys begin pneumill air supply.

y that there isines, or actuat

ppropriate to

d spilling oil o

e removing a

f a valve has mctuator. Bleed

Close the shut-

ppropriate gared.

ot use cotton rities out. Alw

014

eral pracl should perfo

rked on (safethe relevant eq

both hydraulince or repair w

ty features, su

wn the system

zing circuits, m

draulic system

plicable isolati

pumps, and bctric motors sotor starters, rve someone el

umatic system. Next, bleed t

s no pressure tors which ne

ools and meth

on the floor. C

valve:

manual overrid off pressure

-off valve to t

askets or suita

rags or other ways pay atten

Mainten

tice remiorm maintenaty issues, desigquipment ope

c and pneumwork on any f

uch as guards

m, familiarize

make sure tha

m shutdown b

ion valves in t

before startinso that there isremove the mlse's lock-out

m shutdown bytrapped air fr

in the systemeed to be depr

hods for repair

Clean up any

ide controls, rrepeatedly in

he valve pane

able sealing co

lint cloth. Wntion to clean

nance Tips - Flui

nders ance or add ngn and operaterating and m

atic systems mfluid system.

or interlocks

yourself with

at all loads are

by stopping th

the system (b

ng any maintes no chance o

motor fuses. Putags.

y closing the om the circui

m, such as in pressurized.

r and mainten

oil spills imm

release any remn both directio

el.

ompound to s

hen changingnliness when s

ds

new devices. Ttion, and con

maintenance m

must be locke

s.

h the mill's loc

e in the lower

he pumps.

before perform

enance or repaof anyone acciut your name

hand valve wit.

ressure accum

nance work.

mediately.

maining presons.

seal threaded

g a cylinder, pservicing hyd

This includes ntrol circuits).manuals as we

ed out and de

ck out proced

red position o

ming the main

air work, lockidentally start

e on secured l

which isolates

mulators, air r

ssure between

connections

plug hose endraulic or pneu

P

familiarity w. Refer to ell as mill

pressurized b

dures.

or are mechan

ntenance or

k the motor ting them. If tocks and rem

the system fro

receivers,

n the valve and

in the system

ds to keep umatic system

age | 2

with

before

nically

there moved

om

d

m, as

ms.

Published S

© Valmet

• Re-tigfinishtight.

• Beforother pump

• BeforSystem

• Once systempressu

WARNI

• Makeand cl

• Keep

Genera

FamiliaWhen troand the restudy the

Once youmalfuncti

PressurAlways ch

If a specifthe system

September 12, 20

ghten disconnhing the maint

Re-tighten as

e energizing tmaintenance

ps, maintain a

e opening isom pressurizat

the system ism may need toure.

NG:

Hydrfor h(i.e., or ai

e sure that all lean.

instrument b

al trouble

rity with Coubleshootingelationships bcircuit diagra

have a full union by checkin

re Settingsheck the opera

fication is unam, without exc

014

nected pipe antenance works necessary.

the system, me work is in pra safe distance

olation valves,tion may caus

s pressurized, o be depressu

raulic and phydraulic or

wood, cardir under the

signs and not

boxes and cab

eshooting

Circuits g fluid circuitsbetween themams and the fl

nderstandingng the perform

s ating pressure

available, set tceeding the m

Mainten

nd hose couplk, verify that a

make sure thatrogress. Nevee from the are

, make sure thse machine co

test the repaiurized again to

pneumatic sr pneumaticdboard, etc.e skin. Seek

tices attached

inets closed.

g principl

s, it is importa. Therefore, t

fluid section o

g of a malfuncmance of each

es first. Some

the pressure tmaximum rati

nance Tips - Flui

lings immediall connection

t no one else ier remove anyeas where mai

hat no one is womponents to

ired componeo repair them

systems arec leaks with.) to avoid r

k emergency

to the machi

es

ant to have a fhe first step in

of the equipm

ctioning circuh component

pressure sett

o the lowest ling of the com

ds

iately after mans that have b

is in the viciniyone else's locintenance or

working betwo move unexp

ent. Check form. Do not tigh

e under high your handrisk of injecy help for a

ine or instrum

full understann troubleshoo

ment's mainten

uit, you can bet.

tings are speci

level that will mponents.

aintenance woeen serviced o

ity of the macck-out tags. Wrepair work t

ween the machpectedly.

r leaks. If anyhten leaky fitti

h pressure.s. Use anot

ction of hydany injuries.

ment compon

nding of all cioting any circnance manual

egin to isolate

ified on the c

allow adequa

P

ork. Prior to or repaired ar

chine, and noWhen starting took place.

hine compon

y are found, things under

. Do not testher materiaraulic fluid .

nents are in pl

ircuit componcuit should bel.

e the cause of

ircuit diagram

ate performan

age | 3

re

o the

ents.

he

st al

lace

nents e to

the

ms.

nce of

Published S

© Valmet

ElectricMost fluidmode reqtext assocde-energideterminehave not bcheck the

TroubleTrouble ishow to recguidelines

• Excesoperaintern

• Typicfault itempe

• Excescause viscos

Compon• If the

comp

If the actuwork towa

• New v

• On cohydra

HydrauA hydrauldirectiona

If there arnot drift, y

September 12, 20

al Controlsd circuits havuires that theiated with eaczed. This infoe whether all tbeen met, or ofluid compon

e Indications indicated whcognize troubs for recogniz

ssive heat meaation at relief vnal leakage of

cally, if oil temis found, locaeratures of dif

ssive noise coua relief valve

sity, low reser

nent Replaactuator has

ponents.

uator does notard the actuat

valves must b

omputerized saulic operatin

ulic drift tlic cylinder isal valve is leak

re shutoff valvyou might ass

014

s e at least two solenoid valvch circuit diagormation, comthe conditionother controlsnents themsel

ns henever circuble is to becomzing trouble in

ans trouble. Avalve setting.

f components

mperature excte and replacefferent device

uld mean weato stick or ch

rvoir level, or

acement Nofailed, start tr

t receive suffitor.

be adjusted an

systems, use tg problems.

troublesh experiencing

king. How can

ves on the cylisume that the

Mainten

operating moves in the circgram explains

mbined with tns have been ms are malfunclves.

uit performanme familiar wndications are

A warmer thanHydraulic fluand increase

ceeds 140 °F (6e any devices es to detect m

ar, misalignmhatter. These n

leaking suctio

otes roubleshootin

icient oil flow

nd locked or tu

the help and m

hooting tg drifting undn you tell whi

inder, you coe piston seals

nance Tips - Flui

odes (i.e.: extecuit be in a sps which valvethe applicablemet for a partctioning, corre

ce deviates frwith the norma

e as follows:

n normal tankuids which hathe heat rise.

60 °C), checkshowing redu

major leaks.

ment, cavitationoises may beon or pressur

ng from the ac

w or pressure,

uned to the se

maintenance

tips der load. You ich one is the

uld shut bothare OK.

ds

end/retract orpecific state (ees should be ee electrical draticular operatiect that probl

rom normal. Aal operation o

k return line oave too low a v.

k the cooling suced volumet

on, or air in the the result ofre lines.

ctuator and w

start troubles

ettings given

screens to loc

suspect the pproblem?

h of them. If y

r raise/lower)energized or denergized andawings shoulding mode. If tlem first, and

As a result, thof each circuit

on a relief valviscosity will

system. If no ctric efficiency

he fluid. Contf contaminati

work toward t

shooting at th

for the positi

cate and ident

piston seal and

you observe th

P

). Each operatde-energized)d which shouldd help you the condition then proceed

he best way tot. Some gener

lve indicates increase the

cooling systemy. Monitor the

aminated fluiion, excessive

the power uni

he power unit

on concerned

tify possible

d/or the

hat the load d

age | 4

ting . The d be

ns d to

learn ral

m e

id can

it

and

d.

does

Published S

© Valmet

However,fluid flowsupply preforce that

Another tpressure darea or oil

CC hydThese tipslatest train

Controllepumps to pumps to return oil The follow

The pumThe pumpthe rotatio

The driveRepair as

Intake pipproper vis

Figure 1. lead to pproductio

September 12, 20

even if the piws from the hig

essure was. Eqholds the loa

thing to checkdrop with no l lines for war

draulic uns are excerptening offerings

d Crown roll control shell lubricate sheto the hydrau

wing are troub

mp is not dp may be drivon of the pum

e shaft is broknecessary.

pe is blockedscosity. Filter

Hydraulic unit foor quality and on.

014

iston seals wegh to low prequal pressure

ad in place. So

k if the cylindwork taking prm oil.

nit troubleed from Valms, contact Ric

hydraulic undeflection th

ell load shoes, ulic unit. Pumbleshooting ti

delivering fven in the wr

mp as indicate

ken or the sha

d or the oil visthe oil as reco

failures lost

Mainten

ere totally gonssure side of t

es on unequal o the cylinder

der is suspect iplace, heat is g

eshootingmet training se

k Heitke at ri

nits (Figure 1)rough hydrodrotating bear

mp failures wiips to keep yo

fluid properong directioned by the arro

aft key is she

scosity is too ommended. C

in the reserv

Intake has a

The pump ithe air until

Fluid level iopening of tsure that it i

The hydraRelief valvevalve.

Worn pumthe rotor setexamination

nance Tips - Flui

ne, the load wthe piston andareas (cap encould still be

is temperaturgenerated. Th

g tips essions for opeichard.heitke@

) have pumpsdynamic or hrings and to cill lead to prodour CC roll hy

erly. n of rotationw on the pum

ared. Remove

heavy to primCheck the filtvoir.

air leaks. Che

is not priminl hydraulic flu

is too low. Ththe intake pipis filled to the

aulic systee is set too low

mp parts are cats and take thn of the pump

ds

would still not d equalizes at

nd greater thae the problem

re of the cylinherefore, you

erators and m@valmet.com

s for three mahydrostatic loacontrol tempeduct quality dydraulic units

n. Stop the pummp body.

e the pump fr

me. Drain theter for cleanlin

eck the intake

ng. Loose conuid flows.

he reservoir flpe. Check thee proper level

em pressurw. Use a press

ausing extremhe required cop parts.

drift. The reat some pressuan rod end are

m.

nder. Wherevecan feel the c

maintenance pm.

ain functions: ad shoe bearinerature; and scdefects and prs running reli

mp to preven

rom its moun

e system. Addness. Check th

e connections

nnection in th

fluid level muse system on st.

re is too lowsure gauge to

me internal leorrective steps

P

ason for this iure higher thaea), results in

er there is a lecylinder pisto

personnel. Fo

high-pressurngs; lubricatiocavenger pumroduction losiably.

nt seizure. Che

nting and insp

d clean fluid ohe oil temper

s. Tighten sec

he outlet line.

st be above thart up to mak

w. o adjust the re

eakage. Replas after

age | 5

is an the n a

eak or n

r the

re on

mps to s.

eck

pect.

of the rature

urely.

Bleed

he ke

elief

ace

Published S

© Valmet

The pumThe intakoccurs. Dproperly.

The pump

Air leaks listening ffor scorin

Drive for

The coupshafts. All

The pumThe seal i

There is edrained ppressure.

The pumToo muchwith the m

The fluidinlet line a

Notice: Mto a great

The hydThe reservand makecover platinspectingon keepinthe cover

The reservthe oil conthe roll beand inspefrequently

September 12, 20

mp is makike strainer/pirain the syste

p has defectiv

at the pump for a change i

ng at the seals

the pump is

pling is misalilowable misal

mp shaft seis worn or da

excessive presumps. Intern

mp has exch thrust on thmotor shaft. T

temperatureand reservoir

Maintenance oextent on the

draulic unitvoir (Figure 2

es up part of thte, which shoug or refilling.

ng contaminatplate remove

voir for the untained in thee completely dcted for corroy as needed.

014

ng excessiipe is cloggedm, clean the p

ve bearings. R

intake pipe jin sound. Tighand replace a

wrong. Make

igned. Check lignment is .0

eal is leakiamaged. Repla

ssure on the snal drain pum

cessive heahe pump bea

The shaft end

e is too high. temperature

on the hydraue timely attent

t reservoir 2) is usually thhe frameworkuld be kept inThe life of antes out of the

ed.

nit must be lae roll if there idrained. The osion and oth

Mainten

ive noise.d or restrictedpipes and clea

Replace the b

joints or shafhten the jointas necessary.

e sure that the

the bearing o005 inch.

ing. ace the seals.

seals. Check fps should be

at (> 400 °Farings. The pu

gap should b

The pump shs. If the pump

lic system andtion that the f

he largest itemk. The reservo

n place exceptny hydraulic sy

oil. This is ha

arge enough tis a situation reservoir sho

her damage ye

nance Tips - Flui

d. The pump an or replace

earings and in

ft seal. Pour flts and replace

e motor is run

or bushings an

for restrictiondrained to th

F, 205 °C) ump shaft mue 1/8-inch mi

hould be shut p is excessivel

d roll dependfilters receive

m on the unitoir contains at when ystem dependard to do with

to handle all othat requires uld be cleane

early, or more

ds

must receive the strainer. A

nspect the pu

fluid on the pie seals as nece

nning at the c

nd seals. Repl

ns or excessivhe inlet side w

compared ust not be out inimum.

down immedly hot, it shou

d e.

t a

ds h

of

ed e

Figurese

intake fluid fAdd new flui

ump shaft.

ipe joints andessary. Check

correct speed.

lace as necess

ve length of linwith no more t

with the hof line more

diately after culd be overhau

ure 2. Clean andervoir for corrosi

P

freely or cavitd and strain

d shaft seal whthe shaft jour

.

sary and align

ne on externathan 10-psi

hydraulic lithan .005 inc

comparing puuled.

d inspect hydrauion annually.

age | 6

tation

hile rnal

n the

ally

ines. ch

ump,

ulic

Published S

© Valmet

ElevatHydraulicdevelop p

Most hydtemperatuoil. Thesefilters. Whincrease inhours to 1

Some sou

• prco

• w• la• pl• to• le• pl• ai

Oil shouldkeep the o

Case Sand eliThe hydranorthern that the m

The mill cpath forwonly werepress loadwas of thehelped to other presconsidere

A Valmetand relatepress and upgrade n

September 12, 20

ed tempecs are used throblems. One

raulic systemure exceeds 14 deposits can hen this occun oil tempera10,000 hours -

rces of high o

ressure drop ontrol valve, l

worn out pumack of coolinglugged heat eoo many bendeaking cylindelugged filters ir in oil

d be tested peoil clean, cool

Study - Coiminates aulic press loaUSA were du

model they nee

called in Valmward. It was noe the valves ofding control sye same vintageraise the next

ss loading comd for upgrade

engineer exped controls ca

help to deternecessary for t

014

erature trroughout thee such problem

s (except hot 40-160 °F (60get stuck in trs over an ext

ature, oxidatio- an order of m

oil temperatur

that is not peleaking directp

g capacity xchanger

ds in piping er piston seals

eriodically to dl and dry to ge

ontrols upobsolesc

ading valves iue for replacemeded was now

met to help deoted in discusf 1970's vintagystem for thee (Figure 3). t logical questmponents thae?

perienced in pame to the milrmine the scopthe machine's

Mainten

roublesho papermakingm is elevated

oil calenders0-70 °C), oxidthe small orifitended periodon rate doublemagnitude dr

re include:

rforming anytional valve)

s

determine theet the longest

pgrade imcence

n the manifolment. But whw obsolete and

etermine a goossions that noge, but the ente paper machiThat realizatition, were the

at should be

press sections ll to examine pe of the s press loadin

nance Tips - Flui

ooting tipg operation. Toil temperatu

) should run ation and varices of propord, the oil will nes and the serrop in oil lifet

y work (pressu

e condition ooil life possib

mproves p

ld located in then mill storesd no longer av

od t tire ine ion ere

the

ng

Figand

ds

ps They are veryure.

at about 120 °rnishing occurtional valvesneed to be reprvice life of thtime.

ure relief valv

f the oil. The ble.

performan

the basements went to purcvailable. Now

gure 3. The pressd malfunctionin

y reliable but o

°F (50 °C). Wur with resultis, directional vplaced. For ev

hat oil can go

ve, pressure co

goal of hydra

nce and r

t below a papechase new val

w what?

s section at the ng 1970's era co

P

occasionally

When the oil ng deposits invalves and oilvery 18 degrefrom 100,000

ontrol valve, f

aulic systems

reliability

er machine inlves, they fou

mill included obntrols.

age | 7

n the l es

0

flow

is to

y,

n the nd

bsolete

Published S

© Valmet

hydraulicvalves, the

Machine ohydraulic hydraulic

Due to limobtained. loading tosheet breaset point wcapabilitie

The soluAfter furthcompletinand troubthe latest

The mill hscreens ofsystem wa

The mill cup to 4 horeadily donow easy loop contr

Overall, mthe mainthappy ope

Figure 4. (right) pa

September 12, 20

s. The mill me mill would o

operators wercontrol systecontrol syste

mitations of thAlso, during

o the presses, aks. The operawould not remes.

ution – a hher analysis a

ng the upgradbleshooting mcontrol techn

has a new Huffering operatas also installe

changed out aours or more, one and reliabto troubleshorol and the m

mill personneltenance manaerators and m

The original (lefanel.

014

aintenance monly "be doin

re having a nuem. Not only wem was quite o

he existing comachine starthe former stators were formain steady. I

hydraulic coand discussionde, a new customuch easier. Anology and saf

man/Machintors enhanceded for the ma

a sticky propotook less than

ble. Breaks duoot, thus redu

mill has set a p

l are very hapager, the equipmaintenance p

ft) valve panel w

Mainten

manager expreg half the job

umber of probwere the valveobsolete as we

ontrol system,rt-up, when thretcher pressurced to make In addition, th

ontrols upgn with the miom valve rack

All obsolete cofety features.

e Interface cod and simplifinifold supply

ortional valve n 40 minutes

ue to stretcherucing down tim

roduction rec

ppy with the repment is easiepersonnel!

was replaced wi

nance Tips - Flui

essed concern."

blems that coes obsolete (Fell.

, proper and rhe operators hure would decontinuous ahe 1970's era

grade ill, Valmet upk (Figure 4, riomponents ha

ontrol featurinied control of y oil to ensure

after the upg. Nip impress

r unloading hame. Press loadcord after the

esults of the uer to access, o

ith a modern

ds

n that by simp

ould be directlFigure 4, left)

reliable nip imhad the formecrease causin

adjustments tocontrol system

graded the hyight) is in pla

ave been upgr

ng first-out lof the system (Fe a good clean

grade and the sions of the vaave been elimding is now st

e upgrade was

upgrade to thoperate and m

Figure 5.include aand monthe right

ply replacing t

ly linked to th) but the exist

mpressions coer running an

ng instability io the press lom had no tro

ydraulic contrace that makeraded to curre

ogic and user Figure 5). A d

n supply of oil

procedure wharious press n

minated and thteadily runnins installed.

eir press sectimaintain – and

. The new HMI ca comprehensivnitoring screens t.

P

the hydraulic

he 1970's era pting original

ould not be nd then appliein the system adings becauubleshooting

rol system. Aes maintenancent models wi

friendly contduplex filter l.

hich used to tnips are now he entire systeng with close

ion. Accordind that makes f

control panels (lve set of machine

such as that sh

age | 8

press

ed and se the

g

fter ce ith

trol

take

em is d

ng to for

left) e control own on

Published S

© Valmet

HydrauThe followlisted for eassociated

AbnormSource/S

Pump

Motor

Mechanivibration

Relief va

September 12, 20

ulic Troubwing troubleseach type of t

d cause.

mal/ExcessSymptom

ical ns

alve

014

bleshootihooting guid

trouble. Cause

ive Noise Possible P

• Cavita

• Air in

• Coupl

• Pump • Coupl

loose • Motor • Misali

• Vibrat

• Impro

• Valve

Mainten

ing Chartes cover five ces are listed in

Problem

ation

n fluid

ling

p worn or dam

ling misaligne

r worn or dam

igned, loose c

tion of pipes

oper setting

worn or dam

nance Tips - Flui

ts categories of tn order of pro

R

••••

••••

••

maged •

ed or ••

maged •

coupling •

•

•

maged •

ds

trouble. Possiobability; rem

Recommende

Replace di Clean clog Clean rese Change to

speed.

Tighten le Fill reserv Bleed air f Replace pu

Tighten co Check con

Repair or

Re-align c Check con

Repair or

Re-align cunnecessa

Tighten piclamps wh

Install precorrect valsetting is npressure o

Repair or

ible causes anmedies are liste

d Action

irty strainers.gged inlet lineervoir breatheo proper pum

eaky inlet convoir to proper from system. ump shaft sea

oupling. ndition of sea

replace.

coupling. ndition.

replace.

coupling and rary clearancesipe clamps anhere necessary

essure gauge alve setting prnot too close tor to another v

replace.

P

nd remedies aed adjacent to

e. er vent. p drive moto

nnection. level.

al.

als and bearing

remove any s. nd add more y.

and adjust to essure. Make to operating valve setting.

age | 9

are o the

r

gs.

sure

Published S

© Valmet

ExcessivSource/S

Pump Relief

Flow lospressuresides Insuffici

Tank He

Viscosity

IncorrecSource/S

No flow

September 12, 20

ve Heat Symptom

ses between and return

ent cooling

eater

y too low

ct Flow Symptom

014

Possible P

• Pump • Incorr

• Pressu• Defec

damag • Coolin

unava• Depos

system • Heate

• Oil da• Water • Impro

Possible P

• Pump

• Pump • Pump

• Pump

incorr

Mainten

Problem

p worn or dam

rect setting

ure set improptive valve funged seals

ng water systeailable sits in cooling

m

er on too muc

amaged r contaminati

oper oil

Problem

p not receiving

p motor not o

p-to-drive

p motor rotatirect

nance Tips - Flui

R

maged •

•

perly •nction or •

em •

g water •

ch ••

ion ••

•

R

g fluid •••

perating •

••

ion •

ds

Recommende

Repair or

Install precorrect set

Set pressu Repair or

Make cool

Clean cooequipmen

Check pro Check disc

Drain and Find and r

and refill w Drain and

Recommende

Replace di Clean clog Clean rese

Repair or

Check for Replace an

Reverse ro

d Action

replace.

essure gauge atting pressure

ure to the diagreplace.

ling water ava

oling water strnt.

ogram for proconnect for p

d refill with frerepair water swith fresh oil

d refill with fre

d Action

irty strainers.gged inlet lineervoir breathe

replace.

damaged pumnd align shear

otation.

Pag

and adjust to e.

gram rating.

ailable.

rainer and

oper commanproper operati

esh oil source then d. esh oil.

e. er vent.

mp or drive.red coupling.

ge | 10

nd. ion.

rain

Published S

© Valmet

Incorrec

Source/S

Low flow

Excess fl

Flow lospressuresides

September 12, 20

ct Flow (cont.

Symptom

w

low

ses between and return

014

):

Possible P

• Directpositio

• Entire • Dama

• Flow c • Relief

valve s • Variab

mecha • Flow c • Maxim

high • Pressu

due topartic

• Cylind

seal da • Seal d

incom

Mainten

Problem

tional valve inon

e flow passing

aged pump

control set to

f valve or unloset too low

ble displacemanism malfun

control set to

mum pressure

ure valve canno dirt or foreigles

der tube, pistoamaged

damaged due tmpatible mate

nance Tips - Flui

R

n wrong •

•

g •

••

o low •

oading •

ment nctioning

••

o high •

e set too •

not close gn

••

on, or •

to rials

•

ds

Recommende

Check posvalves.

Check elecoperated v

Adjust rel

Check for Replace an

Adjust.

Adjust.

Check pum Repair or

Adjust.

Re-adjust

Clean syst Repair or

Repair or

Replace sethe hydrau

d Action

sition of man

ctrical circuitvalves.

ief valve over

damaged pumnd align coup

mp compensareplace.

pressure setti

tem. replace parts.

replace dama

eals that fit thulic fluids to f

Pag

ually-operate

t for solenoid-

r relief valve s

mp or drive.pling.

ator.

ing per diagra

.

aged part.

e system or chfit the seals.

ge | 11

ed

-

etting.

am.

hange

Published S

© Valmet

IncorrecSource/S

No press

Low Pre

September 12, 20

ct PressureSymptom

sure

ssure

014

e Possible P

• Dirty

• Pump • Pump

sheare • Pump

incorr • Direct

positio

• Entire

relief v • Dama

• Reduc • Reduc

damag • Relief

valve s • Variab

mecha • Pump

cylindcompo

• Water

Mainten

Problem

pump straine

p motor not o

p-to-drive coued

p motor rotatirect

tional valve inon

e flow passingvalves

aged pump

cing valve set

cing valve woged

f valve or unloset too low

ble displacemanism malfun

p, valve, motoder, or other onent worn/d

r contaminati

nance Tips - Flui

R

ers ••

perating •

upling •

ion •

n wrong •

•

g over •

••

too low •

rn or •

oading •

ment nctioning

••

r,

damaged

•

ion •

ds

Recommende

Replace. Clean clog

Repair or

Replace an

Reverse ro

Check posvalves.

Check elecoperated v

Adjust rel

Check for Replace an

Adjust.

Repair or

Adjust.

Check pum Repair or

Repair or

Drain, flus

d Action

gged inlet line

replace.

nd align coup

otation.

sition of man

ctrical circuitvalves.

ief valve settin

damaged pumnd align coup

replace.

mp compensareplace.

replace.

sh and refill.

Pag

e.

pling.

ually-operate

t for solenoid-

ng.

mp or drive.pling.

ator.

ge | 12

ed

-

Published S

© Valmet

Incorrec

Source/S

Erratic

Excess p

Faulty O

Source/S

No move

Slow mo

September 12, 20

ct Pressure (co

Symptom

ressure

Operation Symptom

ement

ovement

014

ont.):

Possible P

• Air in

• Reduc

unload • Variab

mecha

Possible P

• No pr

• Limit

deviceimpro

• Mecha

operat • Cylind • Low fl

• Fluid

• Insuff

• Lack o • Cylind

Mainten

Problem

n fluid

cing valve or ding valve set

ble displacemanism

Problem

ressure or flow

device / seque inoperative operly set.

anical bind nting

der or motor

flow

viscosity too

ficient pressur

of lubricant

der or motor

nance Tips - Flui

R

•••

t too high •

ment ••

R

w •

uence or

•

•

ot •

damaged •

•

high •••

re •

•

damaged •

ds

Recommende

Tighten le Fill reserv Bleed air f

Adjust.

Check pum Repair or

Recommende

See troublflow and i

Check mehydraulic

Adjust, rep

Locate and

Repair or

See troublflow.

Fluid may Check hea Change to

See troublpressure.

Lubricate

Repair or

d Action

eaky connectivoir to proper from system.

mp compensareplace malfu

d Action

leshooting guincorrect pre

echanical, eleclimits and seqpair, or replac

d repair bind.

replace.

leshooting gu

y be too cold oating/cooling o clean fluid o

leshooting gu

machine way

replace.

Pag

ons. level.

ator. unctioning un

uides for incoressure.

ctrical and/or quence devicece.

.

uide for incorr

or dirty. system.

of correct visc

uide for incorr

ys or linkage.

ge | 13

nit.

rrect

es.

rect

cosity.

rect

Published S

© Valmet

Faulty O

Source/S

Erratic m

FoaminSource/S

Tank Suction Impropedegraded

DirectioSource/S

Coil not

Valve sp

September 12, 20

Operation (con

Symptom

movements

g Oil Symptom

line

er or d oil

onal ControSymptom

picking up

ool stuck

014

nt.):

Possible P

• Errati

• Air in • Impro

Possible P

• Oil lev • Crack

line • Inade

agent

ol Valve PoPossible P

• Electr

• Impur

and bo

• Throt

betwevalve osoleno

Mainten

Problem

c flow

n oil

oper pressure

Problem

vel in tank too

ked or leaking

quate anti-fo

osition notProblem

ric failure

rities betweenore

ttle set too tigheen the main aof the two coioid valve

nance Tips - Flui

R

•

•

•

R

o low •

g suction •

aming •

t ChangingR

•

n spool •

ht and pilot il

•

ds

Recommende

See troublflow.

See troubl

See troublpressure.

Recommende

• Add oil as

• Repair or

• Replace w

Recommende

Fix electrispool mot

Replace va

Set the thr

d Action

leshooting gu

leshooting gu

leshooting gu

d Action

s required.

replace.

with proper oil

d Action

c failure and tion.

alve if necessa

rottle at the co

Pag

uide for incorr

uide for air in

uide for incorr

l.

check mecha

ary.

orrect rating

ge | 14

rect

oil.

rect

nical

Published S

© Valmet

Directio

Source/S

Proportinot respo

ComputComputertable lists

ALARM M

Pressure F Pressure F CirculatioCirculatio Return Fil Hydraulic

HydraulicHydraulic

Pump Fauby pump)

September 12, 20

nal Control V

Symptom

ional valve onding

ter Alarm Mrized control some recomm

MESSAGE

Filter Blocked

Filter Blocked

n/Filter Pumn/Filter Pum

lter Blocked

c Unit Temper

c Oil Level Lowc Oil Level Low

ult MCC or St

014

Valve Position

Possible P

• Valve value

• Set va

not re

Messages systems usua

mended actio

d (identified by

d for Circulati

p Fault MCCp Stopped &

rature High

w w - Pumps St

tandby Pump

Mainten

n Not Changi

Problem

not receivingfrom program

alue received besponding

ally have alarmns to take to r

y pump)

on Pump

C Main Pumps

topping

Fault MCC (

nance Tips - Flui

ing (cont.):

R

g set m

•

but valve •

m screens whiresolve comm

R

•

•

Running •

•

••••

•

(identified •

ds

Recommende

Locate and

Replace th

ich record alamon hydraulic

RECOMMEN

• Replace o

• Replace o

• Motor ouif that pum

• Replace o

• Check coo• Check the• Check wa• Check tha

valves wercorrect th

• Determinoil level. Astop automthe shutdo

• Motor ouif that pum

d Action

d fix electric f

he proportion

arm messagesc alarms.

NDED ACTIO

old filter with

old filter with

utput gives alamp is not run

old filter with

oling pump oe cooler waterater thermostaat none of there set too low

he setting.

ne what is cauAdd clean oil.matically if thown level.

utput gives alamp is not run

Pag

failure.

nal valve.

s. The followin

ON

new filter ins

new filter ins

arm to contronning.

new filter ins

operation. r strainer. at operation.e pressure reli

w. If required,

sing the drop. The pumps whe level drops

arm to contronning.

ge | 15

ng

sert.

sert.

ol desk

sert.

ief

p in will

s to

ol desk

Published S

© Valmet

PneumThe followintended the followoperation

ActuatoSource/S

Excessiv

Pressure

September 12, 20

matic trouwing charts coas a starting p

wing situationn after checkin

or Moving ASymptom

ve air choke

e too low

014

ubleshootover commonpoint for trous exists, work

ng each sourc

AbnormallPossible P

• Flow cincorr

• Plugg • Air lea • Plugg • Dama • Dama

adjustvalve

• Plugg • System • Direct

open dpilot c

• Cylind

seal da

Mainten

ting Charn problems wubleshooting sk through the e before tryin

y Slow Problem

control valve rectly adjusted

ed air silencer

ak or squeeze

ed filter

aged cylinder

aged or incorrted pressure r

ed filter

m leaks

tional or othedue to dirt orcircuit

der pipe, pistoamaged

nance Tips - Flui

rts ith the actuat

since it is impsource and re

ng another sou

R

d •

r •

ed tube •

•

or seal •

rectly regulator

•

•

•

er valve r failed

•

on, or •

ds

tor or pneumapossible to incemedy lists asurce.

Recommende

Readjust t

Replace or

Repair air

Replace ai

Replace cy

Replace reshown in d

Replace fil

Fix leaks.

Locate damit.

Repair or

atic valves. Thclude all possis possible cau

d Action

the valve.

r clean silence

leak or tube.

ir filter.

ylinder or sea

egulator or redrawing.

lter.

maged part an

renew damag

Pag

hese charts aribilities. If one

uses. Re-check

er.

al.

adjust rating

nd clean or re

ged parts.

ge | 16

re e of

k

as

eplace

Published S

© Valmet

Filter/RSource/S

Air leak

Pressure

Filter Pro

DirectioSource/S

Coil not

Valve sp

September 12, 20

Regulator/Symptom

at regulator

e problems

oblems

onal ControSymptom

picking up

ool stuck

014

LubricatorDiscussion

A continuleaky mainregulator sare availab IMPORTA• Replac

complpneumthems

If the diapwill occur Clean or relement w Drain conair turbulepneumaticdrain. Use filter eother smo

ol Valve noPossible P

• Electr

• Impur

and sl • Valve

Mainten

r Unit n/Recommen

uous air leak fn bonnet or dshould be schble for most s

ANT: ce diaphragmlete failure of

matic system.selves, creatin

phragm is crac. Replace the

replace the filtwill create a pr

ndensate fromence may pickc system. If co

elements withooth surfaces f

ot ChangingProblem

ric failure

rities betweenleeve

pilot not wor

nance Tips - Flui

nded Action

from the smaldiaphragm. Reheduled for retandard regu

m or seals as sof the diaphrag

This may caung a safety haz

cked or brokediaphragm.

ter element reressure drop w

m the filter bowk up the wateondensate req

h the approprfrom harmful

g PositionR

•

n spool •

rking •

ds

ll vent hole inepair parts shepair. Overhauulators.

oon as possibgm might appuse some solezard to person

en, a high velo

egularly. Whewhich may af

wl before it rier and carry itquires frequen

riate rating tol contaminan

Recommende

Fix electrispool mov

Replace va

Replace or

n the regulatorhould be ordeul kits with d

ble after the leply full house enoid valves tonnel and equi

ocity air leak

en over-contaffect system op

ises above thet downstreamnt draining, in

o protect cylinnts.

d Action

c failure and vement.

alve.

r clean pilotin

Pag

r bonnet indired at once an

diaphragm and

ak is discoverpressure to tho shift by ipment.

at the vent ho

aminated, theperation.

e baffle. Otherm into the

nstall an auto

nder barrels an

check mecha

ng part.

ge | 17

icates a nd the d seals

red. A he

ole

e filter

rwise,

omatic

nd

nical

Published S

© Valmet

Directio

Source/S

Proportinot respo

Air ValvSource/S

Low volt

Voltage t

AC hum

Valve sp

September 12, 20

nal Control V

Symptom

ional valve onding

ves Symptom

tage problems

transients

m

ool stuck

014

Valve not Cha

Possible P

• Valve value

• Set va

not re

Discussion

s Applying high inrusmagnetic fhigh resistpowers th Solenoid binsulationwhere soleinductive peaks thatthe solenopractices. If the solenenergized,seating. If moving pa Extremelythis case, r The armatsolenoid w A metal-tothe spool (

Mainten

anging Positio

Problem

not receivingfrom program

alue received besponding

n/Recommen

low voltage tosh current conforce to seat ttance connecte circuit.

burnout may n, causing shoenoids are conloads. Switch

t will be seen boid circuits. UElectrical filte

noid noise lev, operate the m

f the noise decarts and check

y loud AC humreplace the so

ture may be hwill draw high

o-metal spool(and the solen

nance Tips - Flui

on (cont.):

R

g set m

•

but valve •

nded Action

o an AC solenntinuously anthe armature tions; and low

be caused by rt circuits to gnnected to vo

hing such loadby all compon

Use 120 V coner networks m

vel is very higmanual overrcreases, it indk for correct v

m can be causolenoid.

held unseatedh inrush curre

l-type valve mnoid armatur

ds

Recommende

Locate and

Replace th

noid valve wilnd burn out, bof the valve. C

w voltage on t

high transienground. This

oltage sourcesds on and off nents in the c

ntrol circuits amay also be us

gh and occursride to check t

dicates incompvoltage suppl

sed by a brok

d because a valent for too lon

may be varnishre) from shifti

d Action

d fix electric f

he proportion

ll cause the sobecause there Causes of lowthe control tra

nt voltages thaproblem is m

s that supply mcan cause ver

circuit. The reand observe gsed.

s each time thto see that theplete solenoidly.

ken part within

lve spool wonng a time and

hed in place, ing. Repair or

Pag

failure.

nal valve.

olenoid coil towon't be eno

w voltage incluansformer tha

at break downmost commonmotors and ory high voltagemedy is to isgood groundin

he solenoid is e armature is d motion. Cle

n the solenoid

n't shift. The d burn out.

or dirt may pr replace.

ge | 18

o draw ough ude at

n coil n ther

ge olate ng

an all

d. In

prevent

Published S

© Valmet

Air Valv

Source/S

Temperaproblem

Air CylinSource/S

Drift

No move

Erratic m

September 12, 20

ves (cont.):

Symptom

ature ms

nders Symptom

ement

movement

014

Discussion

Solenoid ftemperatuturns of thor using a

Discussion

Piston seathe seal, pside. Virtuseals as ne Other circdirectionaleaks as ne • Pressu

• Piston

• Scored

• Load m • Large

static

Mainten

n/Recommen

failure can be ure. Insulationhe coil. If amb

pilot-actuate

n/Recommen

al leaks can caressurize one

ually no air sheeded.

cuit leaks can al control valveeded.

ure too low

n seal leak

d cylinder bor

misalignment

difference beand dynamic

nance Tips - Flui

nded Action

expected whn may fail, caubient temperaed valve with a

nded Action

ause a cylindere side of the pihould leak pas

cause a cylindve (internally

•

•

•

•

re •

•

t •

etween c friction

•

ds

en a valve is ousing shorts tatures are too a remote pilo

r to drift fromiston and obsst pistons equ

der to drift. Cand externall

Check presmeets circu

Operate val

Observe fluend of cylin

Replace pis

Replace nec

Eliminate c

Re-align cy

Install flowpressure to

operated abovto ground or high, conside

ot valve.

m its normal pserve leakage uipped with so

Check for leakly) and in con

ssure at cylinduit requiremen

lve to cycle cy

uid flow at valnder stroke.

ston seals if flo

cessary parts.

contaminants

ylinder and lo

w control valveo control strok

Pag

ve its rated shorts betweeer moving the

position. To cfrom the oppoft seals. Repl

ks through thennecting lines

der to make sunts.

ylinder.

lve exhaust po

ow is excessiv

.

s from air sup

oad.

es to provide ke.

ge | 19

en e valve

check posite lace

e s. Fix

ure it

orts at

ve.

pply.

back

Published S

© Valmet

Air Cylin

Source/S

Cylinderleak

Rod glan

September 12, 20

nders (cont.):

Symptom

r body seal

nd seal leak

014

:

Discussion

• Loose

• Excess • Pinch • Seal d

gumm • Seal d

brittletempe

• Seal d • Torn o

• Pinch • Seal d

gumm

• Seal d

brittletempe

• Seal d

Mainten

n/Recommen

e tie rod

sive pressure

ed or extrude

deterioration-smy

deterioration-he. Usually dueerature extrem

deterioration-w

or worn seal

ed or extrude

deterioration-smy

deterioration-he. Usually dueerature extrem

deterioration-w

nance Tips - Flui

nded Action

•

•

ed seal •

soft, •

hard, e to mes.

•

wear •

•

•

ed seal •

soft, •

•

hard, e to mes.

•

wear •

ds

Repair or r

Repair or r

Repair or r

Repair or r

Repair or r

Repair or r

Examine piscore markCheck glanreplace.

Replace gla

Check com

Replace wit

Replace seatemperatur

Replace sea

eplace.

eplace.

eplace.

eplace.

eplace.

eplace.

iston rod for ks. Repair or rnd bearing for

and seal.

mpatibility of s

th new seals.

als and shield re extremes.

als.

Pag

dents, gougesreplace. r wear. Repair

seals with lub

cylinder from

ge | 20

s or

r or

ricant.

m

Published S

© Valmet

Air Cylin

Source/S

Contamicircuit

This white technical m

Valmet proand power fabrics. Ouservices.

We are com

September 12, 20

nders (cont.):

Symptom

ination in

paper combinemanuals and pa

ovides competitr professionals ur offering and e

mmitted to mov

014

:

Discussion

• Sealinfitting

• Impro

pipes • Burrs

compo

• Seals e

excess

• Gener

circuit

es technical infapers.

tive technologiespecialize in prexperience cov

ving our custom

Mainten

n/Recommen

ng compound gs

operly filtered

inside pipingonents

extruding frosive pressure

rally excessivet

formation obtai

es and servicerocesses, macver the entire p

mers' performa

nance Tips - Flui

nded Action

inside •••

d feed •

g •

•

m •

•

e dirt in •

ined from Valm

s to the pulp, echinery, equipmprocess life cyc

nce forward.

ds

Protect fittiFollow proDisconnectattempt to aggressive a

Evaluate cirpre-filters.

Componenduring repaDisconnectremove burlines with a

Troubleshoand make cRe-set sealsre-seal.

Wipers or bwhere needconsider adcylinders.

met personnel a

energy and papment, services, cle including ne

ings during stper sealing prt cylinder fromclear debris frair blast.

rcuit design, c

nts and/or pipairs and/or stt cylinder fromrrs. Clear remaggressive air

oot cause for echanges to pres if possible, o

boots were noded. Evaluate dding wipers

and published V

per industries. paper machine

ew production li

Pag

torage. rocedures. m circuit andfrom lines by

consider addi

ping not proteorage. m pipes and

maining debrisblast.

excessive presevent.

otherwise clea

ot used on cylcircuit designor boots to

Valmet articles

Valmet's pulp, e clothing and lines, rebuilds a

ge | 21

d

ing

ected

s from

ssure

an and

linders n,

,

paper filter and