EXPLANATORY NOTES
A8 www.nord.com
AGMA GEARMOTOR LOAD CLASSIFICATIONS
The AGMA rated parallel (helical) gearmotors in the catalog are grouped by Service Classes I, II or III.
Class I : (Minimum 0.8 Service Factor)A gearmotor can operate with steady loads not exceeding the normal rating and 8 - 10 hoursof running time per day.
Class II : (Minimum 1.4 Service Factor)
a) A gearmotor can operate with steady loads not exceeding the normal rating and 24 hoursof running time per day.
or
b) A gearmotor can operate with moderate shock loads not exceeding 1.25 x rated load torqueand 8 - 10 hours of running time per day.
Class III : (Minimum 2.0 Service Factor)
a) A gearmotor can operate with moderate shock loads which are a maximum 1.25 x rated load torqueand 24 hours of running time per day.
b) A gearmotor can operate with heavy shock loads in excess 1.25 x rated load torqueand 8 - 10 hours of running time per day.
The Nord Gear units in the catalog grouped by AGMA service classes are applied per AGMA service factorlistings as shown by 6010 - E88 and 6034 - A87.
The high-speed gearing is finish ground to reduce noise levels to a minimum. The low-speed gears are skived perthe latest finishing technology. In many cases the quality levels of the gearing exceeds AGMA quality levels 11-13.
AGMA GEAR REDUCER LOAD CLASSIFICATIONS
This chart is a guideline for the types of loads applied to the following:
Parallel (helical) reducersHelical-Worm gearmotors and reducersHelical-Bevel gearmotors and reducers
SERVICE IN HOURS/ DAY
LOAD CLASSIFICATION OF THE MACHINERY DESIGN WHEN FREQUENT STOPS / STARTS ARE APPLIEDIN EXCESS OF 10 / HOUR
UNIFORM MODERATE SHOCK HEAVY SHOCK UNIFORM MODERATE SHOCK HEAVY SHOCK
1/2 hours or less 0.8 0.8 1.0 0.8 1.0 1.25
2 hours intermittently 1.0 1.0 1.25 1.0 1.25 1.5
10 hours 1.0 1.25 1.5 1.25 1.5 1.7524 hours 1.25 1.5 1.75 1.5 1.75 2.0
AGMA GEAR MOTOR LOAD CLASSIFICATION
www.nord.com A9
APPLICATIONCLASS OF SERVICE
APPLICATIONCLASS OF SERVICE
APPLICATIONCLASS OF SERVICE
3-10HRS/DAY
10-24HRS/DAY
3-10HRS/DAY
10-24HRS/DAY
3-10HRS/DAY
10-24HRS/DAY
AGITATORSPure LiquidsLiquids & SolidsLiquids —
Variable DensitySemi-Liquids —
Variable DensityBLOWERS
CentrifugalLobeVane
BREWING & DISTILLINGBottling MachineryBrew Kettles —
Continuous DutyCookers —
Continuous DutyMash Tubs
Continuous DutyScale Hopper
Frequent startsCAN FILLING MACHINESCANE KNIVESCAR DUMPERSCAR PULLERS —
Intermittent dutyCLARIFIERSCLASSIFIERSCLAY WORKINGMACHINERY
Brick PressBriquette MachineClay working
machineryPug Mill
COMPRESSORSCentrifugalLobeReciprocating
Multi-cylinderSingle Cylinder
CONVEYORS—UNIFORMLY LOADEDOR FED
ApronAssemblyBeltBucketChainFlightOvenScrew
CONVEYORS—HEAVY DUTY NOTUNIFORMLY FEDApronAssemblyBelt
III
II
II
IIII
I
—
—
—
IIIIIIII
IIII
IIIIIIIIII
III
IIIII
IIIIIIII
IIIIII
IIII
II
II*
IIIIII
II
II
II
II
IIIIII
—
—IIII
III*III*IIII
IIII
II*III*
IIIIIIIIIIIIIIII
IIIIII
BucketChainFlightLive Roll (package)OvenReciprocatingScrewShaker
CRANES & HOISTSMain Hoists
Heavy DutyMedium Duty
ReversingSkip HoistsTrolley DriveBridge Drive
CRUSHERSOreStone
DREDGESCable ReelsConveyorsCutter Head DrivesJig DrivesManeuvering WinchesPumpsScreen DriveStackersUtility Winches
ELEVATORSBucket-Uniform LoadBucket-Heavy LoadBucket-ContinuousCentrifugal DischargeEscalatorsFreightGravity DischargeMan LiftsPassengersService-Hand Lift
FANSCentrifugalCooling Towers
Induced DraftForced DraftInduced DraftLarge (Mine, etc.)Large IndustrialLight (Small Diameter)
FEEDERSApronBeltDiscReciprocatingScrew
FOOD INDUSTRYBeet Slicer
IIIIIIIIIIIIIIIII
IIIIIIIIIIIII
IIIIII
IIIIIIIIIIIIIIIIIIIII
IIIIIIIII**
III
II
II*IIIIIII
IIIII
IIIII
II
IIIIIIIIII
III*II
III*
III*IIIIII
II*II*
III*III*
—II
III*III*—II
III*II
—
IIIIIIIIIIIIII**
—
II
II*II
II*II*II
IIIIII
III*II
II
Cereal CookerDough MixerMeat Grinders
GENERATORS —(Not Welding)
HAMMER MILLSLAUNDRY WASHERS
ReversingLAUNDRY TUMBLERSLINE SHAFTS
Heavy Shock LoadModerate Shock LoadUniform Load
LUMBER INDUSTRYBarkers —
Spindle FeedBarkers-Main DriveCarriage DriveConveyors-BurnerConveyors-Main orHeavy DutyConveyors-Main LogConveyors —
Merry-go-RoundConveyors-SlabConveyors-TransferConveyors-WasteChains-FloorChains-GreenCut-Off Saws-ChainCut-Off Saws-DragDebarking DrumsFeeds-EdgerFeeds-GangFeed-TrimmerLog DeckLog Hauls-Well TypeLog Turning DevicesPlaner FeedPlaner Tilting HoistRolls-Live-Off
Brg.-Roll CasesSorting TableTipple HoistTransfers-ChainTransfers-CranewayTray DrivesVeneer Lathe Drives
MACHINE TOOLSBending RollNotching Press —
Belt DrivenPlate PlanerPunch Press —
Gear DrivenTapping Machines
IIIII
IIII
IIII
IIIIII
IIIII*II
IIIII
IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII
IIIIIIIIIIIII*
II
*III
IIIIII
IIIIII
IIIII*
IIII
III*IIII
IIIIII**
III
IIIIII*IIIIII*III*IIIIIIIIIIIIIIIIIIII*IIIIII*IIIIII*III*III*IIIIII
III*IIIIIIIIIIIIIII*
II
*III*
IIIIII*
* Refer to factoryApplications requiring frequent stops and starts, high inertia loads or oversized brakes or clutches (exceeding motor full load torque) should be referred toNORD GEAR for rewiew.
AGMA GEAR MOTOR LOAD CLASSIFICATION
A10 www.nord.com
APPLICATIONCLASS OF SERVICE
APPLICATIONCLASS OF SERVICE
APPLICATIONCLASS OF SERVICE
3-10HRS/DAY
10-24HRS/DAY
3-10HRS/DAY
10-24HRS/DAY
3-10HRS/DAY
10-24HRS/DAY
Other Machine ToolsMain DrivesAuxillary Drives
METAL MILLSBridle Roll DrivesDraw Bench-CarriageDraw Bench —
Main DriveForming MachinesPinch Dryer &
Scrubber Rolls,ReversingSlittersTable Conveyors
Non-ReversingReversing
Winding Reels-StripWire Drawing &
Flattening MachineWire Winding
MachineMILLS, ROTARY TYPE
BallCement KilnsDryers & CoolersKilnsPebbleRodTumbling Barrels
MIXERConcrete Mixers,
ContinousConcrete Mixers,
IntermittentConstant DensityVariable Density
OIL INDUSTRYChillersOil Well PumpingParafin Filter Press
Rotary KilnsPAPER MILLS
AeratorsAgitators (Mixers)Barker Auxilliaries,HydraulicBarker, MechanicalBarking DrumBeater & PulperBleacherCalendersCalenders-SuperConverting Machines,
except Cutters,Platters
III
IIIIII
IIIIII
*II
II——
II
II
III*IIIIIIIIIIIII
II
IIII
II*IIII
*II
———————
—
IIII
III*III*
III*III*
*II
IIIIIIIII
III
II
III**IIII
III*III*III*
II
—IIII
II*IIII
*II
IIIIII
III*II*II
II*II
II
ConveyorsConveyors, LogCouchCutters, PlatersCylindersDryersFelt StretcherFelt WhipperJordansPressesPulp Machines, ReelStock ChestsSuction Roll
Washer & ThickenersWinders
PRINTING PRESSESPULLERS
Barge HaulPUMPS
CentrifugalProportioningReciprocatingSingle Acting 3 or
More CylindersDouble Acting 2 or
More CylindersSingle Acting 1 or
2 CylindersDouble Acting
Single ActingRotary — Gear Type
— Lobe, VaneRUBBER INDUSTRY
MixerRubber CalenderRubber Mill(2 or more)SheeterTire Building MachinesTire & Tube
Press OpenersTubers & Strainers
SEWAGE DISPOSALEQUIPMENT
AeratorsBar ScreensChemical FeedersCollectors, Circuline
or StraightlineDewatering ScreensGrit CollectorsScum BreakersSlow or Rapid MixersSludge CollectorsThickeners
———————————————I
III
III
II
II
*
*II
IIIII
IIII*
*II
*II
IIIIIIIIIII
IIIII*II*III*II
II*II
III*II
II*IIII
II*II*IIII
III*
IIII*
II
II
*
*IIII
III*II*
II*II**
*II
**IIII
IIIIIIIIIIIIII
Vacuum FiltersSCREEN
Air WashingRotary —
Stone or GravelTraveling Water
IntakeSLAB PUSHERSSTEERING GEARSTOKERSTEXTILE INDUSTRY
BatchersCalendersCard MachinesCloth Finishing
Machines,(Washer, pads,tenters)
(Dryers, Calenders,etc.)
Dry CansDryersDyeing MachineryKnitting Machines
(looms, etc.)LoomsManglesNappersPadsRange DrivesSlashersSoapersSpinnersTenter FramesWasherWinders (other than
(Batchers)Yarn Preparatory
Machines (Cards,Spinners, Slashers,etc.)
WINDLASS
II
I
II
IIIIII
IIIIII
IIIIIIII
*IIIIIIII*IIIIIIIIIIII
IIII
II
II
II
IIIIIIII
IIIIII*
IIIIIIII
*IIIIIIII*IIIIIIIIIIII
IIII*
* Refer to factoryApplications requiring frequent stops and starts, high inertia loads or oversized brakes or clutches (exceeding motor full load torque) should be referred toNORD GEAR for review.
AGMA GEAR REDUCER LOAD CLASSIFICATION
www.nord.com A11
APPLICATIONSERVICEFACTOR APPLICATION
SERVICEFACTOR APPLICATION
SERVICEFACTOR
8 to 10hour
Service
24hours
Service
8 to 10hours
service
24hours
Service
8 to 10hours
Service
24hours
ServiceNORMAL INDUSTRIALUSAGESteady load not exceedingnormal rating of motor orintermittent shockModerate shockHeavy shock
AGITATORSPure LiquidVariable density
BLOWERSCentrifugalLobe
BREWING AND DISTILLINGBottling machineryBrew kettles, continous dutyCookers, continous dutyMash tubs, continous dutyScale hooper (frequentstarting)
CAR DUMPERS
CAR PULLERS
CLARIFIERS
CLASSIFIERS
CLAY WORKINGMACHINERYBrick pressBriquette machineClay working machineryPug mill
COMPRESSORSCentrifugalLobeReciprocating multi-cylinders(within 3% cyclic variation)Reciprocating, single cylinder
CONVEYORS(Uniformly loaded or fed)
Flight, Oven, Screw
CONVEYORS(Heavy duty or dual drive notuniformly fed)Apron, Assembly, BeltBucket, FlightOven, ScrewReciprocating, Shaker
CRANES & HOISTSMain hoists - medium duty
- heavy dutySkip hoistsTravel motionTrolley motion
1.001.251.75
1.001.25
1.001.25
1.001.001.001.001.25
1.75
1.25
1.00
1.25
1.751.751.251.25
1.001.25
1.25Refer to
1.00
1.251.251.251.75
1.251.75
Referto
factory
1.251.50
Refer tofactory
1.251.50
1.251.50
1.251.251.251.251.50
1.75
1.50
1.25
1.50
1.751.751.501.50
1.251.50
1.50factory
1.25
1.501.501.501.75
1.501.75Refer
tofactory
DREDGESCable reels, ConveyorsCutter head drivesJig drive, Screen driveStackersUtility winches
ELEVATORS(Conveyor type - same asconveyors)
FANSCentrifugalCooling towersLarge (mine, etc.)Light small diameter
FOOD INDUSTRYBeet slicerCereal cookersDough mixerMeat grinder
HOISTS - See Cranes
LAUNDRY WASHERS
LAUNDRY TUMBLERS
MACHINE TOOLSPunch press ( gearconnected to toad)Notching press (belt driven)Plate planersOther machine tools maindrivesAuxiliary drives (FeedTraverse, etc.)
METALL MILLSDraw bench carriage andmain drivesForming machinesPinch, dryer and scrubberrolls (reversing)SlittersSmall rolling mill, drivesTable conveyors (nonreverse)Table conveyors (reversing)Wire drawing and flatteningmachines
MILLS (ROTARY TYPE)Ball, dryer coolerCement kilns, pebble rodKilnsTumbling barrels
MIXERSConcrete mixers - continousConcrete mixers - intermittentConstant densityVariable density
1.251.751.751.251.25
Refer toFactory
1.00Ref.to1.251.00
1.251.001.251.25
1.25
1.25
1.75Refer to
1.751.25
1.00
1.00
1.75Refer to
1.251.75
1.25Refer to
1.25
——
1.251.75
1.251.001.001.25
1.501.751.751.501.50
Refer toFactory
1.25Factory
1.501.25
1.501.251.501.50
1.50
1.50
1.75Factory
1.751.50
1.25
1.25
1.75Factory
1.501.75
1.50Factory
1.50
1.501.501.501.75
1.50—
1.251.50
LINE SHAFTSDriving processing equipmentOther line shafts
PAPER MILLBleacher pressesConveyors, suction rollWindersAgitators (mixers)Dryer, felt stretcherStock chest calendersBeater & pulperJordansCouch, cylinders
RUBBER INDUSTRYMixerRubber calenderRubber millTire building machinesTire and tube press openersTubers or strainers
PUMPSCentrifugalGear and rotary - constant densityfluidGear and rotary - variable densityfluidProportioning pumpsReciprocating with open dischargeReciprocating - multicylinder,double actingReciprocating - single cylinderReversing duty
SEWAGE DISPOSALEQUIPMENTInside service
SCREENSRotary - stone or gravelTraveling water intake
OIL INDUSTRYOil well pumping ( not over 150%peak torque)RefineriesChillers, rotary kilnParaffin filter press
TEXTILE INDUSTRYBatchers, calendersCard machine, dry cansDyeing machinery, manglesNappers, soapersSpinner, tenter frames
1.251.00
1.001.001.001.251.251.251.251.251.25
——
1.75Refer toFactory
—
1.001.00
2.00
1.251.00
1.25Refer toFactory
1.00
1.251.00
1.751.251.251.25
1.251.251.251.251.25
1.501.25
1.251.251.251.501.501.501.501.751.50
1.751.751.75
Refer toFactory
1.50
1.251.25
2.00
1.502.00
1.50Refer toFactory
1.25
1.501.25
1.751.501.501.50
1.501.501.501.501.50
The application service factors shown above are considered typical formost applications. Where loads are lighter than normal, where units areoperated seasonally, or where unusual severe conditions exist, refer tofactory.
Top Related