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Motorhome Suspensions

RT1330

Owner’s Manual

Reyco Granning Suspensions1205 Industrial Park DriveMount Vernon, MO 65712 Phone: 417-466-2178 Fax: 417-466-3964

1-800-753-0050ww w.reycogrann ing .com

Revision Date: 2/15

Document #: D708721Revision: F

| Tag Axle Suspension

Service Parts Maintenance Instructions

On Highway Suspension System

COMPANY PROFILE

Reyco Granning Suspensions was formed by the merger and acquisition of two well-known names in the heavy duty vehicle suspension industry—Reyco and Granning.

Reyco grew out of the Reynolds Mfg. Co and was first known as a major supplier ofbrake drums for heavy duty vehicles and later developed a full line of air and steel-spring suspensions for trucks, buses, trailers and motor homes.

Granning Air Suspensions was founded in 1949 in Detroit, Michigan as amanufacturer of auxiliary lift axle suspensions. Granning later became an innovatorof independent front air suspensions for the motor home industry.

Reyco Granning manufacturing facilities are certified to the ISO 9001:2008standards, a globally-recognized assurance that quality standards have beenestablished and are maintained by regular rigorous audits.

Reyco Granning LLC was formed in early 2011 through a partnering of seniormanagers and MAT Capital, a private investment group headquartered in LongGrove, Illinois.

Congratulations on your purchase of a ReycoGranning® AIRGLIDE® tag axle airsuspension system. Founded in 1948 by one of the pioneers of air suspensions,ReycoGranning® Air Suspensions supplies front steer, drive and tag axle airsuspension systems to a variety of original equipment manufactures as well as to theaftermarket industry. The R-Series, trade named AIRGLIDE®, are utilized by OEMcustomers in applications such as recreational vehicles, shuttle bus, trailer, chassisbuilders, Type I and III ambulances and class 3 through 8 truck applications. Thisproduct line now exceeds 25 models that cover all major chassis utilized in the aboveapplications.

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Table of ContentsRT1330 SUSPENSION SERVICE MANUAL......................................v

Service Notes...................................................................................................................... vINTRODUCTION....................................................................................6

Identification...................................................................................................................... 7RT1330 Tag Axle Parts List ............................................................................................. 8RT1330 Service Parts........................................................................................................ 8

SUSPENSION SYSTEM - TROUBLESHOOTING...........................10INSPECTION & MAINTENANCE .....................................................11

Checking the Trailing Arm Bushings for Wear......................................................... 11Preparation.......................................................................................................................11Inspection .........................................................................................................................12

Checking the Shock Absorber ...................................................................................... 12Preparation.......................................................................................................................12Inspection .........................................................................................................................12

Checking the Air Spring ................................................................................................ 12Preparation.......................................................................................................................12Air Spring Inspection .......................................................................................................13

MAINTENANCE SCHEDULE........................................................................................ 14MAINTENANCE RECORD............................................................................................. 15Adjusting Suspension Ride Height .............................................................................. 16

Preparation.......................................................................................................................16Adjustment (Drive Axle) ..................................................................................................16

Inspection before Alignment ........................................................................................ 16Inspection .........................................................................................................................16Wheels and Tires ..............................................................................................................16

Rear Axle Alignment....................................................................................................... 17Measurement....................................................................................................................17Adjustment .......................................................................................................................18

Tag Axle Wheel Bearing Adjustment........................................................................... 18Remove the Keeper...........................................................................................................19Seat the Bearing...............................................................................................................19Adjust the Bearing ...........................................................................................................20Install the Keeper.............................................................................................................20

Inspect The Installation: ................................................................................................ 21Verify Wheel End-Play:....................................................................................................21

REPAIRING OF PARTS......................................................................22Cleaning the Parts .......................................................................................................... 22

Ground or Polished Parts.................................................................................................22Rough Parts ......................................................................................................................22Drying ...............................................................................................................................22Preventing Corrosion .......................................................................................................22

Removing and Installing the Trailing Arm Assemblies .......................................... 22Preparation.......................................................................................................................22Removal ............................................................................................................................22

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Installation .......................................................................................................................23Replacing the Trailing Arm Bushings ........................................................................ 23Replacing the Shock Absorber ..................................................................................... 23

Preparation.......................................................................................................................23Removal ............................................................................................................................23Installation .......................................................................................................................23

Replacing the Air Spring ............................................................................................... 23Preparation.......................................................................................................................23Removal ............................................................................................................................24Installation .......................................................................................................................24

TORQUE SPECIFICATIONS .............................................................25Torque Specifications-Tag Axle ................................................................................... 26

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RT1330 SUSPENSION SERVICE MANUALService NotesThis publication is intended to acquaint and assist maintenance personnel in themaintenance, service, repair and rebuild of the ReycoGranning® RT1330 Rear TagSuspension. It is important to read and understand the entire Technical Procedurepublication prior to performing any maintenance, service, repair, or rebuild of this product.

ReycoGranning® Air Suspensions reserves the right to modify the suspension and/orprocedures and to change specifications at any time without notice and without incurringobligation. Contact customer service at 800-753-0050 for information on the latest versionof this manual.

You must follow your company safety procedures when you service or repair thesuspension. Be sure you read and understand all the procedures and instructions beforeyou begin work on the suspension.

ReycoGranning® uses the following types of notes to give warning of possible safetyproblems and to give information that will prevent damage to equipment.

WARNINGA warning indicates procedures that must be followed exactly. Serious personalinjury can occur if the procedure is not followed.

CAUTIONA caution indicates procedures that must be followed exactly. Damage toequipment or suspension components and personal injury can occur if theprocedure is not followed.

NOTEA note indicates an operation, procedure or instruction that is important forcorrect service.

Some procedures require the use of special tools for safe and correct service. Failure to usethese special tools when required can cause personal injury or damage to suspensioncomponents.

The latest revision of this publication is available online athttp://www.reycogranning.com/

Section 1Introduction

Introduction

Model Capacity(lbs)

FrameWidth

(in)RT1330-W

14,000 34.00RT1330-TBRT1330-F 14,000

34.25RT1330-SS 12,000

Overloading the suspension may result in adverse ride and handling characteristics

Reyco Granning Air Suspensions has developed this service manual to aid in the maintenance ofReyco Granning’s rear suspenions.

The following table lists the various models and their respective capacities and frame width dimension.

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IdentificationThe serial number is used by ReycoGranning® for control purposes and should bereferred to when servicing the suspension (See Figure 1). The suspension model andserial number are stamped on an aluminum tag that is riveted to the driver side upperHanger Weldment (See Figure 2).

Figure 1: Suspension Identification

Figure 2: Suspension Identification (RT1330-W Shown)


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RT1330 Tag Axle Parts ListITEM PART NO. DESCRIPTION ITEM PART NO. DESCRIPTION

1707444-01 Weldment, LH Hanger, Adj. (-W) 22 188 Pop Rivet Ø1/8" x .525" Lg

711283-01(2) Weldment, LH Hanger, Adj. (-F,-SS) 23 104098 HFW 7/8" .968 x 1.780 x .160, ZN711323-01 Weldment, LH Hanger, Adj. (-TB) 24 2617 Plate-Serial No.

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707444-02 Weldment, RH Hanger, Adj. (-W) 25 8103323 SLW 1/2" .523 x .873 x .134, PL711282-02(2) Weldment,RH Hanger,Fixed (-F,-SS) 26 118 FW 1/2" .531 x 1.062 x .095, ZN711228-02(1) Weldment, RH Hanger, Fixed (-TB) 27 8120378 N 1/2-13, Gr. 5, ZN711323-02 Weldment, RH Hanger, Adj. (-TB) 28 702516-02 HHB 1-1/8-12 x 7.75, Gr. 8, ZN

3 707448-01 Cross-Member 29 168 HFW 1-1/8", ZN4 708186-01 LFN 5/8-11, Gr. 8, ZN

30708720-01 Axle Assembly (34” Frame)

5 708185-01 FHB 5/8-11 x 1.50, Gr. 8, ZN 708720-02 Axle Assembly (34.25” Frame)6 707433-01 Assembly, Trailing Arm (LH)

31*708719-01 Weldment, Axle & Seats (34")

7 707433-02 Assembly, Trailing Arm (RH) *708719-02 Weldment, Axle & Seats (34.25")8 705453-01 Washer, Disk Spring 32 *708141-01 Hub & Drum9 710513-01 Plate, Tension 33 *707963-01 Bearing P-Spindle (Cone)

10 24453-01 Coiled Spring Pin 34 *707969-01 Hub Cap Gasket11 166 LN 1 1/8-12, GR. C, PO 35 *710436-01 Hub Cap12 705456-01 Rey Align Adjustment Shaft 36 *266 FHB 5/16-18 x .75, Gr. 5, ZC w/LS13 702516-03 HHB 1 1/8-12 x 9, Gr. 8, ZN 37 *7328 ABS Sensor (Straight w/ Lead)14 707449-01 Wear Spacer, Polyethylene 38 *6946 ABS Sensor Spring Retainer15 705454-02 Washer (Non-Flanged) 39 *708152-01 Spindle Nut (PRO-TORQ) w/ Keeper16 103003 HFW 3/4" .812 x 1.475 x .150 40 *707970-01 Hub Oil Seal17 8131017 FW 3/4" .812 x 1.469 x .134, ZN 41 700178-09 Shock Absorber18 100678-P1 HHB 3/4-10 x 3.5, GR. 8, ZN 42 708153-01 Air Spring19 208 LFN 3/4-10, Gr. G, ZN 43 8120384 SLW 1/2" .523 x .873 x .135 ZN20 89430598 HHB 7/8-9 x 8, GR.8 44 708159-01 HHB M12-1.75 x 25, CL10.9, PH21 100122-P1 LN 7/8-9 UNC Stover, Gr. C, ZN

*Included in Complete Axle (Chambers not included)(1) Superseded by 711323-02(2) Bolt Pattern Changed –F Superseded by –SS

RT1330 Service PartsPart No. Description Qty

703903-05 Brake Linings, Q+ PL133 16.5 x 7 4708155-16 Brake Air-Chamber Type 16 2708155-20 Brake Air-Chamber Type 20 2708140-01 Automatic Slack Adjuster 2HM518410 Hub Bearing Race 4

708155-01 Superseded by 708155-20


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Figure 3: Parts List (RT1330-F Shown, others similar)

Section 2Troubleshooting

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SUSPENSION SYSTEM - TROUBLESHOOTINGSYMPTOMS POSSIBLE CAUSES REMEDIES

Tires wear out quickly or haveuneven tire tread wear.Note: Wear pattern will indicatepossible cause(s). Consult tiremanufacturer for guidance.

1) Tires have incorrect pressure 1) Put specified air pressure intires

2) Tires out of balance 2) Balance or replace tires3) Incorrect ride height 3) Adjust ride height to specified

setting4) Incorrect rear axle alignment 4) Align rear axle to specified

thrust angle5) Improper (mismatched) tires

and wheels5) Install correct tire and wheel

combination

Vehicle rolls side to sideexcessively

1) Front and/or rear shockabsorbers worn

1) Replace shock absorbers asneeded

2) Shock mounting loose 2) Check and tighten as required3) Shock eye bushings worn 3) Check and replace as needed4) Trailing Arm bushings worn 4) Inspect and replace as required5) Check for air leak including the

height control valve5) Check height control valve and

replace as required.

Vehicle ride is too harsh and/orsuspension contacts stopsexcessively

1) Shock absorbers worn 1) Replace shock absorbers asneeded

2) Incorrect ride height 2) Adjust ride height to specifiedsetting

3) Vehicle overloaded 3) Check wheel loads and correctas needed

4) Air spring supply lines leakingor obstructed

4) Check air line connections andremove obstructions

5) Vehicle system air pressurebelow specification

5) Check air pressure and correctas needed

6) Jounce bumper in air springworn or broken

6) Check and replace air spring asrequired

Vehicle ride is too soft1) Shock absorbers worn 1) Replace shock absorbers as

needed2) Incorrect ride height 2) Adjust ride height to specified

setting

Suspension does not maintainride height

1) Air leak 1) Check connections with soapywater solution and repair orreplace as needed

2) Internal leak in height controlvalve

2) Check height control valve andreplace as required

3) Height control valve linkageloose

3) Check and tighten linkage asneeded

4) Air spring chafed or worn 4) Check air spring and replace asneeded

Section 3Inspection & Maintenance

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INSPECTION & MAINTENANCEPerform a thorough visual inspection of the suspension to ensure proper assembly and toidentify broken parts and loose fasteners each time the vehicle suspension is serviced. Dothe following during an inspection.

Wheel Alignment - Follow the guidelines in Section 5 for wheel alignmentinspection intervals. Check wheel alignment if excessive steering effort, vehiclewander, or abnormal tire wear is evident.Fasteners - Check that all the fasteners are tightened to the proper tighteningtorque. Use a calibrated torque wrench to check torque.Wear and Damage - Inspect components of the suspension for wear and damage.Look for bent or broken components. Replace all worn or damaged components.Operation - Check that all components move freely through the complete jounce-rebound travel range.

CAUTION: ReycoGranning® recommends replacing any damaged or out-of-specification components. Reconditioning or field repairs of major rearsuspension components is not allowed.

Note: Refer to Section 1 for identification of components.

Checking the Trailing Arm Bushings for WearNOTE: ReycoGranning® recommends the use of a maintenance pit or full vehicle

lift during the inspection of components.

Preparation1. Chock the front wheels to prevent vehicle movement.2. Raise the rear of the vehicle until the wheels are off the ground. Support raised

vehicle with safety stands. Do not place jacks or safety stands under the TrailingArms to support the vehicle.

WARNING: Never work under a vehicle supported by only a jack. Jackscan slip or fall over and cause serious personal injury. Always use safetystands.

3. Remove the tires.


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Inspection1. Inspect rubber bushings for large splits, tears, and major wear. Replace bushings

as needed.2. Check that the Trailing Arm mounting bolts are tight. The recommended torque is

950-1050 Ft-Lb (See Torque Table).

Checking the Shock AbsorberNOTE: ReycoGranning® recommends the use of a maintenance pit or full vehicle

lift during the inspection of components.

Preparation1. Set the parking brake and block the drive wheels to prevent vehicle movement.

WARNING: The shock absorbers are the rebound travel stops for thesuspension. It is mandatory to keep the shock absorbers connected anytime thetag axle is suspended. If the shocks are not connected, then the air spring willseparate from the piston under the weight of the axle.

Inspection1. Check shock absorber for oil leakage, bent components, missing or broken

components, excessive corrosion, or worn bushings. Replace shock if any of theabove items is present.

NOTE: A film of oil/dust does not indicate oil leakage. Oil misting is a normalcondition for this type of shock absorber. Consult shock manufacturerdocumentation.

Checking the Air SpringPreparation

1. Set the parking brake and block the drive wheels to prevent vehicle movement.

WARNING: Ensure all personnel and equipment are clear from under thevehicle prior to and during the inflation and deflation of the air springs. Failureto do so can cause property damage and serious injury or death.


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CAUTION: Slowly inflate the suspension to ensure the air spring rubberbladder inflates uniformly. Failure to do so can cause damage to the air springand void the warranty.

Air Spring Inspection1. Check the outside diameter of the air spring for irregular wear or heat checking.2. Check air lines to make sure contact does not exist between the air lines and the

outside diameter of the air spring. Re-secure air lines to prevent contact as needed.Check for air line and fitting leaks with soapy water solution.

3. Check to see that there is a minimum of 1-inch clearance around the circumferenceof the air spring while it is energized with air.

4. Check the air spring piston for buildup of foreign material. Remove any foreignmaterial that is present. Check for chafing or pinched air lines. Check the heightcontrol valve linkage for damage or interference with peripheral components.Replace all worn or damaged parts.


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MAINTENANCE SCHEDULEGENERAL

MAINTENANCE SERVICE TO BE PERFORMEDMILEAGE INTHOUSANDS

12 24 36 48 60 72 84 96Trailing ArmBushings

Check bolt torque X X X X1

Inspect for contact between Trailing Armand mount X X X X X X X X1

Inspect for bushing wear X X X X X X X X1

Air Springs Inspect for proper clearance (1” minimumall around) X X XCheck upper mount nut and lower mountbolt torque XInspect for signs of chafing or wear X X X X X X X X1

Check for air line fitting torque XInspect for air leaks using soapy watersolution X

Shock Absorbers Check stud mount and lock nut torque XInspect shocks for signs of fluid leak,broken eye ends, loose fasteners, or wornbushings

X X X X X X X X1

Rear Alignment Inspect (after first 1000-3000 miles) X X X X1

Air Fittings and AirLines

Inspect for air leaks using soapy watersolution X XInspect for signs of chafing, cracking, orwear X X X X X X X X1

Brake Components Inspect Air Chamber Stroke X X X X X X X X1

Inspect Auto Slack Adjuster Function X X X X X X X X1

Lubricate S-Cam Tube and AutomaticSlack AdjusterPremium Multi-Purpose Chassis GreaseNLGI Grade 2

X2 X2

Wheel End Inspect Hub for oil leaks Every 1,000 milesCheck Oil Level Every 1,000 milesChange OilGear Oil SAE 80W/90 or equivalent X3

1. Continue to perform specified maintenance every 12,000 miles or at previous interval2. Whichever comes first: Brakes Relined, 50,000 Miles, or Once a Year3. Whichever comes first: Seals Replaced, Brakes Relined, 100,000 Miles, or Once a Year

CAUTION: Do not mix lubricants of different grades. Do not mix mineraland synthetic lubricants. Different brands of the same grade may be mixed.

CAUTION: Never mix oil bath and grease packed wheel ends.


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MAINTENANCE RECORDName of Owner: Address of Owner:

Date of Purchase: Name and Address of Dealer:

Model of Vehicle: Vehicle Identification Number:

Suspension Model Number:RT1330-W, RT1330-TBRT1330-F, RT1330-SS

Suspension Serial Number:

Inspection and MaintenanceItem

Date Mileage Service Performed

Section 4Adjustments and Alignments

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Adjusting SuspensionRide HeightThe ride height of the tag suspension isthe distance from the bottom of thechassis frame rail to the center of theaxle. Properly adjusted ride height of thedrive axle results in correct suspensiontravel and alignment. The ride heightshould not be adjusted to adjust chassisrake angle.

Preparation1. Park the vehicle on a level surface.2. Exhaust or “dump” and re-inflate

the air suspension. Allow theSuspension to settle.

3. Set the parking brake and block thedrive wheels to prevent vehiclemovement.

4. Check that the front suspension isadjusted to the correct ride heightper the vehicle manufacturersspecifications.

5. Check height control valve plumbingto ensure there are not any airleaks.

6. Make sure shock mounts aremounted securely and not bent.

Adjustment (Drive Axle)1. Measure the distance from the

bottom of the frame to the center ofthe axle. If the distance measured isnot within manufacturers’specifications, then adjust asfollows.

2. Loosen the clamp on the verticallink of the height control linkage.

3. Adjust the length of the vertical linkto achieve specified ride height. Ifthe measured distance is less than

manufacturers’ specification, thenincrease the length of the verticallink. If the measured distance isgreater than manufacturers’specification, then decrease thelength of the vertical link. Exhaustor “dump” and re-inflate the airsuspension. Allow the suspension tosettle.

NOTE: The horizontal link mustremain horizontal during adjustmentto ensure proper operation of theheight control valve.

4. Tighten the clamp on the verticallink.

Inspection beforeAlignmentCheck the following before conductingalignment measurements.

InspectionSee “General Inspection” in Section 3.

Wheels and Tires1. Check that the rear tires are

inflated to the appropriate pressurebased on the wheel loading.

2. Check that the rear tires are thesame size and type.

3. Check that all the wheel nuts aretightened to the specified torque.

4. Check that the wheels are balanced.5. Check that all fasteners are

tightened to the specified torque.6. Check the drive suspension ride

height and adjust as needed todefined height.


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7. Check that all connection jointsbetween the suspension and axle aresecure.

8. Check for worn suspension bushingsor damaged suspension components.

9. Check that the frame is not bent.

NOTE: Total vehicle alignment isrecommended when aligning the rearsuspensions.

Rear Axle AlignmentMeasurement

1. Place the unloaded vehicle on a levelfloor area. Move it back and forthseveral times, slowly and withoutusing the brakes, to free allsuspension joints.

2. Chock the front wheels with thebrakes released.

3. Position an 8-foot piece of straightbar stock or angle iron squarelyacross the frame and clamp itsecurely. The use of a carpenter’ssquare is recommended to be certainthe bar is square to the frame.

4. The cross bar should be positionedas far forward of the drive axle asroom will permit.

5. Beginning on the passenger side,measure from the bar stock to thecenterline of the rear drive axle onboth sides. Adjust the drive axle asnecessary.

6. Using a Trammel Bar, determinedimensions A and B shown inFigure 4.

7. The difference of the A and Bmeasurements must not exceed 1/8”.Adjust the tag axle as necessary.

Figure 4: Alignment Measurements


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Adjustment1. Chock the front wheels.2. Securely support the rear frame of

the vehicle.

WARNING: Never work under avehicle supported by only a jack.Jacks can slip or fall over andcause serious personal injury.Always use safety stands.

3. Exhaust the air from the air springsto remove the load to the TrailingArm.

4. Loosen the Rey-Align nut but do notremove.

5. Rotate the adjusting fastener tomove the tag axle fore and aft onDrivers’ (Left) side. Continue untilyou achieve the correct alignment.

NOTE: ±3/8” Total adjustment isavailable. (3/16” / Side with 2adjustment points ‘-W’ only.)

6. Torque the Pivot Bolt to 950-1050Ft-Lb (See Torque Table).

Step 1: 150 Ft-LbStep 2: 250 Ft-LbStep 3: 400 Ft-LbStep 4: 650 Ft-LbStep 5: 950-1050 Ft-Lb

Tag Axle Wheel BearingAdjustment

WARNING: Failure to follow thisinstruction could result in theloss of the wheel assembly andcause bodily injury. The PRO-TORQ® Spindle Nut is sold as anassembly with the keeper inplace. DO NOT attempt to placethe nut on the spindle or tightenor loosen the nut on the spindlewhile the keeper is locked insidethe nut. Doing so may deformthe keeper and allow the nut tounthread during operation.

This procedure follows the guidelines ofTMC RP 618.

Lubricate the bearing with clean axlelubricant of the same type used in thehub assembly.


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Remove the Keeper

A, B, C Use a small screwdriver tocarefully pry the keeper arm from theundercut groove on each side until thekeeper is released.

Seat the Bearing

With Hub or Hub/Drum only:Using a torque wrench,A (1) Tighten the nut to 200 Ft-Lb. Spinthe wheel at least one full rotation.

(2) Tighten the nut to 200 Ft-Lb. Spinthe wheel at least one full rotation.

(3) Tighten the nut to 200 Ft-Lb.

B Back the nut off until it is loose.

Tools Required For InstallationPart

Number(3/4” Drive)

Socket Req’dOwatonna Co.Ref. Part No.

Euclid Int’lRef. Part No.

708111-01 4 13/16”8 Point 1941 E-1597


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Adjust the Bearing

With Hub or Hub/Drum only:Using a torque wrench,

A (1) Tighten the nut to the adjustingtorque. Spin the wheel at least one fullrotation.(2) Tighten the nut to the adjustingtorque. Spin the wheel at least one fullrotation.(3) Tighten the nut to the adjustingtorque.B Back the nut off one raised face mark(according to chart).

Adjusting Torque and Back-OffPro-Torq Nut Adjusting Torque Back-Off

Parallel Spindle 100 Ft-Lb 1/8 turn

WARNING: Failure to follow thisinstruction could cause thewheel to come off and causebodily injury. Failure to back-off the nut will cause thebearing to run hot and bedamaged.

Install the KeeperORANGE SIDE FACING OUT

A Insert the keeper tab into the undercutgroove of the nut and engage the keyway

tang in the axle keyway. Insert keepertab with the orange side facing out.

B Engage the mating teeth.

C Compress and insert the keeper arms,one at a time, into the undercut groovewith a small screwdriver.

WARNING: Failure to follow thisinstruction could cause thewheel to come off and causebodily injury. Do not bend ormanipulate keyway tang in anyway. Doing so may cause thetang to break off in service.


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Inspect The Installation:Failure to follow this instruction couldcause the wheel to come off and causebodily injury. Make sure that thekeeper tab and keeper arms are fullyseated into the undercut groove. Inspectkeyway tang to insure it does notcontact the bottom of the keyway. Ifcontact exists, immediately notify yourcustomer service representative.

Verify Wheel End-Play:

NOTE: This procedure willconsistently produce a bearingsetting of .001˝ to .003˝ end play.

Verify end-play with a dial indicator(See Figure 5). Wheel end-play is thefree movement of the wheel assemblyalong the spindle axis.a) Attach a dial indicator with its

magnetic base to the hub.b) Adjust the dial indicator so that its

plunger or pointer is against the endof the spindle with its line of actionparallel to the axis of the spindle.

c) Grasp the hub assembly at the 3o'clock and 9 o'clock positions. Pushand pull the wheel end assembly inand out while oscillating the wheelapproximately 45 degrees. Stoposcillating the hub so that the dialindicator tip is in the same positionas it was before oscillation began.Read the bearing end-play as thetotal indicator movement.

NOTE: If end-play is not withinspecification of 0.001" to 0.004",readjustment is required.

Figure 5: Wheel End-play Verification

Section 5Repair

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REPAIRING OF PARTSWARNING: The repair orreconditioning of rearsuspension components is notallowed. ReycoGranning®

recommends replacing damagedor worn components. Severalmajor components are heattreated and tempered. Thecomponents cannot be bent,welded, heated or repaired inany way without reducing thestrength or life of the componentand voiding the warranty.

WARNING: If you use cleaningsolvents, hot solution tanks oralkaline solutions incorrectly,serious personal injury canoccur. To prevent injury, followthe instructions supplied by themanufacturer. DO NOT usegasoline to clean parts. Gasolinecan explode.

Cleaning the PartsGround or Polished Parts

Use a cleaning solvent to clean groundor polished parts and surfaces. DO NOTclean ground or polished parts with hotsolution tank or with water, steam oralkaline solutions. These solutions willcause corrosion of the parts.

Rough PartsRough parts can be cleaned with theground and polished parts. Rough partsalso can be cleaned in hot solution tankswith a weak alkaline solution. Partsshould remain in the hot solution tanksuntil they are completely cleaned.

DryingParts must be dried immediately aftercleaning. Dry the parts with cleanpaper, rags, or compressed air.

Preventing CorrosionApply light oil to cleaned and driedparts that are not damaged and are tobe immediately assembled. If the partsare to be stored, apply a good corrosionpreventative to all surfaces and placethem inside special paper or containersthat prevent corrosion.

Removing and Installingthe Trailing ArmAssembliesPreparation

1. Chock the front wheels.2. Firmly support the rear vehicle

frame.


Removal1. Exhaust the air from the air spring.2. Detach the air spring from the

Trailing Arm.3. Remove the Cross Member4. Remove Axle Saddle Bolts.5. Remove Shocks.6. Loosen the pivot bolt nut.

Section 5Repair

23

Installation1. Slide the Trailing Arm assembly

into the pivot hanger.2. Insert the pivot bolt with all Rey-

align components.3. Check alignment per alignment

section.4. Torque the Pivot Bolt to 950-1050

Ft-Lb (See Torque Table).Step 1: 150 Ft-LbStep 2: 250 Ft-LbStep 3: 400 Ft-LbStep 4: 650 Ft-LbStep 5: 950-1050 Ft-Lb

Replacing the TrailingArm Bushings

1. Remove the Trailing Arm assemblyas described above.

2. Press the bushing out using aproperly sized bushing press.

3. Press in new bushing.4. Reinstall as per the previous

instructions.

Replacing the ShockAbsorberPreparation

1. Set the parking brake and block thefront wheels to prevent vehiclemovement.

Removal1. Loosen and remove the upper shock

absorber mount bolt from the upperShock Mount.

2. Loosen and remove the lower shockabsorber mount bolt from theTrailing Arm.

Installation1. Install the upper shock absorber

Fasten using the bolt.2. Install the lower shock absorber bolt

loosely to the Trailing Armassembly.

3. Raise or lower the suspension toapproximately ride height.

4. Torque both mount fasteners to 150-190 Ft-Lb (See the Torque Table).

Replacing the Air SpringWhen replacing the air spring be surethat the correct replacement air spring isinstalled. The use of a substitute airspring that is not recommended byReycoGranning® may cause unequalload sharing between the air springswhich may be detrimental to vehicle rideand handling.

Preparation1. Set the parking brake and block the

front wheels to prevent vehiclemovement.

2. Firmly support the rear of thevehicle frame.


3. Deflate the air springs.

Section 5Repair

24

Removal1. Disconnect the air line at the air

spring and remove the connectionfitting.

2. Remove the bolts that secure the airspring to the lower cross-memberassembly.

3. Remove the nuts and washers fromthe upper frame rail mount.

4. Remove the air spring.

Installation1. Assemble the bolts and washers that

connect the air spring to the TrailingArm. Tighten the bolts to 40-50 Ft-Lb (See Torque Table).

2. Assemble the air spring to theHanger. Tighten the nuts to 20-30Ft-Lb (See Torque Table).

3. Install the connection fitting into theair spring. Use Permatex sealantw/ Teflon or equivalent threadsealant.

4. Connect the air line to the airspring.

5. Lower the vehicle frame and inflatethe air springs.

6. Check the air fittings for leaks.

Section 5Repair

25

TORQUE SPECIFICATIONSMost threaded fasteners are covered byspecifications that define requiredmechanical properties, such as tensilestrength, yield strength, proof load, andhardness. These specifications arecarefully considered in initial selection offasteners for a given application. Toassure continued satisfactory vehicleperformance, replacement fasteners usedshould be of the correct strength, as wellas the correct nominal diameter, threadpitch, length, and finish.

Torque Table

ReycoGranning Recommended Torque Specifications

Item Assembly Fastener Torque (Ft/Lb)1 Shock Absorber Mounting Bolts HHB 3/4-10 x 3 1/2, Gr 8, ZN 150-1902 Air Spring Mount Nut N 1/2-13, Gr 5, ZN 20-303 Lower Air Spring Mounting Bolts HHB M12-1.75 x 25, Gr10.9, PH 40-504 Axle Seat to Trailing Arm HHB 7/8-9 x 8, Gr 8, ZN 450-4755 Hanger to Cross-Member FHB 5/8-11 x 1 3/4, Gr 8 PH 175-1906 Hub Cap FHB 5/16-18 x 3/4, Gr 5 ZC W/LS 12-167 Hanger to Trailing Arm HHB 1 1/8-12 x 8 1/2, Gr 8, ZN 950-10508 Axle Spindle Nut to Axle PRO-TORQ **

**Follow procedure listed in Tag Axle Wheel Bearing Adjustment

Note: Torque values listed above apply only if ReycoGranning supplied fasteners are used. Forinformation regarding component replacement or technical service call 1-800-753-0050

Grade Lock NutGrade B, F

Lock Nut:Grade C, G

Identification

3 Dots 6 Dots

Figure 6: Grade Markings on Lock Nuts

Figure 5: Grade Markings on Bolts

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Torque Specifications-Tag AxleRecommended Torque Values (Foot Pounds)

Figure 7: Exploded Assembly (RT1330-F Shown)The components illustrated inFigure 7 are supplied byReycoGranning®. Forinformation regardingcomponent replacement ortechnical service call customerservice at 1-800-753-0050.

IS0 9001:2008 Certified

w w w. reyco g ran n i n g . co m

Mount Vernon1205 Industrial Park DriveMount Vernon,MO 65712

(800) 753-0050,Fax (417) 466-39641-800-753-0050

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