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New Holland Tractor Workmaster 50 / Workmaster 60 / Workmaster 70 / Tier 4B (final). SERVICE MANUAL - page 8

Rear axle system - Rear bevel gear set and differential

Rear bevel gear set and differential - General specification

Pinion to crown wheel and differential

Pinion and crown wheel ratio

Pinion to crown wheel backlash

0.180 mm (0.007 in) - 0.230 mm (0.009 in)

Differential

4 pin

Differential lock control type

Mechanical operated with foot pedal

Differential lock free spring length

106.000 mm (4.170 in)

Compressed spring length, under a load of

82.000 mm (3.230 in)

365000.0 Kg/cm² (5191520.3 psi)

Side gear to differential gear backlash

0.100 mm (0.004 in) - 0.250 mm (0.010 in)

Differential gear pin diameter

21.960 mm (0.865 in) - 21.939 mm (0.864 in)

Bore diameter on differential gears for pin

22.098 mm (0.870 in) - 22.065 mm (0.869 in)

Bore diameter on differential case for pin

22.020 mm (0.867 in) - 22.000 mm (0.866 in)

Pin to differential gear clearance

0.159 mm (0.006 in) - 0.040 mm (0.002 in)

Pin to differential case clearance

0.082 mm (0.003 in) - 0.040 mm (0.002 in)

Rear bevel gear set and differential - Torque

Description

Thread size

Torque

Rear axle to transmission housing attaching bolts (C1)

M12 x 1.25

10 kgf (22 lbf)

Power Take-Off (PTO) cover bolts (C2)

M12

10 kgf (22 lbf)

Ring gear bolts (C3)*

M10

6 kgf (13 lbf)

Drain plug (C4)

M22

4.5 kgf (10 lbf)

27.2 [27.106] / 3

Rear axle system - Rear bevel gear set and differential

GNIL14TR04239GB

1

Rear bevel gear set and differential - Special tools

Tool description

Tool number

Differential plate check nut tightening tool

9971349

Installer oil seal wheel side (heavy duty)

84261386

Set screw socket 6.000 mm (0.236 in)

84261394

Yoke and spreader

291051 and 291052

Rear bevel gear set and differential - Sealing

Operation description

Sealant specification

Rear axle to transmission housing (S1)

LOCTITE® 518

Lift housing to transmission housing (S2)

LOCTITE® 518

Power Take-Off (PTO) cover plate (S3)

LOCTITE® 518

Crown wheel bolts (S4)

LOCTITE® 243

27.2 [27.106] / 4

Rear axle system - Rear bevel gear set and differential

GNIL14TR04240GB

1

27.2 [27.106] / 5

Rear axle system - Rear bevel gear set and differential

Rear bevel gear set and differential - Sectional view

Crown wheel and differential assembly

GNIL14TR04241GB

1

1.

Crown wheel

5.

Power Take-Off (PTO) shaft

2.

Pinion shaft

6.

Differential assembly

3.

Input shaft

7.

Brake

4.

Power Take-Off (PTO) input shaft

27.2 [27.106] / 6

Rear axle system - Rear bevel gear set and differential

Rear bevel gear set and differential - Remove

Crown wheel and differential housing

To remove the crown wheel and differential housing,

final drive housing, brake assembly and Power Take-Off

(PTO) assembly has to be removed.

Remove the rear axle housing as follows:

1. Detach the negative cable (1) from the battery and in-

sulate.

GNIL14TR00784AA

1

2. Disconnect the electrical couplings (1).

GNIL14TR00797AA

2

3. Detach electric connections (1) between left and right-

hand side fenders.

GNIL14TR04245AB

3

27.2 [27.106] / 7

Rear axle system - Rear bevel gear set and differential

4. Loosen the bolts (1), detach electrical connection and

remove operator seat from the hydraulic housing.

GNIL14TR04246AB

4

5. Disconnect hydraulic lines (1) on the hydraulic lift body.

GNIL14TR00798AA

5

6. Remove three point linkages from the tractor.

GNIL14TR00562AA

6

7. Loosen bolts securing foot rest to fender on both sides.

GNIL14TR00767AA

7

27.2 [27.106] / 8

Rear axle system - Rear bevel gear set and differential

8. Place the wedges at front and back on both sides of

front tires.

9. Jack up rear axle of the tractor and place two suitable

stands under transmission housing to raise the wheels

off the ground.

10. Drain oil from the transmission housing.

GNIL14TR00564AA

8

11. Remove both left and right-hand side wheels.

GNIL14TR04252AA

9

12. Loosen the bolts and remove fenders from both sides.

GNIL14TR00790AA

10

27.2 [27.106] / 9

Rear axle system - Rear bevel gear set and differential

13. Loosen the bolts (1) and remove ROPS.

GNIL14TR04251AA

11

14. Wrap suitable chain or nylon rope on the final drive

housing (1) and connect it to a hoist. Loosen attaching

bolts and remove the entire final drive.

GNIL14TR04253AB

12

15. Repeat for the final drive housing on the other side.

16. Remove the cover plate by removing Allen screw (1)

and remove cover plate (2). Retrieve oil rings 2 num-

bers from the housing and cover plate respectively.

17. Loosen the bolts securing hydraulic lift housing to

transmission housing. Lift the hydraulic lift assembly

using suitable hoist and place it on a flat surfaced

table.

18. Remove Power Take-Off (PTO) engaging levers and

differential lock.

GNIL14TR04255AA

13

27.2 [27.106] / 10

Rear axle system - Rear bevel gear set and differential

19. Remove PTO RPM sensor cable. Loosen the rear

Power Take-Off (PTO) cover bolts and pull out the

cover along with Power Take-Off (PTO) shaft and

Power Take-Off (PTO) input shaft assembly. See

Rear mechanical control - Remove (31.101).

GNIL14TR00742AA

14

20. Take out the differential assembly along with crown

wheel.

GNIL14TR04258AB

15

27.2 [27.106] / 11

Rear axle system - Rear bevel gear set and differential

GNIL14TR04259GA

1

Pattern for application of sealant during installation of Power Take-Off (PTO) cover, final drive housing

and mechanical lift housing.

• Check the backlash with the help of dial gauge.

Permissible backlash is 0.180 - 0.230 mm (0.007 -

0.009 in), if it is less than tighten left-hand side ring

nut after slightly loosening right-hand side ring nut.

• If it is more than 0.180 - 0.230 mm (0.007 - 0.009 in)

then first loosen left-hand side ring nut and then

tighten right-hand side ring nut.

27.2 [27.106] / 13

Rear axle system - Rear bevel gear set and differential

Differential - Disassemble

WARNING

Avoid injury!

Handle all parts carefully. Do not place your hands or fingers between parts. Use Personal Protec-

tive Equipment (PPE) as indicated in this manual, including protective goggles, gloves, and safety

footwear.

Failure to comply could result in death or serious injury.

W0208A

With the assembly removed from the rear axle housing

proceed as follows:

1. Loosen the crown wheel attaching bolts (1).

GNIL14TR04260AB

1

2. Detach the crown wheel (1) from the differential hous-

ing.

GNIL14TR04261AB

2

3. Loosen and remove all the bolts (1) from the casing.

GNIL14TR04262AB

3

27.2 [27.106] / 14

Rear axle system - Rear bevel gear set and differential

4. Lift the cover (1) as shown to get access to differential

gears.

GNIL14TR04263AB

4

5. Remove the locking pin (1) locking the differential gear

pivot pin.

GNIL14TR04264AB

5

6. Remove the pivot pin (1) and withdraw the side gears

from the differential housing along with trust washer.

GNIL14TR04265AB

6

NOTE: Four differential gear (1) and side gear (2) have

thrust washers with same thickness.

GNIL14TR04266AB

7

27.2 [27.106] / 15

Rear axle system - Rear bevel gear set and differential

7. Using suitable puller special tool number 291051 and

291052 remove the bearings from both the sides.

GNIL14TR04267AA

8

8. Remove the differential lock clutch from the housing.

GNIL14TR04268AB

9

27.2 [27.106] / 16

Rear axle system - Rear bevel gear set and differential

Differential - Backlash

Differential pinion and side gear backlash adjustment

Fit the two side gears (15) in the differential carrier with-

out the shims (12).

Install differential pinions

(13) complete with thrust

washer (14) and journal (3) and tighten bolts (1) a few

turns to prevent journal work out.

Bring left-hand side gear into full contact with differential

pinion.

Using a depth gauge measure dimension (H1) at two

diametrically opposed points and average the two read-

ings.

GNIL14TR04269AB

1

Then push side gear into contact with differential carrier

and measure dimension (H2).

Repeat the same operations on right-hand side gear.

End float of each side gear without the baulk ring must

be:

Gs or Gd = H1 - H2

where:

Gs = Left-hand side gear end float.

Gd = Right-hand side gear end float.

H1 and H2 = Dimensions measured on left-hand side

or right-hand side gears.

Normal differential pinion and side gear backlash is

0.15 mm (0.01 in).

Note that the average ratio normal backlash to the

GNIL14TR04270AB

2

equivalent side gear end float is 1 to 1.7.

Side gear end float corresponding to normal backlash

will be:

0.15 x 1.8 = 0.250 mm (0.010 in).

Consequently the shim thickness required in the differ-

ential carrier is given by:

Ss = Gs - 0.25 (for left-hand side gear)

Sd = Gd - 0.25 (for right-hand side gear)

Available shims are

1.200

-

2.000 mm

(0.047

-

0.079 in).

Install closest to calculated thickness.

Adjustment of bevel wheel bearings and crown pinion

NOTE: Place O-ring in the housing before fitting cover

plate.

1. Fit the locator pins (1) and fit the cover plate (2) tighten

the plate with Allen screws (3), screw out two Allen

screws (4) and remove lock plate from both sides.

GNIL14TR04271AA

3

27.2 [27.106] / 19

Rear axle system - Rear bevel gear set and differential

2. Tighten left-hand side ring nut (1) using special tool

number 9971349 until minimum backlash between the

bevel teeth is 1.000 mm (0.039 in).

GNIL14TR04272AB

4

3. Measure the backlash using dial gauge and magnetic

stand as shown in figure. Backlash to keep in between

0.180 - 0.230 mm (0.007 - 0.009 in).

GNIL14TR04273AA

5

4. Measure the torque using a spring balance and chord

wound around the sleeve of low gear it should be be-

tween 4.00 - 5.50 kgm (28.93 - 39.78 ftlbs).

GNIL14TR04274AA

6

5. Fit the lock plate

(1) back on bearing support ap-

ply thread lock sealant LOCTITE® 243™ to the Allen

screws.

GNIL14TR04275AA

7

27.2 [27.106] / 20

Rear axle system - Rear bevel gear set and differential

Bevel pinion - Remove

WARNING

Avoid injury!

Handle all parts carefully. Do not place your hands or fingers between parts. Use Personal Protec-

tive Equipment (PPE) as indicated in this manual, including protective goggles, gloves, and safety

footwear.

Failure to comply could result in death or serious injury.

W0208A

To remove the pinion shaft, it is necessary to remove

the transmission housing, from the tractor following the

procedure described under transmission assembly re-

moval installation. Also it is required to remove Power

Take-Off (PTO) cover and related components.

1. Remove the driven shaft, drive shaft and range shaft

before dismantling pinion shaft.

GNIL14TR04069AA

1

2.

1. To remove the crown wheel loosen set screws (1)

from the cover plate.

2. Remove crown wheel along with cover plate, retrieve

rubber ring from the housing.

GNIL14TR04070AB

2

3. Remove the crown wheel along with differential hous-

ing.

GNIL14TR04071AA

3

27.2 [27.106] / 21

Rear axle system - Rear bevel gear set and differential

4. Open the lock of pinion locking check nut with the help

of screw driver.

GNIL14TR04072AA

4

5. Fit pinion locking tool special tool

(1) number

84261392.

GNIL14TR04073AB

5

6. Remove the pinion shaft lock nut using special tool

number 84261389.

GNIL14TR04074AB

6

7. Withdraw pinion shaft from the differential housing and

retrieve low gear, sleeve, coupling etc from the pinion

shaft.

NOTE: Keep deep cut of hub towards pinion check nut

side.

GNIL14TR04075AA

7

27.2 [27.106] / 22

Rear axle system - Rear bevel gear set and differential

8. Remove the circlip lock of the Gama Basasa bearing to

remove bearing cone (1) from the housing.

GNIL14TR04076AB

8

9. Remove bearing from the pinion shaft using special tool

number 291051 and 291052.

GNIL14TR04077AB

9

27.2 [27.106] / 23

Rear axle system - Rear bevel gear set and differential

Bevel pinion - Install

1. Install the bearing on pinion.

GNIL14TR04078AB

1

2. Fit the outer cone of Gama Bassa bearing and fit circlip

lock.

GNIL14TR04079AA

2

3. Fit pinion shaft along with hub range, sliding sleeve,

bush and low gear as shown.

NOTE: Fit small spacer keeping cuts towards pinion teeth

side, also big spacer cut towards similarly.

NOTE: Keep deep portion of low gear hub, towards pinion

check nut side. After fitment check low gear it should rotate

free.

GNIL14TR04080AA

3

4. After fitting pinion, tighten pinion check nut at 28 kgm

(203 ftlbs.) and check pinion bearing preload by wrap-

ping a cord around low gear hub with the help or spring

balance it should be 2.5 - 3.0 kgm (18.1 - 21.7 ftlbs.).

NOTE: If recommended preload not comes, hammer pin-

ion using aluminium rod lock pinion check not, and check

again.

GNIL14TR04081AA

4

27.2 [27.106] / 24

Rear axle system - Rear bevel gear set and differential

Rear bevel gear set and differential - Troubleshooting

Problem

Possible Cause

Correction

Noisy rear axle when the

1. Pinion and/or ring gear bearing wrong

Remove rear axle housing and adjust pin-

tractor is moving and

adjustment

ion and ring gear bearings correctly

also when transmission

in neutral (not originating

from final drives)

2. Excess differential side gears to half-

Remove rear axle housing and replace

shaft spline backlash

damaged parts

Noisy rear axle with

1. Excess bevel pinion to ring gear back-

Remove rear axle housing and adjust bevel

tractor under load and

lash

pinion and ring gear bearings correctly

upon release

2. Fault or defective inner components

Remove rear axle housing, replace worn

parts and adjust differential gear backlash

correctly

Noisy rear axle with

1. Insufficient pinion and/or ring gear bear-

Remove rear axle housing and adjust bevel

overheating

ing backlash

pinion and ring gear bearings correctly

2. Insufficient bevel pinion to ring gear

Remove rear axle housing and adjust ring

tooth backlash

gear bearings correctly

27.2 [27.106] / 25

Rear axle system - Planetary and final drives

Final drive housing - Sectional view

GNIL14TR04242FB

1

Final drive

1.

Trumpet housing

3.

Planet gear

2.

Rear wheel shaft

27.3 [27.120] / 4

Rear axle system - Planetary and final drives

Final drive housing - Disassemble

WARNING

Avoid injury!

Handle all parts carefully. Do not place your hands or fingers between parts. Use Personal Protec-

tive Equipment (PPE) as indicated in this manual, including protective goggles, gloves, and safety

footwear.

Failure to comply could result in death or serious injury.

W0208A

1. Remove the pin (1) and disconnect the brake linkage.

GNIL14TR00789AA

1

2. Loosen the bolts and remove the rear wheel.

GNIL14TR00866AA

2

3. Loosen the bolts and remove fender.

GNIL14TR00790AA

3

27.3 [27.120] / 5

Rear axle system - Planetary and final drives

4. Remove the check chain and lower link of the three

point linkage.

GNIL14TR00864AA

4

5. Remove the ROPS (Roll Over Protective Structure).

NOTE: Use a suitable hoist.

GNIL14TR00865AA

5

6.

1. Wrap chain around final drive housing and loosen

bolts (1).

2. Remove the final drive housing.

GNIL14TR04276AB

6

7. Place the trumpet housing assembly on plane surface.

GNIL14TR04336AA

7

27.3 [27.120] / 6

Rear axle system - Planetary and final drives

8. Remove the linkage (1).

GNIL14TR00792AA

8

9. Remove the nut and spring. Remove the circlip.

GNIL14TR00791AA

9

10. Remove brake disc (1) and shaft (2).

GNIL14TR04277AB

10

11. Remove the brake actuator assembly (1).

GNIL14TR04278AB

11

27.3 [27.120] / 7

Rear axle system - Planetary and final drives

12. Remove second brake disc.

GNIL14TR00779AA

12

13. Remove intermediate plate and third brake disc.

GNIL14TR00780AA

13

14. Remove dual brake support (1) as shown.

GNIL14TR04279AB

14

15. Remove the set screw (1) holding the cover for road

wheel shaft.

GNIL14TR04280AB

15

27.3 [27.120] / 8

Rear axle system - Planetary and final drives

16. Remove spacers (1) planet final drive.

GNIL14TR04281AB

16

17. Remove all three planet gears along with needle bear-

ings.

GNIL14TR04282AB

17

18. Remove the circlip lock (1) of planet carrier sub as-

sembly.

GNIL14TR04283AB

18

19. Remove the spacer and shims (1).

GNIL14TR04284AB

19

27.3 [27.120] / 9

Rear axle system - Planetary and final drives

20. Remove planet carrier sub assembly (1).

GNIL14TR04285AB

20

21. Check planet gear spacers and needle bearings for

damage, replace if found worn out.

GNIL14TR04286AA

21

22. Hammer the wheel axle shaft out of the final drive

housing.

GNIL14TR04287AA

22

23. Retrieve the taper roller bearing.

NOTE: Ball bearings are fitted in low duty trumpet housing.

GNIL14TR04288AA

23

27.3 [27.120] / 10

Rear axle system - Planetary and final drives

24. Loosen the three bolts of mud protection cover from

the final drive housing.

GNIL14TR04289AB

24

25. Retrieve oil seal from the housing.

GNIL14TR04290AA

25

26. Retrieve the taper roller bearing, external spacer seal

and oil seal from the trumpet.

NOTE: During assembly insert bearing spacer over bear-

ing manually in heavy duty drive line.

NOTE: Ball bearing is fitted in low duty trumpet housing.

GNIL14TR04291AB

26

27.3 [27.120] / 11

Rear axle system - Planetary and final drives

Final drive housing - Assemble

Reinstall wheel and axle shaft in final drive housing

observing the following:

• Re assembling follows the removal procedure. See

Final drive housing - Disassemble (27.120).

• Refer to figure for correct orientation of the shafts

bearings sleeves and seals.

• Check seals and replace if damaged.

• Fit final drive housing oil seal back, by using the spe-

cial tool number 84261386.

• Check planet carrier after fitting circlip lock on axle

for free play. If notice any free play remove circlip

lock and place suitable shim below the spacer, so as

GNIL14TR04292AB

1

to eliminate free play completely.

NOTE: In low duty trumpet housing bearing preload

is not required.

• Before reassembling housing and covers thoroughly

clean and de-grease mating surfaces and apply a

2.00 mm (0.08 in) bead of sealant following the pat-

tern shown in the figure.

GNIL14TR04293AA

2

GNIL14TR04294FA

3

27.3 [27.120] / 12

Rear axle system - Planetary and final drives

Final drive housing - Troubleshooting

Problem

Possible Cause

Correction

Noisy final drives when

1. Wheel axle shaft bearing badly adjusted

Remove final drive case and adjust bear-

the tractor is moving and

ings

also with transmission in

neutral

2. Faulty or defective inner components.

Remove final drive case and replace dam-

aged parts

3. Excess bull and pinion gear backlash

Remove final drive case and replace dam-

aged parts

27.3 [27.120] / 13

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