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New Holland Tractor Workmaster 50 / Workmaster 60 / Workmaster 70 / Tier 4B (final). SERVICE MANUAL - page 7

Front axle system - Final drive hub, steering knuckles, and shafts

Steering knuckle and king pin - Remove

In the event that the steering knuckle pins prove difficult

to remove, proceed as follows.

1. Remove the grease nipples and the steering knuckle

pin retaining bolts.

2. Install the bolts (1) using tool number 380000265.

3. Install the plate (2) from the tool and retain it to the three

bolts with nuts (3).

4. Install the central tie bolt (4) screwing it fully into the

grease nipple bore on the pin (5).

5. Screw in the nut (6) to drive the pin out of its bore.

GNIL14TR04428AB

1

6. Using extractor tool, tool number 380000234 (1), re-

move the steering knuckle bearings.

GNIL14TR04429AB

2

NOTE: Re-install the steering knuckle bearings using a suitable drift.

25.3 [25.108] / 3

Front axle system - Final drive hub, steering knuckles, and shafts

Steering knuckle and king pin - Adjust (Stub Axle)

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

Install the front axle on a stand and proceed as follows.

1. Smear grease on the outer races of the bearings and fit

the upper cover, without the adjustment plate, but with

tool number 380000235 (1). Tighten the retaining bolts

to a torque value of 64 N·m (47 lb ft).

GNIL14TR04412AB

1

2. Install the lower cover without adjustment plate, lubri-

cate the three retaining bolts with oil.

3. Gradually tighten the lower cover bolts in sequence,

while simultaneously rotating the casing to allow the

excess grease to escape.

GNIL14TR04413AA

2

4. Using a torque wrench, tool number 380000235 (1),

check that the torque required to rotate the casing is

2.9 N·m (25.7 lb in) without considering the peak start-

ing value. If not, adjust by way of the lower cover bolts.

5. Measure the gap (H) created between the low cover

and the casing in correspondence with the three bolts.

GNIL14TR04414AB

3

6. Calculate the average of the three values measured.

The total thickness of the adjustment shims to be fitted

under the lower cover is to be calculated as follows:

S3= H

If necessary, round up the value to the next 0.05 mm

(0.002 in).

25.3 [25.108] / 4

Front axle system - Final drive hub, steering knuckles, and shafts

7. Partially unscrew the bolts of the lower cover, insert the

shims and tighten the bolts to a torque value of 64 N·m

(47 lb ft).

8. After having rotated the casing a few times to allow

the components to bed down, check that the torque

necessary to rotate the casing is 2.9 N·m (25.7 lb in)

- 7.8 N·m (69 lb in), without considering the initial peak

torque.

9. If the torque value measured is greater than the pre-

scribed value, increase the thickness of the shims, if

the measured value is less than the prescribed value,

reduce the thickness of the shims.

10. Install the grease nipples in the upper and lower cov-

ers and grease the assembly.

GNIL14TR04415AB

4

25.3 [25.108] / 5

Front axle system - Final drive hub, steering knuckles, and shafts

Wheel hub - Adjust (4WD) - Front Axle

1. Proceed as follows:

• Install wheel hub and fixed gear unit onto the steer-

ing knuckle.

• Using a torque wrench and lock ring wrench, tool

number 380000295, progressively tighten the lock

ring to 147 - 196 N·m (108 - 145 lb ft). While tighten-

ing the lock ring, rotate the hub to seat the bearings.

• Fully loosen the lock ring and retighten to 392 N·m

(289 lb ft) while rotating hub.

• Secure the lock ring by bending over a lock washer

tab (if necessary, further tighten the lock ring to align

a slot with the tab).

GNIL14TR04378AB

1

• Turn the hub by hand to check for excessive play or

binding.

25.3 [25.108] / 6

Front axle system - Final drives

Final drive driving pinion - Preload - (4WD) Front Axle

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

Adjustment of the preload of the pinion shaft bearings

Proceed as follows:

1. Clamp tool number 380000248 (1) in the vice. Install

bearings (2), (3) and the bearing spacer (4) and tighten

the nut of the tool fully home.

NOTE: Install the 10 mm (0.394 in) thick spacer between

tool number 380000248 (1) and the bearing (2).

GNIL14TR04419AB

1

2. Using a micrometer, measure distance

(H1) be-

tween the upper surface and the pin of tool number

380000248

(1).

3. Disassemble the above parts, lubricate the bearings

with oil and then re-assemble the parts, excluding the

bearing spacer, in the bevel drive-differential housing,

complete with outer bearing races, held in place with

tool number 380000255.

GNIL14TR04420AB

2

4. Tighten the nut of tool number 380000255 (1), while

turning the tool to ensure that the bearings are seated

correctly.

5. Using a micrometer, measure the distance (H2) be-

tween the upper surface and the pin of the tool.

6. The thickness of the adjustment shim required is given

by:

Shim = H2 - H1 + 0.05 mm (0.002 in)

GNIL14TR04421AB

3

25.4 [25.310] / 3

Front axle system - Final drives

If necessary, round the value thus obtained up to the

nearest 0.05 mm (0.002 in).

Pinion positioning shim (1) is located between pinion

gear and front bearing.

NOTE: On completing the adjustment, do not remove the

adjustment tool from the bevel drive-differential housing:

leave in place for adjustment of the drive pinion position.

GNIL14TR04422AB

4

Available shim sizes

0.5 mm (0.020 in)

2.7 mm (0.106 in)

2.5 mm (0.098 in)

2.8 mm (0.110 in)

2.6 mm (0.102 in)

2.9 mm (0.114 in)

25.4 [25.310] / 4

Front axle system - Final drives

Final drive driving pinion - Adjust - (4WD) Front Axle

Determining the thickness of the drive pinion position adjustment shim

Proceed as follows.

1.

Install tool number 380000249 (1) in the bevel drive-

differential housing complete with outer bearing rings,

ring gear bearings adjustment ring, ring gear bearings

adjustment shim, circlip and differential support caps.

2.

Screw the cones (2) of tool number 380000249 (1) in or

out in order to orientate the micrometer shaft inline with

the inner bearing ring while eliminating the end play

between the cones and the outer rings of the ring gear

bearings.

3.

Adjust the micrometer so that the shaft is in contact with

inner bearing race and measure the distance (H3) thus

obtained.

GNIL14TR04423AB

1

4.

Determine the correct distance (H5) between the ring

gear axis and the large diameter base of the pinion:

H5 =H4 ± C

where:

H4 = 95 mm (3.74 in) nominal distance between the

ring gear axis and the large diameter base of the pinion.

C= correction value stamped on pinion preceded by a +

or - sign, (if other than 0), to be added to or subtracted

from the nominal distance (H4) according to the sign.

5.

The thickness of the adjustment shim will be given by:

Shim = H3 - H5

where:

H3 = the distance measured using the micrometer.

H5 = corrected nominal distance between the crown

wheel axis and the large diameter base of the pinion.

6.

Remove tool number 380000248 and tool number

380000249 from bevel drive housing.

7.

Install the drive pinion complete with: inner bearing

races, spacer and adjustment shims of the previously

determined thickness.

Pinion bearing preload shim (1) is located between

spacer and rear bearing.

GNIL14TR04424AB

2

Available shim sizes

0.5 mm (0.020 in)

2.75 mm (0.108 in)

2.5 mm (0.098 in)

2.8 mm (0.110 in)

2.55 mm (0.100 in)

2.85 mm (0.112 in)

25.4 [25.310] / 5

Front axle system - Final drives

Available shim sizes

2.6 mm (0.102 in)

2.9 mm (0.114 in)

2.65 mm (0.104 in)

2.95 mm (0.116 in)

2.7 mm (0.106 in)

8. Install the O-ring seal (1) on the drive pinion shaft.

9. Then insert the spacer and then the detent ball, after

having carefully lubricated the outer surface.

GNIL14TR04425AB

3

10.

Install the pinion lock tool, tool number 380000257 (1).

11.

Install wrench, tool number

380000268

on the

threaded adjustment ring.

12.

Using a wrench on the pinion lock tool (1), hold the

pinion against rotation, and using a torque wrench po-

sitioned exactly as shown in the figure on the threaded

adjustment ring wrench (2), tighten the adjustment

ring to a torque value of 294 N·m (217 lb ft) while si-

multaneously rotating the pinion shaft to ensure that

the bearings are seated correctly.

GNIL14TR04430AB

4

13.

With a torque wrench (1) on the pinion lock tool, tool

number 380000257 (2), check that the pinion rolling

torque, without oil seal and relative dust seal ring is

0 N·m (0 lb in) - 0.2 N·m (1.8 lb in).

If the rolling torque is less than the prescribed value,

install a thinner adjustment shim shown in Figure 2, if

the torque is greater than the prescribed value, install

a thicker adjustment shim.

14.

Unscrew the threaded adjustment ring and install the

oil seal and the dust seal ring. Tighten the threaded

ring to a torque of 294 N·m (217 lb ft), while simul-

taneously rotating the pinion shaft to ensure that the

bearings are seated correctly.

GNIL14TR04355AB

5

15.

With a inch/pound torque wrench (1) on the pinion

lock tool number 380000257 (2), check that the pinion

rolling torque with the oil seal and relative dust seal

ring is 0.5 N·m (4.4 lb in) - 1 N·m (9 lb in).

Finally, carefully stake the threaded ring and fit the

circlip on the drive pinion shaft.

25.4 [25.310] / 6

Front axle system - Non-powered front axle

Non-powered front axle - General specification

Centrally pivoted U-type centre beam without telescopic

Type

outer section

2 ° corresponding to approx. 15.00 mm (0.59 in) with

Wheel camber

406.40 mm (16.00 in) rims

Wheel toe-in

0.000 - 5.000 mm (0.000 - 0.197 in)

Swivel pin assembly

Swivel pin (3) diameter at the bushes

29.967 mm (1.180 in) / 30.000 mm (1.181 in)

Press-fit bush (4) inner diameter

30.140 mm (1.187 in) / 30.060 mm (1.183 in)

Swivel pin to bush clearance

0.060 - 0.173 mm (0.002 - 0.007 in)

Axle pivot pin assembly

Pivot pin (9) diameter

29.967 mm (1.180 in) / 30.000 mm (1.181 in)

Press-fit bush (4) inner diameter

30.140 mm (1.187 in) / 30.060 mm (1.183 in)

Pivot pin to bush clearance

0.060 - 0.173 mm (0.002 - 0.007 in)

2WD

7.50 - 16

Dished In

AC

1424.0 mm (56.1 in)

BD

1524.0 mm (60.0 in)

CE

1624.0 mm (63.9 in)

DF

1724.0 mm (67.9 in)

EG

1824.0 mm (71.8 in)

FH

1924.0 mm (75.7 in)

2WD

Dished Out

AC

1472.0 mm (58.0 in)

BD

1572.0 mm (61.9 in)

CE

1672.0 mm (65.8 in)

DF

1772.0 mm (69.8 in)

EG

1872.0 mm (73.7 in)

FH

1972.0 mm (77.6 in)

Non-powered front axle - Torque

Description

Thread size

Torque

Bolt, front axle carrier to engine (C1)

M16 x 2

22.00 kgf (48.50 lbf)

Bolt, axle pivot (C2)

M10 x 1.25

6.00 kgf (13.23 lbf)

Bolt, wheel to hub (C3)

M14 x 1.5

15.00 kgf (33.07 lbf)

Nut, track/drag link, ball joint (C4)

M10 x 1

2.50 kgf (5.51 lbf)

Nut, track/ drag link, ball joint (C5)

M14 x 1.5

10.00 kgf (22.05 lbf)

Nut, right-hand side and left-hand side control

M12 x 1.25

9.00 kgf (19.84 lbf)

lever (C6)

Axle extension securing bolts (C7)

M16 x 1.5

11.80 kgf (26.01 lbf)

25.5 [25.400] / 3

Front axle system - Non-powered front axle

GNIL14TR04431GB

1

Non-powered front axle - Special tools

Tool description

Tool number

Slide hammer for centre pin

380001545

Adapter for slide hammer

290793

Non-powered front axle - Sealing

Operation description

Specification

Front wheel hub sleeve

LOCTITE® 638™

King pin thrust washer

LOCTITE® 638™

25.5 [25.400] / 4

Front axle system - Non-powered front axle

Non-powered front axle - Sectional view

GNIL14TR04432FB

1

Front axle support

1.

Grease fitting

4.

Thrust washers

2.

Axle centre beam

5.

Axle pivot pin

3.

Axle pivot pin bushings

6.

Front axle carrier

25.5 [25.400] / 6

Front axle system - Non-powered front axle

GNIL14TR04433GB

2

Stub assembly

1.

Dust cover

11. Grease nipple

2.

Oil seal

12. Bearing

3.

Bush upper

13. Thrust washer

4.

Bush lower

14. Castle nut

5.

Thrust washer

15. Split pin

6.

Seal

16. Dust cover

7.

Dust cover

17. O-ring

8.

Bush (sleeve)

18. Thrust washer pin

9.

Seal

19. Grease nipple

10. Bearing

20. King pin

25.5 [25.400] / 7

Front axle system - Non-powered front axle

Non-powered front axle - Remove

DANGER

Heavy objects!

Lift and handle all heavy components using lifting equipment with adequate capacity. Always support

units or parts with suitable slings or hooks. Make sure the work area is clear of all bystanders.

Failure to comply will result in death or serious injury.

D0076A

Remove the front axle assembly from the tractor as fol-

lows:

1. Open and raise front hood.

2. Disconnect the negative cable from the battery and in-

sulate.

3. Safely block rear wheels.

4. Remove front weights and weight support, where fitted.

5. Jack up front tractor and place a stationary stand (1)

under the sump.

GNIL14TR04434AB

1

6. Loosen retaining bolts (1) and remove the front wheels.

GNIL14TR04435AB

2

7. Remove knuckle joint nut (1) and disconnect drag link

(2) from control lever.

GNIL14TR04436AB

3

25.5 [25.400] / 8

Front axle system - Non-powered front axle

8. Remove the axle pivot pin locking bolt (1).

GNIL14TR04437AB

4

11. Using a slide puller (special tool number 292927)

with tool no. 380001545 withdraw the pivot pin (1).

10. Recover thrust washers and shims provided be-

tween axle carrier and centre beam.

11. Remove front axle from tractor using a hoist.

GNIL14TR04438AB

5

25.5 [25.400] / 9

Front axle system - Non-powered front axle

Front axle - Remove - Spindle Assembly

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

Swivel pins can be removed and overhauled with the

front axle on the tractor proceed as follows for each

wheel:

1. Safely block rear wheels.

2. Jack up front tractor and place a stationary stand (1)

under the sump.

3. Loosen retaining bolts and remove front wheels.

GNIL14TR04449AB

1

4. Remove swivel pin control lever retaining bolt (1).

5. Slide out the control lever (2) from the spindle assem-

bly.

GNIL14TR04450AB

2

6. Pull out the swivel axle and hub assembly (1) from axle

outer section.

GNIL14TR04451AB

3

25.5 [25.400] / 11

Front axle system - Non-powered front axle

7. Remove the axle outer section (1) attaching bolts.

GNIL14TR04452AB

4

8. Remove the axle outer section (1).

GNIL14TR04453AB

5

25.5 [25.400] / 12

Front axle system - Non-powered front axle

Front axle - Overhaul - Spindle Assembly

1. Fix the axle outer section in a vice and remove the

upper seal using suitable tool.

GNIL14TR04454AA

1

2. Remove the bottom seal using suitable tool and recover

thrust washer.

3. Check the swivel bearing bushes for wear. See spec-

ifications in Non-powered front axle - General spec-

ification (25.400). If bushes require replacement, re-

move the bushes using suitable tool.

4. Using a suitable drift install new bushings on the axle

outer section.

5. Check the swivel pin for wear. If required replace new

spindle.

6. Ream the new bushings to suit the swivel pin.

GNIL14TR04455AA

2

25.5 [25.400] / 13

Front axle system - Non-powered front axle

Front axle - Install - Spindle assembly

Reinstall the spindle assembly to the front axle following

the disassembly procedure in reverse.

NOTE: Make sure that the slot (1) in the thrust washer fits

on the notch provided on the axle outer section.

GNIL14TR04456AB

1

25.5 [25.400] / 14

Front axle system - Non-powered front axle

Axle wheel hub - 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

Wheel hubs can be removed with the front axle on the

tractor. Proceed as follows for each hub.

1. Safely block rear wheels.

2. Jack up front tractor and place a stationary stand (1)

under the sump.

3. Loosen retaining bolts and remove front wheels.

GNIL14TR04439AB

1

4. Remove wheel hub bearing grease cup (1).

GNIL14TR04440AB

2

5. Remove split pin (1).

GNIL14TR04441AB

3

25.5 [25.400] / 15

Front axle system - Non-powered front axle

6. Using the socket spanner loosen the wheel hub bear-

ing. Adjust castle nut.

GNIL14TR04442AA

4

7. Remove wheel hub (2) and recover bearing (1) and (3).

GNIL14TR04443AB

5

8. Remove seal (1) and nyloc ring (2) using suitable tool.

GNIL14TR04444AB

6

25.5 [25.400] / 16

Front axle system - Non-powered front axle

Axle wheel hub - Install

1. Replace faulty seals and worn bearing using suitable

pullers and drifts.

2. Fill the wheel hub with specified grease.

3. Re-assemble the wheel hub (2) complete with the bear-

ings (1) and (3).

GNIL14TR04445AB

1

4. Using a torque wrench and socket spanner (1) tighten

the castle nut while turning the wheel hub (1) to set-

tle the bearing. Tighten the nut until wheel hub gets

slightly tight to rotate.

5. Loosen the castle nut and torque it again to 9.8 N·m

(7.2 lb ft) continuing to turn the wheel hub.

GNIL14TR04446AA

2

6. Insert split pin (1).

GNIL14TR04447AB

3

7. Reassemble the wheel hub dust cap (1).

NOTE: Check the O-ring provided on the dust cap for any

cut or damage. If required replace the O-ring.

GNIL14TR04448AB

4

25.5 [25.400] / 17

Front axle system - Non-powered front axle

Non-powered front axle - Troubleshooting

Problem

Possible Cause

Correction

Premature tire wear

Wrong inflation pressure

Inflate tyres to correct pressure refer to val-

ues suggested in the operator’s manual.

Always comply with values specified by the

tire manufacture

Wrong front wheel toe-in

Adjust toe-in (see the procedure explained

in this section under adjustment)

Poor tractor stability

Wrong inflation pressure

Inflate tyres to correct pressure

25.5 [25.400] / 18

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