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New Holland Tractor Workmaster 50 / Workmaster 60 / Workmaster 70 / Tier 4B (final). SERVICE MANUAL - page 10

Brakes and controls - Mechanical service brakes

Mechanical service brakes - Remove

To remove brake assembly, rear axle assembly has to

be removed from the transmission.

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

GNIL14TR00789AA

1

2. Wrap chain around final drive housing and loosen bolts

(1). Remove the final drive housing.

GNIL14TR04276AB

2

3. Place the trumpet housing assembly on plane surface.

GNIL14TR04336AA

3

4. Remove the linkage (1).

GNIL14TR00792AA

4

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Brakes and controls - Mechanical service brakes

5. Remove the nut and spring. Remove the circlip.

GNIL14TR00791AA

5

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

GNIL14TR04277AB

6

7. Remove the brake actuator assembly (1).

GNIL14TR04278AB

7

8. Remove second brake disc.

GNIL14TR00779AA

8

33.1 [33.120] / 10

Brakes and controls - Mechanical service brakes

9. Remove intermediate plate and third brake disc.

GNIL14TR00780AA

9

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

GNIL14TR04279AB

10

33.1 [33.120] / 11

Brakes and controls - Mechanical service brakes

Mechanical service brakes - Install

NOTE: Always use suitable tools to align holes. Do not use hand or fingers.

1. Reinstall the brake assembly and rear axle housing to

the differential housing taking the following into consid-

eration.

• Reassembly follows the disassembly procedure in

reverse, form step 5 back to step 1.

• Refer to figure to orient the different parts.

• Use special tool number 84261390 to fit the brake

rubber boot in the brake linkage groove and

brake rubber brake boot with special tool number

84261391 in trumpet housing.

GNIL14TR04340AA

1

• Before reinstalling the rear axle housing, thoroughly

clean and degrease mating surfaces and apply a

bead of liquid gasket of approx. 2.000 mm (0.079 in)

of diameter.

• Check seals for wear and damage and replace if

necessary.

• Tighten to correct torques.

After brake assembly fitted in differential housing, check

brake discs for free movement between brake discs.

GNIL14TR04341AA

2

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Brakes and controls - Mechanical service brakes

GNIL14TR04342FA

3

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Brakes and controls - Mechanical service brakes

Brake control pedals and shafts - Remove

1. Remove circlip (1). Unlock the clip (2) and remove pin

(3) from the left-hand and right-hand side brake link-

ages.

GNIL14TR00766AA

1

2. Remove the brake pedal springs. Remove the clutch

pedal springs.

GNIL14TR00782AA

2

3. Remove the conical screw (1) that locks the brake

shaft.

GNIL14TR00812AA

3

4. Slide out both left-hand and right-hand side brake ped-

als (1) from brake shaft (2).

GNIL14TR04332AB

4

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Brakes and controls - Mechanical service brakes

Parking brake linkage removal

5. Remove split pin from hand brake linkage.

6. Pull out hand brake lever along with linkage rod from

the linkage assembly.

GNIL14TR04333AA

5

7. Loosen the bolt (1) and remove hand brake pawl (2).

GNIL14TR04334AB

6

33.1 [33.120] / 16

Brakes and controls - Mechanical service brakes

Brake control pedals and shafts - Adjust

1. Measure free play of the brake pedals as shown in 1

and should be 50.00 - 55.00 mm (1.97 - 2.17 in). With

the brake pedals locked together, the tractor should

stop in a straight line when brakes are applied.

2. Adjustment is made to the brake pull rods beneath the

tractor. Block the wheels, front and rear, unlock the

brake pedals and release the parking brake lever. Re-

lease locking clamp, loosen locknut (1) and rotate the

yoke (2) clockwise to reduce the play and anti-clock-

wise to increase the play figure 2.

3. Repeat the same procedure for the left brake pull rod.

4. Lock the brake pedals together and road test to ensure

GNIL14TR04343AA

1

that the brakes are balanced and will stop the tractor

in a straight line. Any further adjustment necessary to

balance the brakes should be carried out on the right

brake.

GNIL14TR00766AA

2

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Brakes and controls - Mechanical service brakes

Mechanical service brakes - Troubleshooting

Problem

Possible Cause

Correction

Brake actuate only when

Incorrect Pedal adjustment

Check and adjust

pedal is depressed fully

Tractor pulls to one side

Brakes not equally adjusted

Adjust

when brakes applied

Wrong tire pressure

Inflate tires to correct pressure

Wrong liners on one side

Replace discs

Brakes noisy

Oil contamination

Check and change with recommended oil.

Wrong brake disc

Replace brake discs.

Brakes remain applied

Seized brake actuating linkages

Clean and lubricate linkages

when pedals are released

Pedals are hard to operate

Seized brake actuating linkages

Clean and lubricate linkages

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Hydraulic systems - Hydraulic systems

Hydraulic systems - Hydraulic schema

GNIL14TR00817GA

1

Schematic view of hydraulic system

(1) Hydraulic pump

(4) Delivery line

(2) Hydraulic filter

(5) Oil sump (transmission housing)

(3) Suction line

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Hydraulic systems - Hydraulic systems

GNIL14TR00818GA

2

Hydraulic circuit diagram

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Hydraulic systems - Hydraulic systems

Hydraulic systems - Component identification

Pump

Open centre hydraulic pump assembly is of high pressure

gear pump (1).

GNIL14TR00519AA

1

Filter

Full-flow spin on type filter (1) mounted on right side of the

engine on suction pump.

GNIL14TR00519AA

2

Mechanical hydraulic lift assembly

Mounted on top of transmission housing comprising of following components:

• Position control lever (1)

• Draft control lever (2)

GNIL14TR00580AA

3

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Hydraulic systems - Hydraulic systems

• Distributor (3)

• Response control valve (4)

GNIL14TR00804AA

4

• Draft sensing unit (8)

• Lift arms (9)

• Internal linkages and cylinder assembly

GNIL14TR04568AB

5

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Hydraulic systems - Hydraulic systems

Hydraulic systems - Troubleshooting

Problem

Possible Cause

Correction

Lift arms lift jerky

Hydraulic oil level low

Add hydraulic oil to correct level

Suction Filter is clogged

Replace oil filter

Pump has an air suction leak

Check all inlet pipe connections

Lift arms do not lift

Inner control valve spool not shifting to

Remove control valve and clean spool

open position

Regulator valve not shifting

Remove and clean regulator valve

Lift arms do not lower

Discharge valve blocked

Remove discharge valve and clean

Lowering response valve closed

Open lowering response valve by turning

counterclockwise

Lift arms do not lower full

Incorrect adjustment of the position control

Adjust position control lever

travel

lever

Control valve sensitivity adjustment not ad-

Adjust control valve sensitivity

justed correctly

Low lift capacity

Damaged control valve outer diameter

Replace O-rings as necessary

O-rings

Relief valve not adjusted correctly

Adjust relief valve to specification

Worn lift cylinder piston seal

Replace damaged seal

Lift arms cycle up and

Lift cylinder piston seal damaged

Replace piston seal

down with load applied

with engine running

Discharge valve not adjusted correctly

Adjust sensitivity of control valve

Lift check valve not seating properly

Inspect lift check valve for contamination

Safety valve not seating properly

Inspect safety valve for contamination

Lift arms leak down when

Lift cylinder piston seal damaged

Replace piston seal

engine is not running

Discharge valve not adjusted correctly

Adjust sensitivity of control valve

Lift check valve not seating properly

Inspect lift check valve for contamination

Safety valve not seating properly

Inspect safety valve for contamination

When lift arms are at

Position control lever maximum height po-

Adjust position control lever maximum po-

maximum lift height, with

sition not adjusted correctly

sition setting

the engine running, the lift

arms cycle up and down

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Hydraulic systems - Main lift system

Main lift system - General specification

With separate position or draft control, Mixed position/draft control

Type

plus draft sensitivity and float control

Control

Through two independent levers external knob on control valve

Response/drop rate adjustment

Through external knob on control valve

Single-acting cylinder

85.0 mm (3.3 in) x 88.0 mm (3.5 in) for 1100.0 kg (2425.1 lb)

• Bore and stroke

90.0 mm (3.5 in) x 117.0 mm (4.6 in) for 1500.0 kg (3306.9 lb)

500 cm³ for 1100.0 kg (2425.1 lb)

• Displacement

745 cm³ for 1500.0 kg (3306.9 lb)

Pressure regulating valve setting

190 bar (2755 psi)

Cylinder safety valve opening pressure

205.0 bar (2972.5 psi)

Implement attachment

Type

3-Point hitch

Category

I & II

Draft control

Through top link

Maximum lifting capacity at hitch point

1100 kg (2425 lb) and 1500.0 kg (3306.9 lb) for heavy duty

Main lift system - Torque

Description

Thread size

Torque

Bolts, lift to housing (C1)

M10 x 1.25 and M12 x 1.25

23.6 - 42.0 kgf (52.0 - 92.6 lbf)

Bolts, distributor to lift housing (C2)

M8 x 1.25

3.0 kgf (6.6 lbf)

Banjo bolts, delivery pipe to distributor (C3)

M22 x 1.25

7.5 kgf (16.5 lbf)

Hydraulic cylinder to lift housing (C4)

M12 and M14 x 1.25

7.5 kgf (16.5 lbf)

Bolts, top link support (C5)

M8 x 1.25

5.0 kgf (11.0 lbf)

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Hydraulic systems - Main lift system

GNIL14TR00819GA

1

Main lift system - Sealing

Operation description

Sealant specification

Lift housing to transmission housing (S1)

LOCTITE® 518™

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Hydraulic systems - Main lift system

GNIL14TR04583FB

1

Main lift system - Special tools

Tool description

Tool number

Installer, lift arm seal with protector

9970873

Socket for spool height adjustment

9970874

Adapter hydraulic pressure checking

9970877

35.2 [35.100] / 5

Hydraulic systems - Main lift system

Main lift system - Dynamic description

Control levers

A) Position control

B) Draft control

C) Combined operation for position and draft control

The above operations may be chosen in consideration of the work to be carried out, the implement type and the soil

superficial hardness.

GNIL14TR04603FB

1

Position control

Move the draft control lever (2) fully down. Fix the implement position, inside or outside the soil, by moving the lever

(1) up for raising and down for lowering.

The implement movement is proportional to the movement range fixed by means of lever (1).

Draft control

Move the position control lever (2) fully down, have the implement penetrated into the ground till reaching the desired

depth by gradually moving the lever (2) down.

The implement depth reached is proportional to the draft determined by soil hardness.

In this condition the rock shaft keeps the draft required automatically constant.

Once the draft is regulated at the end of the rope is possible to lift the implement with position lever (2) in order to

keep in memory the draft.

During last movement stroke of lever (2) a floating function is obtained and the rock shaft does not control the draft.

35.2 [35.100] / 6

Hydraulic systems - Main lift system

Combined operation for position and draft control

In case of workings carried out under draft control on not-homogeneous soils, during which excessive implement

penetration may occur, it is convenient to use the combined position and draft control.

Have the implement penetrated into the ground and search for the desired working depth in the way described for the

draft control.

When the desired depth is reached, gradually move up the lever 1 till the lower links slightly start raising.

The rock shaft operates under controlled draft, but at the same time it prevents the implement from excessively pen-

etrating into the ground causing a not very uniform work, when coming up against a less hard ground.

For raising and moving the implement penetrated at the end and beginning of each pass, acting on position lever 1

only.

NOTE: It is not correct to find the position with the draft lever 2 because the lifting and lowering of arms with this lever

changes with the top link position.

This can be on neutral-positive-negative-position depending on the draft force, or to change the force on the top link

bracket as per the implement weight.

Internal linkage system

A) Functioning of position control

B) Functioning of draft control

C) Combined functioning of position and draft control

Functioning of position control

GNIL14TR04600FB

2

See 2.

35.2 [35.100] / 7

Hydraulic systems - Main lift system

By positioning the draft control lever (2) against the backstop. The roller (11) which slides on the flywheel (7) of draft

cam (12), will be moved away completely.

In this way the draft levers will not in anyway interfere with the operation of the position control.

The arms are raised by moving the position control lever (1) upward, and the leverage system will act in the following

way.

Crank (4) being an integral part of shaft (3) turns in a clockwise direction and causes roller (5) to slide on the position

cam (6), in turn causing the clockwise rotation of flywheel (7). The flywheel will transmit an anti clockwise rotation,

by means of friction shock absorber (8) to the transmission lever (9) that will bring distributor shaft (21) into delivery

position (C), thus causing the arms to be lifted.

During the lifting movement of the arms, crank (13) with pin (10) will rotate in an anti-clockwise direction, and by

means of the link (14) will cause position cam (6) to rotate clockwise.

When the roller (5) meets the inclined plane of the cam (6), it allows the anti-clockwise rotation of the flywheel (7)

that by means of a friction shock absorber (8) rotates the lever (9) in a clockwise direction, which is pushed by the

spring of the control valve shaft (21) which moves to position (N) (neutral phase) and thus blocking the movement of

the lifting arms.

During the lowering phase of the arms the movements of the levers indicated above will occur in the opposite sense.

The position of the arms, during lifting and lowering, correspond to a specific position of the position control lever (1).

Functioning of draft control

GNIL14TR04601FB

3

See 3.

By positioning the control lever (1) for position control against the backstop. The crank (4) reaches its maximum

position of anti-clockwise rotation. In said position the roller (5) is totally lowered from the inclined plane of position

cam (6) allowing the anti-clockwise rotation of flywheel (7) as well as the clockwise rotation of the transmission lever

35.2 [35.100] / 8

Hydraulic systems - Main lift system

Combined functioning of position and draft control

GNIL14TR04602FB

4

To utilise the lifting device in this condition it is necessary to observe the following instructions:

• Move the position control lever (1) upwards with respect to the backstop (E) until the maximum working depth has

been attained.

• Determine the desired minimum working depth by operating the draft control lever and raising it from its zero position

so that roller (11), acting on the draft cam (12) will move the distributor shaft (21) into the lifting position (C) and

causing a further upward movement of the lifting arms.

Due to the position previously established by position control lever (1), flywheel (7), roller (4) and position cam (6),

the distributor shaft (21) is prevented from entering the lowering position (S) and therefore the arms cannot sink even

though the traction force acting on the top link point (20) will tend to diminish and putting stress on the tension rod

(18) in the direction of arrow (-) (negative).

This condition will not prevent the rock shaft from operating with the draft control when, in the presence of more

consistent soil, the traction force on the top link (20) will tend to increase, exerting pressure on the tension rod (18) in

the direction of arrow (+) (positive).

Consequently the combined operation of position and draft control will limit variations in height towards the ground,

as happens during the use of the draft control, and at the same time ensuring the maximum possible depth desirable.

35.2 [35.100] / 10

Hydraulic systems - Main lift system

Main lift system - 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

Remove the hydraulic lift from the rear axle housing as

follows:

1. Remove three-point linkages (top link, lower link and lift

rod) from the tractor.

76099304N

1

2. Disconnect delivery pipe and return pipe from the lift

assembly.

GNIL14TR00800AA

2

3. Disconnect the wiring coupler. Loosen the bolts (1).

Remove the operator’s seat from the hydraulic lift.

GNIL14TR04607AB

3

35.2 [35.100] / 11

Hydraulic systems - Main lift system

4. Loosen the bolts securing hydraulic lift housing to trans-

mission housing.

5. Lift the hydraulic lift assembly using suitable hoist and

place it on a flat surfaced table.

NOTICE: Never lift the housing by holding distributor knobs

and delicate parts.

GNIL14TR00799AA

4

35.2 [35.100] / 12

Hydraulic systems - Main lift system

Main lift system - Install

CAUTION

Pinch hazard!

Always use suitable tools to align mating parts. DO NOT use your hand or fingers.

Failure to comply could result in minor or moderate injury.

C0044A

Refit the hydraulic lift on the transmission housing as

follows.

1. Re-installation follows the removal procedure in re-

verse

2. Before refitting the hydraulic lift in the rear transmission

casing, clean and degrease the mating surfaces thor-

oughly and apply a strip of sealing compound of about

2.00 mm (0.08 in) diameter as shown in the figure.

3. Apply the torque settings.

GNIL14TR04609AA

1

35.2 [35.100] / 13

Hydraulic systems - Main lift system

Main lift system - 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

NOTE: Draft sensing unit and related external linkages can be disassembled and assembled with the lift unit mounted

on the tractor.

Draft sensing unit - Removal

1. Loosen the bolts (1) from the sensing unit.

GNIL14TR04617AB

1

2. Remove the lock (1) and remove draft link (2).

GNIL14TR04618AB

2

3. Loosen bolts (1) and set screw.

4. Remove the pin as shown in figure.

5. Remove the sensing unit from the lift housing.

GNIL14TR04619AB

3

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Hydraulic systems - Main lift system

Draft sensing unit - Disassembly

6. Loosen set screws (1).

GNIL14TR04621AB

4

7. Disassemble roller (2), springs (3), cover (4), flange (5)

from the sensing unit.

Rear lift internal controls removal

8. Remove the lift assembly from the transmission hous-

ing and fix on a rotary stand. See Main lift system -

Remove (35.100).

GNIL14TR04642AA

5

9. Loosen the set screws (1).

GNIL14TR04624AB

6

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Hydraulic systems - Main lift system

10. Remove the cylinder (1) from hydraulic lift housing.

GNIL14TR04625AB

7

NOTE: Retrieve the seal (1) from head of cylinder.

GNIL14TR04626AB

8

11. Remove the piston (1) from the cylinder by pushing

with a suitable aluminium rod from the front side.

GNIL14TR04627AB

9

12. Remove locks and disassemble lever (1).

GNIL14TR04631AB

10

35.2 [35.100] / 16

Hydraulic systems - Main lift system

13. Remove linkage (1).

GNIL14TR04633AB

11

14. Remove the lock (1) from the compensator pin.

GNIL14TR04632AB

12

15. Unscrew the compensator pin until face of the pin

comes out of the compensator.

GNIL14TR04634AB

13

16. Remove linkages as shown in figure.

GNIL14TR04635AB

14

35.2 [35.100] / 17

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