________________________________________________________________________________

Massey Ferguson 7495, 7499 hydraulic right-hand cover - Idler pinion and pump bearing block

MF 7400-7700 Series Tractors Repair Operations

Disassembling, reassembling and shimming of the idler pinion

Disassembly

Remove the Massey Ferguson 7499, 7495 variable displacement pump.

Unlock and remove bolts (75). Take out pin (83) and pinion (82) and pair together the bearing cones and cups (77) (78) if they are to be reused. Recover the shim(s) (79) and spacer (81). On the pinion, remove the bearing cups (78) and circlips (80).

Reassembly

Place the bearing cups (78) thrust against the previously fitted circlips. Reassemble the turning hub of the idler pinion (82) by assembling the bearing cones (77), spacer (81), the shim(s) and pin (83).

If required, carry out the shimming of the idler pinion. Otherwise continue the reassembly operations. Assemble the pinion and pin on the cover.

Degrease the threads of bolt (75) and lightly smear it with Loctite 241 or its equivalent. Fit washer (76) and tighten the bolt to a torque of 100 - 130 Nm. Manually check the rotation of the pinion.

Parts concerned by shimming

- The pinion (82), the circlips (80), the bearing cones and cups (77) (78) and spacer (81).

- The clearance of the taper roller bearings is adjusted by shim(s) (79) placed between the front cone (77) and spacer (81).

- To carry out the correct shimming of the bearings, place the cover in a vice with the pump pinion (39) protruding as shown in Figure.

Shimming

Place the index of the dial gauge on the pinion (82). Push the pinion strongly downwards, alternatively turning the pinion left and right in order to correctly seat the cone in the bearing cup.

Reset the dial gauge to zero. Repeat the operation, this time pulling on the pinion instead of pushing. Depending on clearance measured, select a thickness of shim (s) in order to provide a clearance of: J1 = 0.03 to 0.13 mm.

Wherever possible, shim the bearings to the minimum clearance. Fit the definitive shim(s) selected in operation. Degrease the threads of bolt (75) and lightly smear the threads with Loctite 241 or its equivalent.

Fit washer (76) and tighten the bolt to a torque of 100 - 130 Nm. Manually check the rotation of the pinion.

Removing and refitting – Disassembling and reassembling the pump bearing block

- Place the rear wheels in the wide track position.
- Uncouple the MF 7495, 7499 tractor between the gearbox and the intermediate housing.
- Remove the creeper unit components (if fitted).
- Free the ratchet of the Park Lock (if fitted). Take out the toothed sleeve after carefully noting its position.

Removal

Immobilise pinions (1) (82) using a bronze drift. Take out bolts and extract pinion. Take out plug (8).

Using a threaded rod screwed into the threaded hole in locating pin (7), pull on it so as to free spacer (5).

Through the front opening of the intermediate housing, pull on the bearing block to disengage it from the bore of the housing.

Refitting

Check that the hydraulic channels and ports of the spacer are not obstructed. Refit the bearing block.

Carry out operation in reverse order. Place the groove of the spacer in the axis of the port provided for the plug (8). Fit the locating pin, with the flats lodged in the groove in the spacer. Tighten the plug.

Check that the bearing block assembly is correctly positioned and that it turns normally.

Fit pinion (1). Tighten bolts (4) previously smeared with Loctite 241 or its equivalent to a torque of 72 - 96 Nm.

Disassembly

Remove the bearing block.

Take off circlip (10).

Extract bearings (6) and recover spacer (5).

Reassembly

Clean and check the components. Replace any parts found to be defective.

Using a press and an appropriate fixture insert bearings (6), placing spacer (5) between them.

Fit circlip (10). Check for the presence of circlip (12) on the upper shaft of the power take off. Refit the bearing block and fit the pinion.

- The union (9) has a calibrated port for the lubrication of bearings (6).
- If fitted, unclamp the ratchet and position the sleeve of the Park Lock.
- The long part of the ratchet must face the drive pinion.
- Refit and adjust the creeper unit components (if fitted).
- Couple the MF 7495, 7499 tractor between the gearbox and the intermediate housing.
- Replace the wheels in their initial positions. Tighten the wheel nuts or studs.
- Check the operation of all the controls.
- Carry out a road test.
- Check the oil tightness of the mating faces and hydraulic unions.