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Repair of Massey Ferguson 8240 Tractor steering rams

Removing, refitting and disassembling, reassembling the Dana and Carraro steering rams

- MF 8210, 8240 tractors are now equipped with a Carraro front axle.

- MF 8260 tractors are equipped with a Dana AG200H front axle with an elevated pivot.

Preliminary operation

Immobilise the tractor. Chock the rear wheels. Put on the handbrake.

- If access to the ram fixing bolt (2) in the Dana front axle seems difficult (Fig. 51):
- lift the front of the tractor with a trolley jack positioned in the centre of the front axle,
- remove the front wheels,
- place an appropriate axle stand beneath the lower engine housing,
- swing the front axle at maximum to high and low positions in order to access the bolts.

Removal (Fig. 51-52)

Carraro front axle

Remark - To help clear the Massey Ferguson 8240, 8210, 8260 tractor steering ram on the Carraro front axle, first remove the mudguard and the front left wheel of the tractor.

Dana or Carraro front axle

Disconnect and block off the feed hoses to the ram, carefully identifying their positions.

Drive out the steering ball joints (1) using an appropriate extractor.

Take out the bolts (2) from the ram and remove it: Dana front axle (Fig. 51) / Carraro front axle (Fig. 52)

Refitting

Refit the ram. Fit and tighten bolts (2):

- Dana front axle: to a torque of 180 - 200 Nm, the threads previously smeared with Loctite 270 or equivalent.
- Carraro axle: to a torque of 120 Nm.

Fix the steering ball joints. Tighten bolts (4):

- Dana front axle: to a torque of 115 - 130 Nm and block them with new pins (Fig. 51)
- Carraro front axle: to a torque of 220 Nm (Fig. 52)

Reconnect the feed hoses in the positions identified during disassembly.

Mount the wheel(s) and tighten the bolts to a torque of 640 - 680 Nm.

Refit the mudguard (Carraro front axle).

- The Dana or Carraro front axles are fitted with a doubleacting cylinder, which receives pressure from the Orbitrol spool valve proportional to the rotation of the steering wheel.

- When one side of the ram is fed, the other is connected to the return pipes and vice versa.

- Each component can be replaced and is listed in the spare parts catalogue.

- A pack provides all the seals necessary for carrying out service operations.

Remove the MF 8240, 8210, 8260 tractor steering ram.

Dana front axle (Fig. 53)

Release and remove the spherical joints (7) (Fig. 51).

Take off the lock rings (5) using an appropriate locally manufactured tool, while simultaneously turning the guide bushes (3).

Take out the piston rod (6) from cylinder (4).

Discard all the seals (sealing ring, O’rings, dust guards and lock rings).

Carraro front axle (Fig. 54)

Release and remove the spherical joints (7) (Fig.52).

Separate the cover (7) from the cylinder (4).

Take out the piston rod (6) from cylinder.

Discard all the seals (sealing ring, O’rings, dust guards and lock rings).

Reassembly

Dana or Carraro front axle

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

Check the condition of the internal bore of the cylinder and the operational parts of the piston rod.

Systematically discard all scratched components that may compromise the oil tightness of the Massey Ferguson 8240, 8210, 8260 tractor steering mechanism.

Dana front axle (Fig. 53)

Lubricate the O’rings, bushes and internal bore with clean transmission oil.

Fit the relevant seals on the piston rod (6) and the guide bushes (3).

Slide the piston rod fitted with its seals into the cylinder bore.

Fit the guide bushes at each end of the cylinder, taking care not to damage the lip of the sealing rings.

Position the machined groove of each guide bush opposite the cylinder groove. Turn the guide bushes while simultaneously slipping in the lock rings.

Tighten and block the spherical joints (7) (Fig. 51) to a torque of 120 - 150 Nm, the threads previously smeared with Loctite 270 or equivalent.

Carraro front axle (Fig. 54)

Lubricate the seals, bushes and cylinder internal bore with clean transmission oil.

Fit the seals on the piston rod (6) cylinder (4) and the cover (7) respectively.

Put together the Massey Ferguson MF 8240, 8210, 8260 tractor steering ram without damaging the oil tight seals :

- by sliding the piston rod fitted with its seals in the cylinder bore
- by putting back the cover on the cylinder, with the pressure inlet facing the right direction.

Tighten and block the spherical joints (7) (Fig. 52) to the torque of 300 Nm.

Dana or Carraro front axle

Refit the steering ram on the tractor.

Check the supply of the ram and its internal oil tightness.

Carry out a road test on the steering system.