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Massey Ferguson 6475 Tractor steering ram

Removing and install the 2 WD steering ram

Immobilise the Massey Ferguson 6475, 6470, 6455 Tractor. Chock the rear wheels. Apply the handbrake.

Fig.43

If necessary, remove the front wheel(s). Place one or more safety stand(s).

Disconnect and block off the left- and right-hand ram supply hoses, carefully identifying their positions.

Drive out the ball joints (1) from the steering arms using a suitable extractor. Loosen the screws (2).

Remove the ram with its link rods (3) and ball joints (7). If necessary, split the link rods and O’rings from the ram.

If removed, assemble onto the ram:

- the ball joints (7);
- the link rods (3).

Install the complete ram.

Lightly smear the thread of the screws (2) with Loctite 270 or equivalent. Fit and tighten these screws, with their washers, to a torque of 120 Nm.

Attach the steering ball joints (1). Fit and tighten their locknut (4) to a torque of 115 - 130 Nm.

Reconnect the left- and right-hand ram supply hoses, in their initial positions.

If removed, refit the wheel(s). Remove the safety stand(s). Tighten the wheel studs to a torque of 200 - 260 Nm.

Remove the chocks from the rear wheels. Carry out a road test on the MF 6475, 6470, 6455 Tractor steering system. Check the oil tightness of the hydraulic unions.

Removing - install and disassembling - assembling the CARRARO 4 WD steering ram

Immobilise the tractor. Chock the rear wheels. Apply the handbrake.

Fig.44

Take off the front left-hand mudguard and wheel.

Disconnect and block off the left and right-hand ram supply hoses, carefully identifying their positions.

Drive out the ball joints (1) from the steering arms using a suitable extractor. Loosen the screws (2).

Remove the ram with its link rods (3) and ball joints (7). If necessary, split the link rods and O’rings from the steering ram.

If removed, assemble onto the ram:

- the ball joints (7);
- the link rods (3).

Install the complete Massey Ferguson 6470, 6475, 6455 Tractor steering ram.

Lightly smear the thread of the screws (2) with Loctite 270 or equivalent. Insert and tighten these screws, with their washers, to a torque of 120 Nm.

Fix the steering ball joints (1). Insert and tighten their locknut (4) to a torque of 220 Nm.

Reconnect the left and right-hand ram supply hoses, in their initial positions.

If removed, refit the mudguard and wheel. Remove the safety stand. Tighten the wheel nuts to a torque of 640 - 680 Nm.

Disassembly steering ram

Remove the steering ram (see previous operations).

Loosen and remove the ball joints (7) using a suitable wrench.

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

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

Systematically discard all the sealing rings, seals and dust guards.

Fig.45. Parts list

(1) Ram assembly (2) Pack of seals (4) Cylinder (6) Rod/piston (7) Cover

Reassembly MF 6475, 6470, 6455 Tractor steering ram

Clean the components. Replace any defective parts.

Check the surface condition:

- of the inner cylinder bore;
- of the rod/piston functional parts.

Systematically discard scratched parts that may lead to steering ram leaks.

Lubricate with clean transmission oil:

- the new rings and joints;
- the inner cylinder bore;
- the rod/piston.

Carefully fit the joints on:

- the rod/piston (6);
- the cylinder (4);
- the cover (7).

Reassemble the Massey Ferguson 6475, 6470, 6455 Tractor steering ram without damaging the oil tight seals.

For this purpose:

- slide the rod/piston, with its seals, into the cylinder;
- put the cover back on the cylinder, with the pressure inlet facing the right direction.

Screw on the ball joints (7). Tighten to a torque of 300 Nm. Install the steering ram.

If necessary, check the pressure at the ram hydraulic ports.

Carry out a road test on the steering system. Check the oil tightness of the ram and hydraulic unions.

Removing - refitting and disassembling - reassembling the DANA 4 WD steering ram

Fig.46

Immobilise the tractor. Chock the rear wheels. Apply the handbrake.

If access to steering ram fixing screws (2) seems difficult:

- raise the front of the tractor with a trolley jack placed in the centre of the front axle;
- remove the front wheels;
- place a suitable axle stand beneath the lower engine housing;
- swing the front axle at maximum to high and low positions in order to access the screws.

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

Drive out the ball joints (1) from the steering arms using a suitable extractor.

Loosen the screws (2). Remove the steering ram.

Install the steering ram.

Lightly smear the thread of the screws (2) with Loctite 270 or equivalent. Tighten these screws to a torque of 180 - 200 Nm.

Fix the steering ball joints (1). Tighten their locknut (4) to a torque of 115 - 130 Nm. Lock the nuts (4) using new pins.

Reconnect the steering ram supply hoses, in their initial positions.

If removed, refit the wheels. Tighten the wheel nuts to a torque of 400 - 450 Nm.

Disassembly MF 6470, 6475, 6455 Tractor steering ram

DANA front axles are fitted with a double acting steering ram. It receives pressure from the steering unit as a function of 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 steering ram. Release and remove the ball joints (7).

Take off the lock rings (5) using a suitable locally made tool, while simultaneously turning the guide rings (3).

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

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

Fig.47. Parts list

(1) Ram assembly (2) Pack of seals (3) Guide rings (4) Cylinder (5) Lock rings (6) Rod/piston

Assembly Massey Ferguson MF 6475, 6470, 6455 Tractor steering ram

Clean the components. Replace any defective parts.

Check the surface condition:

- of the inner cylinder bore;
- of the rod/piston functional parts.

Systematically discard scratched parts that may lead to steering ram leaks.

Lubricate with clean transmission oil:

- the O'rings;
- the rings;
- the inner cylinder bore.

Install the concerned seals on:

- the rod/piston (6);
- the guide rings (3).

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

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

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

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

Install the steering ram on the tractor.

Check the ram supply and tightness.

Carry out a road test on the steering system.