Split the tractor between Intermediate housing and Centre housing


Available equipment fits:

- Tractors with Powershift transmission AG150
- Tractors with Power-shift transmission AG250
- Tractors with Heavy transmission.  The cab will remain integral with the gearbox.
Disassembling the intermediate housing from the centre housing allows working on the following items: drive pinion, ring gear, differential and housings.

Set the lifting arm to the fully Down position.
Position the rear wheels in wide tread.
Remove the side panels. Unlock and hinge open the bonnet.

Position of locks:
- below the front nose assembly;
- below the front nose assembly, on the rear left-hand side of the bonnet.
Disconnect the tractor battery;
Disconnect the front differential-locking control pipe at both ends (if fitted). Blank the pipe. Remove the guard and (4 WD) transmission shaft (all tractor types).
Remove the left footstep and if necessary, the right footstep and battery compartment.
Drain the fuel tanks.
Mark then disconnect:
- the harness on the side-tank gauge,
- the gas-oil supply and return hoses.
Remove the side tank.
Mark then disconnect the control cables and hoses of the compensating spool valves on the auxiliary spool valves.

During the Removal of the cables, it is essential to avoid turning the main spool of the valves through a half-turn , to avoid accidental connecting of the service and pilot-pressure pipes.

Remove the rear cab attachments and slightly raise the cab, ensuring there is no interference with the vertical exhaust assembly or windshield. During the operation, also check the behaviour of the speed control and of the mechanical reverse shuttle (if fitted), on the selector cover (Heavy duty transmission).
If the gear lifting arm interferes with lifting of the cab, disconnect it. Chock the cab using suitable axle stands.
Mark then disconnect:
- the return hose from the brake tank on the intermediate housing (Powershift transmission),
- the hoses of the left and right brake pipes located above the intermediate housing (blank hoses and tubes),
- the hose (17 bar) towards the power-assisted braking on the right-hand hydraulic cover,
- the cooler hoses routed to the right-hand hydraulic cover (Heavy gearbox),
- the pipe (17 bar) on the right-hand hydraulic cover (Heavy gearbox),
- the supply and pilot-flow hoses on the steering unit on the priority block(s).
Drain the intermediate housing and Centre housing. Note the contour of the plugs.
Remove suction pipe from the Gerotor pump, and the elbow unions fitted in the intermediate housing and Powershift transmission.
Remove the chassis reinforcements located either side of the Heavy duty transmission.


Fig1



Fig2

Remove clutch lube pipe (17) located between the intermediate housing (19) and spacer (16) (Fig. 1-2) (Heavy transmission).
Disconnect the handbrake control cable above the intermediate housing and creeper-speed control on the right-hand side of the intermediate housing (depending on option, all tractor types).
Mark then disconnect:
- the harness to the solenoid valves on the right-hand hydraulic cover, and the harness to the Park lock transmission lock located on the right-hand side of the intermediate housing (if the tractor is fitted with this device),
- the harness to the low-pressure switch and the one to the clogging switch on the main filter(15 microns),
- the harnesses to the load sensors,
- the connectors to the (MoveUp-MoveDown) solenoid valves of the lift control valve,
- the harnesses to the position sensors on the righthand lift bearing and the drive sensor on the centre housing,
- the PTO sensors (dual driving pinion and output shaft) on the rear housing.
Block the front axle, using suitable chocks (depending on the type of front axle Dana – ZF or Carraro).

Separating the gearbox from the intermediate housing

For tractors fitted with Park lock transmission locking, free lower shaft by turning the special screw on the unit located on the right-hand side of the intermediate housing clockwise until a hard point is felt.
Install the disassembly tooling.
Remove the screws securing the gearbox to the intermediate housing.
Assisted by an operator, separate the assemblies.

On the tractors fitted with a Heavy duty transmission with creeper unit, monitor the separation at the gearbox output shaft and drive pinion.

Separating the intermediate housing and the centre housing


Fig3

Remove the right- and left-hand covers in order to access hidden screws.
Remove and unstick cover (3) from 4 WD unit (if installed (Fig3). Identify positions of screws (2) securing intermediate housing (19) to centre housing.
Disconnect any hoses or pipes that may have remained connected to the various assemblies.
Chock the rear wheels. Place a fixed axle stand under the centre housing.
Sling the intermediate housing using suitable lifting equipment.
Remove housing attachment screws (2). Install guide studs of sufficient length then start the separation.

In the event of resistance being felt during separation, screw two screws of suitable length into tapped holes "T" located on the right and left attachment flanges of intermediate housing. Continue the extraction until the sumps are completely apart. Shaft (28) located between the drive bearing of the pumps and the PTO clutch comes out with the intermediate housing. Before setting down the shaft, if required visually mark land "D" to allow passage of the crown wheel.

Assembling the intermediate housing and the centre housing

Clean the mating surfaces of the housings.
Coat the mating face of the centre housing with sealing product - Loctite 510 or equivalent.
Check for presence and position of locating pin (1) sleeve itted into the centre housing.

The stud has two flats positioned parallel with the centre line of the housing.

If removed, reposition PTO shaft (28), checking the position of land "D" (Fig3).
Screw two guide studs at diametrically opposite positions on the centre housing.
Assemble the intermediate housing to the centre housing. Turn the pump driving pinion in order to mate the splines of shaft (28) with the splines on the PTO clutch.
Remove the guide studs. Install screws (2) and torque to 300 - 400 Nm.
Clean the mating surfaces of intermediate housing (19) and cover (3).
Coat the mating face of the housing Loctite 510. Reinstall the cover. Torque screws (4) to 50 - 70 Nm (Fig3).
Reinstall the right- and left-hand covers.

Assembling the gearbox and the intermediate housing

With the Powershift transmission:
Assemble the gearbox and intermediate housing.
With the Heavy transmission:
Assemble the gearbox and intermediate housing.

Reconnect the following items:
- PTO sensors
- position and status sensors
- solenoid valves (MoveUp - MoveDown) on lift control valve
- load sensors
- switch harnesses (low pressure and clogging)
- solenoid-valve harness on the right-hand hydraulic cover and Park lock transmission locking on intermediate housing (if installed)
- clutch lube pipe (17) (Fig.1-2) on Heavy duty transmission
- suction pipe (1) at Gerotor pump and sleeves (Powershift transmission)
- creeper-speed control (if fitted)
- the supply and pilot-flow hoses to the steering unit on the priority block(s)
- the 17 bar pipe on the right-hand hydraulic cover (Heavy duty transmission),
- the cooler hoses routed to the right-hand hydraulic cover (Heavy duty transmission)
- the 17-bar hose to the power-assisted braking on the right-hand hydraulic cover
- the hoses on the brake pipes
- the return hose from the brake tank on the intermediate housing (Powershift transmission)


Fig4

Rest the cab on its rear supports (Fig.4). Install the screws in the silent blocks. Torque nuts (1) to 27 -35 Nm and locknuts (2) to 13 - 20 Nm (installed with Loctite 270). Reinstall and if necessary adjust the chassis reinforcements.
Reconnect the hoses of the compensating spool valves and the control cables of the auxiliary spool valve units.
Reinstall the side tank.
Reconnect:
- the gas-oil supply and return hoses,
- the tank-gauge harness.
Reinstall the transmission shaft and guard.
Reconnect the front differential-locking control pipe (if fitted).
Reinstall the left footstep. If disassembled, reinstall the battery compartment and the right footstep.
Reconnect the tractor battery.
Align the wheels to their initial position. Torque screws or nuts to values shown.
Service the oil system and check the level in the transparent tube located on the left of the centre housing.

The drain plug in the intermediate housing is special. It has a cylindrical part which the other plugs do not. It is therefore essential to check its position during reassembly.

Pour fuel into the tanks.
If the tractor is equipped with "Park lock" transmission locking, return the special screw on the control panel to its initial position.
Start the engine.
Bleed the main brake system.
Close the bonnet.
Road test all of the controls.
Check the following points:
- leak tightness of hydraulic circuits
- leak tightness of the mating surfaces between gearbox / intermediate housing, intermediate housing / centre housing, and cover (3) of the 4 WD system (if installed) (Fig.3)
- presence of electronic and electrical functions
- hydraulic functions (low and high pressure).