Split the tractor between Engine and Gearbox

This section presents a general disassembly procedure.
Due to the diversity of the hydraulic and mechanical the options available on the tractors, mention will only be made of those the pipes or main connections to be disconnected.
For this reason, before and when disassembling the tractor, ensure no connections remain between the fixed assembly and the moving assembly.
The tractors may be equipped either with a Powershift transmission or a Heavy duty transmission. Disassembly remains basically identical for both versions.

Available equipment fits
- Powershift transmission AG150
- Powershift transmission AG250
- Heavy duty transmission.

The tractor cab remains attached to the rear axle.
Disassembling the engine and gearbox allows working on the mechanical parts located to the rear of the engine and principally in front of the Heavy transmission.

Remove the side panels. Unlock and hinge open the bonnet, or remove (if necessary).

Position of locks:
- below the front nose assembly,
- below the front nose assembly, on the rear left-hand side of the bonnet.
Remove the front weights. Disconnect the battery terminals.
Remove the turbocharger guard.
Remove the vertical exhaust assembly, the pipe sleeve-fitted on the turbo, and the flexible sleeve connected to the air cleaner.
Disconnect the front differential lock control pipe at both ends (if fitted). Blank the pipe. Remove the transmission guard and shaft (4 WD) (all tractor types).
Mark the position then disconnect the following hoses:

Powershift transmission
- the charge and return hoses to/from the brake master-cylinders,
- the hoses to the thermostatic valve.
Heavy duty transmission
- Mark and disconnect the hoses coming from the right-hand hydraulic cover towards the cooler. Blank the hoses and ports,
- the charge and return hoses to/from the brake master-cylinder tank.

Disconnect the harness and remove the starter.
Disconnect the gas-oil supply and return hoses. If necessary, drain the fuel tanks, disconnect the gauge harness and remove the side tank.
If required, remove the guards located either side of the radiator.
Disconnect the throttle control at the fuel injection pump.
Disconnect:
- the heating hoses under the right-hand floor of the cab, or on the engine, ensuring their positions are identified. Blank the hoses and ports in order to prevent complete drainage of the cooling system,
- the air conditioning intakes at the front left of the cab. Fit blanking plugs,
- the main harness connections above and to the left of the engine.
Mark then disconnect the steering hoses on the steering unit.
Remove the engine oil filter, to gain naccess to the hidden screw securing the gearbox (if necessary).
Set the handbrake and block front axle using appropriate chocks. If necessary, remove
the chassis reinforcements.
If required, raise the cab slightly and wedge in place.

If the side tank was not removed, check the condition of the flexible unions between the
tanks and the filler pipe hose connection. On Heavy gearboxes, check the condition of the gear control and reverser lifting arm and the selector cover. If the gear lifting arm interferes with raising of the cab, disconnect it.

Remove screws placed either side of the engine and gearbox. Replace with two guide studs of suitable length.

If necessary, remove the access door set in the inner floor of the cab, to gain easier access
to the upper screws fixing the engine to the gearbox.

Position the disassembly tooling.
Finish removing the other attachment screws securing the engine on the gearbox.
Assisted by an operator, separate the assemblies.

On the Powershift transmission
Coat one seat of spring  with adhesive (Loctite 401 or equivalent). Slide the spring on shaft, the Loctited seat pointed towards the shoulder of the shaft. Allow the Loctite to dry a few seconds. Lightly lubricate the splines of main shaft with grease or equivalent.



Fig.1


On the Heavy duty transmission
- Lightly lubricate the splines of main shaft (1) (Fig. 1) using the type of grease mentioned previously.
Clean the mating surfaces:
Powershift transmission
- of the engine and gearbox.
Heavy transmission
- of the engine and spacer.

Coat the mating face of the gearbox or the spacer with a sealing product (Loctite 510 or equivalent).
Screw two guide studs of suitable length onto the gearbox or spacer (depending on option).
Check the presence of the two locating pins (10) on the engine (Fig. 2).




Fig.2


Assemble the engine to the gearbox or the spacer. In order to facilitate engagement of the main-shaft splines with those in the hub of the damper, manually rotate the crown wheel on the engine flywheel, inserting a suitable tool in the hole provided for fixing the starter.

Powershift transmission AG250 (Fig. 3)



Fig.3


Remove the two guide studs. Install screw (1), washers (2), spacers (4) and nuts (3). Apply a light coating of Loctite 270 then torque the screws to 480-640 Nm.

Powershift (AG150) and Heavy Duty transmissions (Fig. 2)

- Remove the two guide studs. Fit washers (8). Apply a light coating of Loctite 270, then torque the screws as follows:
. (1) : 240 - 320 Nm
. (2) : 300 - 400 Nm
. (3) : 400 - 540 Nm
. (4) : 100 - 130 Nm
. (5) : 300 - 400 Nm
. (6) : 790 - 1050 Nm
. (7) (9) : 630 - 840 Nm

If the tractor cab was raised, reposition it on its front supports. On tractors fitted with the Heavy transmission, monitor the behaviour of the gear control lifting arm during refitting of the cab. If necessary, reinstall and adjust the gear lifting. Install and screws in silent blocks and torque to 200 - 270 Nm.
Remove the disassembly tooling.
Remove the chocks from the front axle. Reinstall and if necessary adjust the chassis reinforcements.
Reinstall the engine oil filter (if necessary).

Special point:
- The filter must be in contact with its support; tighten it through an extra quarter-turn approximately.

Reconnect the steering-cylinder hoses.
Reconnect the main harness connections.
Assemble the air conditioning intakes.
Reconnect the heating hoses under the cab or on the engine (depending on option).
Reconnect the throttle control at the fuel injection pump. If necessary, reinstall the guards located either side of the radiator.
If disassembled, reinstall the side tank and reconnect the gauge harness, the gas-oil supply and the return hoses.
Reinstall the starter. Tighten the screws. Reconnect the harness.
Reconnect the hoses.
Reinstall the transmission shaft and guard. Reconnect the differential lock control pipe (4 WD) (if fitted).
Reinstall the flexible pipe connection, the tube on the turbocharger and the vertical exhaust assembly.
Install the Guard.
Reconnecting the tractor battery.
Check the setting of the throttle control.
If the side tank was removed, pour fuel into the tanks. Service the cooling system and the expansion tank.
Start the engine.
Close the bonnet.
Perform a road test.
Check the following points:
- leak tightness of hydraulic circuits,
- operation of electrical circuits.