Split the tractor between front frame and Engine

General tractor disassembly procedure.
Due to the diversity of the hydraulic or mechanical options available on the tractors, mention will only be made of those 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.
Disassembling the front frame and the engine of tractor allows working on the mechanical parts located at the front of the engine.

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.
Disconnect the tractor battery.
Disconnect the front differential-locking control pipe at both ends (tractor front axle).
Remove the transmission guard and shaft (4 WD).
Remove the guards located either side of the tractor radiator.
Disconnect the horn wiring harness located inside the nose assembly.
Mark then disconnect the tractor steering hoses from the side pipes fitted on the engine mount (Blank the pipes).
Disconnect the vacuum-gauge harness. Remove the suction pipe from the air cleaner above the tractor radiator.
Drain the engine cooling system.
On the radiator, disconnect:
- the hoses (lower and upper),
- the hose connecting the radiator and the expansion tank.
Remove the cleat above the radiator.
Mark the position then disconnect the following hoses:
Powershift transmission - the hoses from the cooler to the thermostatic valve.
Heavy duty transmission - the cooler hoses routed to the right-hand hydraulic cover.
Disconnect the air conditioning intakes at the front left of the cab. Fit blanking plugs.
Remove the compressor from its mounting and tilt forward without disconnecting the hoses.
If necessary, remove the steering cylinder from front axle to gain access to the screws securing the tractor frame to the engine.




Fig.1


Remove the chassis reinforcements located either side of the engine (if installed).
Set the handbrake and block front axle (1), using suitable chocks. Chock the rear wheels.
Remove one screw (3) (Fig. 1-2) on each front engine of tractor mount, replacing by two guide studs of sufficient length.



Fig.2


Remove the front weights and belly weights (if installed).

Position a fixed tractor axle stand under the engine sump.
Position a movable axle stand under the front axle (2 or 4 WD), in the longitudinal axis of the tractor, or use suitable lifting equipment.
Finish removing the other attachment screws (1) (2) (3) (Fig. 1-2) from the front engine frame.
Assisted by an operator, separate the assemblies.

Assemble the tractor frame with the engine.
Remove the guide studs. Install and torque the screws as follows (Fig. 1-2) :
- (1) : 670 - 900 Nm
- (2) : 520 - 640 Nm
- (3) : 300 - 400 Nm

Remove the shims between the frame and the front axle.
If necessary, reinstall the tractor chassis reinforcements and the front weights.
If disassembled, reinstall the steering cylinder. Apply a light coating of Loctite 270 then torque the screws to 180 - 200 Nm and torque ball nuts to 140 - 155 Nm. Lock the nuts using new pins.
Tilt the compressor towards the rear and rest it on the support.
Remove the blanking plugs. Reconnect the air conditioning intakes.
Reconnect the hoses.
Reinstall the cleat above the tractor radiator.
On the radiator, reconnect:
- the hoses (lower and upper),
- the hoses connected to the radiator seat and the expansion tank.
Service the engine cooling system and the expansion tank.
Reinstall the suction pipe on the air cleaner above the radiator.
Reconnect the steering hoses on the side pipes fitted on the tractor engine mount.
Reconnect the horn wiring harness.
Reinstall the guards located either side of the radiator.
Reassemble the transmission shaft and guard. Reconnect the front differential-locking control pipe (4WD).
Reconnecting the tractor battery. Close the bonnet.
Start the engine.
Perform a road test.
Check the following points:
- leak tightness of hydraulic circuits,
- operation of electrical circuits,
- coolant level.

Tightening torques (if required)
- Front wheel nuts : 640 - 680 Nm
- Belly weight screws (if fitted) 300 - 350 Nm, Loctite 270.

Some tractors are equipped with Dana front axle.
The front frame (axle support) has a different shape to that with a Carraro front axle and ZF front axle.
The procedure applied to split the front frame with Carraro front axle and ZF front axle is practically identical to that used for Dana front axles.

Set the handbrake and immobilize the front axle (5) using triangular chocks. Chock the rear wheels.
Remove the front weights (if fitted).
Remove the side panels. Unlock the bonnet and hinge it open. Use a rope to hold the bonnet open and disconnect the lower clamps on the holding cylinders.
Disconnect the negative terminals on the batteries on the right-hand side of the tractor.
Remove the tractor guards (2) (2A) and the universal drive shaft.
Remove the tractor guards located either side of the radiator.
Remove the clamp that holds the tubes, hoses and harnesses above the radiator.
Remove the chassis reinforcements on either side of the engine (if fitted).
Mark and disconnect all the tractor hydraulic unions connected to the frame, front axle and steering cylinder, but leave the air conditioning hoses in place.

These links are located above the radiator and on the right- and left-hand sides of the tractor.

Remove the engine air filter intake pipe above the radiator.
Drain the engine cooling system.
On the tractor radiator, partially disconnect:
- hoses (upper and lower)
- the linking hoses between the radiator and the expansion tank.
Tilt the air conditioning condenser housed in the front nose assembly to the front and rear of the engine without disconnecting the hose involved.




Fig.3


Remove the steering cylinder to access the adjusting screw that attaches the frame on the engine.
Remove a screw (3) (Fig. 3-4) from each square at the front of the engine, replacing it by a long guide stud of sufficient length.



Fig.4


Remove the belly weight (if fitted).
Position a fixed axle stand under the engine sump.
Position a movable axle stand under the front axle in the longitudinal axis of the tractor, or use a suitable lifting fixture.
Finish removing the other attachment screws (1) (2) (3) (Fig. 3-4) from the engine frame.
Assisted by an operator, separate the assemblies.

Assemble the frame with the engine.
Remove the guide studs. Fit screws and torque to (Fig. 4):
- (1) : 670 – 900 Nm
- (2) : 520 – 640 Nm
- (3) : 300 – 400 Nm
Refit the steering cylinder of the tractor.
Refit the condenser.
Reconnect all the cooling hoses.
Refit the engine air filter intake pipe.
Reconnect the tractor hydraulic unions.
Refit the clamp above the radiator.
Reinstall the radiator side guards.
Refit the universal drive shaft and the guards (2) (2A).
Reconnect the negative terminals to the tractor batteries.
Top up the fluid level in the engine cooling system and the expansion tank.
Start the engine. Check the electrical tractor equipment for proper operation.  Check for tractor hydraulic tightness:
- of hydraulic hoses and unions
- of hoses.

Tractor front axle with a suspension system
- Activate front axle suspension system several times making it move from low position to high position and vice versa in order to check it and detect leaks, if any.
- In case of dysfunction, use the calibration procedure.

Tractor front axles fixed or with a suspension system
Close the bonnet and reinstall the side panels.
Carry out a road test.
Tightening torques (if necessary)
- Front wheel nuts: 640 – 680 Nm.
- Belly weight screw: 420 – 560 Nm, Loctite 270.