Removing and install the spool valve blocks of auxiliary mechanical spool valves GPA30 rear axle



Preliminary operations
Disconnect the control cables (7) of each spool valve component by uncoupling the sleeves (1) located under the cab.


Mark the position of the hydraulics hoses connected to the couplers. Disconnect them from the spool valve block.
Disconnect :
- the high pressure pipe (30);
- the lift ram supply pipes (16);
- the LS hose (9).


Mark and disconnect the lift control valve solenoid valve harness (R10 Down - R11 Up).

Removal
Remove the screws (3) and flanges (2) from the manifold (21).


Sling the spool valve block. Separate it from the support (1). Place it in a clean work area. If necessary, remove support (1).


Discard the O'ring (3).


Reinstall
If it was necessary to remove the support (1), replace the return pipe (3) O’rings (2). Tighten the screws (4).
Clean the manifold (21) mating face, along with that of the support (1).
If the studs (2) need replacing, lightly smear the short thread of the new studs with Loctite 270 or equivalent. Install and tighten the studs. Clean off any excess Loctite. Replace the O’ring (3).
Reinstall the spool valve block on the support (1). Tighten:
- the screws (3) to a torque of 50 - 70 Nm;
- the nuts (2) to a torque of 90 - 120 Nm.


Reconnect the lift control valve solenoid valve harness (R10 - R11) according to the marks made during removal.


Reconnect:
- the LS hose (9);
- the lift ram supply pipes (16);
- the high pressure pipe (30).

Connect the coupler hoses to the spool valve block.

Reconnect the control cables (7) of each spool valve component, leaving an identical threaded
length on either side of the link (2). Couple the sleeves (1). Adjust the control cables.

Carry out the hydraulic tests if one or more spool valve block components needed replacing.

Check:
- spool valve component operation;
- the tightness of the spool valve block, pipes and hoses.



Disassembly
Carefully clean the spool valve block prior to disassembling. Remove any traces of dried mud or earth that could contaminate any spool valve components that could be reused.

Place the spool valve block in a vertical position.
Loosen the nuts (1). Remove the end plate(s) (right and/or left) from the spool valve block.


Separately remove the concerned spool valve components, making sure not to lose:
- the O’rings between each component;
- the non-return valve (1) and its spring on the manifold (21).


If necessary, loosen the six studs screwed on either side of the manifold (21). These studs may be of variable length depending on the number of components fitted onto the spool valve block.

Reassembly
Clean the mating faces:
- of the manifold (21), without removing the adhesive shims (pellets);
- the spool valve component(s) (auxiliary and lift control)


If the studs on the manifold (21) need to be replaced, lightly smear the short thread of the new studs with Loctite 242 or equivalent. Install and tighten the studs. Clean off any excess Loctite.
Check the presence:
- of the seals (3) to (5) in each spool valve component spot-faced port (1);


- of the seals (3) to (7) in each manifold (21) spot-faced port;
- of the non-return valve (1) and its spring on the manifold (21);
- of the adhesive shims (P pellets).


Reassemble the spool valve block by assembling the spool valve component(s) on the manifold (21).
The lift control valve is integral to the auxiliary spool valve block components. It is located between the manifold (21) and either the right-hand end plate or the 4th spool valve component (if fitted).
Reinstall the end plate(s) (right and/or left) on the spool valve block.


Install and alternately tighten the nuts (3) to a torque of 30 - 33 Nm. This torque must be respected in order to avoid any risk of spool valve component warping and subsequent spool seizing.

Assembling and adjusting a control cable


To be performed on the console 

Remove right-hand console cover.
Install the unit (1) and its control cable on the suitable fixture.
Install the console cover.

To be performed on the auxiliary spool valve 

Check, without turning, that the valve spool is in neutral position.
Screw clevis (1) flush with the threaded part of cable (7). Tighten nut (3). Fit the pin (4).

Screw:
- the bell housing (8), partially;
- the screws (6) without tightening them.

Adjust the bell housing (8) by turning it from left to right to centre the lever (1) in the console opening.


Lock the screws (6). Tighten the nut (9) to a torque of 20 Nm.
Check the operation of the spool valve control in all four positions.