GPA30 PTO Clutch - clutch unit and driving pinions


Removing and refitting the block consisting of the clutch unit and unit/driving pinion(s) assemblies

Split the PTO housing from the centre housing. Remove the sensor located on the upper right-hand side of the PTO housing to avoid any interference with the 1000 rpm pinion.

Removing the block consisting of the clutch unit (15) and unit/driving pinion(s) (23) assemblies

Power take-off with interchangeable shaft
Place the PTO housing flat on a workbench in order to allow removal of the output shaft (13). Recover the friction washer (20) that may still be on the driven pinion (7). Take off:
- the snap ring (6);
- the output shaft (13);
- the driven pinion (7).
Recover the friction washer (10) fitted between the driven pinions (7) (18).
Loosen the screws (27).


Remove the block consisting of the clutch unit (15) and unit/driving pinion(s) (23) assemblies from the PTO housing. If necessary, slightly offset the driven pinion (18) in order to facilitate removing the block. Remove the seal rings (22) 

Parts list 
(5) Hydraulic ring (6) Snap ring (7) 540 or 750 rpm driven pinion (depending on option) (10) Friction washers 53.4 x 67.8 (13) Interchangeable output shaft (15) Clutch unit assembly (18) 1000 rpm driven pinion (20) Friction washer 63.5 x 79.8 (22) Seal rings (23) Unit/driving pinions assembly (24) Belleville washer (25) Countersunk washer (26) Snap ring (27) Screw

Power take-off with jaw coupler 
Place the PTO housing flat on a workbench. Take off:
- the circlip (2);
- The splined washer (20).
Loosen the screws (27).


Tilt the block consisting of the clutch unit (15) and unit/driving pinion(s) (23) assemblies. Remove it from the PTO housing while simultaneously removing the driven pinion (7). Remove the seal rings (22).

Parts list 
(5) Hydraulic ring (7) 540 or 750 rpm driven pinion (depending on option) (13) Jaw coupling output shaft (15) Clutch unit assembly (22) Seal rings (23) Unit/driving pinions assembly (24) Belleville washer
(25) Countersunk washer (26) Snap ring (27) Screw 1000 rpm power take-off 
The clutch unit (15) and unit/driving pinion (23) assemblies of the 1000 rpm PTO can be removed without intervening on the lower shaftline driven pinion (18).

Place the PTO housing flat on a workbench. Loosen the screws (27).


Remove the block consisting of the clutch unit (15) and unit/driving pinion (23) assemblies from the PTO housing. Remove the seal rings (22).

Parts list 
(5) Hydraulic ring (15) Clutch unit assembly (18) 1000 rpm driven pinion (22) Seal rings (23) Unit/driving pinion assembly (24) Belleville washer (25) Countersunk washer (26) Snap ring (27) Screw


If necessary, extract the hydraulic ring (5) using a suitable slide hammer puller.

Splitting the block consisting of the clutch unit (15) and unit/driving pinion(s) (23) assemblies 
Place the block on a hollow support S.


Using a press and the tool ref. 3378135M1, moderately compress the Belleville
washer (24) to release the snap ring (26) of the countersunk washer (25).
Remove from the end of the sleeve (10):
- the snap ring (26);
- the countersunk washer (25);
- the Belleville washer (24).
Split the clutch unit assembly (15) from the unit/driving pinion(s) assembly (23) (depending on version). Remove screws (27).

Assembling the block consisting of the clutch unit (15) and unit/driving pinion(s) (23) assemblies 
Fit the screws (27) on the unit/driving pinion(s) assembly (23) (depending on version).


Place the rebuilt block on the support S, itself on a press table.
Refit on the end of the sleeve (10):
- a new Belleville washer (24), respecting the assembly direction;
- the countersunk washer (25), turning its recess towards the snap ring (26).
Using pliers, slightly increase the diameter of the snap ring (26). Place this snap ring temporarily on the sleeve (10).
Using a press, moderately compress the Belleville washer (24) to show a groove in which to fit the snap ring (26). Definitively insert the snap ring into this groove. Check that the snap ring is correctly positioned. Release the pressure exerted by the press on the Belleville washer (24). Check that the snap ring (26) is correctly held by the countersunk washer (25).

Refitting the block consisting of the clutch unit (15) and unit/driving pinion(s) (23) assemblies
If the hydraulic ring (5) needs replacing, fit, using a suitable locally made fitting drift, a new ring in the rear PTO housing, respecting the distance of 16 0.1 mm between the block mating face with the PTO housing and the end of the hydraulic ring. Correct ring positioning aligns its ports with the 17 bar channel of the rear PTO housing.


PTO with interchangeable shaft 
Clean and check all components. Replace any defective parts.
On each seal ring (22), check:
- the surfaces and sides are not worn;
- the hooks are in good condition.
Replace the seal rings if necessary.


Lubricate the reused or new rings (22) with clean transmission oil. Refit them in the grooves of sleeve (10) . Check that each ring rotates freely.
If necessary, slightly offset the driven pinion (18).
Engage the block consisting of the clutch unit (15) and unit/driving pinion(s) (23) assemblies into the PTO housing. Lightly smear the thread of the screws (27) with Loctite 242 or equivalent. Tighten these screws to a torque of 50 - 70 Nm. Lightly smear the friction washers (10) with miscible grease. Place these washers on either side of the driven pinion (18).

Refit:
- the driven pinion (7);
- the output shaft (13);
- the snap ring (6).
Smear the friction washer (20) with miscible grease. Place this washer on the driven pinion (7). Fit the PTO housing in a vertical position. 

Power take-off with jaw coupling shaft 
Clean and check all components. Replace any defective parts.
On each seal ring (22), check that:
- the surfaces and sides are not worn;
- the hooks are in good condition.
Replace the seal rings if necessary.
Lubricate the reused or new rings (22) with clean transmission oil. Refit them in the sleeve (10) grooves. Check that each ring rotates freely.
Tilt the block consisting of the clutch unit (15) and unit/driving pinion(s) (23) assemblies. Insert it into the PTO housing, while simultaneously sliding the driven pinion (7) onto the output shaft (13).
Lightly smear the thread of the screws (27) with Loctite 242 or equivalent. Tighten these screws to a torque of 50 - 70 Nm.

Refit:
- the splined washer (20);
- the circlip (2).
Fit the PTO housing in a vertical position. 

1000 rpm power take-off
Clean and check all components. Replace any defective parts.
On each seal ring (22), check that:
- the surfaces and sides are not worn;
- the hooks are in good condition.
Replace the seal rings if necessary.
Lubricate the reused or new rings (22) with clean transmission oil. Refit them in the sleeve (10) grooves. Check that each ring rotates freely.


Engage the block consisting of the clutch unit (15) and unit/driving pinion (23) assemblies into the PTO housing.
Lightly smear the thread of the screws (27) with Loctite 242 or equivalent. Tighten these screws to a torque of 50 - 70 Nm.
Fit the PTO housing in a vertical position.
Lightly smear the thread of the PTO sensor with Loctite FORM GASKET 2.
Reconnect and adjust this sensor in the following manner:
- Tighten the sensor home, without forcing, until it comes in contact with the 1000 rpm driving pinion.
- Unscrew the sensor by 3/4 turn,
- Tighten the sensor nut moderately.
Assemble the PTO housing with the centre housing.
Test the clutch and its brake.