Shiftable output shaft GPA30 - the flange shaft and rear bearings


Removing - refitting the flange shaft

The flange shaft may have 6, 20 or 21 splines.

Removal 
Remove off the protector (9).
Immobilise the shiftable output shaft (13) using a locally made V screw (M12).
Loosen the screws (6). Remove the flange shaft (5).


Refitting 
Check for the presence of the locating pin (35). Refit the flange shaft.
Immobilise the output shaft. Tighten the screws (6) to a torque of 120 - 160 Nm. Manually check the mobility of the shiftable output shaft.
Refit the protector.

Replacing the rear bearing cassette seal

Split the rear PTO housing from the centre housing.
Remove the rear bearings and strip the shiftable output shaft (13).
Note the position of the cassette seal (14) in the rear bearing (22). Extract the cassette seal. Discard the O'ring (15).

Replacing the seal
Clean and check all components. Replace any defective parts.
Using the tool ref. 3378115M1, insert the cassette seal (14) in the bearing (22), turning the seal lip towards the inside of the PTO housing.


After fitting, check that the seal is positioned as indicated.
Fit a new O'ring (15) on the rear bearing (22).
Lubricate the inner rim of the cassette seal (14) and O’ring (15) with clean transmission oil.
Recondition and refit the bearing (22)/shiftable output shaft (13) assembly on the PTO housing. Refit the driven pinions (18) (7).
If necessary, refit the sensor located on the lower right-hand side of the power take-off housing. Moderately tighten the screw. Fit the PTO housing in a vertical position. Assemble the rear PTO housing to the centre housing.

Shimming the rear bearings

Split the rear PTO housing from the centre housing.
Take off:
- the 540/1000 rpm or, optionally, 750/1000 rpm driven pinions;
- the rear bearing (22)/shiftable output shaft (13) assembly;
- the bearing cone (19) from the PTO housing;
- the flange shaft (5) of the shiftable output shaft (13).

Shimming
Note dimensions A and B. To avoid being hindered by the resistance of the cassette seal (14) on the shiftable output shaft (13), the seal should be temporarily excluded during measurement of A and B values.


Dimension A
Using a depth gauge, measure dimension A on the PTO housing.
Dimension B
- Rest the bearings/shiftable output shaft (13) assembly on the rear bearing block. This assembly comprises:
- bearing cones (3) (8) and their cup;
- castellated washer (4);
- circlips (16) (17).
- Ask an operator to exert a strong and constant manual pressure on the bearing cup (19).


Simultaneously turn the shiftable output shaft (13) from left to right so as to correctly "seat" the bearing cones in their cups.
- Measure dimension B at two opposing points. Take the average of the two measurements.
Calculate B - A. Depending on the result, select a thickness of shim(s) (23) to obtain a clearance J of 0.05 to 0.15 mm. If possible, shim so as to obtain minimum tolerance.


Final operations
Refit:
- the flange shaft (5) on the shiftable output shaft;
- the bearing cup (19) in the PTO housing;
- the rear bearing (22)/shiftable output shaft (13) assembly fitted with:
- a new cassette seal (14),
- the shim(s) (23) selected during operation.
Lightly smear the thread of the screws (2) with Loctite 242 or equivalent. Tighten these screws to a torque of 72 - 96 Nm.
Refit the 540/1000 rpm or, optionally, 750/1000 rpm driven pinions;
Assemble the rear PTO housing to the centre housing.

Adjusting the cable control

On lever L 
Push the control lever L located inside the cab to the 1000 rpm position.


Screw the clevis (1) flush with the threaded end of the cable (6).
Fit the clevis on the lever using clip (7). Tighten the nut (2).
Position the nut on the threaded sheath end (5).
Fit the threaded sheath end on the bracket. Tighten nut (4) and check that the cable is not constrained in any way.


On link B 
Turn link B towards the front of the tractor in the 1000 rpm position.
Screw clevis (9) flush with the threaded part of cable (6).
Fit clevis (9) on link B using clip (10). Tighten the nut (11).
Adjust the stop (12) on bracket (8) using nut (13), taking care that link B does not move.
Tighten nut (14) and check that the cable is not constrained in any way.
Check control operation in the 540 or 750 rpm positions (depending on option) and in 1000 rpm position.