GPA40 rear axle - Adjusting the hand brake


Adjusting the mechanism 

Version without Park Lock device 

Ensure the cam (22) is in contact with the actuator lever (24).


Using a set of shims, adjust the mechanism (16), turning the nut (21) to obtain a clearance (J) of 1.0 to 1.2 mm between the discs (11) and the intermediate plates (26) on either side of the mechanism. When the tractor is not split between the gearbox and the rear axle, and it is necessary to adjust clearance J, remove the right-hand hydraulic cover plate. If necessary, remove the plug (2) to gain access to the adjustment nut (21).
After adjusting the mechanism (16), activate the hand brake control a few times and measure and adjust clearance J again (if necessary). In the "brake off" position, manually check the movement of the discs (11) and the intermediate plates (26). 

Version with Park Lock device 


Before adjusting the mechanism (16) on tractors fitted with a Park Lock device (PL), neutralise the force exerted by the Belleville washers on this mechanism. To do this, turn the Park Lock special screw clockwise until tight.

Temporarily remove the cam (22) from the actuator lever (24).
Using shims, adjust the mechanism (16) by turning the nut (21) to obtain clearance J of 1.0 to 1.2 mm between the discs (11) and the intermediate plates (26) on either side of the mechanism. When the tractor is not split between the gearbox and the rear axle, and it is necessary to adjust clearance J, remove the right-hand hydraulic cover plate. If necessary, remove the plug (2) to gain access to the adjustment nut (21).
After adjusting the mechanism (16), activate the hand brake control a few times and measure and adjust clearance J again (if necessary). In the "brake off" position, manually check the movement of the discs (11) and the intermediate plates (26).

Adjusting the control

Version without Park Lock device 
Position the rod (3) at an angle on the splined pin of the cam (22) so as to obtain a distance of 174 ± 9 mm (GTA1540 with an increased gross vehicle weight rating (GVWR)) or 179 ± 9 mm (GTA1040) under a load of 10 daN measured in the centre line of the cam (22) between the attachment axis of the cable on the rod and the external edge of the cable support (4). To optimise the effectiveness of the hand brake control, the adjustment distance that was 179 ± 9 mm becomes 174 ± 9 mm for tractors fitted with GTA1540 transmission with an increased gross vehicle weight rating (GVWR). 

Version with Park Lock device 
Before adjusting the hand brake control on tractors fitted with a "PL" Park Lock deviceneutralise the force exerted by the Belleville washers on this mechanism. To do this, turn the Park Lock special screw clockwise until tight. Position the rod (3) at an angle on the splined pin of the cam (22) so as to obtain a distance of 174 ± 9 mm (GTA1540 with an increased gross vehicle weight rating (GVWR)) or 179 ± 9 mm (GTA1040) under a load of 10 daN measured in the centre line of the cam (22) between the attachment axis of the cable on the rod and the external edge of the cable support (4).

Removing and refitting the hand brake lever, and adjusting the control cable

Removal
Remove the guard from the hand brake lever.


Disconnect:
- the switch (1) (if necessary);
- depending on the type of operation, either the hand brake cable (2) on the control rod (3) or the hand brake lever. Unscrew the screw from base S. Remove the complete hand brake lever from the cab floor.


Refitting
Refit the complete hand brake lever to the cab floor.

Adjusting the control cable
Check that the lock washer (1) is present between the two nuts (2).
Turn the nuts (2) to adjust the cable according to the distance indicated in figure.


Connect the control cable to the support (4) and the rod (3), observing the position of the nuts against the support (4). The control cable is "float" mounted on the support (4), which allows the cable to be aligned when it is under tension. Check the hand brake lever travel:
Tractors without Park Lock device
- Firmly activate the hand brake lever several times to pack the hand brake mechanism components down (discs, mechanism, intermediate plates, cable stop). Then check the travel of the hand brake lever: the tractor should be immobilised after approximately ten notches.
- If necessary, adjust the mechanism (16) and the control.
Tractors with Park Lock device
- Start the tractor engine to disengage the Park-Lock device.
- Firmly activate the hand brake lever several times to pack the hand brake mechanism components down (discs, mechanism, intermediate plates, cable stop). Then check the travel of the hand brake lever: the tractor should be immobilised after approximately ten notches.
- If necessary, adjust the mechanism (16) and the control.