MASSEY FERGUSON 5400 Service Manual page 296

GPA20 handbrake unit and control
15. Remove the retainer ring (33) and remove the seal
(19).
16. Release the spring (17) using pliers.
17. Loosen the nut (4) to release the guide rod link (13)
from the cam (14).
18. Take off circlip (15).
19. Remove the cam (14) with the finger (16).
20. Remove screw (25).
21. Remove the closing plate (24) and the control pin
(20).
N : Keep the mechanism (31) and the brake
OTE
discs (30) towards the rear. Extract the closing
plate (24) (Fig. 6), tilting it to disengage it from the
pin (18), finger (23) and drive pinion (26) and to
release the pin (20) from the housing.
22. Remove the spring (17) and the washer (22).
23. Remove the snap ring (21) (if necessary) on the
control pin (20).
24. Remove the discs (30) and the mechanism (31).
If the mechanism needs to be replaced
25. Unscrew the nut (4), remove the plate (5) and the
pin (6).
26. Take out the pin (9), remove the pin (8) and the
clevis (7).
N : The stud (3) is smeared with Loctite 270 and
OTE
locked in the clevis (7).
If the thrust plate (29) needs to be replaced
27. Remove two diametrically opposed screws (28)
and screw in two guide studs (A)
purpose of this operation is to hold the shims (27)
(Fig. 8).
28. Loosen the two remaining screws.
29. Remove the thrust plate (29).
N : Check that the shims have all remained on
OTE
the housing.
The finger (16) smeared with Loctite 270 is
screwed into the cam (14). The finger (23) smeared
with Loctite 270 is screwed into the thrust plate
(29).
The locating pin (18) is fitted fully home on the
shoulder of the closing plate (24).
06D01.8
(Fig. 7). The
Massey Ferguson 5400 - Issue 1.a
Fig. 6
Fig. 7
Fig. 8