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GPA20 brake piston
Hydraulic test
N
: If work is carried out on the brake piston and
OTE
O'rings, it is necessary to check for leaks.
10. Check the condition of the supply union fitted on
the centre housing.
11. Fit a pressure gauge to the union.
12. Supply the circuit with compressed air at approx. 5
bar to ensure that the piston and O'rings are posi-
tioned correctly. Reduce pressure to 0.3 bar to
carry out the test.
13. Close the pressure relief valve. For one minute, no
drop in pressure must be observed on the pres-
sure gauge.
14. Remove the pressure gauge and reconnect the
brake hose.
Refitting the trumpet housing
15. Clean the mating faces on the rear axle housing
and on the trumpet housing with a non-greasy
solvent. Apply a bead of oil resistant silicone (Sili-
comet type) to the inner edge of the centre
housing
(Fig.
10). Refit the sun gear (2), the disc
(1), and locating pin (3)
N
: Check that the disc slides freely on the sun
OTE
gear.
16. Refit the trumpet housing (see chapter 6).
17. Bleed the main brake circuit and trailer brake circuit
(if fitted) (see chapter 9).
18. Test:
- linkage
- braking on the road
19. Check for tightness:
- between the trumpet and rear axle housing
- of the lift control valve feed pipe.
06C01.6
(Fig.
11).
Fig. 10
Fig. 11
Massey Ferguson 5400 - Issue 1.a
Fig. 9
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