MASSEY FERGUSON 5400 - Page 287

Massey Ferguson 5400 - Issue 1.a
06C01.5
GPA20 brake piston
C . Reassembly
6. Check and clean all components. Replace any
defective parts.
N
OTE: To ensure that the brake self-adjusting
system operates correctly, it is mandatory to
centre the right- and left-hand differential flanges
with a locally made tool (see chapter 6).
7. Fit the piston (1) without seals in the housing (2)
(Fig. 6) and check that it slides freely in the bore of
the housing and that it fits onto the locating pins (3)
without any friction points. Remove the piston
after carrying out this check.
8. Fit spring pins (4) about 8 mm from machined face
“F” of the piston (3) (Fig. 7).
Fit new O'rings (1) (2) (Fig. 5) after smearing them
with a moderate quantity of miscible grease so
that they remain at the bottom of the groove.
9. Position the piston over the locating pins, then fit it
in place using a plastic mallet, striking in alternate
points around the circumference (Fig. 8).
Fit the screws (3) (Fig. 9) after lightly smearing
them with Loctite 241 and tighten them to a torque
of 10 Nm with the locally made socket.
Fig. 5
Fig. 6
Fig. 7
Fig. 8