Massey Ferguson 5400 - Issue 1.a
06E01.16
GPA20 differential
Refitting
68. Using a press and a suitable fixture, insert the
bearing cone (31) fully into the drive pinion
shoulder.
69. Place shims (50), their thickness determined by
the above formula.
70. Lightly smear the external diameter of the cup (37)
with Loctite 603 or equivalent and insert it to make
contact with shims (50) using a suitable fixture.
Eliminate any traces of Loctite.
N
OTE: Cones and bearings must be clean and lubri-
cated after fitting.
71. Fit the drive pinion and bearing cup (33).
Preparing for drive pinion shimming
72. Set a thickness of shims greater than the overhang
dimension “a” on the bearing cup (33) measured
in relation to the housing face (Fig. 20) to obtain a
provisional clearance of 0.10 mm to 0.15 mm
maximum for the pre-load shimming that follows.
73. Screw two diametrically opposed guide studs on
to the housing. Place the shims (36) determined in
operation 72 and fit the thrust plate (35).
74. Fit and tighten the screws (32) to 90 - 120 Nm after
removing the studs.
Shimming the drive pinion
1
st
method: preload adjusting
75. Place the dial gauge feeler pin on the end of the
drive pinion (Fig. 22).
76. Pull hard on the pinion through the front of the
centre housing and turn it alternately from left to
right in order to correctly seat the bearing cones in
their cups.
77. With the assistance of another operator, set the
dial gauge to zero.
78. Repeat the operation 76, this time by pushing.
Fig. 20
Fig. 21
Fig. 22
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