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GPA20 shiftable shaft
Refitting the shaft
(Fig.
59. Slide the bearing cup (1) into the housing unit.
60. As required, insert the bearing cones (2) (3) up
against the shaft collar using a press and a suitable
fixture.
61. Introduce the shaft (13) into the 540 - 1000 rpm
driven pinions.
62. Position the rear bearing cup (4).
63. If necessary, carry out the shimming of bearings
(see later).
64. Replace the sealing ring (11) (see later).
65. Take off the two screws previously installed.
Smear the rear face of the housing unit (14) with
Loctite 510 or equivalent and refit the cover (8)
fitted with a sealing ring.
66. Fit two screws, their thread lightly smeared with
Loctite 542 or equivalent and tighten to a torque of
100 - 130 Nm.
67. Take off the guide studs and install two more
screws, following the previous instructions.
68. Refit the support and tighten it to 30 - 50 Nm.
69. Tighten the cap moderately.
Shimming the bearings
Preparing for shimming
70. Remove the cover (8), without Loctite, eliminating
the shims and sealing ring (11).
N
: By eliminating the shims, there is the risk of
OTE
creating excessive clearance. In this case, fit a
thickness of shims to reduce the clearance to
approximately 0.35 mm.
71. Position the dial gauge feeler pin on the end of the
shaft
(Fig.
15).
72. Pull hard on the shaft, turning it to and fro from left
to right to correctly "seat" the cones in the bearing
cups.
73. Reset the dial gauge to zero.
74. Repeat the operation 72, this time by pushing.
75. Depending on the value read on the dial gauge,
prepare a thickness of shim(s) (6) in order to obtain
a final clearance of:
J1 = 0.05 to 0.15 mm
N
: If possible, shim to obtain minimum toler-
OTE
ance.
07D01.18
14)
(Fig.
15)
Fig. 15
Massey Ferguson 5400 - Issue 1.a
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