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GBA20 mainshaft with Power Shuttle
40. Loosen nut (68).
41. Remove pinion (67).
42. Position shims (3) selected during operation
between two washers (6).
43. Install the pinion.
44. Degrease the thread of the shaft with a solvent.
45. Lightly smear new nut (68) with Loctite 270 then
tighten to a torque of 130 - 170 Nm.
46. Lock the nut by bending its collar, without breaking
it, into the grooves of the shaft using a suitable pin
punch.
47. Insert spring (72) and lubricating pipe (71) in the
shaft.
48. Remove the tool and the holding sleeve.
49. Fit pinion (18), 4th, 3rd synchromesh cones (33)
and (47) and 3rd, 4th synchromesh (23). The lubri-
cating grooves should be turned towards the 4th
pinion (18).
50. Fit a new circlip (26), opening it as little as possible.
After assembly, check that the circlip is not bent.
51. Manually check:
- the axial clearance of the pinions;
- the rotation of the shaft and its pinions.
52. Check that the 1st, 2nd synchromesh operates
properly.
05H02.10
D . Final operations
38
53. Install and shim the output shaft (see chapter 5).
54. Refit the layshaft (see chapter 5).
55. Refit the input unit assembly (see chapter 5).
56. Shim the layshaft (see chapter 5).
57. Refit the selector rail and the forks (see chapter 5).
58. Refit the selector cover (see chapter 5).
59. Couple the gearbox to the engine (see chapter 2).
60. Couple the gearbox and the rear axle (see
chapter 2).
61. Check operation of electric circuits.
62. Carry out a road test of controls.
63. Check for hydraulic tightness of the unions and
mating faces (selector cover, gearbox on rear axle).
Massey Ferguson 5400 - Issue 1.a
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