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GBA20 mechanical reverse shuttle
C . Preliminary operations
I
: If the input unit is removed to replace the
MPORTANT
complete unit or only the housing (26) , it is necessary
to shim the layshaft of the gearbox again after
removing the input unit (see chapter 5).
1. Disassemble the tractor between the engine and
the gearbox (see chapter 2).
2. Drain the gearbox and the rear axle.
3. Remove the input unit (see chapter 5).
4. Disassemble the locking device, the selector rail
and the shuttle fork (see chapter 5).
5. Disassemble the Speedshift unit (see chapter 5).
05C01.10
D . Disassembling and reassembling
the reverse shuttle
Disassembling the transfer pinion (15) for
reverse operation
6. Take out set screw (10).
7. Take out the shaft (13).
8. Remove the transfer pinion (15), washers (12),
needle bearings (14) and spacer (11).
Disassembling the reverse shuttle
9. Take off circlip (25).
10. Remove the shim(s) (1).
11. Drive the secondary shaft out of the pinion /
synchromesh assembly.
12. Take out the pinion / synchromesh assembly (18)
from the housing. Remove the washer (8), marking
its positioning.
13. Fit the pinion / synchromesh assembly on a work-
bench.
14. Separate
(Fig.
9):
- pinion (5);
- ring (7);
- needle bearing (6);
- cones (brake) (4) and (39);
- coupling flanges (22);
- pinion (23);
- needle bearing (20).
15. If required, extract the ball bearing (24) from the
secondary shaft (19).
Remove the washer (35), marking its positioning.
(Fig.
7)
(Fig.
Massey Ferguson 5400 - Issue 1.a
8)
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