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Reconditioning
If the synchronisers (11), (23) et (31) are disassembled,
check the wear to the cones (2) and (8) in the following
manner:
1. Stack the coupling flange (3), cones (2) and (8) and
ring (7).
2. Correctly position the ring (7) on the cones (2) et
(8), revolving them alternately each several turns
and applying pressure manually.
3. Using a set of laminated shims, measure
dimension X
(Fig.
4) at three equidistant points.
Calculate the average of the three values and
proceed as described below, depending on the
result obtained:
On a new synchroniser, dimension X must be
1.6 mm minimum.
After operation, if X is less than or equal to
0.60 - 0.80 mm:
- replace the cones (2) and (8),
- check the measurement of X again, using the
same process.
If dimension X remains incorrect, also replace
ring (7) or, if necessary, the complete synchro-
niser.
Massey Ferguson 5400 - Issue 1.a
General - GBA20 with Power Shuttle Operation
Low range (Tortoise)
Gear engagement is obtained by moving one of the
synchroniser sliding couplers (11) or (23) to join, in rota-
tion, the mainshaft (69) with one of the idle-mounted
pinions (1st, 2nd, 3rd, 4th). No matter what gear is
selected, the drive is transmitted to the layshaft (54).
The output shaft (44) is driven by the teeth machined
on the layshaft, which is constantly meshed to the
idle-mounted pinion (36).
The low range (Tortoise) is obtained by moving the
synchroniser sliding coupler (31) backwards.
High range (Hare)
The high range is obtained by moving the synchroniser
sliding coupler (31) forwards, meshing the driving
pinion (29) and the output shaft.
Consequently, in 3rd gear Hare, the layshaft (54) is
inoperative. The other gears are obtained by moving
the synchroniser sliding couplers (11) or (23) as with
the Tortoise range. Drive is transmitted to the output
shaft (44) by driven pinions (29) and (55).
Fig. 4
05A02.11
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