Johnston VM502, Maintenance Manual

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MA7:9
V Range 502
l
652
l
802 Maintenance Manual
Johnston Sweepers Limited
Chapter - Remove and Refit Procedures
Fluid Drive Coupling
Removal
1. Carry out procedures for Fan Impeller, Fancase and Gearbox removal
2. Remove the twenty socket head screws securing the coupling to the flywheel.
3. Insert M8 setscrews in the two blind extractor holes and tighten each half a turn at a time to ease
the coupling from the flywheel.
M02MA-023
1
9 10 4
2
3
6
7 5 8
(1) Fluid coupling.
(2) Flywheel.
(3) Bell housing.
(4) Gearbox.
(5) Gearbox input shaft.
(6) Gearbox support bearing.
(7) Oil seal.
(8) ‘O’ ring.
(9) ‘O’ ring.
(10)
Adaptor ring.
Sectioned view of Fluid Drive Coupling and Flywheel
Refitting
1. Before fitting coupling, renew oil seal and ‘O’ rings (Items
8
,
9
and
10
, Figure 2).
2. Generously grease both ‘O’ rings and internal splines with Kluber Paste 46MR401.
3. Offer fluid drive to the flywheel ensuring bolt holes are in line. Push assembly together by hand,
making sure not to trap and damage the large ‘O’ ring.
4. Refit fluid coupling securing screws.
Note:
For JCB engine, torque the 20 x M8 screws to 26Nm.
For John Deere engine, torque the 20 x M6 screws to 19Nm.
Gearbox
Refitting
1. Lightly grease splines on the input shaft with Kluber Paste 46MR401.
2. Locate the adaptor ring with its holes aligned with those on the flywheel housing.
3. Ease the gearbox onto the engine bell housing whilst rotating the output shaft. Use the securing
setscrews to finally pull the gearbox up to the housing.
4. Ensure the output shaft rotates freely after assembly.
5. Refit the two side cover plates.
6. At this point it is advisable to refill the fluid coupling and gearbox as described in Chapter 1 of this
manual.
Fancase
Refitting
1. Refitting is the reverse to that described in procedure 5.
2. When re-assembling the fan mask to the gearbox ensure it abuts to the rubber diaphragm ring.
Apply stud lock to its retaining screws before fitting.
Fan Impeller and Fancase Cover
Refitting
1. Reverse to that described in procedure 4. (See also Chapter 6)
2. Ensure the ‘V’ mark on the fan impeller is placed TDC.
3. The three screws securing the fan to the gearbox shaft to be torqued.
Refer to Chapter 6 for torque values.
VT - Twin Engine