Johnston VM502, Maintenance Manual

Page: 177 / 220

MA7:7
V Range 502
l
652
l
802 Maintenance Manual
Johnston Sweepers Limited
Chapter - Remove and Refit Procedures
VT - Twin Engine
9 Gearbox Removal & Overha
ul
Removal
1. Carry out procedures 4 and 5.
2. Drain fluid drive coupling as described in Chapter 7.
3. Remove the six setscrews securing the gearbox to the bell housing and the four bolts holding the
two cover plates to the flywheel housing.
4. Withdraw the gearbox, supporting its weight so as not to damage the input shaft fluid drive coupling.
Repair / Overhaul
If it is proposed to carry out a repair or overhaul of the gearbox
then it is important to check the following dimensions in
respect to the bore supporting the output shaft.
In all cases maintenance of this gearbox should only be
carried out by experienced and qualified personnel.
The integrity of the gearbox is reliant on the condition of the
upper rear bearing housing. This bore needs to be checked
and confirmed to be within the specified tolerances.
Note:
If the bore falls outside the tolerance of Ø90.000 – 90.035mm
we recommend that the Gearbox is replaced.
M02MA-044
Ø 90.035
90.000 (H7)