R380 Manual Gearbox Overhaul
MANUAL GEARBOX
18
OVERHAUL
Extension housings - Overhaul
Types A and B gearbox
1. Examine for damage to threads and machined
faces.
NOTE: Types A and B gearbox extension
housing shown.
2. Remove 3 screws and remove oil pump,
remove and discard ’O’ ring.
3. Remove oil pick-up pipe and check for
obstruction.
4. Drift out layshaft support bearing.
5. Remove and discard output shaft rear oil seal.
6. Drift out output shaft support bearing and oil
pick up ring.
7. Unscrew reverse inhibitor shaft.
8. Remove reverse inhibitor cam and spring.
9. Remove reverse light switch and sealing
washer, discard sealing washer.
10. Remove gate plate.
11. Check all components for wear and renew as
necessary.
Type C gearbox - As for A and B Types and
including the following:
12. Recover speedometer drive gear and spacer.
13. Check speedometer drive gear for wear and
damage, renew if necessary.
14. Check speedometer pinion for wear and
damage. Check that scrolling on shaft is clear;
renew pinion and shaft if necessary.
15. Check slots in interlock spool for wear, renew
interlock spool if necessary.
Type C and D gearboxes
CAUTION: The output shaft rear oil seal
fitted to Type C and D extension housings
is different to Types A and B. When
levering out seal, take care not to damage the
seal location surfaces.
NOTE: Type D gearbox extension housing
shown.
1. Remove and discard output shaft oil seal.
2. Remove 3 screws and remove oil pump,
remove and discard ’O’ ring.
