R380 Manual Gearbox Overhaul
MANUAL GEARBOX
DESCRIPTION AND OPERATION
1
DESCRIPTION
The R380 5 speed all synchromesh gearbox
comprises an input shaft, output shaft, layshaft and
reverse idler shaft .
Gearbox casings consist of a front cover, gearcase,
centre plate and extension housing, all casings are
located by dowels and sealed.
Selector forks for 1st/2nd and 3rd/4th gears are
located on a single selector shaft inside the main
gearcase whilst the selector fork for fifth and reverse
gear is located on the same selector shaft inside the
extension housing.
The input shaft, output shaft and layshaft are
supported by taper roller bearings with all gears
running on caged needle roller bearings. Output
shaft and layshaft bearings end float is controlled by
selective thrust washers located in the centre plate.
Lubrication is by an oil pump located in the
extension housing which directs oil via internal
drillings in the output shaft to lubricate the
components.
1. Output shaft 1st gear
2. Output shaft 2nd gear
3. Output shaft 3rd gear
4. Input shaft/4th gear
5. Output shaft 5th gear
6. Layshaft
7. Output shaft
8. Oil pump
9. Oil filter
10. Breather
11. Single rail gear selector
12. 1st/2nd synchromesh
13. Oil seals
14. 3rd/4th gear synchromesh
15. 5th/reverse gear synchromesh
16. Selective spacers (output shaft and layshaft
end float)
17. Selective spacer (5th gear/reverse hub)