Thwaites SPRITE NIMBUS, Manual

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SERVICING 40M-3 GEARBOX - SPRITE/NIMBUS MODELS
DISMANTLING THE FRONT EXTENSION HOUSING:
1. Support the extension housing on the underside of the flange with a suitable ring
which will permit the input shaft (item 26) and bearing (item 23) to pass through.
Press the input shaft through from the driven end.
2. Removal of the input shaft will permit spacer (item 15) and ‘0’ ring (item 16) to be
removed.
3. By inverting the extension housing and supporting it such that the oil seal (item 17)
and bearing (item 18) may pass through and by using a drift slightly smaller than the
bore of the housing, the bearing and oil seal may be pressed out.
4. The bearing (item 23) can be removed from the input shaft by removal of circlip
(item 24) and the spacer (item 25) and supporting the bearing by a cylinder which
permits the input shaft to be driven freely through.
5. The front extension housing is re-assembled in a reverse manner to that described
above with new ‘0’ ring and oil seals and bearings (where necessary).
6. All parts to be fitted must be cleaned thoroughly. Ensure gearbox rotates freely in all
speeds.
7. Before placing into service the gearbox requires filling with 1½ pints of oil.
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