DS 19 OPERATION No. DS 330-3 : Overhauling a gearbox. Op. DS 330-3 195
PARTICULAR POINTS
Dismantling.
After having disconnected the clutch housing from the gearbox casing, remove the outer differential bearing races sideways, the centre of the
differential is not on the line of the joint between the clutch bellhousing and the gearbox casing.
The needle bearing assemblies of the intermediate train are not of the same length, mark before dismantling.
To remove the assembly of the retaining washer and thrust washer, heat the thrust washer to 2000 C (using a blow pipe fitted with a 150 to
200 litre nozzle). Only carry out this operation if the washer assembly is to be renewed (scratches or loose).
Assembly.
23 To prepare the clutch housing
The rear-end of the clutch thrust guide stud should be set at a distance “b” = 97 ± 1 mm from the face of the joint with the engine. (see Pl.
58, fig. 2).
Do not refit the oil tube, if one existed when dismantling.
Adjust the position of the driving pulley (see Op. DS 231-0).
24 To prepare the gearbox cover:
Calibrate the fork return springs: Length 68 mm, under load of 245 to 26 kg.
25 To prepare the differential:
Lateral clearance of planet wheels = 0.30 mm maximum.
Lateral clearance of satellites = 0.30 mm maximum.
Tighten the screws fixing the crown wheel to 47 to 50 ft/lb (6.5 to 7 m.kg). Do not fit lockplates under the screw heads, fit an iron locking
wire through the heads of the screws in a manner to stop unscrewing.
26 To prepare the differential shafts
(a)Rectify the brake discs (shaft mounted between centres) by grinding or using a facing tool. Avoid removing in order to rectify the second
face.
(b) Maximum run-out at the greatest diameter = 0.17 mm. Difference in thickness at any point on the disc 003 maximum. Do not reduce the
original thickness of the disc (original thickness 12 ± 0.1 mm) by more than 1 mm.
27 To prepare the shaft and housing assemblies.
The differential shaft and housing is shorter on the right-hand side.
(a) Tighten the slotted nut locking the bearing to 72 ft/lb (10 m.kg) (spanner 1771- T).
(c) Fit the housing assembly (fitted with the bearing and oil seal) and support arm on the differential shaft, using a press.
(d) Tighten the nut on differential shaft to 72 ft/lb (10 m.kg) (spanner I 770-T).
To Next Page
Loading...
