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FINAL DRIVE 51-4 DESCRIPTION AND OPERATION Front Differential – Exploded View
FINAL DRIVE DESCRIPTION AND OPERATION 51-5 1 O-ring seal 2 Bearing pre-load spacer 3 Bearing cup 4 Taper roller bearing 5 Casing screws (12 off) 6 Dowel (2 off) 7 RH Casing 8 Gasket 9 Crown wheel gear screws (10 off) 10 Carrier 11 Pinion gear and shaft assembly 12 Oil slinger 13 Taper roller bearing 14 Bearing cup 15 Oil baffle 16 Collapsable spacer 17 Bearing cup 18 Roller bearing 19 Oil seal 20 Deflector 21 Seal deflector 22 Input flange 23 O-ring seal 24 Pinion nut 25 Oil seal 26 Cap 27 Vent 28 LH Casing 29 Information label 30 Filler/Level plug 31 Drain plug 32 Crown wheel drive gear 33 Roll pin 34 Thrust washer 35 Dished plate 36 Sunwheel 37 Shaft 38 Planet gear 39 Thrust washer.
FINAL DRIVE 51-6 DESCRIPTION AND OPERATION Front Differential – Sectional View 1 Crown wheel gear screw (10 off) 2 Planet gear 3 Taper roller bearing 4 Sun wheel (RH drive shaft output) 5 O-ring seal 6 Roll pin 7 RH casing 8 Input flange 9 Pinion nut 10 Oil seal 11 Taper roller bearing 12 Collapsable spacer 13 Taper roller bearing 14 Pinion gear 15 Planet gear 16 Oil seal 17 Taper roller bearing 18 Sun wheel (LH drive shaft output) 19 Shaft 20 Crown wheel drive gear 21 LH casing 22 Carrier The differential comprises a pinion shaft and hypoid bevel gear, a crown wheel drive gear with an integral cage which houses two planet gears. Two sun wheels are also located in the cage and pass the rotational drive to the drive shaft shafts. The pinion shaft is mounted on two opposed taper roller bearings with a collapsable spacer located between them. The spacer is used to hold the bearings in alignment and also collapses under the pressure applied to the pinion nut. This allows the nut to be tightened to a predetermined torque, which collapses the spacer, setting the correct bearing preload. The pinion shaft has an externally splined outer end which accepts and locates the input flange, which is retained by the pinion nut. The opposite end of the output flange has an internal spline which provides positive location for the front propeller shaft. The flange has an external O-ring seal which seals against the front propeller shaft shroud preventing the ingress of dirt and moisture into the splines. An oil seal is pressed into the LH casing and seals the input flange to the differential unit. The pinion shaft has a hypoid bevel gear at its inner end which mates with the crown wheel drive gear. The crown wheel drive gear is located on the carrier and secured with ten screws. The carrier is mounted on taper roller bearings located in each casing half. The bearings are press fitted into the casing and a spacer is located on the outside face to apply preload to the bearing. M51 0149