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Select a shim pack of the correct thickness and fit to the pinion cartridge, slacken the
differential bearing adjusting ring nuts and install the pinion cartridge to the maincase
ensuring the crownwheel and pinion are correctly meshed. Retain the pinion cartridge to
the main case using two setscrews.
Retighten the adjusting ring nuts to take up the differential bearing end float and lightly
preload the bearings, adjust both ring nuts to give the correct backlash between the teeth
on the crownwheel and pinion:-
1410 Hardy Spicer 4 Bolt Flange 0.31 - 0.39mm
The backlash is best checked via a dial indicator clock located against a drive flange hole
or located against the head of a nut and bolt which is secured in one of the holes within
the flange.
Equally tighten both ring nuts by the same amount to give the correct bearing preload (it
is important that the backlash is maintained).
The preload is measured by winding a length of string around the pinion flange and
measuring the load required to turn the flange with a suitable spring balance.
Differential Bearing New Bearings Old Bearings
Preload
7.5-9.9Kg 3.65-5.3Kg
(16.5lbs-21.80lbs) (8.00-11.7lbs)
After setting the differential bearing preload recheck the crownwheel/pinion backlash.
Remove the pinion cartridge assembly and brush some “Engineers Blue” onto a few
crownwheel teeth and refit the pinion cartridge. Rotate the pinion flange a few complete
rotations in both directions and remove the pinion cartridge.
Examine the contact markings on both flanks of the crownwheel teeth and compare the
markings to the illustrations in Section G or the original factory markings.
If the marking is different refer to section G “Sprial Bevel Tooth Contact” and make the
necessary adjustments.
Coat the mating surfaces of the main casing and pinion cartridge with the recommended
sealant and fit the cartridge.
Secure the adjusting ring nuts using the locking devices, coating the threads on screws
with loctite. Re-assemble the remainder of the axle as described in Sections C, D and E.