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Setting Up The Crownwheel And Pinion
Section F
A) When a new Spiral Bevel Pinion is fitted.
Assemble the pinion and bearings into the cartridge and adjust the bearing preload as
described on Section A, note the Mounting Distance “MD” stamped on the front face of
the old and new bevel pinons.
The shim pack thickness used with the old pinion must be adjusted to suit the new bevel
pinion as follows:-
a) If the new MD is less than the old figure decrease the shim pack thickness by the
difference.
b) If the new MD is greater than the old figure increase the shim pack thickness by the
difference.
Fit the correctly sized shim pack to the face of the pinion cartridge, coat the mating
surfaces with one of the recommended sealants and assemble the cartridge onto the
main casing.
B) When the old MD is not available or a new Pinion Housing is fitted.
Assemble the pinion and bearings into the cartridge and adjust the bearing preload as
described in Section A.
Using a depth gauge or other suitable measuring instrument accurately measure from the
front face of the pinion to the mating/joint face on the pinion cartridge flange, this is
dimension “X”.
Assemble and seal one of the brake cylinders into the main casing, if new differential
support bearings are to be fitted, fit the bearing cone and adjusting ring nut. Stand the
case on the cylinder and lower in the differential assembly. Seal and install the second
brake cylinder, fitting the bearing cone and ring nut. Equally adjust ring nuts until all the
end float is removed from the differential bearings.
Using a depth guage or other suitable measuring instrument accurately measure from the
pinion cartridge flange surface to the ground diameter on the differential assembly. This
is dimension “Y”.
Read both the Pinion Mounting Distance “MD” and the Pinion Head Thickness “HT”
stamped on the front face of the pinion and use the following calculations to determine
the shim pack thickness required.
a) MD - HT - 129.50= “A”
2
(129.50 equals the differential case ground diameter)
B) Dimension “ Y ” - Dimension “X” = “B”
C) “A”-"B", the resulting figure is the thickness of the shim pack to be placed between the
pinion cartridge and centre casing.