Spicer Speciality Axle Division - Technical Publications
ROUTINE MAINTENANCE Cont.
Check permissible slackness in swivel (king) pins every 30000 miles (48000 km) as follows :-
Aspects to be considered are :-
Before commencing checks, apply parking brake, raise wheels off the ground and support axle on
Checking lateral slackness
Whilst this is being carried out the brake must be applied.
Place a set-square with its stock on ground and its blade against the tyre wall.
Place a mark on the ground to indicate position of stock end.
Insert a lever through bottom cut-out of wheel and lever it upwards thus moving set-
Mark the changed position of the stock end.
Maximum allowable stock displacement (for 22" wheels) is 8mm.
If displacement exceeds 8mm then the need for bush / bearing attention and possible
renewal, is in evidence.
Checking vertical slackness
This is measured by a dial indicator anchored to the axle beam and having its pointer
placed vertical against the swivel top.
Place a jack against the underside of the swivel and, whilst applying a lifting force,
observe any movement on indicator dial.
If vertical movement is evident and it exceeds 0.030" (0.76mm) then re-adjustment of
swivel is required.
Replace brake pivot pin lockscrews (45- FH55) whenever brake is overhauled.
© Spicer Speciality Axle Division
Manual No. 1784 Issue B