TM 5-2420-230-24-1
Spicer Speciality Axle Division - Technical Publications
2
ROUTINE MAINTENANCE Cont.
2.3
Check permissible slackness in swivel (king) pins every 30000 miles (48000 km) as follows :-
Aspects to be considered are :-
a)
Lateral slackness.
b)
Vertical slackness.
Before commencing checks, apply parking brake, raise wheels off the ground and support axle on
stands.
a)
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-
square outboard.
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.
b)
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.
2.4
Replace brake pivot pin lockscrews (45- FH55) whenever brake is overhauled.
Spicer Speciality Axle Division
Page No.A4
Manual No. 1784 Issue B
A
J-28