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TM 5-4210-220-12
4-31. FRONT AND REAR SUSPENSION - Continued
INSTALLATION
(1) Ensure eye bushings are in both ends of the spring.
(2) Place spring (8) in position with double leaf wrap toward front end of truck. Ensure middle of spring rests
on top of axle.
(3) Coat front spring pin (1) with engine oil (item 17, Appendix E). Align spring bushing with frame holes and
push pin in, with one locking slot down and grease fitting outboard. Do not drive pin with hammer as this
may damage grease fitting threads. If properly aligned the spring pin may be pushed in by hand.
(4) Coat spring pin (5) with engine oil (item 17, Appendix E) and insert into frame bushing. (Grease-fitting hole
inboard of frame).
(5) Coat second spring pin (5) with engine oil (item 17, Appendix E). Insert pin into spring rear bushing.
(Grease-fitting hole inboard of frame).
(6) Raise or lower jack beneath axle on which the spring is resting until the two rear spring pins line up with the
holes in the outboard shackles (6).
(7) Align spring pin locking slots so they are facing each other. Push outboard shackle (6) onto the spring
pins. If the shackle is a tight fit, hold a soft-headed hammer against the other end of one pin and tap the
shackle on that end. Repeat with the hammer against the other spring pin. Repeat until shackle is against
lip of both pins.
(8) Fit both locking bolts (7) to the shackle. Do not drive the locking bolts as this will damage the threads. If
they do not slide home, the pin locking slots are not aligned. Twist the pin from the other end until is
aligned. Locking bolt heads must be to front of shackle.
(9) Apply five drops of threadlock liquid (item 29, Appendix E) to locknuts (4) and install (5) fingertight on both
shackle locking bolts.
(10) Install inboard shackle, if necessary re-aligning the spring via the jack.
(11) Install both locking bolts (7) in inboard shackle. Apply five drops of threadlock liquid (Item 29, Appendix E)
to locknuts (4) and tighten to 75 ft lb (100 Nm). Locking bolt heads must be to front of shackle.
(12) Tighten locknuts (4) on rear outboard shackle to 75 ft lb (100 Nm).
(13) Install both locking bolts (3) in front spring pin (1) It may be necessary to re-align the spring via the jack.
Locking bolt heads must be to front of shackle.
(14) Apply five drops of threadlock liquid (Item 29, Appendix E) to locknuts (4) and tighten to 75 ft lb (100 Nm).
(15) Install grease fittings (2) on all three spring pins (1 and 5). Apply grease (Item 16, Appendix E) to each
shackle until it can be seen at the ends of that shackle.
4-589
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