4-31. FRONT AND REAR SUSPENSION - Continued
(1) To gain access to the shock absorbers, the truck wheel(s) have to be removed. To make
replacement easier, the weight of the truck should be on the spring. The truck can:
be jacked and supported on maintenance trestles under the front (or rear) axle, (see para. 4- 29.1), or:
(b) be supported on maintenance trestles under the frame, and then jacked under the axle until nearly
all the truck weight is on the front (or rear) spring(s).
(2) With the truck supported as above, remove wheel(s) from axles, depending which shock absorber
is to be replaced. It is easier to replace one shock absorber at a time. If both shocks on a single
axle are to be removed, repeat the following for each shock absorber.
Remove nut (7) and washer (8) from lower end of shock absorber. Discard locknut.
Drive out lower bolt (13) ensuring drift does not damage bolt threads or score inner bushing (11).
(5) When bolt is free of shock absorber remove washer (10), spacer (12), shock absorber bushing
(9), and spring bushing (11). The spring bushing may require use of puller to remove. Use puller
with land diameter of 1 in. (2.5 cm) to push spring bushing out of spring.
(6) Repeat (3, 4, and 5), for upper end of shock absorber (There is no removable spacer or spring
bushing in upper end).
(1) Inspect shock absorber for signs of corrosion and leaks. The skirt should not be severely
corroded, any holes are cause for rejection.
Check the connecting rod. It should be bright and clean and should have no score marks.
(3) Generally, shock absorbers should be replaced if they are ever removed from the truck unless
they have been in service less than 1 year.
(4) Check shock absorber upper and lower bushings for corrosion and wear. Both inner and outer
surfaces should not be scored.
(5) Check spring bushing for corrosion and wear. Outer surface should not be heavily corroded.
Inner surface should not be scored or corroded.
(1) Install lightly oiled bushing (3) in upper end of shock absorber (6) (This is the large end of shock
absorber) Use gear oil (Item 15, Appendix E).
Install upper retaining bolt (1) into frame. (Head outboard on front axle, head inboard on rear axle).