(2) Inspection and repair. Inspect each leaf for
cracks or breaks. Note whether excessive
at contact of spring bearing plate. Replace
complete spring assembly, if any leaves
are defective. Make sure rivets (2, fig.4-66)
hold clips (1 and 5) tightly. Check leaf
clips for cracks. Cut out and replace any
defective 3/8 X 5/16-inch button head
1. Leaf clip, small
5. Leaf clip, large
6. Bolt, center
d. lnstallation. Install springs by following pro-
3. Nut, hex
7. Nut, hex, center
4. Bolt, hex head
8. Clip spacer
semitrailer to ground and remove jacks.
a. Removal. Position semitrailer on level surface with front end resting on landing leg. Jack up each rear
axle so wheels on side from which spring seat is to be removed can be taken off. Place jacks or hydraulic
dolly under trunnion tube and take up weight. Block up semitrailer. Remove wheels (fig. 4-24) and loosen
springs from spring seat (fig. 4-65, steps 1 thru 4); then remove spring seat and bearings by following proce-
b. Cleaning, Inspection and Repair.
Cleaning solvent (Fed Spec PD-680) is toxic and flammable. Use solvent only
in a well-ventilated room. Avoid prolonged breathing of solvent vapors. Keep
solvent away from flame. Do not use solvent in excessive amounts.
(1) Cleaning. Wash spring seat and bearings thoroughly with dry cleaning solvent (PD-680) (item 18,
(2) Inspection and repair. Inspect spring seat for cracks or other indications of damage. Replace if
damaged. Inspect bearing cups for cracks, chipped spots, or wear caused by contact with bearing
rollers. Make sure cups fit tightly in seat. If cups are damaged or worn, replace them. Oil cone
and roller bearing assemblies lightly and rotate by hand to test serviceability; replace if there is
evidence of scoring, pitting or wear. Inspect oil seal to make sure contact material is intact and
c. Installation. Lubricate cone and roller bearing assemblies, and spring seat in accordance with lubrication
chart (fig. 4-1). Install spring seat and bearings by following procedures shown in steps 9 thru 16 of fig. 4-67.
Secure spring to spring seat (fig. 4-65, steps 7 thru 10); install wheels (fig. 4-24); remove blocks, lower semi-
trailer to ground and remove jacks.