(1) Position chassis on level surface with front end resting on landing gear.
(2) Jack up chassis and support under rear corners.
(8) Remove eight hex nuts (23), Iockwashers (22) and hex head bolts (21, fig. 4-69) which secure the
trunnion tube to brackets riveted to chassis frame. Lift out trunnion tube with brackets attached.
b. Cleaning, Inspection and Repair.
(1) Cleaning. Clean mud and dirt from trunnion tube with water and stiff brush. Remove grease from
spindles of tube and retaining parts with dry cleaning solvent (PD-680) (item 18, Appendix C).
(2) inspection and repair. Check bearing seats and oil seal wiper for roughness or damage (refer to
para. 5-19 for
wear limits of bearing
spots, burrs or roughness.
Check threads or spindles of tube for wear, crossed threads or damage. Using fine file, file off
burrs or hand-chase threads if necessary. Check tube for bend. Spindles of tube which are bent, but
but not cracked, can be straightened. Carefully cut badly damaged oil seal wiper with a chisel and
remove. Use wiper replacer (fig. 4-33) to drive new wiper into place. Frame bearing surface on
both tube brackets must be on same plane. Check with straightedge across both brackets. Check
holes in brackets for wear (refer to para. 5-19 for wear limits). Should brackets be out of line or
holes in bracket worn to extent that bolts do not fit tightly, replace with new tube.
(1) position trunnion tube (9, fig. 4-69) on brackets riveted to chassis frame and secure with eight
3/4-16NF-3 X 5-3/8 hex head bolts (21), 3/4 Iockwashers (22), 3/4-16NF-3 hex nuts (23).
To install a new trunnion tube, mounting holes in new brackts on the tube
must be line-reamed in position to 1.125 to 1.128-inch diameter.
(7) Remove blocking and jacks and return semitrailer to level position,