Table 10-3. Suspension Troubleshooting Procedures (Continued)
TEST OR INSPECTION.
PUSHER AXLE WILL NOT RAISE OR LOWER:
Check air bags for damage and leakage by listening for a hissing sound or using a
soap solution and watching for bubbles.
Replace air bags (para 8-14).
Check air lines for leakage using a soap solution.
Replace lines (para 8-14 and 8-15).
Check lifting bags for damage.
Replace defective bags (para 8-15).
Inspect all brackets and connecting arms for bends or other damage.
Refer to Direct Support Maintenance.
Check control valves for damage and leakage using a soap solution with valve under
pressure. A 1-inch bubble in 5 seconds is permissible.
Tighten connections and/or replace the control valves (para 8-17 pusher axle
pressure regulator valve, or para 8-18 pusher axle up-down selector valve).
Check shock absorbers for damage and tight mounting.
Tighten or replace (para 10-25).
REAR AXLE ASSEMBLY NOT TRACKING PROPERLY:
(M915, M916, M920). Check fifth wheel for secure mounting. This step applies only
if a trailer is attached.
Tighten, refer to torque table, para 3-9.
Check torque rod for security and damage.
Tighten (105 Ib-ft (142 N-m) for the M915, 180 Ib-ft (244 N-m) for the M916 thru
M920), or replace (para 10-26).
Check for dragging brake by jacking vehicle and rotating wheels by hand.
Adjust or replace (para 9-33, 9-34). Refer to Direct Support Maintenance.