TM 9-2320-273-20
Table 6-1. Transmission Troubleshooting Procedures (Continued).
MALFUNCTION.
TEST OR INSPECTION.
CORRECTIVE ACTION.
2.
ENGINE DOES NOT TURN DRIVESHAFT IN ANY SPEED FORWARD OR REVERSE
(Continued):
Step 5.
Check to see that air pressure is available at ratio selector from truck
compressed air system.
a.
Troubleshoot compressed air system ( para 9-5).
b.
Refer to Direct Support Maintenance for troubleshooting.
3.
ENGINE TURNS DRIVE SHAFT IN SOME GEARS BUT NOT OTHERS:
Step 1.
Check to see that adequate compressed air is available from truck.
Troubleshoot compressed air system (para 9-5).
Step 2.
Check air control line and connections between ratio selector and
transmission for tight connections, damage and leaks.
a.
Tighten to 18 Ib-ft (24 N•m) or replace damaged
components.
b.
Refer to Direct Support Maintenance for troubleshooting.
4.
ENGINE DOES NOT TURN POWER TAKEOFF IN NEUTRAL :
Perform same steps as in Malfunction 2.
5.
TRUCK MOVES WHEN ENGINE IS AT LOW IDLE AND TRANSMISSION IN GEAR :
Step 1.
Check engine low idle rpm (should be 580-620 rpm).
Refer to Direct Support Maintenance for adjustment.
Step 2.
Check transmission operating temperature.
Allow transmission temperature to reach 10O°F (37.8°C)
before putting truck in gear.
Step 3.
Put selector lever in NEUTRAL and check engine rpm at low idle.
Put selector lever in 4th gear and check engine rpm.
a.
If engine rpm does not change, the problem is corrected.
b.
If engine rpm decreases, the input clutch may be warped.
Refer to Direct Support Maintenance for repairs.
6-4
