Table 5-2. Direct Support Troubleshooting-continued -706880688

TM 5-4210-233-14&P-1

Table 5-2. Direct Support Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

TRANSMISSION - Continued

AUTOMATIC SHIFTS OCCUR AT TOO HIGH A SPEED - Continued

Step 7. Valve is sticking. Back off spring adjustment ring to specification.

Step 8. Improper modulator. Check modulator valve and modulator body.

AUTOMATIC SHIFTS OCCUR AT TOO LOW A SPEED - FULL THROTTLE

Step 1. Governor spring weak or missing. Replace governor.

Step 2. Mechanical actuator kinked, broken, or not properlyadjusted. Replace, adjust, or repair

cable. Full modulator travel must correspond with full throttle.

Step 3. Shift signal valve spring adjustment too loose. Tighten spring adjusting ring to specification.

Step 4. Modulator valve stuck open. Check spring adjustment clean or replace modulator valve.

ROUGH SHIFTS

Step 1. Governor valve malfunctioning. Clean or replace governor screen and/or governor.

Step 2. Vacuum modulator valve hose kinked or leaking. Replace hose, check spring adjustmen.

Step 3. Mechanical actuator cable kinked, broken, or not properly adjusted. Replace, adjust,

or repair cable. Full modulator travel must correspond with full throttle.

Step 4. Mechanical actuator malfunctioning. Replace actuator.

Step 5. Vacuum modulator failed. Replace vacuum modulator. Be sure that O-ring is installed.

Step 6. Trimmer valve sticking (broken spring). Replace or rebuild control valve body assembly.

Step 7. Control valves sticking. Replace or rebuild control valve body assembly.

Step 8. Modulator valve sticking. Clean valve. Check vacuum modulator, adjust spring.

Step 9. Engine idle speed too fast (N to D). Adjust engine idle screw.

Step 10. Selector linkage out of adjustment. Adjust linkage.

Step 11. Vacuum modulator valve spring not adjusted properly. Adjust spring.

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