TM  10-3930-638-24&P 2-36.   TRANSMISSION   TROUBLESHOOTING   (cont) MALFUNCTION TEST  OR  INSPECTION CORRECTIVE  ACTION 4. LESS OF DRIVE IN ALL RANGES (cont) Step  4. Step  5. (cont) With  an  assistant  in  operator’s  seat,  move  control  valve  assembly  direction  selector  spool  and  speed selector spool slowly through their entire range of travel. Movement of vehicle should be observed. a.  If  vehicle  moves,  adjust  transmission  linkage  controls  (para  2-38  b). b. If vehicle does not move, proceed to step 5. Disconnect and cap hose connected to control  valve  assembly  hydraulic actuator  assembly. Start engine and operate at idle speed and set parking brake. With an assistant in operator’s seat, move control valve assembly direction selector spool and speed selector spool slowly through their entire range of travel. Movement of vehicle should be observed. a. If vehicle does not move, replace control valve assembly (notify direct  support  maintenance) b. If vehicle moves, replace or adjust declutch valve (para 2-43d). 5.  LOSS  OF  POWER Step 1. Check for foamy oil (para 2-36, MALFUNCTION 1). Refer to paragraph 2-36, MALFUNCTION 1. Step 2. Remove parking brake drum (para 2-42b) and check for locked parking brake linings. a. If linings are locked in position, disassemble parking brake and inspect parts (para 2-42b); replace  defective  parts  (para  2-42b). b. If linings tire not locked in position. reinstall parking brake drum (para 2-42b) and proceed to step 3. Step  3. Place blocks (6 by 6 by 18 inches wood blocks) at each wheel to prevent vehicle from moving. Install shipping lock pin (para 2-4b(1)). Ensure that parking brake lever is in released position. 2-198