TM9-2320-361-34 Table 2-1. Mechanical Troubleshooting (Contd). MALFUNCTION TEST OR lNSPECTlON CORRECTIVE ACTION DUMP BODY (M342A2) 49. DUMP BODY WILL NOT RAISE Step 1. Step 2. Step 3. Step 4. Step 5. Step 6. Step 7. Step 8. 2-24 WARNING ● Overhead lifting device capacity must exceed dump body weight. A shifting, swinging, or falling load may cause injury to personnel. . Bleed hydraulic pressure before cracking hydraulic lines. Failure to do so may result in damage to equipment and injury to personnel. Apply parking brake (TM 9-2320-361-10). NOTE Some vehicles may not be updated to use dump body hydraulic lock system. When vehicles do not have this system, substitute hydraulic hose will be needed to take the place of existing hydraulic hose on lock system called out in hydraulic system checks. Check hydraulic lock operation. Operate controls to raise dump body (TM 9-2320-361-10). Observe hydraulic lock operation. If hydraulic lock will not release, manually open hydraulic lock and secure in open position. Operate dump body to raise. If dump body raises, replace hydraulic lock cylinder or lock assembly (para. 16-13). Check hydraulic system for leaks. WARNING Use properly rated hydraulic hose when performing hydraulic system checks on vehicles not equipped with dump body lock. Failure to do this may result in injury to personnel. NOTE Tag hydraulic hose ends of hydraulic lock system before removal for installation. Attach overhead lifting device to dump body and secure dump body hydraulic lock. Raise dump body with lifting device until dump body is in fully raised position. Secure dump body with safety braces (TM 9-2320-36 1-10). Remove all hydraulic hose ends from upper and lower control box manifolds. Install tee fitting into one of three open ports of upper manifold and plug two ports in upper and lower manifold. Install high pressure gage into tee. Remove one hydraulic hose from lock cylinder and adapt ends so that one end can connect to tee and the other end to open port on lower manifold (para. 16-7). Operate dump body with main control lever set in D position (TM 9-2320-361-10). Maintain engine speed at 1,000 rpm for 10 seconds and observe pressure gage. If pressure reading is uneven or zero, replace hydraulic pump (para. 16-12). Check pump spacer for cracks or defects (para. 16-12). If spacer is cracked or defective, replace (para. 16-12). Replace control valve if pressure readings decrease slowly (para. 16-10).