Table 2-4. Tow Point Lift System Troubleshooting

TM 5-3895-373-34 2.9 TOW POINT LIFT SYSTEM. Table 2-4 lists common malfunctions associated with the tow point lift system that may be found during operation or maintenance of the paving machine. Perform the tests/ inspections and corrective actions for a particular malfunction in order given. This table cannot list all possible malfunctions that may occur, nor all tests, inspections, or corrective actions. If a malfunction is not listed, or is not corrected by listed corrective actions, notify your supervisor. Table 2-4. Tow Point Lift System Troubleshooting. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. TOW POINT CYLINDERS DO NOT OPERATE. NOTE The following tests may require use of a hydraulic system tester. Install tester in-line at pressure test point indicated by each individual test per TM 9-4940-468-14. Make sure all ratings of fittings and hoses used are adequate for maximum pressures and flows being tested. NOTE Ensure that shutoff valves on both tow point cylinders are fully opened. Step 1. Check if both tow point cylinders fail to operate per TM 5-3895-373-10. If both tow point cylinders fail to operate, go to step 2. If either tow point cylinder fails to operate normally, go to step 3. WARNING Hydraulic oil can be moderately flammable and can be an irritant to skin, eyes, and respiratory system. Avoid prolonged exposure. Eye protection and rubber gloves must be worn when working with hydraulic oil. Step 2. Open center top right and center top left access doors per TM 5-3895-373-10. Open left access door per TM 5-3895-373-10. Install hydraulic system tester at outlet (2) for flow test per TM 9- 4940468-14. Check flow rate at tow point control valve outlet (2) to flow control valve outlet tee with flow control valve fully closed, clockwise. Flow control valve is normally opened, counterclockwise, during machine operation. If flow is present with flow control valve closed, replace tow point flow control valve per paragraph 2.55 and repair per paragraph 2.50. If no flow is detected, refer to MALFUNCTION 3. AUXILIARY HYDRAULIC SUPPLY TO VIBRATION AND CYLINDER CIRCUITS FAULTY. 2-33