Troubleshooting (Turning Motor) 20-117 Fault Cause Troubleshooting Motor doesn’t run 1. Dust or the oil is too dirty, radial load of shaft and shaft sleeve is too large and motor is clogged. 2. No pressure. 3. Motor internal leak. 1. Turn the motor and test the oil pressure. 2. Check the pumps and valves in the entire circuit. 3. Exchange the motor The rotation speed of motor is different with the setting value 1. The oil of motor is not enough. 2. The axle temperature increases and hydraulic oil leaks and the viscidity reduce. 1. Check the flow rate of pump and motor, check the output volum in idling condition and check the drain flow of valves. 2.
Use the oil with normal viscidity or use the normal oil temperature to drive. The rotation speed of motor is deviated 1. Pipeline is wrong. 2. Speed adjusting is wrong. 1. Adjust pipeline 2. Change speed adjusting (means the re-installed items) Shaft seal leaks 1. Sealing elements were worn or damaged 1. Change sealing elements. Leak between flange and flange surface 1. The flange connection is too loose. 2. The O ring between flange and flange surface is damaged or the flange is damaged. 3. The connection seal leaks oil. 1. Re-tight (tightening torque: 26-32 Nꞏm) 2. Check O-ring for scratch or bur and check the working surface of O-ring on the flange surface. 3. Change O-ring.
Leak from rear cover 1. The bolt of bottom cover has loosened. 2. The O-ring is worn or damaged. 3. Contacting area has dirt. 4. Contacting area has concave slot or crack. 1. Tight 7 bolts (Tightening torque: 32-35 Nꞏm); 2. Replace O-ring; 3. Clean and reassemble it. 4. Grind the contacting area with 6# sand paper to smooth it. The installed flange have crack (4 bolted flanges) 1. Result from the installation method 1. Change flange or use the normal bolt to tight. Holes leak 1. Improper connection 2. Screw is damaged 3. Flange surface has crack 1. Re-connect 2. Change flange surface. Abnormal sound 1. The axle is installed wrongly; 2. Air in the pipeline or motor; 3. Pump has clearance 4.
Motor has clearance 5. Air in the oil inlet pipe 1. Reinstall 2. Exhaust 3. Exchange pump 4. Exchange motor 5. Exhaust Abnormal temperature raise 1. Cooling system is abnormal; 2. The capacity of oil tank is not enough 3. The pressure is too high 4. Using swing mechanism frequently 1. Check and repair cooler; 2. Increase capacity or cooler 3. Adjust the overflow valve to normal pressure.