DRIVING & CHASSIS - TROUBLESHOOTING HS120V G5:9HM:=FGH 8F=J=B;7 756=B 9B;=B9 9@97HF=7GMGH9A =B89L 3 -20 GMW-0035 SYMPTOM CAUSE SOLUTION Expected output speed cannot be achieved. Insufficient hydraulic flow built in the pump • Check the engine speed and pump flow. If necessary, adjust, repair, or replace the engine or pump. Excessive oil leakage from the motor • Remove and check the motor. Replace any defective part. If necessary, replace the whole motor. 2-Speed pool partially moved or not moved at all sometimes due to low 2-speed shift pressure (if equipped) • If the spool moves properly according to the equipment specification, check the 2-speed shift pressure.
If the pressure is excessively low, adjust, repair, or replace the external control valve for 2-speed operation. If necessary, check if the line is clogged. 2-Speed spool partially moved or stuck in the original place (if equipped) • Remove the 2-speed valve and check all of the components, including the bore of the motor housing. Remove any foreign material. If necessary, replace any necessary component or the motor housing. The motor does not rotate. The motor torque is achieved, but the load exceeds the motor torque. • Check the system pressure. If the pressure is increased up to the relief valve setting value, reduce the load applied on the motor.
The expected motor torque is not achieved, and the load exceeds the motor torque. • Refer to the instructions for “Insufficient output torque or draft force” in the troubleshooting section. No oil supplied to the motor • Check the engine speed, pump oil flow, and control valve operation. If necessary, adjust, repair, or replace the engine, pump, or valve. Impossible to release the brake • Refer to the instructions for “Impossible to release the brake” in the troubleshooting section. The motor rotates in the incorrect direction. Incorrectly connected oil feed connection for the motor • Connect the oil feed connection correctly. The hydraulic oil temperature is excessively high.
Overheated motor • Check the cooling system and flushing valve. Malfunctioning pressure control valve (example: relief valve and pressure controller) • Check the corresponding component, and then repair or replace it as necessary. Excessively high output speed • Check the motor speed according to the equipment specification. If the speed is excessively high, reset the pump and/or engine speed. Flushing valve closed due to excessive high motor case discharge pressure • Check the case pressure according to the equipment specification. If the pressure is excessively high, check if the drain line is clogged.