DRIVING & CHASSIS - TROUBLESHOOTING HS120V G5:9HM:=FGH 8F=J=B;7 756=B 9B;=B9 9@97HF=7GMGH9A =B89L 3 -18 GMW-0035 SYMPTOM CAUSE SOLUTION Faulty HST motor Cavitation occurred or piston off the cam due to excessively low charge pressure • Check the charge pressure according to the equipment specification. If necessary, adjust, repair, or replace the charge pump (closed circuit) or another source of charge pressure (open circuit). 2-Speed spool off the cam or partially moved (if equipped) • Check the case pressure according to the equipment specification. If the pressure is excessively high, check if the drain line is clogged.
2-Speed pool partially moved due to low 2-speed shift pressure (if equipped) • Check the 2-speed shift pressure according to the equipment specification. If the pressure is excessively low, adjust, repair, or replace the source of the pressure. 2-Speed spool partially moved and stuck in place (if equipped) • Check the 2-speed spool. If necessary, replace the spool and/or the motor housing. Motor hitting the frame and vibrating due to a loose motor mounting screw • Check that the motor mounting screw is properly tightened to the specification.
Wheel mounted improperly or abnormal load applied on the motor output shaft • Check that the wheels are properly mounted and loads are properly arranged according to the equipment specification. Hydraulic line hitting the frame and vibrating due to improper installation • Check if the line is properly installed according to the equipment specification. Internally damaged radial piston motor • Remove and check the motor. Replace any defective part. If necessary, replace the whole motor. Air sucked in • Bleed the hydraulic line completely. Check that all connections are properly tightened.
Brake not released fully, due to excessively low brake release pressure (if equipped) • Check the brake release pressure according to the equipment specification. If necessary, adjust, repair, or replace the source of the pressure. Excessive pressure fluctuation Internally damaged radial piston motor • Remove and check the radial piston motor. Replace any defective part. If necessary, replace the whole motor. Unbalanced or load changed • Check the load and load attachment according to the equipment specification, and then make any necessary adjustment.
Clogging or wrong size of the feed or return line • Check to ensure that the main lines for the motor A/B ports are not clogged and their sizes are according to the equipment specification. Excessive speed fluctuation Internal oil leakage due to internal motor damage • Remove and check the motor while being careful with the piston ring. Replace any defective part. If necessary, replace the whole motor. Defective pump or pump controller • Check the pump and pump controller according to the equipment specification. If necessary, adjust, repair, or replace them.