Section 5 - Troubleshooting
68 SCHWARZE HYPERVAC HV-18 revised 11/18
5.4 Troubleshooting the Hydraulic System
Problem Possible Cause Remedy
Extreme Heat, Unusual Noise,
or Poor Performance From
The Pump
Reservoir cap is not vented Replace cap with vented equivalent
Dirty Hydraulic oil Remove lters and clean or replace; change oil
Low oil level Check oil and ll as needed.
Bad pump Repair or replace pump
Bad hydraulic motor Rebuild or replace motor
Hydraulic System Will Not
Operate
Mechanical pump not being powered Engine must be operating; determine reason
pump is not being driven and repair accordingly
Directional valve faulty or has poor ground Check electrical components or replace valve
Major leak in hydraulic system Repair leak
Hydraulic pump pressure too low Adjust pump pressure (relief valve in manifold)
Leaking cylinders seals Replace seals or seek service
Adjust the pressure setting (release pressure) on counterbalance valves.
Clockwise reduces pressure setting. Counterclockwise increases pressure setting. The two relief valve
cartridges in the dump sequencing manifold must be balanced at 2750 psi setting.
NOTE
IMPORTANT
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