Specifications

19
Hydraulic System Troubleshooting
Additional troubleshooting info is available in the appendices covering individual
components.
Problem Corrective action
Pump excessively noisy.
Suction side plumbing is restricted or
blocked.
Insure that no foreign matter is blocking
the tank outlet by removing the access
hatch and looking inside.
Verify suction shutoff valve is wide open.
Viscosity of oil is too high. Change the oil to a lower ISO VG grade.
Air in suction side. Pour oil over suction side fitting
connections. If noise stops, disassemble
fittings, re-tape and re-assemble.
Loose or worn out parts. Verify assembly is properly tightened,
replace worn out parts.
Hydraulic system overheating.
Insufficient cooling air. Verify air flow rate is unobstructed. Open
needle valve fully.
Relief valve setting too high. Reset relief valve to a maximum of 2500
psi.
Viscosity of oil is too low or too high. Change the oil.
Excessive internal leakage. Check parts for wear and repair or replace
as necessary. Check for contamination and
clean out crud as needed.
Excess friction. Check the moving parts inside the pump
for tightness and proper fit. Repair as
required.
Leaks in pump, high volume check valve,
unloader valve, relief valve.
Repair or replace.
Dirty heat exchanger. Clean out oil and air passages.
Excessive wear of moving parts
Abrasive contaminants in oil. Clean and flush system. Replace filter
element. Clean breather. Replace fluid.
Engine to pump alignment off. Verify fastener tightness. If OK, replace
motor to pump housing and coupling.
Operating pressure is set too high. Reset relief valve lower, to a maximum of
2500 psi.
Viscosity of oil is too low. Change oil to a higher ISO VG grade.
Leakage of air into the system. Pour oil over suction side fitting
connections. If the oil disappears,
disassemble, re-tape and re-assemble.