Troubleshooting
Symptom Probable Cause(s) Corrective Action
Pump does Leak in suction line Check hose and fittings for leaks and correct
not prime Obstruction in suction line Inspect hose for obstructions such as debris or loose
inner liner and remove from the line
Suction hose sucked to bottom Cut a notch or “V” in end of suction hose
or side of tank
Rollers stuck in pump Disassemble pump and inspect rollers
Pump seals leaking air Replace seals
Pump turning in wrong direction Correct rotation of pump
Loss of pressure Clogged suction strainer Check strainer and clean regularly
Kinked or blocked suction hose Inspect suction hose and repair as necessary
Air leak in inlet side plumbing Check hose and connections for leaks. Use pipe
joint sealant and retighten connections
Relief valve setting too low Check relief valve and correct setting or replace
or weakened spring spring
Faulty gauge Replace gauge
Pump seals leak air Replace seals
Nozzle orifices worn Replace Nozzles
Pump worn Repair pump (See Repair Instructions)
Pump will not turn Corrosion (rust), scale or residue Replace pump
Solid object lodged in pump Disassemble pump and remove objects
Hydraulic system Improper hydraulic motor size Refer to Pump Selection Guide to determine proper
overheating size for your hydraulic system.
Insufficient hydraulic hose size Check hydraulic hose size. Hose should be at least
1/2” (12.7mm). For large open-center systems, hose
should be 3/4” (19.05mm).
Troubleshooting Guide
Table 2
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Before attempting to service your pump, be sure that it is disconnected from all energy sources.
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