High-Pressure Cylinder and Check Tube
Bronze backups have short life.
Worn plunger bearing. Replace plunger bearing.
Cylinder end drips and is hot.
Check for crack at end of HP
cylinder.
Replace HP seals and hoops and HP cylinder if necessary.
Check valve is hot and HP cylinder end drips.
Check for crack in check valve
body.
Replace HP seals and hoops and check valve body if necessary.
Check valve is hot and HP cylinder end does not drip.
Leaking HP poppet and seat. Replace.
Leaking LP poppet and check
valve body face.
Replace or repair.
End of HP cylinder drips.
Worn HP seal. Replace HP seals and hoops.
Hydraulic center section is much hotter than hydraulic oil.
Piston seal is worn. Rebuild center section.
Piston seal has just been replaced
and needs breaking in.
No action required.
HP seal is short.
Poor mating surfaces. Inspect, repair and/or replace HP cylinder ID and plunger.
Pump has cycled roughly. Start-up new seals carefully.
Pump over cycled. Check demand on pump.
Worn bronze back-up or bearing. Replace backup or bearing.
Cylinder end too hot.
Correct problem. Refer to the
section of
the manual.
Hoops are broken from belled out
HP cylinder end.
Replace HP cylinder when necessary.
Oil present in dynamic end of HP cylinder.
Leaky hydraulic rod seal. Replace rod seal.
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