Hypertherm HyPrecision 100D Instruction Manual page 70

High-Pressure Cylinder and Check Tube
Bronze backups have short life.
Worn plunger bearing.
Cylinder end drips and is hot.
Check for crack at end of HP
cylinder.
Check valve is hot and HP cylinder end drips.
Check for crack in check valve
body.
Check valve is hot and HP cylinder end does not drip.
Leaking HP poppet and seat.
Leaking LP poppet and check
valve body face.
End of HP cylinder drips.
Worn HP seal.
Hydraulic center section is much hotter than hydraulic oil.
Piston seal is worn.
Piston seal has just been replaced
and needs breaking in.
HP seal is short.
Poor mating surfaces.
Pump has cycled roughly.
Pump over cycled.
Worn bronze back-up or bearing.
Cylinder end too hot.
Hoops are broken from belled out
HP cylinder end.
Oil present in dynamic end of HP cylinder.
Leaky hydraulic rod seal.
Replace plunger bearing.
Replace HP seals and hoops and HP cylinder if necessary.
Replace HP seals and hoops and check valve body if necessary.
Replace.
Replace or repair.
Replace HP seals and hoops.
Rebuild center section.
No action required.
Inspect, repair and/or replace HP cylinder ID and plunger.
Start-up new seals carefully.
Check demand on pump.
Replace backup or bearing.
Correct problem. Refer to the High-Pressure Water section of
the manual.
Replace HP cylinder when necessary.
Replace rod seal.
68