Parker P1 Series - Page 7

Parker Hannin Corporation
Hydraulic Pump and
Power Systems Division
Marysville, Ohio USA
Bulletin HY28-2665-02/SVC/EN
Medium Pressure Axial Piston Pumps
P1/PD Maintenance
7
Trouble Shooting
Effect of Trouble Possible Cause Fault Which Needs Remedy
high wear in pump
excessive loads
reduce pressure settings
reduce speeds
contaminant particles
in uid
improper lter maintenance
lters too coarse
introduction of dirty uid to system
reservoir openings
improper reservoir breather
improper line replacement
improper uid
uid too thin or thick for operating temperature range
breakdown of uid with time/temperature/heating effects
incorrect additives in new uid
destruction of additive effectiveness with chemical aging
improper repair
incorrect parts
incorrect procedures, dimensions, nishes
unwanted water in uid
condensation
faulty breather/strainer
heat exchanger leakage
faulty clean-up practice
water in makeup uid
heating of uid
excessive pump leakage
recheck case drain ow and repair as required
uid too thin
improper assembly, port timing
relief valve
set too low (compared to load or to compensator)
instability caused by back pressure, worn parts
compensator
set too high (compared to relief)
worn parts
pump too large for
uid needs
select smaller pump displacement
heat exchanger
water turned off or too little ow
water too hot
fan clogged or restricted
efciency reduced by mud or scale deposits
intermittent hydraulic uid ow
reservoir
too little uid
improper bafes
insulating air blanket that prevents heat rejection
heat pickup from adjacent equipment