Eaton PVM045 - Testing; Start-up Procedure; Troubleshooting

EATON PVM Piston Pump Service Manual E-PUIO-II001-E4 December 201746
Start–up Procedure
Make sure the reservoir and circuit are clean and free of dirt/
debris prior to lling with hydraulic uid. Fill the reservoir with
ltered oil to a level sufcient to prevent vortexing at suc-
tion connection to pump inlet. It is good practice to clean the
system by ushing and ltering using an external slave pump.
Before starting the pump, ll with uid through one of the
ports. This is particularly important if the pump is above the
uid level of the reservoir. When initially starting the pump,
remove all trapped air from the system. This can be accom-
plished by loosening the pump outlet ttings or connections
before starting the pump or by using an air bleed valve. All
inlet connections must be tight to prevent air leaks. Once the
pump is started it should prime within a few seconds. If the
pump does not prime, check to make sure that there are no
restrictions between the reservoir and the inlet to the pump,
and there are no air leaks in the inlet line and connections.
Also check to make sure that trapped air can escape at the
pump outlet. After the pump is primed, tighten the loose
outlet connections, and then operate for ve to ten minutes
(unloaded) to remove all trapped air from the circuit. If reser-
voir has a sight gauge, make sure the uid is clear – not milky.
Add uid to the reservoir up to the proper ll level. Perform
functional test on pump according to Eaton test procedure.
Contact your area sales manager for more information.
Troubleshooting
The troubleshooting chart below lists common difculties
experienced with pumps and hydraulic systems. The chart
indicates probable causes and remedies for each of the
troubles listed.
Testing
Trouble Probable Cause Remedy
Excessive noise in pump low oil level in reservoir ll reservoir to pepper level with recommended uid. DO NOT overll or
damage may result.
Air in the system 1. Open reservoir cap and operate hydraulic system until purged.
2. “Bleed“ hydraulic lines at point downstream of the pump while the
system is under pressure.
Vacuum condition Check inlet (suction) lines and ttings for leaks.
Oil tool thick Be certain correct type of oil is for relling or adding to the system.
Cold weather Run hydraulic system until unite is warm to the touch and noise disappears.
Hydraulic pump over heating Internal leakage If established that excessive internal leakage exist within the pump, return to
maintenance shop for evaluation and repair.
Heat exchanger not functioning Locate trouble and repair or replace.
Fluid level low Add oil to proper operating level.
System not developing pressure Compensator malfunction Replace or repair.
Loss of uid internally (slippage) Return to maintenance shop for evaluation and repair.
Loss of uid Ruptured hydraulic line 1. Check all external connections, tubing and hoses.
2. Tighten connections, replace ruptured tube or hose.
Leaking gaskets or seals in the Observe mating section of pump for leaks. Replace seals of gaskets in
system possible. Check all system components for leaks.
Miscellaneous Broken or mis-adjusted Adjust or replace pump control.
pump control
Disconnected or broken drive Locate and repair.
mechanism