9
Start the pump by ”jogging” the drive motor a few times to be
sure the pump is primed.
If the pump is new or has been overhauled, be certain it is prop-
erly installed. Check the direction of shaft rotation and align-
ment of the shaft with the drive motor. Since it is difficult to
achieve perfect shaft alignment, a flexible coupling must be
used.
Exercise care with pumps driven by belts, chain drives, spur
gears, etc. to prevent excessive side loading of the drive shaft.
Consult your Vickers’ representative for recommendations on
these type drives.
Pump life will be shortened by operation beyond maximum
pressure and speed ratings. Since these units are positive
displacement, a relief valve must be used to limit maximum
system pressure to recommended limits.
Section VI – Troubleshooting
TROUBLE
PROBABLE CAUSE
REMEDY
Pump not delivering fluid
Pump driven in wrong direction of rotation
Pump drive shaft broken or shaft key
sheared (direct drive)
Fluid intake pipe in reservoir blocked or oil
viscosity too heavy to pick up prime
Viscosity should not exceed 4000 S.S.U.
Air leaks at intake
Pump not priming
Oil level too low
Vane or vanes stuck in rotor slots
Must be reversed immediately to prevent
seizure. Check direction of drive rotation
against proper pump rotation as indicated by
arrow on body.
Remove pump from accessory mounting
pad and determine damage to pump car-
tridge. Replace needed parts.
Drain complete system. Add new fluid of
proper viscosity. Filter the new fluid as rec-
ommended. Check all filters for dirt and
sludge.
Check intake connection for air leak. Tighten
securely.
Loosen connection in outlet line. Bleed-off
air until fluid flows.
The fluid level must be above intake opening
in intake pipe. Check minimum drive speed
which may be too slow to prime the pumps.
Inspect rotor slots for wedged chips or for-
eign particles and replace all damaged
parts. Flush complete system thoroughly by
recommended processes and fill system
with new, clean hydraulic fluid.
Pump making noise
Partially clogged intake strainer or
restricted intake pipe
Defective bearing
Air leak at pump intake piping joints or
pump shaft seal
Coupling misalignment
Pump must receive intake fluid freely or
cavitation will result. Drain system, clean
intake pipe, and clean or replace strainer.
Add new fluid and strain by recommended
procedures.
Disassemble pump and replace bearing.
Test by pouring oil on joints and around
drive shaft. Listen for change in operation.
Tighten joints affected. Check pump shaft
oil seal for leakage and replace if neces-
sary, in accordance with instructions out-
lined in this manual. Check shaft for scor-
ing at seal contact area and replace shaft if
grooving is evident.
Check shaft bearing and seal for possible
damage. Replace if necessary. Re-align
shafts.
Table 1. Troubleshooting Chart
