14
EATON Vickers
Single, Double, Triple and Thru-drive Pumps Overhaul Service Manual V-PUVN-TS001-E October 2002
Section V —
Inspection and
Maintenance
(cont.)
TROUBLE
PROBABLE CAUSE
REMEDY
Pump not delivering fluid.
Driven in the wrong direction of rotation.
The drive direction must be changed immediately to
prevent seizure. Refer to Section VI.C. for the correct
ring position for each direction of rotation.
Coupling or shaft sheared or disengaged.
Disassemble the pump and check the shaft and
cartridge for damage. (See Section VI) Replace the
necessary parts.
Fluid intake pipe in reservoir restricted.
Check all strainers and filters for dirt and sludge.
Clean if necessary.
Fluid viscosity too heavy to pick up prime.
Completely drain the system. Add new filtered fluid of
the proper viscosity.
Air leaks at the intake. Pump not
Check the inlet connections to determine where air is
priming.
being drawn in.Tighten any loose connections. See that
the fluid in the reservoir is above the intake pipe
opening. Check the minimum drive speed which may
be too slow to prime the pump.
Vane(s) stuck in the rotor slots(s).
Disassemble the pump. Check for dirt or metal chips.
Clean the parts thoroughly and replace any damaged
pieces. If necessary, flush the system and refill it with
clean fluid.
Insufficient pressure build-up.
System relief valve set too low.
Use a pressure gage to correctly adjust the valve.
Pump making noise.
Pump intake partially blocked.
Service the intake strainers. Check the fluid condition
and, if necessary, drain and flush the system. Refill
with clean fluid.
Air leaks at the intake or shaft seal.
Check the inlet connections and seal to determine
(Oil in reservoir would probably be foamy.)
where air is being drawn in.tighten any loose
connections and replace the seal if necessary. See
that the fluid in the reservoir is above the intake pipe
opening.
Pump drive speed too slow or too fast.
Operate the pump at the recommended speed.
Coupling misalignment.
Check if the shaft seal bearing or other parts have
been damaged. Replace any damaged parts. Realign
the coupled shafts.
Table 4.
Troubleshooting Chart
