TABLE IV - TROUBLE SHOOTING CHART
TROUBLE
PROBABLE CAUSE
REMEDY
PUMP NOT DELIVERING
DRIVEN IN THE WRONG DIRECTION
The drive direction must be changed
FLUID
OF ROTATION
immediately to prevent seizure. Figure 9
shows the correct ring position for each
direction of rotation.
COUPLING OR SHAFT SHEARED OR
Disassemble the pump and check the shaft
DISENGAGED
and cartridge for damage. (See Section
VI.) Replace the necessary parts.
FLUID INTAKE PIPE IN RESERVOIR
Check all strainers and filters for dirt and
RESTRICTED
sludge. Clean if necessary.
FLUID VISCOSITY TOO HEAVY TO PICK
Completely drain the system. Add new
UP PRIME
filtered fluid of the proper viscosity.
AIR LEAKS AT THE INTAKE PUMP NOT
Check the inlet connections to determine
PRIMING
where air is 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.
RELIEF VALVE STUCK OPEN (MODELS
Disassemble the pump and wash the valve
WITH INTEGRAL RELIEF VALVE ONLY).
in clean solvent. Return the valve to its
bore and check for any stickiness. A
gritty feeling on the valve periphery can be
polished with crocus cloth. Do not remove
excess material, round off the edges of the
lands or attempt to polish the bore. Wash
all parts and reassemble the pump.
VANE(S) STUCK IN THE ROTOR
Disassemble the pump. Check for dirt or
SLOT(S)
metal chips. Clean the parts thoroughly
and replace any damaged pieces. If
necessary flush the system and refill it with
clean fluid.
INSUFFICIENT PRESSURE
SYSTEM RELIEF VALVE SET TOO LOW
Use a pressure gauge to correctly adjust
BUILD-UP
the relief valve.
WORN PARTS CAUSING INTERNAL
Replace pump cartridge.
LEAKAGE OF PUMP DELIVERY -
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.
Check the inlet connections and seal to
AIR LEAKS AT THE INTAKE OR SHAFT
determine where air is being drawn in.
SEAL. (OIL IN RESERVOIR WOULD
Tighten any loose connections and
PROBABLY BE FOAMY)
replace the seal if necessary. See that the
fluid in the reservoir is above the intake
pipe opening.
PUMP DRIVE SPEED TOO SLOW OR
Operate the pump at the recommended
TOO FAST
speed.
COUPLING MISALIGNMENT
Check if the shaft seal bearing or other
parts have been damaged. Replace any
damaged parts. Realign the coupled
shafts.
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