Table 4-1. Troubleshooting - continued
PROBLEM
POSSIBLE CAUSE
REMEDY
Frequent or pre-
1. Scored rods or sleeves.
Replace rods and sleeves.
mature failure of
the inlet manifold
2. Over pressure to inlet
Reduce inlet pressure per instructions.
seals.
manifold.
Short cup life
1. Damaged or worn
Replace cylinders.
chrome plating of
the cylinders.
2. Abrasive material in
Install proper filtration on pump inlet
the fluid being pumped.
plumbing.
3. Excessive pressure
Check pressures and fluid inlet temper-
and/or temperature
ature; be sure they are within speci-
of fluid being pumped.
fied range.
4. Over pressure of
Reduce pressure.
pumps.
5. Running pump dry.
Do not run pump without water.
6. Front edge of piston
Replace with new piston.
sharp.
7. Chrome plating of
Install new cups and cylinders. Pump
cylinders damaged
only fluid compatible with chrome.
causing excessive
wear of cups. May be
caused by pumping
acid solution.
Strong surging at
Foreign particles in the
Check for smooth lap surfaces on in-
the inlet and low
inlet or discharge valve
let and discharge valve seats. Dis-
pressure on the
or worn inlet and/or dis-
charge valve seats and inlet valve
discharge side
charge valves.
seats may be lapped on a very fine
oil stone; damaged cups and discharge
valves cannot be lapped but must be
replaced.
FORCE FEED LUBRICATOR
Feed rate too high
Feed regulator set too
Lower feed regulator setting.
high.
Feed rate too low
1. Feed regulator set
Raise feed regulator setting.
too low.
2. Clogged inlet strainer
Remove and clean inlet strainer
or inlet tube.
and tube.
4-9
