Table 4-1. Troubleshooting - continued
PROBLEM
POSSIBLE CAUSE
REMEDY
Oil leakage -
4. Internal shaft seal
Replace seal.
continued
worn or damaged.
5. Worn coupling shaft
Replace coupling shaft and seal.
and internal seal.
Significant loss of
1. Lack of sufficient oil
(a) Check for faulty relief valve
speed under load
supply.
and adjust or replace as
required.
(b) Check for and repair worn
pump.
(c) Check for and use correct oil
for temperature of operation.
2. High internal motor
Replace worn rotor set.
leakage.
3. Severely worn or dam-
Replace rotor set, drive link and
aged internal splines.
coupling shaft.
4. Excessive heat.
Locate excessive heat source in the
system and correct the condition.
5. Loose V-belt.
Tighten V-belt or replace.
Low mechanical
1. Line blockage
Locate blockage source and repair
efficiency or undue
or replace.
high pressure re-
quired to operate
2. Internal interference.
Disassemble unit, identify and reme-
motor
dy cause and repair, replacing parts
as necessary.
3. Lack of pumping
Check for and repair worn pump.
pressure.
4. Excessive binding or
Locate source and eliminate cause.
loading in system.
Pulsation
1. Belt slippage.
Tighten or replace, use correct belt.
2. Air leak in inlet plumb-
Disassemble, reseal, and reassemble.
ing.
4-6
