Troubleshooting Checklist
Trouble
Cause
Remedy
Oil Leakage
1. Hose fittings loose, worn or
Check & replace damaged
damaged.
fittings or "O" Rings. Torque
to manufacturers
specifications.
2. Oil seal rings (5) deteriorated by
Replace oil seal rings by
excess heat
disassembling MAF unit.
3. Special bolt (21 loose or its sealing
(a) Loosen then tighten single
area deteriorated by corrosion
bolt to 22-26 ft.-lbs.
(30-35 N m)
(b) Replace bolt.
4. Internal shaft seal (16) worn or
Replace seal by disassembling
damaged
MAF unit.
5. Worn coupling shaft (11 ) and
Replace coupling shaft and
internal seal (16)
seal by disassembling MAF
unit.
Significant loss of
1. Lack of sufficient oil supply
(a) Check for faulty- relief valve
speed under load
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 leakage
(a) Replace worn rotor set by
disassembling MAF unit.
3. Severely worn or damaged
Replace rotor set, drive link
internal splines
and coupling shaft by
disassembling MAF unit.
4. Excessive heat
Locate excessive heat source
in the system and correct the
condition.
Low mechanical
1. Line blockage
Locate blockage source and
efficiency or undue
repair or replace.
high pressure
required to operate
MAF unit
2. Internal interference
Disassemble MAF unit,
identify and remedy cause and
repair, replacing parts as
necessary.
3. Lack of pumping pressure
Check for and repair worn
pump.
4. Excessive binding or loading in
Locate source and eliminate
system
cause.
CAUTION: IF THE HYDRAULIC SYSTEM FLUID BECOMES OVERHEATED [IN EXCESS OF 200°F (93.30C.)], SEALS
IN THE SYSTEM CAN SHRINK, HARDEN OR CRACK, THUS LOSING THEIR SEALING ABILITY.
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