Troubleshooting Checklist
Trouble
Cause
Remedy
Oil Leakage
1. Hose fittings loose, worn or damaged
Check & replace damaged-fittings
or "O" Rings. Torque to
manufacturers specifications.
2. Oil seal rings (7) deteriorated by
Replace oil seal rings by
excess heat
disassembling Torqmotor unit.
3. Special bolt (24) loose or its sealing
(a).Loosen then tighten single bolt to
area deteriorated by corrosion
45-55 ft.lbs. (60-76 N m)
(b) Replace bolt.
4. Internal shaft seal (5) worn or
Replace seal. Disassembly of
damaged
Torqmotor unit not necessary.
5. Worn coupling shaft (11) and internal
Replace coupling shaft and seal by
seal (5)
disassembling Torqmotor unit.
Significant loss of speed under
1. Lack of sufficient oil supply
(a) Check for faulty relief valve and
load
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 Torqmotor TM unit.
3. Severely worn or damaged internal
Replace rotor set, drive link and
splines
coupling shaft by disassembling
Torqmotor TM unit.
4. Excessive heat
Locate excessive heat source
(usually a restriction) in the
system and correct the condition.
Low mechanical efficiency or
1. Line blockage
Locate blockage source and repair
undue high pressure required to
or replace.
operate TorqmotorÔ unit
2. Internal interference
Disassemble Torqmotor TM 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 system
Locate source and eliminate
external to MAB/MAE unit.
cause.
CAUTION: If the hydraulic system fluid becomes overheated [in excess of 200°F (93.3 °C)], seals
in the system can shrink, harden or crack, thus losing their sealing ability.
Patents
Ross Gear Division products and systems described in this manual are protected by one or more of the following United
States patents: 3,289,602; 3,288,034; 3,452,680 and 3,606,601. In addition, patent applications have been filed in Brazil,
Canada, Denmark, France, Italy, Japan, Sweden, the United Kingdom, and West Germany.
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