Service Manual
HY13-1512-006-M1/USA
Torqmotor™ Service Procedure
TC, TS, TB, TE, TJ, TF, TG, TH and TL Series
Parker Hannifi n Corporation
Hydraulic Pump/Motor Division
Greeneville, TN 37745 US
9
Troubleshooting Checklist
1. Hose fi ttings loose, worn or
damaged.
2. Oil seal rings (4) deteriorated by
excess heat.
3. Special bolt (1, 1A, 1B or 1C)
loose or its sealing area
deteriorated by corrosion.
4. Internal shaft seal (16) worn or
damaged.
5. Worn coupling shaft (12) and
internal seal (16).
Oil Leakage
Check & replace damaged
fi ttings or “O” Rings. Torque to
manufacturers specifi cations.
Replace oil seal rings by disassembling
Torqmotor™ unit.
(a) Loosen then tighten single bolt to
torque specifi cation.
(b) Replace bolt.
Replace seal. Disassembly of Torqmotor™
unit necessary.
Replace coupling shaft and seal by
disassembling Torqmotor™ unit.
Signifi cant loss of
speed under load
1. Lack of suffi cient oil supply
2. High internal motor leakage
3. Severely worn or damaged
internal splines.
4. Excessive heat.
(a) Check for faulty relief valve and
adjust or replace as required.
(b) Check for and repair worn pump.
(c) Check for and use correct oil for
temperature of operation.
Replace worn rotor set by disassembling
Torqmotor™ unit.
Replace rotor set, drive link and coupling
shaft by disassembling Torqmotor™ unit.
Locate excessive heat source (usually a
restriction) in the system and correct the
condition.
Low mechanical
effi ciency or un-
due high pressure
required to operate
Torqmotor™ unit
1. Line blockage
2. Internal interference
3. Lack of pumping pressure
4. Excessive binding or loading in
system external to Torqmotor™
unit.
Locate blockage source and repair or
replace.
Disassemble Torqmotor™ unit, identify and
remedy cause and repair, replacing parts
as necessary.
Check for and repair worn pump.
Locate source and eliminate cause.
CAUTION: If the hydraulic system fl uid becomes overheated [in excess of 200°F (93.3°C)], seals in the
system can shrink, harden or crack, thus losing their sealing ability.
Trouble Cause Remedy