Troubleshooting Checklist - Parker Hydraulics TK Series Service Procedure

HY13-1518-M1/USA

Troubleshooting Checklist

Trouble
Oil Leakage
Significant loss of
speed under load
Low mechanical
efficiency or undue
high pressure
required to operate
Torqmotor unit
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.
Hydraulics
Cause
1. Hose fittings loose, worn or
damaged.
2.Oil seal rings (5) deteriorated by
excess heat.
3.Special bolt (1)
loose or its sealing area
deteriorated by corrosion.
4.Internal shaft seal (18) worn or
damaged.
5.Worn coupling shaft (14) and
internal seal (18).
1. Lack of sufficient oil supply
2.High internal motor leakage
3.Severely worn or damaged
internal splines.
4.Excessive heat.
1. Line blockage
2.Internal interference
3.Lack of pumping pressure
4.Excessive binding or loading in
system external to Torqmotor
unit.
Low Speed High Torque, Hydraulic Motors
TK Series
Remedy
Check & replace damaged
fittings or "O" Rings. Torque to
manufacturers specifications.
Replace oil seal rings by disassembling
Torqmotor unit.
(a) Loosen then tighten single bolt to
torque specification.
(b) Replace bolt.
Replace seal. Disassembly of Torqmotor unit
necessary.
Replace coupling shaft and seal by
disassembling Torqmotor unit.
(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.
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.
7
Parker Hannifin Corporation
Hydraulic Pump/Motor Division
Greeneville, TN 37745 USA