Parker Hannifin Corp.
Hydraulic Pump/Motor Div.
Greeneville, TN 37745 USA
3
NOTE:
Before troubleshooting any system problem, check service literature published by
the equipment and/or component manufacturers. Follow their instructions, if given,
for checking any component other than the motor unit.
!
!
Troubleshooting Guide
Preliminary Checks
Hydraulic systems are often trouble free. Therefore
check the following easy to check items first, such as:
•
Parts damaged from impact that were not properly
repaired, or that should have been replaced.
•
Improper replacement parts used in previous
servicing.
•
Mechanical linkage problems such as binding,
broken parts or chain , loose parts, or slipping
belts.
Hydraulic Components
If the motor has low speed or torque, look at the check
list on the next page first. Since these motors main-
tain volumetric and torque efficiencies during their
useful life, the problem is usually elsewhere in the
hydraulic system.
However, there are hydraulic system problems which
can drastically reduce the long life designed into these
motors. Three key areas to check are:
•
Temperature: Do not exceed 180°F.
•
Fluid: Viscosity at the maximum temperature must
exceed 50 ssu.
•
Filtration: A Beta 25 ratio of at least 2.
Preparation
Make your troubleshooting easier by preparing as follows:
•
Work in a clean, well lighted area.
•
Have proper tools and materials nearby.
•
Have an adequate supply of clean petroleum - based
solvent.
•
Prior to any motor disassembly, plug the open ports
and case drain.
•
Clean all dirt from the outside of the motor.
•
Prior to assembly lightly oil all seals, rollers, rolls and
the threaded bolt ends.
WARNING:
Since solvents are flammable, be
extremely careful when using any
solvent, even a small explosion or
fire could cause injury or death.
WARNING:
Wear eye protection and comply
with OSHA and other maximum air
pressure requirements.
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