Bushing Series Service Manual
Testing Procedure
Do not test the unit above the working pressure of the destined application. This will minimize unnecessary
housing wipe and assure optimum volumetric output.
0-15 seconds @ 0 psi 136-150 seconds @ 2500 psi
16-30 seconds @ 500 psi 151-165 seconds @ 0 psi
31-45 seconds @ 0 psi 166-180 seconds @ 3000 psi
46-60 seconds @ 1000 psi 181-195 seconds @ 0 psi
61-75 seconds @ 0 psi 196-210 seconds @ 3500 psi
76-90 seconds @ 1500 psi 211-225 seconds @ 0 psi
91-105 seconds @ 0 psi 226-240 seconds @ 4000 psi
106-120 seconds @ 2000 psi 241-255 seconds @ 0 psi
121-135 seconds @ 0 psi 256-270 seconds @ 4500 psi
Startup and Break-in Procedure
1. Before you begin testing, unscrew the main relief
valve on the circuit.
2. Run the pump for two minutes under no load
conditions, low pressure, and low rpm (600
rpm minimum). If everything seems to function
properly and no unusual sounds are heard, you may
commence testing per the procedure below.
The testing for the Bushing Series units should be
followed closely to assure optimum performance.
When testing a multiple unit, test one section at a
time. Be sure the other sections are being supplied
with adequate oil during the test procedure.
The testing procedure involves loading and unloading
the unit to prevent contamination of the bushings and
bushing journals. In doing so, particles of contaminate
generated during the load cycle will be flushed through
the system during the no load cycle.
Fluid Type and Temperature Conditions
1. The Bushing Series pumps and motors are
compatible with mineral base, water glycol, and
invert emulsion fluids. Fluids such as phosphate
ester may be used in some applications. Please
consult the factory prior to using this type of fluid.
It is recommended that a premium quality hydraulic
fluid with a viscosity range of 150-300 SUS (32-65
cSt.) at 100°F (38°C) be used to assure optimum
performance. The normal operating viscosity range
is between 55-1000 SUS (9-220 cSt.) with a start
up viscosity not to exceed 2000 SUS (440 cSt.).
2. Under normal operating conditions, fluid
temperatures should not exceed 180°F (82°C)
for mineral base fluids and 135°F (57°C) for
water glycol and invert emulsions. If temperatures
greater than these values are required for a
particular application, please consult your Permco
representative or call the factory.
3. To assure maximum performance and life, a
10 micron return line filter with a Beta 10 rating
of 2.2 is required for the system. Testing and
operating a new or serviced unit without proper
filtration will lead to premature failure of the shaft
journals and journal bushings.
Procedures/Notes
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