Pumps
GENERAL INSTRUCTIONS
In the event of pump failure, we strongly recommend that you contact your local distributor.
However, should you decide to facilitate the repair of these units - CONSULT THE
MANUFACTURER’S REPAIR MANUAL - read all of the steps used in disassembly and all of
the steps used in building up the unit. It is important to airblast all parts and wipe them with
a clean, lintless cloth before assembly.
Dirt is the enemy of any hydraulic system. The first requirement of good maintenance of
hydraulic equipment is cleanliness. MAKE SURE YOU DISASSEMBLE AND ASSEMBLE
YOUR HYDRAULIC EQUIPMENT IN A CLEAN AREA.
USE CAUTION IN GRIPPING ALL PARTS IN THE VISE TO AVOID DAMAGING MACHINED
SURFACES.
A pump must be driven in the direction of rotation for which it was built; otherwise,
pressure will blow the shaft seal. Check the plug positions below for proper direction of
rotation.
For P330 only - plug 5 required in position A and position B.
For P365: Plug in position B gives clockwise rotation. Plug in position A gives counter-
clockwise rotation.
START-UP PROCEDURE
Before installing a new or rebuilt pump or motor, back off the main relief valve until the
spring tension on the adjusting screw is relieved. This will avoid the possibility of immediate
damage to the replacement unit in the event that the relief valve setting had been increased
beyond the recommended operating pressure prior to removing the old unit.
Before connecting any lines to the pump or motor, fill all ports with clean oil to provide
internal lubrication. This is particularly important where the unit is located above the oil
reservoir.
After connecting the lines and mounting the replacement unit, operate the pump or motor
at least two minutes at zero pressure at lowest R.P.M. During this break-in period, the unit
should run free and not develop an excessive amount of heat. If the unit operates properly,
speed and pressure can then be increased to normal operating settings.
Reset the main relief valve to its proper setting while the pump is running at maximum
operating engine (motor) speed for the vehicle.
TEST PROCEDURE
Be sure there is an adequate supply of oil for the pump, at least one gallon of oil for each
GPM of pump capacity.
If one section of a tandem pump is being tested, make sure that all other sections not
being tested are adequately supplied with oil. If any of the other sections run dry, or if plugs
are left in ports, serious and permanent damage will result.
T300-1_T500-1_T780
Service / Parts
476 P/N 12261-683
REVISED: January 2015
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