Parker Hannifin Corporation
Gear Pump Division
Kings Mountain, North Carolina USA
16
Recommended Start-up
Procedure For New or
Rebuilt Pump
Before installing a new or rebuilt pump, 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, fill all ports
with clean oil to provide initial lubrication. This is par-
ticularly important if the unit is located above the
oil reservoir.
After connecting the lines and mounting the
replacement unit, operate the pump at least two min-
utes at no load and at low rpm (400 min.) During this
break-in period, the unit should run free and not de-
velop 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.
ALWAYS USE AN ACCURATE GAUGE
WHEN ADJUSTING THE RELIEF VALVE
PRESSURE SETTING.
Catalog HY09-SM500/US
Start-up Procedure
PGP/PGM500 Series
Service Manual
