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WARNING: This product can expose you to chemicals including lead or DEHP which are known to the state of California to cause cancer,
birth defects, and other reproductive harm. www.p65warnings.ca.gov
Catalog HY13-PMD600-SM/US
PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Guidelines for Acceptable Wear
Gear Housing
Wear in excess of .005" cut-out necessitates replacement of the
gear housing body. Place a straight-edge across bore. If you can
slip a .005" feeler gauge under the straight-edge in the cut-out area,
replace the gear housing body.
Pressure pushes the gears against the housing on the low pressure
side. As the hubs and bushings wear, the cut-out becomes
more pronounced. Excessive cut-out in a short period of time
indicates excessive pressure or oil contamination. If the relief valve
settings are within prescribed limits, check for shock pressures or
tampering. When the cut-out is moderate, 005" or less, the gear
housing body is in good condition and may be reused.
Gears
Any scoring on gear hubs necessitates replacement. Scoring,
grooving, or burring of the outside diameter of the teeth requires
replacement. Nicking, grooving, or fretting of teeth surfaces also
necessitates replacement.
Drive Shafts
Replace if there is any wear detectable by touch in the seal area or
at the drive coupling. The maximum allowable wear is .002".
Wear in the shaft seal area indicates oil contamination. Wear or
damage to splines, keys, or keyways necessitates replacement.
Balance Plates
The balance plates seal the gear section at the sides of the gears.
Wear here will allow internal slippage, that is, oil will bypass within
the pump.
A maximum of .002" wear is allowable. Replace balance plates if
they are scored, eroded or pitted. Check center of thrust plates
where the gears mesh. Erosion here indicates oil contamination.
Pitted balance plates indicate cavitation or oil aeration. Discolored
balance plates indicate overheating, likely due to insufcient oil.
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