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Parker Hannifin Corporation | Pump & Motor Division | Kings Mountain, NC
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-PMD300-SM/US
PGP/PGM 300 Series
Gear Pumps & Motors Service Manual
Disassembly Instructions
CAUTION:
1. If prying off sections becomes necessary, take extreme care not to mar or damage machined surfaces. Excessive force
while prying can result in misalignment and seriously damage parts.
2. If parts are difcult to t during assembly, tap gently with a soft hammer. (Never use an iron hammer).
3. Gears are closely matched, therefore they must be kept together as sets, avoid touching gear journals when removed
from a unit. Handle with care to avoid damage to the journals or teeth.
4. Never hammer bushings into bores. Use an arbor press.
1) Place the pump in a vise with the drive shaft
pointing down (Fig. 1). Match-mark all sections.
Be sure to align these marks when reassembling.
DO NOT GRIP ON OR NEAR ANY MACHINED
SURFACES DURING ASSEMBLY OR
DISASSEMBLY.
Figure 1
2) Remove four bolts and cap screws on single units
or the 4 hex nuts, studs and washers of multiple
units (Fig. 2). Use an impact driver in a cross-
pattern. Inspect threads and cap screws for wear.
Figure 2
3) Lift off the port end cover and look at underside
for any damage (Fig. 3). If prying is necessary,
be careful not to damage the machined surfaces.
Dowel pins will remain in either the port end cover
or the gear housing. Make sure they are rmly in
place and not missing for reinstallation.
Figure 3
Start Disassembly
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