PGP/PGM 300 Series
Service Manual HY09-SM300/US
5
Parker Hannifin Corporation
Gear Pump Division
Youngstown, OH
Start Disassembly Here
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 difficult to fit 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 when removed from a unit. Handle with care to avoid
damage to the journals or teeth. Avoid touching gear journals.
4. Never hammer bushings into bores; use an arbor press.
1) Place the pump in a
vise with the drive shaft
pointIng down. Caution:
DO NOT GRIP ON OR
NEAR ANY MACHINED
SURFACES DURING
ASSEMBLY OR
DISASSEMBLY.
Match-mark all sections.
Be sure to align these
marks when
reassembling.
4) Remove the thrust
plate. Examine and
replace if necessary.
See wear guide page 10.
5) Carefully remove the
drive and driven gears.
Avoid tapping the gear teeth
together or against other
hardened surfaces. Keep
these gears together
because they are a matched
set. Examine and replace if
necessary. (See page 10).
Remove the thrust plate
from the bearing carrier.
Examine and replace if
necessary.
For multiple assemblies only
6) Lift the gear housing
from the bearing carrier.
If prying is necessary,
take care not to damage
machined surfaces.
Examine and replace
if necessary.
(See page 10)
For multiple assemblies
only
2) Use a socket wrench
to remove the 4 cap
screws on single units or
the 4 hex nuts, studs
and washers of multiple
units.
3) Lift off the port end
cover. 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.
