CAT Pump Maintenance

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In today’s Tom’s way, we show you how to service a Cat 310 Pump.

How to Service a Cat 310 Pump

Tools you will need: Socket Seal Case Tool (part# PU33004)
Reverse Pliers (part# PU30696)
M8 Allen Wrench Tool
Regular Screwdrivers
Socket Set & Pliers

Remove the hexbolts on each side
of the manifold.
Remove the hex Valve Plugs
(top discharge, bottom inlet)
Examine the O-Ring under the Valve Plug for cuts
or distortion and replace if worn. Lubricate the
new O-Rings before installing on the manifold.
Grasp Spring Retainer by tab at the top
with pliers and remove from
valve chamber.
Examine the Valve O-Ring for cuts or distortion
and replace if worn. Lubricate the new O-Rings
before installing on the manifold.
Separate Manifold Head from crankcase by
turning the shaft, insert 2 screwdrivers in
gap and pry Manifold Head forward until it
comes off.

Place Manifold Head on work surface
with crankcase side up. Remove Lo-pressure
Seal On 5PFR & 7PFR plunger pumps
prior to May 1989, remove Snap Ring &
Lo-Pressure Seal from each Seal Case.
Discard Snap Rings. On 5PFR & 7PFR
plunger pumps after May 1989, remove
Lo-Pressure Seal from each Seal Case.
Remove Seal Case from each
seal chamber. Remove O-Ring
from outside diameter of
Seal Case.

Hi-Pressure Seal is easily removed
from the manifold without any tools.
If extremely worn a reverse pliers
may be used.

Correct Seal arrangement

Examine Seal Case O-Ring and replace
if worn. Lubricate new O-Ring before
installing.

Lo-Pressure Seal must be installed with Garter
Spring side down. The down direction is
facing the front of the manifold.
Groove Side Down
Install Lo-Pressure Seal into each
seal case with Garter Spring down.
Remove oil pan and seal retainer with wick. Using an M12 hex tool on the pumps,
loosen the plunger retainer about three to
four turns.

Inspect O-Ring and Back-Up Ring for wear
& replace if needed. Examine Ceramic
Plunger for scoring, scale build-up,
chips or cracks and replace if needed.
Install new Gasket, then O-Ring, then
Back-Up onto each Plunger Retainer.
Rotate Crankshaft
by hand so the two
outside plungers are
extended equally.