Bearing and Spacer Inspection:
It is difficult to visually determine the condition of a bearing. If there is obvious damage such as
discoloration (bluing) of the bearing or the race, there is definite damage and the bearing and
spacer should be replaced. If there is no discoloration and minimal amounts of carbon or oil sludge
build-up on the bearing cage, it can probably be cleaned in solvent, blown out with an air hose, oiled
and reused.
Note: There is no guarantee that the bearings are not damaged and with the pump
disassembled to this point, it is advisable to replace them.
The outer circumference of the spacer should be inspected for signs of contact with the bore of the
end cover bearing housing. If there has been contact, it could be a sign that the bearing is worn and
needs to be replaced.
Bearing and Spacer Removal:
Before removing the bearing and spacer any burrs on the shaft should be removed with a flat file.
For HXL Series pumps, loosen the set screw in the worm gear for the oil pump drive and remove the
worm gear from the shaft.
Once the shaft is free of burrs, the bearing and spacer can be pulled by means of a bearing puller.
Bearings should be removed only using the proper tools. A bearing puller is the only tool that will
give satisfactory results. Prying or hammering will only risk damage to the components.
Note: The spacers are not reusable and must be replaced when removed.
Do not install new bearings and Spacers at this time. Follow the Rotor Inspection and Cleaning
instructions first.
Rotor Inspection and Cleaning:
Inspect the rotor carefully for any cracks - especially if disassembly was due to pump seizure. Any
cracks in the rotor will require replacement of the part.
With the bearings and spacers removed, lightly file with a flat file along all edges of the vane slots to
remove any burrs or nicks that may have occurred from either contact or from foreign material.
Once all the burrs are removed, the ends and diameter of the rotor should be gone over lightly with
400 grit wet/dry sandpaper to remove any carbon or varnish deposits left by the oil.
Bearing and Spacer Replacement:
Place the new spacer on the shaft. Ensure that the spacer is installed on the rotor shaft with the
larger bore diameter facing towards the rotor.
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