If the oil pump was removed, reinstall the drive assembly. Align the hole in the drive assembly with
the oil inlet elbow and push the assembly in until it bottoms out. Engage the drive of the oil pump
with the slot in the drive assembly and reinstall the oil pump. Prime the oil lines and reconnect the
lines from the oil pump to the inlet fittings.
Reinstall the shaft cover and rotate the pump shaft by hand. If all is correct the rotor should turn
freely at this point and the pump can be reinstalled on the system.
Note: If all is correct, you should be able to hear each vane drop and contact the cylinder
as the rotor turns.
If the rotor does not turn freely, either one of the vanes is in crooked and caught on a bearing
spacer or the rotor is jammed against one of the covers due to a bearing sticking in the housing.
Before disassembling, strike the end of the rotor shaft with a rubber mallet and check for free
rotation. It is possible for a bearing to become slightly stuck in the bore, or the rotor is tight against
an end cover and will not turn due to lack of lubrication. If this does not cure the problem,
disassemble the pump following the procedure for End Cover Removal detailed above.
Note: Be sure to lubricate the pump before initial start-up to prevent damage in the first
few seconds of operation. Pour oil into the intake of the pump valve or into the cylinder
oiling fittings and rotate by hand to distribute, and if fitted bleed the oil pump.
Before refitting the pump to the vacuum truck it is recommended that all of the system filters and
traps are thoroughly cleaned and dried before the vacuum pump is operated.
Rebuild Specifications:
Cylinder Remachining:
If the cylinder scoring is deeper than .005" or if corrugation can be felt the cylinder should be bored,
honed and the seal gap reset. In reboring the cylinder the aim is to remove the minimum level of
material to achieve the original manufactured finish. Therefore the cylinder should only be machined
down to the deepest scoring/corrugation.
Note: If the scoring/corrugation is deeper than the maximum remachining boring depth
then the cylinder or pump will need to be replaced.
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