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5.0 Troubleshooting (continued)
Problem
Unit lacks sufficient vacuum or
lag alarm has occurred (if ena-
bled) - Continued
High vacuum level
Motor breakers trip constantly
Unit runs rough and cannot be
rotated manually
Excessive noise level
Lubricated Rotary Vane Laboratory Vacuum Systems
Possible Causes
Exhaust valve not properly seated or
stuck open
Shaft seal is leaking
Radial clearance between rotor and
cylinder needs adjustment
Internal parts are damaged or worn
Vacuum relief valves need adjusting
Vacuum setting out of adjustment
Defective motor
Overload
incorrectly
defective
Low motor voltage
Stuck rotor
Clogged exhaust oil separator(s) - back
pressure too high
Ambient temperature too high
Worn coupling disc
Broken rotor vane
Locked rotor
Seized or worn bearings
Worn coupling rubbers
Worn bearings
Internal pump damage
Solution
Contact the factory for assistance. Have pump
model and serial number available.
Contact factory for assistance.
Adjust vacuum setting on main display.
Test motor and replace if necessary.
adjusted
or
Adjust or replace if necessary.
Check at motor terminals.
Contact electric service provider.
Disassemble pump to determine reason.
Replace all necessary parts.
Replace separator(s).
Reduce ambient temperature.
Remove motor and inspect rubber coupling
disc and pins. Replace, if necessary, and
realign.
Disassemble unit and replace vane.
Check cylinder for wear.
Remove end shields and inspect cylinder.
Remove contamination.
Remove end shields and inspect cylinder.
Replace if necessary. Re-shim bearings to
maintain proper clearance.
See "Worn coupling disc" above or call the
factory for replacement.
See "seized or worn bearings" above or call the
factory for replacement.
Contact factory for assistance.
5-2
4107 9021 88.01
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