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BA-
45.01.0 • US •01/15
6-4
6. Operation
Procedure if faults occur
Gardner
Denver
rotary
compressors
and
compressor/vacuum pumps of the RFW series are
characterized by the fact that the rotor vanes work with
practically no wear under normal operating conditions.
If however any malfunctions should occur, the
following overview gives you the possibility to find the
cause and to solve the problem.
Possible cause
Elimination
Volume flow performance of
compressor/vacuum pump deteriorates
Vacuum filter contaminated
Leaking suction pipe
Leaking fittings
Rotation speed too low
Premature wear to vane; perhaps
contamination (water, dirt etc.)
has enter the machine (e.g. by
excess suction).
Clean filter, if necessary replace filter
element
Find and seal leaks
Replace fittings
Adhere to rotation range
Replace rotor vanes or have machine
overhauled in authorized repair workshop
Abnormal noise level
Machine poorly balanced
.
Bearing worn out
Too little lubrication oil
Unsuitable lubrication oil
Rotor vanes knock due to lateral
wear
Housing bore has grooves or
undulations due to dirt intake
Incorrect rotation speed
Altered pressure
Altered vacuum
Balance machine exactly
Have bearing replaced
Refill with oil; clean oil reservoir and
suction filter
Fill out oil in accordance with
lubrication oil table
Replace rotor vanes
Have housing re-bored and honed in
authorized repair workshop. If intake air is
strongly contaminated, fit a fine filter
Adhere to rotation speed limitations
Adhere to nominal pressure
Adhere to nominal vacuum
Compressed air temperature too high
Discharge pressure too high
Exhaust silencer blocked
Four-way tap in wrong position
.
Poor cooling
Valve plate in non-return valve
jammed
Vacuum filter blocked
Vacuum too low/counter-pressure
too high
Adhere to nominal pressure
Replace exhaust silencer
Turn four-way tap to correct position
Add cooling water, clean cooler and
cooling water chamber
Clean non-return valve
Clean filter
Adhere to nominal vacuum / check
exhaust gas system, clean if necessary
Operating pressure / vacuum is not reached
Manometer or vacuum meter
gives incorrect reading
Drive belts slips
Four-way tap in wrong position
Condensate draining tap open
Replace manometer or vacuum meter
Check belt tension, tighten if necessary
Turn four-way tap to correct position
Close condensate draining tap