PFT Air Compressor LK
402 IV
Overview – Operation – Spare
Parts Lists
Page 30
28.01.2019
7 Solution
Malfunction
Cause
Correction
Pressure drop in the tank.
Air outlet from the
connections.
Bring compressor to maximum pressure,
switch off power
and brush all connections with
a brush soaked in soapy water. The air outlets
become visible through air bubbles. Firmly tighten
the relevant connections (Fig. 19). If air outlet
persists, request service.
Air outlet from the pressure
switch valve when the
compressor is at a standstill.
Non-return valve
leaking.
Drain the air from the tank, remove the non-return
valve plug and thoroughly clean the valve seat.
If necessary, replace sealing element D
and reinstall everything (Fig. 18).
Air outlet from the pressure
switch valve when the
compressor is running for
more than 1 minute.
Break of the idle valve.
Replace the valve (Fig. 20).
Fig. 19: Air outlet
Fig. 20: Valve
The compressor switches off
and does not restart.
Motor protection
tripping due to motor
overheating.
Switch off the power supply via the pressure
switch and press the restart button (Fig.8).
If the motor protection should respond again
when the motor is restarted, qualified personnel
must be consulted.
The compressor switches off
and does not restart.
Winding blown.
Call in qualified personnel.
The compressor does not
switch off when the maximum
pressure is reached; the
safety valve responds.
Malfunction or
breakage of the
pressure switch.
Call in qualified personnel.
The compressor does not
charge and heats up
excessively.
Breakage of the head
gasket or a valve.
Switch off the compressor immediately and call in
qualified personnel.
The compressor runs very
loudly and with rhythmic,
metallic beats.
Eating the bronze
bearing or the bush.
Switch off the compressor immediately and call in
qualified personnel.
Summary of Contents for LK 402 IV
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