Troubleshooting - Bosch CET3-10 Operating/Safety Instructions Manual

This section provides a list of the more frequently encountered malfunctions, their causes and corrective ac-
tions. The operator or maintenance personnel can perform some corrective actions, and others may require
the assistance of a qualified Bosch technician or your dealer.
PROBLEM
Excessive air tank
pressure – safety
valve pops off
Air leaks
Air leaks in air tank or
at air tank welds
Air leaks between
head and valve plate
Air leaks from safety
valve
Knocking noise
Pressure reading on
the regulated pressure
gauge drops when an
accessory is used
14
trouble sHootInG
SYMPTOMS
• Pressure switch does not
shut of motor when com-
pressor reaches cut-out
pressure
• Pressure switch cut-out
too high
• Tube fittings are not tight
enough
• Defective air tank
• Leaking seals
• Defective safety valve
• Defective safety valve
• Pump oil is low
• Carbon build-up in pump
• Regulator is not adjusted
correctly for accessory
being used
RESOLUTION
• Set the On/Off switch to Off, if the unit
does not shut off contact a Bosch fac-
tory service center or a Bosch authorized
service center
• Contact a Bosch factory service center or
a Bosch authorized service center
• Tighten fittings where air can be heard
escaping. Check fittings with soapy water
solution. Do not overtighten.
• Air tank must be replaced. Do not repair
the leak
• Warning:
Risk of bursting. Do not drill
into, weld or otherwise modify air tank or
it will weaken. The air tank can rupture or
explode.
• Contact a Bosch factory service center or
a Bosch authorized service center
• Operate safety valve manually by pull-
ing on ring. If valve still leaks, it must be
replaced.
• Operate safety valve manually by pull-
ing on ring. If valve still leaks, it must be
replaced.
• Add no-detergent oil to pump.
• Contact a Bosch factory service center or
a Bosch authorized service center
• It is normal for some pressure drop to
occur when an accessory is used, adjust
the regulator.
• Note:
Adjust the regulated pressure
under flow conditions while accessory is
being used.