GMC 40L Instruction Manual page 13

Problem
Insufficient pressure or decreased
outlet capacity
Troubleshooting continued
Possible Cause
Motor running too slow
Dirty air filter cartridge
Leaking safety valve
Leaking pipe
Damaged gasket
Damaged or carbon coated valve seat
Damaged piston ring or cylinder
Open drain cock
Air fittings leaking
13
Suggested Remedy
Use authorised service centre to check
and repair if necessary
Clean or replace the filter cartridge
Use authorised service centre to repair
or replace the switch
Use authorised service centre to check
and repair if necessary
Use authorised service centre to check
and repair if necessary
Use authorised service centre to check
and repair if necessary
Use authorised service centre to check
and repair if necessary
Check the drain cock, make sure it is
closed. If not immediately switch off the
unit as per the shut down instructions
and close the drain cock.
Check all air fittings. Make sure that
they are tight and not leaking at the
joins. If a quick release fitting is leaking,
disconnect it and reconnect it. If it
continues to leak replace the defective
fitting(s). If a male or female fitting is
leaking around the thread tighten using
a spanner. If the fitting is already tight
and can't be tightened, unscrew the
connection and remove the Teflon tape.
Examine the condition of the fitting(s).
If the a fitting(s) is damaged replace
and reassemble using Teflon tape on
threaded fittings. If the fittings are OK
reapply Teflon tape and reassemble.