Granit BM Manuel D'utilisation page 4

6. Maintenance
1) completely cut power supply and release all air inside the tank before maintenance work.
2) clean the crankcase and renew lubricating oil after the first 10 working hours.
3) check the oil level after every 20 working hours. refill if necessary.
4) open drain underneath the tank in order to undo it from condensation every 60 working hours.
5) clean crankcase and air filter and renew oil every 3 months.
6) The safety valve and pressure gauge should be checked by an expert every 6 months.
7) make sure the air tank is not damaged or rusty.
8) every year the thickness of the air tank wall should be checked by an expert in order to make sure it is not thinner than 2.1 mm.
7. Trouble shooting
Fault
motor cannot be started,
is running too slow or is
getting too hot
sticking of main compressor
strong vibrations or
abnormal noise
insufficient pressure or
decreased discharge capacity
excessive oil consumption
Probable cause
1) insufficient voltage, fault in circuit
2) power cable to thin or too long
3) Fault in pressure switch
4) motor malfunction
5) sticking of main compressor
1) moving parts are burnt due to a lack of oil
2) moving parts damaged or stuck by foreign object
1) connecting part loosened
2) Foreign object got stuck in main compressor
3) piston knocking on valve seat
4) other moving parts seriously damaged
1) motor running too slow
2) Air filter choked up
3) Leakage of safety valve
4) Leakage of discharge pipe
5) sealing gasket damaged
6) Valve plate damaged, carbon build-up
7) piston ring and cylinder worn or damaged
1) oil level too high
2) Breath pipe choked up
3) piston ring and cylinder worn or damaged
Remedy
1) check electrical circuit
2) replace wire
3) repair or replace switch
4) repair or replace motor
5) check and repair
check crankshaft, bearing, connecting
rod, piston, piston ring etc. and replace
if necessary.
1) check and retighten loosened part
2) check and remove part
3) replace with thicker paper gasket
4) repair and replace
1) check and repair
2) clean or replace the cartridge
3) check and adjust valve
4) check and repair
5) check and replace
6) replace and clean
7) repair or replace
1) Keep level within marked range
2) check and clean
3) repair or replace