MMD Equipment 100S-6B4 - Manual (Page 54)

6. Maintenance/Adjustment
6-4
6.3 Troubleshooting
Should any trouble occur during operation, do not leave it. Investigate the cause and take
appropriate measures.
Read the manual carefully and fully understand what to do in case of trouble.
The better you understand the construction and function of the unit, the faster you can find a
problem and solution.
This chapter describes the state, cause and countermeasures of important troubles in detail:
Symptom Cause Countermeasures
Low starter
revolution speed.
(1) Battery malfunction. Check battery→
Charge, change
Starter rotates but
engine does not
start.
(1) Fuel filter clogging.
(2) Malfunction of fuel cut solenoid or
motor stopper.
(3) No fuel.
Disassemble, clean, and
change
Check fuse
Change solenoid or motor
stopper
Check connector
Replenish fuel
Discharge air
pressure does not
reach 100 psi (6.9
bar).
(1) Pressure regulator insufficient adjustment.
(2) Starting unloader valve is left at its
start position.
Re-adjust (Fasten)
Place it at “RUN” position
Engine does not
reach its
maximum speed.
(1) Improper length in speed regulator rod.
(2) Unloader orifice clogging.
(3) Faulty speed regulator.
(4) Engine trouble.
(5) Fuel filter clogging.
Re-adjust
Disassemble/Clean
Disassemble/Check
Call your nearest dealer
Disassemble/Change
Revolution drops
before discharge
air pressure
reaches 100 psi
(6.9 bar).
(1) Pressure regulator insufficient
adjustment.
(2) Trouble of pressure regulator.
(3) Unloader orifice clogging.
Re-adjust (Fasten)
Change
Disassemble/Check
Engine does not
reach minimum
revolution at
unload.
(1) Improper length in speed regulator rod.
(2) Faulty speed regulator.
Re-adjust
Disassemble/Check
Safety valve
relieves at unload. (1) Pressure regulator insufficient
adjustment.
(2) Speed regulator diaphragm damaged.
(3) Unloader valve damaged and seat
malfunction.
(4) Faulty safety valve.
(5) Improper length of speed regulator rod.
Re-adjust (loosen)
Change
Change
Change
Re-adjust (elongate)
Oil mixes in Air.
(Poor oil
separation)
(1) Scavenging orifice strainer clogging.
(2) Excessive oil in tank.
(3) Low discharge pressure.
(4) Oil separator deteriorated.
Disassemble/Clean
Drain to its proper level
Disassemble unloader/Check
Disassemble/Change
Insufficient free air
delivery. (1) Air filter element clogging.
(2) Unloader valve cannot fully open.
(3) Engine does not reach rated speed.
Clean element or change
Call your nearest dealer
See 6.1.