MMD Equipment 400S-6B1 - Manual (Page 45)

6. Maintenance/Adjustment
6-3
6.2 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 motor
stopper.
(3) No fuel.
Disassemble, clean, and
change
Check fuse
Change motor stopper
Check connector
Replenish fuel
Discharge air
pressure does not reach
100psi (6.9bar).
(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 100psi (6.9bar).
(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) Low discharge pressure.
(3) Oil separator deteriorated.
Disassemble/Clean
Disassemble/pressure
Control valve/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