Doosan HP450/VHP400WCU-T4i, Operation And Maintenance Manual

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Operation & Maintenance Manual Troubleshooting
84
Complaint Cause Correction
9. Low air delivery / low cfm Clogged air filter element(s). Clean or replace air filter element(s).
Incorrect pressure regulation
adjustment. Make adjustments per this manual.
Malfunctioning inlet unloader / butterfly
valve
Inspect valve. Make adjustments per
this manual.
Wrong air filter element(s). Install correct air filter element(s).
Low engine speed See Complaint #7. See Engine
manual.
Compressed air leaks. Locate and repair leaks.
10. Short air filter life
Dirty operating conditions. Move compressor to cleaner
environment.
Wrong air filter element(s). Install correct air filter element(s).
Inadequate air filter element cleaning. Install new air filter element(s).
Incorrect stopping procedure. Comply with procedure in this manual.
11. Compressor will not
unload Malfunctioning inlet unloader / butterfly
valve.
Inspect valve. Make adjustments per
this manual.
Malfunctioning pressure regulator. Check pressure regulator.
Check regulation lines for leaks.
Ice in regulation lines and/or regulation
orifice. Apply heat to lines and/or orifice.
Check operation of DC electric heaters,
if equipped.
L
Plugged vent leak. Clean and/or replace.
12. Safety valve opens Operating pressure too high. Reduce pressure to rated operating
pressure.
Malfunctioning inlet unloader / butterfl Inspect valve. Make adjustments per g y
valve.
p j p
this manual.
Defective safety valve. Replace safety valve.
Compressor will not unload fast
enough. Check pressure regulator.
Check regulation lines for leaks.
Ice in regulation lines and/or regulation
orifice. Apply heat to lines and/or orifice.
Check operation of DC electric heaters,
if equipped.
13. Excessive carryover
(compressor oil in the
compressed air) Blocked separator scavenge line. Check scavenge line, drop tube, and
orifice. Clean and replace as needed.
Deteriorated separator element. Replace separator element.
Separator tank pressure too low. Check the minimum pressure valve.
Repair or replace as necessary.
Diagnostic Codes
The MidPort displays diagnostic codes for the compressor system and the engine. Listin
of these codes are provided in this section.
The engine diagnostic codes can also be read with the engine manufacturer's service to
service tool connector is provided in the electrical harness, providing access to the J193
network. For advanced engine troubleshooting, it is recommended that the manufacture
service tools and service literature be used.