Doosan HP450/VHP400WCU-T4i, Operation And Maintenance Manual

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Operation & Maintenance Manual Troubleshooting
82
Complaint Cause Correction
(continued)
2. Compressor won't start or
run Defective sensor. Identify and check sensor. Replace if
necessary. See Electronic Service
Manual.
Malfunctioning relay. Identify and check relay. Replace if
necessary. See Electronic Service
Manual.
Engine malfunctioning. See troubleshooting in Engine manual.
Airend malfunctioning. See Complaint #6.
3. High engine Coolant
Temperature
Low coolant level. Check coolant level. If low, add
coolant.
Loose or broken belts. Tighten or replace belt set.
Ambient temperature above rated
ambient temperature range. Operate in cooler environment.
Dirty operating conditions. Move compressor to cleaner
environment.
Dirty cooler(s). Clean exterior of cooler(s).
Compressor tilted beyond out-of-level
operating limit. Reposition or relocate compressor to
be more level.
Operating pressure too high. Reduce pressure to rated operating
pressure.
Recirculation of cooling air. Close enclosure doors. Close and
secure access panels. Check for loose
or missing belly pans.
Loose wire connection. Check wires at switches and
connectors to find loose connection.
Make repairs. See Electronic Service
Manual.
4. Low Engine Oil Pressure
Low engine oil level. Check oil level. If low, add oil.
4. Low Engine Oil Pressure
o e g e o e e C ec o e e o , add o
Compressor tilted beyond out-of-level
operating limit. Reposition or relocate compressor to
be more level.
Wrong engine oil. Change engine oil. Review engine oil
specification.
Clogged engine oil filter. Replace engine oil filter.
Engine malfunctioning. See troubleshooting in Engine manual.
Loose wire connection. Check wires at switches and
connectors to find loose connection.
Make repairs. See Electronic Service
Manual.
5. Low electrical system
voltage
Loose or broken belts. Tighten or replace belt set.
Loose wire connection. Check wires at switches and
connectors to find loose connection.
Make repairs. See Electronic Service
Manual.
Low battery voltage. Check battery condition; recharge if
necessary. Check electrolyte level; add
if necessary. Check cable connections;
clean and tighten as needed.
Malfunctioning alternator. Repair or replace alternator.