Doosan HP450WJD T3, Operation & Maintenance Manual

Page: 120 / 130

Operating & Maintenance Manual Fault Finding
120 Book: 23252059 (08-2010) Rev B
Excessive vibration. Engine speed too low. See ”Engine speed too low”
Leaking oil seal. Improperly fitted oil seal. Replace the oil seal.
Refer also to the Engine Manufacturer’s Manual.
Air discharge
capacity too low. Engine speed too low. Check the air cylinder and air filter(s).
Blocked air cleaner.
Check the restriction indicators and replace
the element(s) if necessary.
High pressure air
escaping.
Check for leaks.
Incorrectly set regulation
system.
Reset the regulation system. Refer to
SPEED AND PRESSURE REGULATION
ADJUSTMENT
in the MAINTENANCE
section of this manual.
Compressor
overheats. Low oil level. Top up the oil level and check for leaks.
Dirty or blocked oil
cooler.
Clean the oil cooler fins.
Incorrect grade of oil. Use recommended oil.
Defective by-pass valve.
Check the operation of the element and
replace if necessary.
Recirculation of cooling
air.
Move the machine to avoid recirculation.
Reduced cooling air
from fan. Check the fan and the drive belts. Check for
any obstruction inside the fan cowl.
Excessive oil
present in the
discharge air.
Blocked scavenge line.
Check the scavenge line, drop tube and
orifice. Clean and replace.
Perforated separator
element.
Replace the separator element.
Pressure in the system
is too low.
Check the minimum pressure valve.
Safety valve
operates. Operating pressure too
high. Check the setting and operation of the
regulator valve piping.
Incorrect setting of the
regulator.
Adjust the regulator.
Faulty regulator. Replace the regulator.
FAULT CAUSE REMEDY