Komatsu WA800-3E0 Series Operation & Maintenance Manual page 220

TROUBLESHOOTING
ENGINE
q (
): Always contact your Komatsu distributor when dealing with these items.
q In cases of problems or causes which are not listed below, contact your Komatsu distributor for repairs.
Problem
Engine oil pressure caution pilot
lamp lights up
Steam is emitted from top part of
radiator (pressure valve)
Coolant temperature pilot lmap
lights up
Engine does not start when start-
ing motor is turned
Exhaust gas is white or blue
Exhaust gas occasionally turns
black
Combustion noise occasionally
makes breathing sound
Abnormal noise generated
(combustion or mechanical)
3-158
Main causes
•Engine oil pan oil level is low (sucking
in air)
•Clogged oil filter cartridge
•Defective tightening of oil pipe or
pipe joint, oil leakage from
damaged part
•Defective pilot lamp
•Lack of cooling water
•Loosen fan belt
•Dirt or scale accumulated in
cooling system
•Clogged radiator fin or damaged
fin
•Defective thermostat
•Loose radiator filler cap (high
altitude operation)
•Defective pilot lamp
•Lack of fuel
•Air in fuel system
•Defective fuel injection pump or
nozzle
•Starting motor cranks engine
sluggishly
•Preheating pilot lamp does not lightup
•Defective compression
•Defective valve clearance
•Too much oil in oil pan
•Lack of fuel
•Clogged air cleaner element
•Defective nozzle
•Defective compression
•Defective turbocharger
•Defective nozzle
•Low grade fuel being used
•Overheating
•Damage inside muffler
•Excessive valve clearance
OPERATION
Remedy
•Add oil to specified level, see CHECK
BEFORE STARTING
•Replace cartridge, see EVERY 250
HOURS SERVICE
(•Check, repair)
(•Replace)
•Check, add and repair, cooling water,
see CHECK BEFORE STARTING
•Adjust fan belt tension, see EVERY
500 HOURS SERVICE
•Change cooling water, see WHEN
REQUIRED
•Clean inside of cooling system
•Clean or repair, see WHEN
REQUIRED
(•Replace thermostat)
•Tighten cap or replace packing
(•Replace)
•Add fuel, see CHECK BEFORE
STARTING
•Repair place where air is sucked in
(•Replace pump or nozzle)
•See ELECTRICAL SYSTEM
•See ELECTRICAL SYSTEM
(•Check, repair)
(•Adjust valve clearance)
•Add oil to specified level, see
CHECK BEFORE STARTING
•Add oil, see CHECK BEFORE
STARTING
•Clean or replace, see WHEN
REQUIRED
(•Replace nozzle)
(•See defective compression above)
(•Clean or replace turbocharger)
(•Replace nozzle)
•Change to specified fuel
•Refer to "Coolant temperature moni-
tor lights up" as above
•Replace muffler
(•Adjust valve clearance)
3