OPERATION TROUBLES AND ACTIONS
3-131
Engine 3
q ( ): Always contact your Komatsu distributor when dealing with these items.
q In cases of abnormalities or causes which are not listed below, contact your Komatsu distributor for repairs.
Problem Main causes Remedy
Engine oil pressure monitor lights up
•Engine oil pan oil level is low (suck-
ing in air)
•Clogged oil filter cartridge
•Defective tightening of oil pipe, pipe
joint, oil leakage from damaged
point
•Defective engine oil pressure sen-
sor
•Defective monitor
•Add oil to specified level, see
CHECK BEFORE STARTING
•Replace cartridge, see EVERY
500 HOURS SERVICE
(•Check, repair)
(•Replace sensor)
(•Replace monitor)
Steam spurts out from top of radiator
(pressure valve)
•Cooling water level low, leakage of
water
•Loose fan belt
•Dirt or scale accumulated in cooling
system
•Clogged radiator fins or damaged
fins
•Defective thermostat
•Loose radiator filler cap (high-alti-
tude operations)
•Defective water level sensor
•Defective monitor
•Check, add water, repair, see
CHECK BEFORE STARTING
•Check fan belt tension, adjust,
replace
•Change coolant, flush inside of
cooling system, see WHEN
REQUIRED
•Clean or repair, see EVERY 500
HOURS SERVICE
(•Replace thermostat)
•Tighten cap or replace packing
(•Replace sensor)
(•Replace monitor)
Radiator water level monitor lights
up
Engine does not start when starting
motor is turned
•Lack of fuel
•Air in fuel system
•Defective fuel injection pump or
defective nozzle
•Starting motor cranks engine
sluggishly
•Preheating monitor does not light
up
•Defective compression
•Defective valve clearance
•Add fuel, see CHECK BEFORE
STARTING
•Repair place where air is sucked in,
see EVERY 500 HOURS SERVICE
(•Replace pump or nozzle)
•See ELECTRICAL SYSTEM
•See ELECTRICAL SYSTEM
(•Adjust valve clearance)
Exhaust gas is white or blue
•Too much oil in oil pan
•Improper fuel
•Set oil to specified level, see CHECK
BEFORE STARTING
•Change to specified fuel
Exhaust gas occasionally turns
black
•Clogged air cleaner element
•Defective nozzle
•Defective compression
•Defective turbocharger
•Clean or replace, see WHEN
REQUIRED
(•Replace nozzle)
(•See defective compression
above)
•Clean or replace turbocharger
Combustion noise occasionally
make breathing sound
•Defective nozzle (•Replace nozzle)
To Next Page
Loading...
Need help?
General
