TROUBLES AND ACTIONS OPERATION
3-248
Engine 3
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 Main causes Remedy
Engine oil pressure monitor lights
up
•Engine oil level is low in oil pan (suck-
ing in air)
•Clogged oil filter cartridge
•Defective tightening of oil pipe, pipe
joint, oil leakage from damaged point
•Disconnection, broken wiring to sen-
sor
•Defective sensor, defective monitor
•Add oil to specified level, see
CHECK BEFORE STARTING
•Replace cartridge, see
EVERY 500 HOURS SERVICE
(•Check, repair)
(•Repair)
(•Replace)
Steam is emitted from top part of
radiator (pressure valve)
•Cooling water level is low, leakage of
water
•Dirt or scale accumulated in cooling
system
•Defective engine water level sensor
•Defective engine water temperature
gauge
•Abnormal rotation of the cooling fan
on the radiator side
•Clogged radiator fin or damaged fin
•Defective thermostat
•Defective thermostat seal
•Defective water pump
•Loose radiator filler cap (high altitude
operation)
•Disconnection, broken wiring to sen-
sor
•Check, add coolant, see
CHECK BEFORE STARTING
•Clean or repair, see EVERY
500 HOURS SERVICE
•Change cooling water, clean
inside of cooling system, see
WHEN REQUIRED
(•Replace engine water level
sensor)
(•Replace engine water temper-
ature gauge)
•Ask for an inspection by the
distributor
•Clean or repair, see EVERY
500 HOURS SERVICE
(•Replace thermostat)
(•Replace thermostat seal)
(•Check,replace,repair)
•Tighten cap or replace packing
(•Repair, connect wiring)
Radiator water level monitor lights
up
Engine water temperature gauge is
in red range
Engine water temperature monitor
lights up
Engine water temperature gauge
display stays at lowest level and
does not rise
•Defective water temperature gauge
monitor
•Defective thermostat
•In cold weather, cold wind is blowing
strongly against engine
•Abnormal rotation of the cooling fan
on the radiator side
(•Replace water temperature
gauge monitor)
(•Replace thermostat)
(•Install radiator curtain)
•Ask for an inspection by the
distributor
Engine does not start even when
starting motor is turned
•Lack of fuel
•Air in fuel system
•No fuel in fuel filter
•Starting motor cranks engine slowly
•Fuel cut knob is pulled out
•Defective valve clearance, defective
compression
•Add fuel, see CHECK
BEFORE STARTING
(•Repair place where air is
sucked in)
•Fill filter with fuel, see EVERY
500 HOURS SERVICE
•See ELECTRICAL SYSTEM
•Push fuel cut knob back in
(•Adjust valve clearance)
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