2-99
PC210/240-ENG
16.6.3 ENGINE
• ( ): Always contact your Komatsu distributor when dealing with these items.
• In cases of abnormalities or causes which are not listed below, please contact your Komatsu distributor for
repairs.
Problem Main causes Remedy
Engine oil pressure monitor
lights up
Steam is emitted from top part
of radiator (pressure valve)
Radiator water level monitor lights up
Engine does not start when
starting motor is turned
• Engine oil pan oil level is low
(sucking in air)
• Clogged oil filter cartridge
• Defective tightening of oil
pipe joint, oil leakage from
damaged part
• Defective engine oil pressure
sensor
• Cooling water level low, water leak-
age
• 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 water level sensor
• Lack of fuel
• Air in fuel system
• Defective fuel injection pump or noz-
zle
• Starting motor cranks engine slug-
gishly
• Preheating monitor does not light up
• Defective compression
• Defective valve clearance
• Contaminated fuel
• Lift pump not working
• Fuel filter clogged
• Fuel lines blocked
• Add oil to specified
level, see “CHECK
BEFORE STARTING”
• Replace cartridge, see
“EVERY 500 HOURS
SERVICE”
(• Check, repair)
(• Replace sensor)
• Add cooling water, re-
pair, see “CHECK BE-
FORE STARTING”
• Adjust fan belt tension,
see “EVERY 1000
HOURS SERVICE”
• Change cooling water,
clean inside of cooling
system, see “WHEN
REQUIRED”
• Clean or repair, see
“EVERY 500 HOURS
SERVICE”
(• Replace thermostat)
• Tighten cap or replace
packing
(• Replace sensor)
• 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
(• Adjust valve clearance)
• Drain & clean fuel system
• Check/replace pump
• Change filters
• Check/blow out lines
16. TROUBLESHOOTING
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