Name: Komatsu WA470-6 2006
Brand: Komatsu
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3.7 Troubleshooting Operation

3-176 WA470-6H – VEAM946100

Engine

! ( ): Always contact your KOMATSU distributor when deal-

ing 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 caution pilot

lamp lights up

! Low engine oil pan oil level

(sucking in air)

! Clogged oil filter cartridge

! Defective tightening of oil pipe

joint, oil leakage from damaged

part

! Defective monitor

! Add oil to specified level.

See CHECK BEFORE START-

ING

! Replace cartridge.

See EVERY 500 HOURS SER-

VICE

! (Check, repair)

! (Replace)

Steam is emitted from top part of

radiator (pressure valve)

Water temperature gauge is in red

range

Coolant temperature monitor lights

! Low cooling water level, leakage

of water

! Defective fan pump motor

! Dirt or scale accumulated in

cooling system

! Clogged radiator fin or damaged

fin

! Defective thermostat

! Defective thermostat seal

! Loose radiator filler cap (high

altitude operation)

! Defective monitor

! Check, add cooling water, repair.

See WHEN REQUIRED

! (Check, repair)

! Change cooling water, clean

inside of cooling system.

See WHEN REQUIRED

! Clean or repair.

See WHEN REQUIRED

! (Replace thermostat)

! (Replace thermostat seal)

! Tighten cap or replace packing

! (Replace)

Water temperature gauge is in white

range on left

! Defective thermostat

! Defective monitor

! (Replace thermostat)

! (Replace)

Engine does not start when starting

motor is turned

! Lack of fuel

! Air in fuel system

! No fuel in fuel filter

! Defective injection pump or

_nozzle

! Starting motor cranks engine too

slowly

! Starting motor does not turn

! Preheating pilot lamp does not

light up

! Defective valve clearance

(Defective compression)

! Add fuel.

See CHECK BEFORE START-

ING

! Repair place where air is sucked

! Fuel filter with fuel.

See EVERY 500 HOURS SER-

VICE

! (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

! Add oil to specified level.

See CHECK BEFORE START-

ING

! Change to specified fuel

Brand	Komatsu
Model	WA470-6 2006
Category	Front End Loaders
Language	English

Komatsu WA470-6 2006 User Manual

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Komatsu WA470-6 2006 Specifications

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