Clean Inside Of Cooling System - Komatsu PW160-7H Operation & Maintenance Manual

SERVICE PROCEDURE

CLEAN INSIDE OF COOLING SYSTEM

Soon after the engine has been stopped, the coolant is
●
hot and can cause personal injury. Allow the engine to
cool before draining water.
Since cleaning is performed while the engine is running,
●
it is very dangerous to enter the rear side of the machine
as the machine may suddenly start moving. If the under
cover is left removed, it may interfere with the fan. While
the engine is running, never enter the rearside of the ma-
chine.
Never remove the radiator cap when the engine is at
●
operating temperature. At operating temperature, the
coolant is under pressure. Steam blowing up from the
radiator could cause personal injury. Allow the engine to
cool until the radiator filler cap is cool enough to touch
with your hand. Remove the filler cap slowly to allow
pressure to be relieved.
Opening Engine Compartment Hood
●
Whenever access is required to the engine compartment
via the hood, always ensure that the work equipment is
tipped as far forward as possible.
This will ensure that the hoses mounted on the work
equipment do not impede the engine hood when it is
opened/closed.
GENERAL
The cooling system operates under pressure which is controlled
by the pressure relief valve in the radiator cap.
The belt-driven water pump circulates the coolant through the
engine block, cylinder heads, radiator and engine oil cooler. Cir-
culation is controlled by the thermostat which by-passes coolant
flow around the radiator until the engine reaches operating tem-
perature.
Proper cooling is possible only when the system is sealed, the
radiator cap gasket is in good condition, the pressure relief valve
and thermostat are operating properly. The system is free of cool-
ant and air flow restrictions and the system is filled to the proper
level.
Selection and maintenance of the engine coolant is important to
long engine life. The following information provides recommenda-
tions for selecting the engine coolant, maintaining the coolant
inhibitors and servicing the cooling system.
The system operates successfully with a water/antifreeze mixture
or inhibited/conditioned water as the coolant. Water alone allows
rust, scale deposits, and corrosion to occur within the system.
Every 2000 hours, the cooling system should be drained, flushed,
and refilled as described in this section.
252
WARNING
MAINTENANCE
PW160-7H VEAM390100