Clean Inside Of Cooling System - Komatsu PC15MRX-1 Operation And Maintenance Manual

MAINTENANCE

CLEAN INSIDE OF COOLING SYSTEM

Immediately after the engine is stopped, the coolant is at a high temperature and the radiator is under
high internal pressure.
If the cap is removed to drain the coolant in this condition, there is a hazard of burns. Wait for the tem-
perature to go down, then turn the cap slowly to release the pressure before removing it.
Cleaning is carried out with the engine running. When standing up or leaving the operator's seat, set
the safety lock lever to the LOCK position.
For details of starting the engine, see "BEFORE STARTING ENGINE (PAGE 3-21)" and "STARTING
ENGINE (PAGE 3-31)" in the OPERATION section.
There is danger of touching the fan if the undercover is left removed.
Never enter behind the machine when the engine is running.
Clean the inside of the cooling system, change the coolant and replace the corrosion resistor agent KI according to
the table below.
Kind of coolant
Permanent type anti-
freeze (All season type)
Nom permanent type
antifreeze containing eth-
ylene glycol (winter, one
season type)
When not using anti-
freeze
Stop the machine on level ground when cleaning or changing the coolant.
Use a permanent type of antifreeze.
If, for some reason, it is impossible to use permanent type antifreeze, use an antifreeze containing ethylene glycol.
Super Coolant (AF-ACL) has an anti-corrosion effect as well as an antifreeze effect.
The ratio of antifreeze to water depends on the ambient temperature, but to obtain the corrosion resistance effect,
a minimum ratio of 30% by volume is necessary.
In areas where the water is hard, always add Komatsu genuine corrosion resistor agent KI. One packet of corro-
sion resistor agent contains 100g (0.22 lb). The standard density of the mixture should be 7g/liters (0.065 oz/US
gal).
When deciding the ratio of antifreeze to water, check the lowest temperature in the past, and decide from the mix-
ing rate table given below.
It is actually better to estimate a temperature about 10°C (50°F) lower when deciding the mixing rate.
Cleaning inside of cooling system
and changing coolant
Every year (autumn)or every 2000
hours whichever comes first
Every 6 months (spring, autumn)
(Drain antifreeze in spring, add
antifreeze in autumn)
Every 6 months or every 1000
hours whichever comes first
WARNING
Adding corrosion resistor agent KI
Every 1000 hours and when
cleaning the inside of the cooling
system and when changine cool-
ant.
MAINTENANCE PROCEDURE
4-23