MAINTENANCE
SERVICE PROCEDURE
4-21
WHEN REQUIRED
4
CLEAN INSIDE OF COOLING SYSTEM
WARNING
q
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 temperature to go down, then turn the cap slowly to release the pressure before
removing it.
q
Cleaning is carried out with the engine running. When standing up or leaving the operator's seat, set
the work equipment lock lever and the parking lever to the LOCK position.
q
For details of starting the engine, see “CHECK BEFORE STARTING ENGINE, ADJUST (3-69)“ and
“STARTING ENGINE (3-88)“ in the OPERATION section.
q
Never walk in front of the machine when the engine is running.There is danger of touching the fan.
q
It is extremely dangerous to go under the machine to clean it when the engine is running. There is
danger that the machine may suddenly move. Never go under the machine when the engine is run-
ning.
Wash the inside of the cooling system and change the coolant (antifreeze) according to the table below.
*: Permanent type antifreeze shall meet the requirements of ASTM D3306-03.
Stop the machine on level ground when cleaning or changing the coolant.
The coolant has the important function of preventing corrosion as well as preventing freezing.
Even in the areas where freezing is not an issue, the use of antifreeze coolant is essential.
Komatsu machines are supplied with Komatsu Supercoolant (AF-NAC). Komatsu Supercoolant (AF-NAC) has
excellent anticorrosion, antifreeze and cooling properties and can be used continuously for 2 years or 4000 hours.
Komatsu Supercoolant (AF-NAC) is strongly recommended wherever available.
To maintain the anticorrosion properties of Supercoolant (AF-NAC), always keep the density of Supercoolant
between 30% and 68%.
Antifreeze coolant
Interval of cleaning inside of cooling system
and changing antifreeze coolant
Komatsu supercoolant
(AF-NAC)
Every two years or every 4000 hours which-
ever comes first
Summary of Contents for 76243
Page 2: ......
Page 3: ...FOREWORD 11 ...
Page 5: ...FOREWORD FOREWORD 1 3 q Machine equipped without cab Back pocket of operator s seat ...
Page 16: ...NECESSARY INFORMATION FOREWORD 1 14 ...
Page 17: ...FOREWORD NECESSARY INFORMATION 1 15 ...
Page 24: ...CONTENTS 1 22 ...
Page 28: ...SAFETY LABELS SAFETY 2 4 SAFETY LABELS 2 POSITIONS OF SAFETY PICTOGRAMS 2 ...
Page 289: ...SPECIFICATIONS 15 ...
Page 297: ...INDEX 17 ...
Page 298: ...INDEX 7 2 ...
Page 301: ...COLOPHON 18 ...