Komatsu WA250PT-5H, Operation & Maintenance Manual

Page: 117 / 255

OPERATION
Operation
Check before starting engine, adjust
3-59
Check coolant level, add coolant 0.
WARNING
Do not open the radiator cap unless necessary. When checking the coolant, always wait for the
engine to cool down and check the sub tank.
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 check the coolant level in this condition, there is a
hazard of burns. Wait for the temperature to go down, then turn the cap slowly to release the pres-
sure before removing it.
CAUTION
To top up coolant in the radiator, use a suitable climbing aid (for example a ladder) to climb up the back of
the machine.
1. Open top cover (1) at the front of the engine hood.
2. Check that the coolant level is between the FULL and LOW
marks on radiator sub-tank (2). If the coolant level is low,
add coolant through the coolant filler of sub-tank (2) to the
FULL level.
3. After adding coolant, tighten the cap securely.
4. If sub tank (3) is empty, check for coolant leakage, then
check the coolant level in the radiator. If the coolant level is
low, add coolant to the radiator, then add coolant to sub tank
(3). To top up coolant in the radiator, use a suitable climbing
aid (for example a ladder) to climb up the back of the
machine.
If the volume of coolant added is more than usual, check for
possible leakage.
Confirm that there is no oil in the coolant.
Check inflation pressure of tires 0.
Measure the inflation pressure with a tire pressure gauge while the tires are cool before starting work.
Check for damage or wear to the tires and the rims. Check for loose wheel hub nuts (bolts).
The appropriate inflation pressure differs according to the type of work, so see section “Handling the tires on
page 3-96“ for details.