Maintenance Section
-146-
Cooling System - Clean, Change
WARNING
At operating temperature, the engine coolant is hot
and under pressure.
Steam can cause personal injury.
Check the coolant level only after the engine has
been stopped and the filter cap is cool enough to
touch with your bare hand.
Remove the filter cap slowly to relieve pressure.
Cooling system conditioner contains alkali. Avoid
contact with the skin and eyes to prevent personal
injury.
Use all cleaning solutions with care.
The lift truck must be level, the forks lowered, the
parking brake engaged, the transmission in NEUTRAL
and the engine stopped and cool.
1. Turn the radiator cap slowly to relieve the pressure,
then remove the cap.
2. Remove the block drain plug.
Typical Example
3. Open radiator drain valve. Allow the coolant to drain.
Drain the recovery bottle.
4. Close radiator drain valve and install block drain
plug. Fill the cooling system with 1 kg (2 lb) sodium
bisulphate per 40 liters (10 gallons) of water. Most
commercial cooling system cleaners can be used.
5. Start and run the engine for 30 minutes.
6. Stop the engine and drain the cleaning solution.
7. Flush the system with clean water, until draining
water is clear.
8. Close the drain valve and install the block drain plug.
Fill the system with neutralizing solution, 250g (1/2
lb) sodium carbonate per 40 liters (10 gallons) of
water.
9. Start and run the engine for 10 minutes.
10. Stop the engine and drain the neutralizing solution.
11. Flush the system with clean water until draining
water is clear.
12. Close the drain valve and install the block drain plug.
Add coolant to the top of the filter neck.
13. Start and run the engine to stabilize the coolant level.
See “Every 10 Service hours or Daily”, “Coolant
Level-Check”, in this manual.
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