MAINTENANCE
3-46 WB140-2N, WB150-2N
DRAINING HYDRAULIC OIL TANK
(Only for machines in which the synthetic biodegradable oil type
HEES is used).
This operation serves to let condensation accumulated on the tank
bottom to flow out of the tank itself.
Perform the following operations in the given sequence:
1. Remove screws (1) and platform (2), using a 17 mm wrench.
2. Loosen filler cap (3) to release residual pressure from the tank,
using a 24 mm wrench.
3. Remove drain plug (4) and let condensation flown out of the tank
completely, using a 41 mm wrench.
4. Reinstall filler cap (3) and platform (2).
★ Draining the tank must be done at temperatures exceeding 0°C
(32°F), before starting the engine. When temperature is below 0°C
(32°F), hydraulic oil tank must be drained at the end of work, or
when temperature of the machine is sufficiently high, to prevent
condensation from freezing and allow it to flow out of the tank.
• Stop the engine, and place machine in the correct posi-
tion to perform maintenance operations. Eliminate resid-
ual pressures from the equipment (by moving the
controls more than once) and from the tank (by slowly
loosening the filling cap).
• Let the oil cool down until it reaches 40-45°C (104-113°F)
before performing any maintenance.
• Immediately clean any area dirty with oil.
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