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December 2019W11/W12/W13 | Operation manual
10.7.6 Servicing the hydraulic system
Risk of injury due to moving parts!
Never tip the driver's seat with the engine running. Scalding hazard due to hot hydraulic oil! Risk of injury due to
hydraulic oil escaping under pressure. A fine hydraulic oil jet under high pressure can penetrate the skin! See a
doctor immediately if oil gets in the eyes or skin! Open only depressurized hydraulic systems! Even when a wheel
loader with the lifting frame completely lowered and the engine stopped is parked on a horizontal surface, there
may be considerable residual pressure in parts of the hydraulic system. The residual pressure discharges gradually.
If a hydraulic system needs to be opened immediately after shutdown, the system must first be depressurized as
described in section 6. "DISCHARGING RESIDUAL PRESSURE IN HYDRAULIC SYSTEM".
Service the hydraulic system according to the inspection intervals specified in these operating instructions!
When carrying out servicing work on the hydraulic system, pay attention to utmost cleanliness! Contamination of
hydraulic oil by dirt or water can lead to premature wear or failure of the entire system.
Hydraulic oil cooler
The hydraulic oil cooler is located in the rear of the wheel loader. If the wheel loader becomes too hot during long
road trips or high ambient temperatures, check that the radiator is thoroughly clean throughout and that the fan is
working.
Ventilation filter/hydraulic oil filler neck (not on all models)
Renew the ventilation filter after 1000 service hours!
The ventilation filter is located on the hydraulic oil tank. It ensures that the hydraulic tank is ventilated when the
hydraulic oil level fluctuates. The ventilation filter contains a filter element that prevents the ingress of dust and dirt
and the leakage of oil droplets. There is a valve in the ventilation filter which keeps the tank pressure at approx.
0.5 bar. This pressure escapes when the hydraulic oil filler neck is opened!
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