Winget 4B2000, Operator'S Handbook Manual

Page: 39 / 282

Hydraulic System Safety
(see also “Safe Working” section)
WARNING Do not allow oils to come into
regular contact with skin. This
can lead to serious skin
diseases. Medical evidence
suggests they may include
skin cancer.
Always wear protective gloves
when handling oils for
topping up, draining, or
refilling.
Always practise the greatest
cleanliness when servicing
hydraulic components.
Always clean the areas
surrounding filler points, filters
etc., before and after
servicing.
Dispose of waste oil into
waste oil storage tanks. if
storage tanks are not
available, consult your
Distributor or local authority
for addresses of local
designated disposal points.
It is illegal to dispose of waste
oil into drains or water
courses or to bury it.
Dumping hydraulic pressure
WARNING Always dump all hydraulic
pressure from the system
before servicing any hydraulic
component.
To dump pressure:
Stop the engine
.
Move the skip control lever several
times in each direction.
Description of hydraulic system
The hydraulic system provides power for
skip tipping.
The main components consist of:
Tank:
The tank is filled through a
filler/strainer which incorporates an oil
level indicator. The filler cap is fitted with
a breather. In the bottom of the tank is a
suction strainer.
Pump:
The pump is driven directly from
the engine.
Filter:
The filter is situated in the return
to tank hose from the control valve.
Tipping control valve:
The control valve
receives oil from the pump and delivers it
to the skip tipping rams. The rate of oil
flow to the rams is proportional to the
distance that the control valve lever is
moved.
If the control lever is held either fully
forward or backward after the rams have
reached their full stroke, a relief valve
opens, allowing the oil to return to the
tank.
Note: Hydraulically rotated skips
Hydraulically rotated skips on the 4B2000
utilise a load sensing steer valve and a
separate priority valve.
3.14 SERVICE
HYDRAULIC SYSTEM