AVANT 225, Operator'S Manual, Page: 42 / 84

Avant 220/225
42
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Drive control
Principle of operation
AVANT 220/225/225LPG loaders are equipped with
a hydrostatic drive system. This is based on a
variable displacement hydraulic pump in the drive
circuit that is proportionally controlled with the two
drive pedals. Driving of the machine is controlled with
the drive pedals and hand throttle.

Suitable engine speed is selected with the
hand throttle lever on the control panel, and
desired driving direction and speed are
controlled with the drive pedals.

To get maximum pushing power push the
pedals lightly
– for higher travel speed push
the pedal harder.
The basic rule for the hand throttle is: use lower revs
for lighter work and higher revs for hard work or for
high travel speed.
WARNING
Familiarise yourself with the driving
of the machine on low speed and
on a flat, even and open place
where unintended movements
don’t cause problems or danger.
When you have learned how to
drive on low speed, increase
speed gradually and learn how to
drive with higher drive speeds.
Make sure that there are no
persons in the operating area of
the machine.
Drive pedals

Driving forward: press gently on the right
drive pedal until the machine starts to move
slowly.

To drive backward: press gently on the left
drive pedal.

When you wish to stop gently release the
pedal by lifting of your foot, and the machine
will slow and stop.
When you want to have a high pulling
force:
1.
Use high engine revs
2.
Press the drive pedal only lightly to select a
relatively slow drive speed. This way the full
output of the hydraulic system and the engine
can be taken out.
If the engine is overloaded while pushing, the
pedal shouldn't be pressed further. Instead, use
higher engine revs and push a pedal only a little.
Drive release and anti slip
Drive release valve
The hydraulic drive circuit has a built in drive release
system, which allows the wheels on the left and right
side of the machine to roll at different speeds to
leave less tyre marks on soft surfaces. The system
automatically limits the flow of hydraulic oil between
the hydraulic motors on each side, functioning in
similar way as a limited parallel differential lock,
increasing pushing force of the loader. The system is
always engaged.
Anti-slip valve (optional extra)
If the loader is equipped with optional anti-slip valve,
the valve positively diverts oil flow between the right
and left side hydraulic motors and improves traction
on slippery and uneven surfaces. Some oil will pass
between the left and right side of the loader, and also
through hydraulic motors themselves. This means
that even though all wheels do not slip and spin
equally, all provide maximum pushing force.
Allow the loader to warm up properly
Hydraulic oil temperature has an effect on the
hydrostatic transmission of the loader. When ambient
temperature is below 5º C, let the engine run on idle
and allow the engine and the hydraulic system to
warm up properly before starting to drive. Drive
carefully until the loader reaches its normal operating
temperature.