700 Series
Operating instructions
21
Drive control
AVANT 700 series loaders are equipped with a hydrostatic drive system, there is a
variable displacement hydraulic pump in the drive circuit. The oil flow of this drive
pump is steplessly adjusted with the two drive pedals. The drive pedals act in a
proportional way to control the drive speed and power available at the drive motors.
This hydrostatic driving system has different operating characteristics to a mechanical
drive. To get maximum pushing power push the pedals lightly for higher travel speed
push the pedal harder.
When thinking about the function of the two drive pedals, they should be compared
to gears, not to a conventional throttle pedal. The drive pedal in a way shifts on a
higher gear the more the pedal is pressed. Therefore you shouldnt press the pedal
more when the engine starts to struggle. Pressing the pedal just causes the engine
to stop.
When you want to have a high pulling force:
1. Use high engine revs
2. Select a relatively slow drive speed with the drive pedal. That is: press the pedal
only lightly (= select a low gear). This way the full output of the hydraulic system
and the engine can be taken out.
Driving of the machine
is controlled with the drive pedals and hand throttle
as follows:
Select the revs of the engine with the
hand throttle lever
on the control panel.
The basic rule is: use lower revs for lighter work and higher revs for hard work. When
driving, the revolution speed of the engine can be adjusted with the hand throttle
lever, if necessary. Do not turn the machine with a high travel speed. Hand throttle
also has an effect on the operation speed of a hydraulically driven attachment: the
more throttle the faster the attachment operates. Make sure not to exceed max.
allowed oil flow of the attachment.
If you want to
drive forward
, press gently on the
right
drive pedal until the machine
starts to move slowly. The desired drive speed is selected with the drive pedal: the
more the pedal is pressed the faster you will travel.
When you
wish to stop
gently release the pedal by lifting of your foot, and the
machine will slow and stop.
Drive backward
is controlled with the left drive pedal in the same way as drive
forward: the more the pedal is pressed the faster you will travel.
Familiarise yourself with the driving of the machine on low speed and on a flat, even
and open place where unintended movements dont 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.
ATTENTION!
AVANT 750 is equipped with two drive speed ranges. Always start
the operation with the lower speed range. See page 15 for instructions how to use
the drive speed range selection switch.
Hydraulic oil temperature has an effect on the hydrostatic transmission of the loader. When
ambient temperature is below 5º C, let the engine run and the machine warm up properly before
starting to drive. Drive carefully until the machine reaches its normal operating temperature.
When hydraulic oil gets warmer, driving characteristics of the transmission change. When the oil
is warm and hydraulic oil cooler has switched on, stopping distance of the machine can be longer
than normally. If the machine is used constantly in high ambient temperatures, hydraulic oil type
and viscosity must be suitable for these conditions. Contact Avant service.
Should there be a disturbance or malfunction in the hydrostatic transmission and consequently
the braking force is not sufficient, engage the mechanical parking brake. Parking brake can also
be engaged during driving if necessary.
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