AVANT 635 - Drive Speed and Parking Brake Controls; Drive Speed Range Selection; Parking Brake Switch Operation

29
600 Series
Speed range switch
Speed range with
standard tires
0-7 mph 0-14 mph
Pulling force, forward 100% 50%
Pulling force, reverse 100% 25%
Drive speed range selection switch
Avant 640 is equipped with two-speed hydraulic drive
motors. Drive speed range can be selected with the switch
on the control panel right (see page 24). In addition to
speed, the speed range switch affects the pulling force as
shown in table below.
Higher speed range is intended for longer
travels where high pulling force is not necessary.
Risk of abrupt movement - Do
not change the drive speed
range while driving with a higher
speed. Always stop the machine
rst or slow down the speed before
switching on higher or lower speed.
Risk of loss of control - Be careful
when driving at higher speed
range. Abrupt control movements
can tip the loader over. Do not turn
the steering wheel quickly when
you drive at high travel speed. Drive
slowly whenever carrying loads,
driving on inclined or rough terrain,
or on slippery surfaces. Always
reduce speed before sharp turns.
Drive release valve
The switch with the text LOCK
controls a valve, which is used to
divert the oil ow between left and
right side hydraulic motors. This
affects the pulling force.
LOCK OFF: In this mode, the
hydraulic oil ows in series from motor to motor. The
wheels will roll more freely and the loader leaves less tire
marks on soft surfaces.
LOCK ON: In this mode the hydraulic oil ows in parallel
between the hydraulic motors in each side, similar to a
differential lock in operation. This improves the towing
capability of the loader.
Parking brake switch
Avant 630/635/640 is equipped with a hydraulic parking
brake. The parking brake is operated with the switch on
the control panel right (see page 24). On cab LX/DLX the
switch is located in the panel up right.
• A red indicator on the switch lights up when
parking brake is engaged.
• The green backlight under the “P” is lit all
the time.
The parking brake engages automatically when the engine
is stopped. The brake can be released only when the
engine is running and there is hydraulic pressure in the
system.
Risk of sudden stop - Do not
engage the parking brake when
the machine is moving unless in
emergency. Using the brake while
moving may cause the locking of
wheels and sudden stopping of the
machine.
If the parking brake is engaged
repeatedly when the machine is
moving the brake plates in the
drive motors will get worn quickly.
Always stop the machine before
engaging the brake.
Anti slip valve (option)
The anti slip valve positively diverts oil ow between the
right and left side hydraulic motors and improves traction
on slippery and uneven surfaces. It is engaged by pressing
continuously on the switch on the joystick. As soon as the
switch is released, anti slip valve is
released.
The function of the anti slip valve
depends also on the position of the
drive release switch.
LOCK ON: Anti slip valve diverts
oil ow between all four hydraulic
motors - all four wheels have best
possible traction. Use sufcient
engine revs and press properly on the drive pedal.
LOCK OFF: Drive released – the anti slip valve diverts
the oil ow between the front left and right hydraulic motor
only, not the rear hydraulic motors.
Operating instructions