Sampo Rosenlew HR46, Instruction Manual

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13
A
B
Traction transmission
Engine power is transmitted to the consecutive
work and drive pumps by means of a flexi
switch. From the pump to the hydraulic motor
of the gear box the power is transmitted by
means of liquid. The pump output is adjusted
steplessly using the drive pedal between
positions 0 and +/- maximum.
The harvester has 2-speed hydraulic motors in
the wheel hubs. Slow speed range should be
used in difficult terrain. In High speed range
speed is doubled. Normally, at start slow speed
range is selected. Pressing the driving speed
range selector button when driving (left button
keypad) goes the high speed range on. After
a stop slow speed range is selected again. If
you want to drive fast all the time, press the
button at a longer period of time when staying
stationary. Similarly, to get back on the slow
speed range, press the button for longer period
of time when staying stationary.
The speed of the harvester is controlled by drive pedal A. When the pedal is not pressed, the
harvester is stationary. Driving direction (forward/backward) is chosen by switch close to left
joystick (switch A, fig. 13a). Drive direction forward is selected by pushing switch forward.
Correspondingly drive direction backwards is selected by pushing switch backwards. When
driving forward, pressing the pedal B (fig. 13) changes drive direction backwards for a period
of the pedal is pressed. Speed is controlled by pedal A. Also the engine speed (r/min) and
potentiometer B (fig 13a) near left joystick affect the speed.
When driving in traffic, the harvester head should be kept close to the harvester and tied. The
harvesting computer must be switched off in case of unintended crane movements.
When parking forest harvester equipped with hydrostatic transmission, the parking
brake must always be engaged. The hydraulic motor cannot keep the harvester
stationary for a long period.
Four wheel drive
4-wheel drive is switched on electrically using switch L on the right-side instrument panel, fig.
2. The coupling shall be done with the harvester stationary. 4WD is available on both speed
ranges. When towing the harvester, four-wheel drive must be off and the engine running to
allow the wheel motors to be disengaged. Tap near the oil tank should be in towing position.
Short-distance towing at a low speed is permitted if the engine and the drive pump cannot be
kept running.
Four wheel drive lock
There are sometimes situations when some of the wheels do not have sufficient grip in respect
to the required traction power. In this case the wheel stops gripping, which will further decrease
the traction power. This can be avoided by engaging Traction transmission lock using switch M,
(fig. 2). The engagement of the Traction transmission lock generates anti-skid between wheels.
The lock does not hold 100 %. Thus it allows different wheels to turn at a different speed. On
solid ground the 4WD lock makes turning difficult, so it should be switched off.