Steering System - Valtra A75n Operator's Manual

Power take---off
C 4.6.
The power take---off works fully independently of the
gearbox. It has its own clutch disc in the twin clutch which
is attached to the flywheel. Engagement and
disengagement of the power take---off is via the PTO
clutch control lever of the clutch disc. Power is transmitted
from the flywheel to the power take---off through a power
take---off shaft which runs through the gearbox.
With the PTO selector control lever, located on the right
side of the driving seat, you can select either 540 RPM or
1000 RPM, alternative equipment 540E (750 RPM) PTO.
Front PTO (extra equipment) shaft's nominal speed is
1000 RPM (at an engine rotating speed 2120 PRM).
Brake system
C 5.
The oil bath multi---disc brakes are located between the
differential and final drive gears in the final drive housing.
The brakes operate hydraulically from the brake pedals.
When both brake pedals are depressed the front wheel
drive is engaged automatically (4WD indicator lamp lights
on instrument panel) in order to provide braking function
at the front wheels. The pedals can be connected together
and used as running brakes or separated and used
individually as steering brakes.
The parking brake is mechanically operated and operates
on the main brakes and engages the 4WD
electrohydraulically (4 WD models, parking brake and
4WD indicator lamps light on instrument panel).
The brakes can be adjusted by means of adjusting nuts
which are fitted on the rear axle.
A trailer brake valve and the air pressure brakes are
available as extra equipment (not in open cab models).
A3565---21
The tractor has a hydrostatic steering system meaning
that the steering movement from steering wheel to the
front axle is transmitted by means of oil under pressure.
This makes the hydrostatic steering particularly easy to
use. If the oil pressure in the steering system should
collapse for any reason, steering is still possible by hand.
The steering valve then acts as a pump, although steering
will be considerably heavier.
The tractor hydraulic system has a priority valve, which
ensures that there is always sufficient oil for the steering
system.
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Steering system

C 6.
C. General description
65---7