Hydraulic System - Valtra T151eLS Operator's Manual

steering movement is transmitted from the steering wheel
by oil under pressure either to the front axle or to the
centre pivot. This makes steering particularly easy.
If the oil pressure in the steering system should fail for any
reason, steering is still possible by manual power, and the
The tractors hydraulic system has both a low pressure
circuit and a high pressure circuit.
The gear pump of the low pressure circuit controls:
--- steering system (prioritized)
---quick---shift gear
---powered front axle, disengaging
--- power take---off
--- differential lock
---shuttle lever
--- parking brake
--- moving of the range gear
--- trailer brake valve (extra equipment)
The high pressure circuit = the displacement pump of
the working hydraulic circuit controls:
--- linkage hydraulics
--- auxiliary hydraulics
Due to the LS---system of the displacement pump only the
necessary volume of the oil is supplied for the working
hydraulics corresponding to the pressure load.
The system has also a separate lubricating pump, which
supplies oil for:
C. General description
steering valve will act as a pump.
The tractor hydraulic system has a priority valve, which
ensures that there is always sufficient oil for the steering
system.

Hydraulic system

C 7.
--- the ejection of the high pressure circuit activating the
suction of the displacement pump (if necessary)
--- the lubrication of transmission and PTO
The max. capacity of the high pressure circuit pump:
115 l/min, at 2200 r/min.
The tractor has as standard an electro---hydraulic linkage.
The linkage is controlled through the electric
potentiometers and switches.
Pre---programmed functions:
--- draft control/position control combining ratio plus
sensitivity on the regulator, the sensitivity adjustment is
automatic.
--- lowering speed (independent of load)
--- transport height
--- drive balance control system, connecting of the driving
speed can be adjusted
--- slip control
Max. lifting capacity of the hydraulic lift is 8100 kg.
The front linkage is available as extra equipment.
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T1LS C9