Hydraulic System - Valtra A75n Operator's Manual

Hydraulic system

C 7.
On the hydraulic system there are two oil pumps, whose
total capacity together is 52 l/min at an engine speed of
2270 r/min (max 55 l/min).
The hydraulic circuit controls:
--- steering system (prioritised)
--- linkage hydraulics
--- auxiliary hydraulics
--- trailer brake valve (extra equipment)
--- four wheel drive, through the pressure relief valve
--- differential lock, through the pressure relief valve
Hydraulic lifts
C 7.1.
Hydraulic three---point linkage
C 7.1.1.
The hydraulic lift has position control, lowering speed
control and draft control. Impulses for draft control are
obtained through the top link. The sensitivity can be
regulated by altering the fastening point of the top link.
Electro hydraulic three---point
C 7.1.2.
linkage
Not in open cab models.
C. General description
65---8,3
unit
When an electro---hydraulic Autocontrol B (ACB) is fitted,
the control levers are replaced with knobs and switches.
Pre---programmed/programed functions:
--- Draft control/position control combining ratio plus sensi-
tivity on the regulator, the sensitivity adjustment is auto-
matic.
--- Lowering speed (independent of load)
--- Transport height
--- Drive balance control system
Front linkage
C 7.1.3.
See more information in section K of the extra equipments
on page 132.
Valves for auxiliary hydraulics
C 7.2.
The tractor has two valves for auxiliary hydraulics as
standard. One valve can be changed to single --- or
double acting. Two additional valves can be fitted as an
optional accessory, also one valve can be fitted for the
trailer braking system. Single---lever control is used for
these standard valves.
Four quick---action couplings are mounted as standard at
the rear of the tractor. Provision has also been made for
the mounting of four extra couplings and brake valve
coupling.
---18---
A C8
(optional equipment)
65---8,2