Valve Block - Husqvarna PT26D Workshop Manual

Valve block

The machine has three valve blocks.
Flushing valve
The flushing valve (10) is included in the
drive system and has the task of replacing
the oil in the drive circuits so that the return
oil from the motors is lead to the tank (14) via
the cooler (12).
The flushing valve has a gate valve, which
detects the highest pressure from the axial
piston pump's A- or B-side and directs the
return oil from the pressure on the low-pres-
sure side to the pressure limiter, which opens
at 1.5 MPa (15 bar). The oil is then piped to
the tank via the cooler.
Valve block transmission
The block (6) controls the high or low gear as
well as the differential lock with solenoid
valves.
The solenoid valve 2 controls the rear wheel
circuit.
Solenoid valve 3 controls the differential lock
and the flow distributor.
Valve block working hydraulics
The valve block (5) controls the functions that
are supplied with pressure from the pump for
the working hydraulics. Control of the lift sys-
tem for the cutting unit takes place with sole-
noid valves. The valve block is prepared for
installation of additional solenoid valves and
cables, which are included in the hydraulic
accessory kit.
Solenoid valve 2 regulates pressure between
1.8 MPa (18 bar) and max 12 MPa (120 bar)
Solenoid valve 3 provides floating position
when weight transfer is nor selected
Solenoid valve 4 releases oil to the lifting cyl-
inder's piston side.
Restrictor C controls lifting and lowering speed.
DESIGN AND FUNCTION
Flushing valve
Flushing valve gate valve
Valve block transmission
Valve block working hydraulics
8043-188
8043-189
8043-190
8043-191
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English-