Wacker Neuson 28Z3, Service Manual

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SHB 28Z3 EN – Edition 2.0 * 28z3s510.fm
5-29
Hydraulic system
5.11 Pilot valves
Joystick
• Pilot valve for bucket, boom, stick and upper carriage rotation
• Consists of a lever and four pressure reducing valves
F
T
P
2 3 1 4
Joystick characteris-
Pressure in bar (psi)
Joystick
position
(degrees)
Numbering for right-hand joystick.
Lef-hand side joystick 3 – 1 – 4 – 2
A
C
D
E
B
35 (507.6)
30
-0/+2.5
(435.1
-0/+36
)
6
-0.7/+0
(87
-10/0
)
0
2°
+/- 1°
18° 25'
+/- 1° 35'
20° 10'
+/- 1°
Pos. Designation Pos. Description (left-hand joystick) Description (right-hand joystick)
A
Control lever
1
Stick extension control Boom ram extension control
B
Rubber collar
2
Left-hand rotation control Bucket ram extension control
C
Linkage
3
Stick retraction control Boom ram retraction control
D
Universal joint
4
Right-hand rotation control Bucket ram retraction control
E
Guide plate
P
Supply from pilot oil supply unit Supply from pilot oil supply unit
F
Tappet
T
Tank line Tank line