6
Aerial work platform
ZED 20.3 HV
COD. UM0284_GB | REV. 0.0 | ED: 09/17
GB
Chapter 5
SAFETY DEVICES
5.7
Maximum pressure valve
The maximum pressure valve (Fig. 5.5, 1), located under the vehicle stabilisation control panel,
prevents the maximum working pressure from being exceeded.
1
Fig.
5.5
5.8
Blocking valves on cylinders
The blocking valves are hydro-powered and if there is a lack of pressure (e.g. due to breakage of a
delivery pipe) they prevent the uncontrolled movement of the corresponding cylinder.
The on/off blocking valves (Fig. 5.6)
are located:
•
at the top of the stabilisers (2)
while the overcentre valves are positioned:
•
next to the turntable (1)
•
on the work platform (3)
•
on the articulated boom lifting cylinder (4)
•
on the telescopic boom extension cylinder (5)
•
on the telescopic boom lifting cylinder (6)
•
on the work platform levelling cylinder (7)
•
on the front beam extraction cylinders (8).
8
7
4
5
6
3
2
1
Fig.
5.6
