2
Aerial work platform
ZED 20.3 HV
COD. UM0284_GB | REV. 0.0 | ED: 09/17
GB
Chapter 12
TROUBLESHOOTING
iSSUE
CAUSE
rEMEDY
*
The machine lifts but cannot
support the load
Worn cylinder seals
Replace seals
■
Valves incorrectly
adjusted
Adjust the valves
■
Jack valves dirty or
worn
Replace the valves
■
The machine does not rotate
correctly
Vehicle inclined
beyond the maximum
permissible latness
Stabilise the vehicle within
the permissible tolerance
range
Valves on the distributor
are poorly adjusted or
dirty.
Calibrate or clean the valves
■
Malfunctioning slewing
gear
Replace the slewing gear
■
Creaking of joints and bushings
Lack of lubrication
Grease the joints or
bushings
Stabiliser cylinder seal failure
Dirty lock valves
Clean or replace the valve
■
The levers do not control any
movement
Worn cylinder seals
Replace seals
■
Emergency stop button
pressed
Rotate the button until it
reaches normal position.
Solenoid valve blocked
Dirt inside
Use the solenoid valve
cursor to try to unblock it
and contact a specialised
service centre
■
Defective solenoid
valve
Replace solenoid valve
no power
Faulty fuse
Replace the fuse
noisy pump
Viscosity of hydraulic oil
is too high
Use the recommended
hydraulic oil
Level of hydraulic oil in
the tank is too low
Top up with the same type
of hydraulic oil
Suction pipe is blocked
or crushed
Check the pipe for damage
■
Air entering via the
suction lange
Check the tightness of the
seals and replace the gasket
■
Some hydraulic components of
the machine are working slowly
Maximum pressure
valve on the distributor
of the section of
the circuit that is
malfunctioning is
incorrectly adjusted or
the shutter of which is
open because of dirt.
Readjust the valve Remove
and clean it, then reinstall
with new metal seals.
Replace the valve
■
Worn out pump
Replace the pump
■
