Aerial work platform
ZED 20.3 HV
13
COD. UM0284_GB | REV. 0.0 | ED: 09/17
Chapter 8
GB
MAINTENANCE
8.8
Tightening the screws
If you need to tighten the screws of the turret and the frame, tighten them using a manual torque
wrench (Fig. 8.7, Fig. 8.8, point 1) or an electric one (Fig. 8.6, Fig. 8.8, point 2).
The following tightening torques should be set when tightening, according to the screw material and
thread (ISO metric thread)
nominal screw
diameter
M = Tightening torque (Nm)
Class 8.8
Class 10.9
12 x 1.25
90.6
127
14 x 1.5
143
202
16 x 1.5
214
302
18 x 2.5
288
406
20 x 2.5
409
576
22 x 2.5
554
780
24 x 3
708
996
CAUTiOn
reduce M by 10% when:
•
tightening is carried out using cordless tightening machines
•
the screws are galvanised.
POSiTiOn Of PlATfOrM:
1)
transport position
2)
vehicle switched off
8.8.1
Tightening the turret screws
Fig.
8.5
The frequency at which the chains need to be tightened depends on factors such as the frequency
of use and the work environment. It is nevertheless possible to establish that under normal work
conditions, the screws of the turret should be checked and tightened after the irst 250 hours of
operation or the irst 3 months and generally least every 12 months or 1000 hours.
CAUTiOn
Do not exceed the values indicated by the dynamometric wrench.
