Pinguely-Haulotte HA20PX, Repair Manual

Page: 68 / 282

Repair manual
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12.2.2 -Replacing an element
Before replacing an element, the machine must be put in the maintenance
configuration (see corresponding paragraph) and the electric power supply
cut off (see corresponding paragraph).
All distributing valves are "with open centre": breaking the electric circuit
therefore decreases pressure in the hydraulic circuits, up to the non-return
valves flanged on the cylinders. An element can be replaced safely, if the
procedures described in the maintenance sheets are respected (unscrew
hydraulic connectors slowly to release residual pressure).
To preserve the integrity of the safety systems and the technical
characteristics of the elevating platform, it is essential to use original parts
and to respect the initial setting and tightening torque values (see
corresponding paragraph).
12.2.3 -Locating the breakdown
Certain checks require the elevating platform to be switched on. In this
case, personnel must ensure:
• that the measurement devices used are properly insulated,
• that they do not touch the live parts,
• that they are not wearing or carrying metal objects that may deterio-
rate the live components (e.g.: dropping a spanner during an interven-
tion on the batteries).
12.3 - MAINTENANCE SYSTEM
:Photo 1 Instructions
Maintenance configuration:
• Position the elevating platform on a firm, horizontal surface.
• If possible, fold the machine completely. Otherwise, for specific ope-
rations, put the various components into slings.
• Put the turntable rotation blocking pin into place (ref Photo. 1,
page 62).
Restoring operational configuration:
• Remove the blocking pin (rep. 1 Photo. 1, page 62).
1