Wacker Neuson Telehandler TH412 Operator's Manual page 165

Fig. 71
Pressing and holding the button 35 with the stacking
mode switched on (Fig. 69) can prevent the telescopic
boom from automatically extending when it is raised. For
safety reasons however, the boom cannot be lowered and
extended at the same time in the upper range.
BA TH412 * 06/2017 * 4512_5-9_Arbeitshydraulik_en.fm
35
Functional check of the Vertical Lift System (VLS)
Before starting work, fully raise and lower the unloaded
boom once with forklift mode switched on. The boom
must extend automatically in the upper range. When
lowered, the boom must retract automatically in the upper
range. If this is not the case, the Vertical Lift System is
malfunctioning. Do not work with the machine in this case.
The Vertical Lift System must be checked, adjusted and
repaired by qualified personnel.
Information
The Vertical Lift System (VLS) is a safety feature that
must always be checked for correct functioning before
starting work.
Operation 5
5-39