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14
Just before the suspension arm reaches the descending position, the support
wheels reach the upper edge of the stair and lift the stair climber approximately
3/8 inch. This is normal and is used as an advance signal by experienced drivers.
As a matter of fact, you may already advance while the support wheels are in
contact with the floor. This results in smooth continuous down-the-stairs motion.
In the case of closed stairs with short step, for instance on the inside of narrow
circular staircases, the support wheels may touch the stair step and the stair
climber can move approximately 3 to 3-½ inches forward. This also is normal since
the stair climber will then be ready for advancing again anyway.
Unlike all other stair climbing hand trucks, the operator does not need to control the moving
parts to descend, as the support wheels operate automatically.
4.3. PLEASE PAY ATTENTION TO:
4.3.1. SHIFT OF BALANCE
When ascending the balance of the load changes as soon the sup-
port wheels start lifting the load. Operators quickly become accus-
tomed to this and compensate by tilting the handle. Initially, before
this operation becomes automatic, care should be taken at the point
where the support wheels take the load when ascending. There is a
forward movement of the machine which is easily compensated for
by tilting the handle backwards. Lowering backwards by 10° to 20°
before the support wheels start to lift eliminates any major forward
movement.
4.3.2. HOOKING IN UNDERNEATH THE STEP
Under normal operating conditions, with the load in a well-
balanced position, the moving support arm is always clear of the
underside of the upper step (see chapter 4.2). If the Stair climber
is laid back too far, the support arm will be tripped by touching
the tread it is on, causing it to rotate under the upper tread. The
electronics will go into overload mode and will need to be reset.
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