Lowering; Mpj 1S; Mpj 2S | Mpj 3S - MAHA MPJ Series Original Operating Instructions

10.7

Lowering

Lowering safety
WARNING
The load must be lowered slowly and carefully to avoid crushing injuries.
Before lowering, the load on the supports must be lifted free in order to remove
the supports.
The instructions and procedure for lifting (at the beginning of this chapter)
must also be observed for free lifting.
The load and pit jack must be monitored by the operator during the entire lifting
and lowering process. In the event of irregularities, stop the lifting/lowering
movement and support the load appropriately
10.7.1

MPJ 1S

WARNING
When lowering, the lowering spindle must be operated slowly and carefully to
prevent damage to property and personal injury caused by sudden and rapid
lowering movements.
With both drive variants, the load is lowered by turning the lowering spindle
counterclockwise. A spring acts as an automatic reset. This closes the lowering
valve and stops the lowering movement.
When lowering without load, the lowering spindle can be turned
counterclockwise as far as it will go. In the case of automatically operated
jacks, this actuates the lowering valve and the piston rod is retracted using
compressed air.
10.7.2

MPJ 2S | MPJ 3S

WARNING
When lowering, the lowering spindle must be operated slowly and carefully to
prevent damage to property and personal injury caused by sudden and rapid
lowering movements.
The drain valve is opened by turning the drain spindle counterclockwise. The
load pushes the piston downwards. The further this valve is opened, the faster
the load drops.
The drain spindle has an automatic reset that closes the valve when released
and stops the lowering process.
If the load is on (crossbeam) and the spindle is unloaded, the dead weight of
the piston is not sufficient for the jack to lower completely.
If the drain spindle is turned counterclockwise as far as it will go in this
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