Structure Of The Column Lift - stertil-KONI ST 1055 Installation, Operation & Service Manual

- At a difference in height of over 1 1/4" and less than 2 3/8", lowering is interrupted. A lifting
fork may be blocked; the cause of the failure must then be traced first. Lifting is still possible, the adjustment
valve in the hydraulic system will open and remain open until the difference has been cancelled out.
- At a difference in height of over 2 3/8" mm, the control voltage is switched off, thus blocking all
movements. The cause of the failure can then be traced.
In addition, the control system has been designed so that:
- Each lifting column can be operated separately
- Any pair of axles can be handled separately
Also see section 6, Operation
3.1

STRUCTURE OF THE COLUMN LIFT

Each lifting column consists of (see figure 3.1):
- a column and a lifting cylinder
- a hydraulic unit
- a control box
- a pallet jack lifting mechanism
- a mechanical safety lock
• Hydraulic unit
The hydraulic system consists of an electrically driven pump, flow control valves, control valves and a liquid
reservoir.
• Column and lifting cylinder
The column and lifting cylinder form the major part of the mobile column lift. In the U-section of the column
are a guide block and rollers. The rollers enable the guide block to move along the full length of the column.
The hydraulic lifting cylinder provides the lifting capacity.
• Control box
The control box has all the functions controlling the use of the lifting column. The control box of the primary
column is provided with a three-position switch allowing the lifting column to be used as a secondary column if
necessary.
The control box components and functions have been specified in sections 5 and 6.
• Pallet jack mechanism
The two-wheel pallet jack mechanism serves to move the lifting column. The two wheels protect the lifting
column from being turned over at the back when it is moved. The pallet jack mechanism lifts the back of the
column off the ground so that the column can be easily moved.
The pallet jack mechanism is operated by means of the handle bar and the handle inside the bar.
The handle can be set in three positions:
1. When the handle is set in the upper position, the pallet jack mechanism is lowered.
2. The middle setting is the neutral position; the column can be moved without the system being lifted or lowered.
3. When the handle is in the lower position, the pallet jack mechanism can be raised by moving the handle up and
down.
• Mechanical safety lock
If the hydraulic pressure fails while a vehicle is on the lifting system or is lifted or lowered,
a mechanical safety lock ensures that it cannot drop.
The characteristic clicking of the safety lock indicates that it has been activated.
During lowering the pawl is retracted by a solenoid.
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