Operation & Service Manual (VA) 40 ST1175
Safety guidelines:
When operating an individual column lift, the maximum permissible elevation
difference is 2".
When operating two column lifts (per-axle control), the maximum permissible
elevation difference between the front and rear axles is 6".
With a tandem axle at the rear of the vehicle, the maximum permissible
elevation difference between both rear axles is 2".
Center of gravity and weight distribution
If one of the columns is lowered too far, it can have the following consequences:
No load on that particular column.
No load on the column diagonally opposite.
Double load on the remaining columns.
Overloading of columns
Columns used for extremely rigid vehicles (aircraft towing vehicles, trains) will
quickly overload if a single column is lowered 3/8" to 2".
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