What each one does
A side shifter moves both forks laterally as a pair, typically around 100 mm either side of centre. The spread between the forks never changes — the whole load simply moves left or right so the operator can align with a pallet or place it tight against a trailer wall.
A fork positioner moves each fork independently, changing the spread between them. It sets the forks to match the pallet, closes them onto a load, or opens them wide to straddle something that is not on a pallet at all.
Which problem are you solving?
- Operators reversing and realigning to hit a pallet or a rack opening — side shifter.
- Operators climbing down to move forks by hand as pallet sizes change — positioner.
- Racking uprights and pallet stringers taking regular knocks — side shifter.
- Mixed inbound pallet footprints on the same shift — positioner.
- Loads that need straddling or gripping rather than forking — positioner.
The usual answer: a positioner with integrated side shift
Most positioners can be specified with side shift built into the same unit, and for a mixed operation that is normally the right purchase. One attachment, one installation, both functions — and the truck can centre the load and match the spread in the same movement.
The cost of that convenience is hydraulic: positioning needs one double-acting service and side shift needs a second. Where the truck has only one spare circuit, a solenoid selector valve can share it between the two functions at the price of a small amount of operator sequencing.
What both do to the truck
Both add mass and shift the load centre forward, so both derate the truck. A positioner is the heavier of the two, and a positioner with side shift heavier again. On a truck already working near its plated capacity that arithmetic sometimes decides the specification on its own — which is why we return the derated figure with every quote.