well of course they want you to buy their parts to insure you get the right parts to put back in the machine. ;o)
on that note i will say this,
o-rings come in all types of compositions so if the o-rings you have are the same size and type material as the ones in the jack then i cannot see why you couldn't use them.
BTW... a pallet jack is considered part of the material handling world so why not post here? a pallet jack has forks and it lifts so why not eh? ;o)
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