607. CASTER WHEEL7.1 REMOVING OF THE CASTER WHEELFirst, let the pallet truck to be slanting, then dismantle four screws. Note to help the nut when turning thescrews. Then you can dismaantle the caster and replace it.7.2 ADJUSTING THE PRESSURE FOR THE DRIVE WHEELAfter using some time, the drive wheel might wear off, the pressure for the drive wheel will not be enough,and drive wheel can not bit into the ground and slip.You can adjust it according to following steps:Step 1: Loose the four bolts (do not need to dismantle them)Step 2: Take away one or two piece washer.