Is this happening when the machine is sat over night or for an extended length of time?
You cannot swap cylinders to check as they are different, one is a master and the other is a slave.
We have had cylinder glands come loose but you would always have the fault then.
If it is over night it is the cylinder bleeding back, there is no cure for this it is just something they do when left, what you do is put the truck in 90 degree mode steer lock to lock then put back in straight, it should then line up. Later machines have this procedure on a label in the cab.
If the fault reoccurs when using the truck it is something else.
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