Yes- you need to raise the upright until you can acess the bolts. Chain all the rails (you'll need at least a couple 3/8 chains) togeather and make sure they're secure by lowering the rails on the chains with the hydraulics. Take a good look at the chains and make sure they're looped clean- make sure the chain is supporting the rails- not something is caught in between them. It's very dangerous. If the rail comes down on your arm, or even worse your neck it will make for a very bad day! If your not sure- call your local Clark dealer- ask for one of the old-timer mechanics to do this for you. We've done alot of them!