I've got a 2003 1825b with a little slop in the drive chains. My manual is pretty vague about how to adjust the tension. All it says is to loosen the four bolts on the axle housing, then tighten up the chain adjusting bolt until the chains are tight, then back off a quarter inch. The problem is that I can't move the axle housings at all, either with the adjustment bolt or with a few good taps of the hammer...it's almost like they're seized in place. Any thoughts? Is there a gasket underneath the axle housing? Any thoughts greatly appreciated.