I got my jd 450b working great thanks to many helpful hints from people on this forum. I am preening her up to sell as I have finished my little landscaping project. I have one final problem I want to resolve before I list it. The left angle cylinder on the blade has gotten very weak and will yield under pressure from the straight angle and minus unless constant pressure is held on at the yoke control. The cylinder had a wear plate welded on where it had rubbed against the tracks. I have replaced the blade frame bushings since then but I think the heat from the welding may have damaged the integrity of the internals of the cylinder. I have never overhauled one of these and I don"t want to replace the whole unit. Anybody got any ideas which components probably need replacing as a result of heat damage. Would just a seal kit do it or will I need a new tube and or other new hardware.