my friend bought an old 690B john deer excavator- but the bucket and arm cyls. are toast ! I got lots of parts #'s for him off the jd site but can't get the actual specs for the cylinders. any tips?
If you're looking to replace the cylinders, just take some measurements from the old ones - however, you're not likely to find replacements that are exact enough to work properly. The cylinders might be made by John Deere, or they could come from Hitachi, which made a lot of JD excavator parts. If the cylinders just need resealing and rebushing, take them to a hydraulic shop - they can find the right seals and wipers, and they can hone them or re-chrome the rods if necessary.
