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Thanks Juiceman, and I appreciate everyone's kind feedback. I took a picture of the drawbar and although I'm certainly not an expert and I know its not pristine it certainly isn't as bad a some I've seen!
I am hoping you tell all of us that the drawbar holes are not egg shaped. I see that CAT pin, wishing the last person only used it, instead of anything that fit in the hole.
You surely have a tractor to be proud of. JM
Thanks so much for your help Eddie, you were exactly right, the ring holding the glass prises off and I was then able to hook the black gauge face out and clean everything out. All it needed was some lubrication on the tiny pivots and a good clean and it's back working perfectly. I tested it with my Mityvac and the needle maxes out at around 15psi. Just need to fit it back on the Tractor.
from memory the black glass retaining ring pries off by delicately and evenly working around the ring edges with the likes of a narrow wood chisel.
For the needle I normally use two small screw drivers--one each side--to gently pry the needle off its spindle--there are puller tools for this if you so desire.
For conventional gauges this has a bit of less technical stuff.
These found by Googling "oil pressure gauge repairs" for a few minutes.
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