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Pneumatic tracking on a wide belt sander.2/19
Having trouble getting the head to oscillate on a RB-25 powermatic sander. Downloaded a user manual to verify it is wired and initial setup is per the book. Need trouble shooting guidance, this model has three air controls on the side with the "U" shaped belt surround not shown in manuals I could find online. All work, air flow control knobs.
Rob at 270-365-2543
The double action cylinder that controls the belt oscillation may be stuck. Some moisture in there, or lack of lubricating oil can cause that. Try taking the cylinder apart, clean it and shoot some WD-40 in there.
After reassembly, make sure the automatic oiler on the air regulator is full and working properly.
Hopefully you have a refrigerated air dryer between your compressor and the sander. If not, you will get moisture in the cylinder and it will seize again.
I have an RB25 also. I use mine everyday and have never had a problem. Let me know if you need me to check anything for you. Like Duster said check the cylinder it is stuck it sounds like.
Thank you to both of you.
You just have to play with the 3 air adjustment valves. I think one controls how fast the oscillation is and the other two control left and right...cant remember for sure but it is a thing where you have to get the 3 valves and the adjustment knob all to play nice together and it just takes some time. Once you get it dialed in it should be good for years and years. I have not had to play with anything on mine in a long time. Its been a very solid machine for me.
My old Timesaver had an electric eye that activated the air cylinder movement. If the eye got too much dust on it tracking would fail.
You haven't talked about what is the tracking generator on your PM but I'd suggest checking into that next.
I have a smaller wide belt with the photo eye system, bought new in 1995. Have to keep it clean but is very easy to reset if a belt goes too far when conditions create excessive dust within the housing that my dust collection system can not remove.
If I can not get it by this weekend it is going up for sale. 10 hp 2011 year made with extremely low hours. Need another?
You're just firing up the machine again; make sure your belt is spinning in the right direction. I recently helped someone having the same issue and it turned out that the belt was spinning in the wrong direction, and as unlikely as it was for that to be the cause of the tracking issue, it tracked perfectly once I corrected it.