Bishman tire machine knurled dogs/rollers

Anyone out there ever changed the 3 rollers that grab the rim on their Bishman tire Machine? Was wondering if a guy could use a home-machined Urethane 75D Durometer protector to slip over them or some such so as not to mar fancier wheels. I would be interested in whatever anybody has done for this situation. Thanks
 
I have an old Bishman that has probably done 10,000 tires in the last 50 years, can't answer your question, but were it me, would give it a shot. Should work if it grips the rim sufficiently. Mine are pretty worn, but still grabs. I only do about ten tires a year with it.
 

It would not allow it to grip the rim tight enough to allow dismounting of the tire. My bishman already has trouble now.
 
I've got an old Bishman up and running, got the knurled grabbers spinning freely but I found that the center shaft doesn't have the uumph to pull a bead all the way around (off or on) and I frequently have to grab the belt and spin the motor by hand - the belt slips or the motor stalls. Anyone got any ideas?
 
yeah mine is a little underpowered and stops the motor once in a while, if I really slobber the rim ease on the rim and bead it helps, also once in a while I use a tire iron to lift a little ahead of it. Still better than doing it all by hand. Paid fifty bucks for it 20+ years ago so it don't owe me anything.
 

Pump a wad of grease into the intake of the motor. Along with some oil.. the oil will soften up the old grease, and the new grease will help seal the motor seals. After reapplying air and running it a bit it helped my a bunch. That was over 10 years ago.
 
My motor drive is electric via 2 pulleys and a belt - For a second there I was trying to figure how to pump oil and grease into the old-school lubrication hole some electric motors have at the bearings (haven't checked this one to see if I could give it a drop or two of 3-in-1).
 
ive got an old Bishman too. This thread got me looking and found that one of my rollers is siezed up. Guess I've got some work ahead of me.
Do those bolts thread in, or is there a nut underneath?

Mine will slip the belt too, but I just let it, as I'd rather help it along than risk stripping the drive out. Figure the belt is the fuse in the system.

Sure like that old machine.
 
I just soaked mine with Blaster, heated it with a propane torch and broke it loose with channel-locks. Now it gets oiled yearly.
 

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