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Cat 321c hydraulic thumb

amtak

Member
Joined
Sep 13, 2016
Messages
5
Location
Elizabeth PA
I bought a 321c with a wet line on it and come to find out it is just for a hammer. I thought I cold put a thumb on it if i just got the joystick. It is much harder than that. I could do it with a foot pilot valve but I had a stem cell transplant and I have neuropathy in my feet so running a foot valve even for a hour would be hard. I think I can get everything done except the wire harness under the cab. I called cat and they don't have them. i would have to bring the machine to them and they would need to make them from scratch. I asked if they could give me the spec sheet and they said they are not permitted because they are proprietary. Can anyone get the spec sheet or can build them for me? PN 227-7040, 227-7041, 227-7042
Machine SN MCF00576 Any ideas would be greatly appreciated.
 

digger_hunter

Well-Known Member
Joined
Apr 20, 2012
Messages
215
Location
Massachusetts, USA
I might have a used solenoid set and control valves and the harness for this actually. We took off a fair few off cats. I'll get back to you on this. Have the thumb as well but the need to check if its in ok shape
 

RodEx

New Member
Joined
Aug 9, 2025
Messages
3
Location
Clinton, Missouri
Did you ever get this figured out? Have the exact same machine with plumbing but only one way flow with the foot pedal. Wanting to get the joysticks and change to two way flow to add thumb.
 
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