H Belly Pump Coupling Removal

Doug Kieta · Apr 28, 2020

I need to replace the oil seal on the belly pump shaft of my 51H. I have the pump out of the tractor and am trying to understand how the coupling in front of the seal is installed. Is it a threaded component or a keyed coupling? If threaded, is it a right hand thread or a left hand thread. I have tried to loosen it either way by tapping with a hammer and punch after locking up the gears with a large screwdriver, but so far have not been able to loosen it. I don't want to damage it, so am turning to you experts for some knowledge.

Thanks for the help.

Janicholson · Apr 28, 2020

Use a wider "tool" in the gears to lock the pump. the coupling is Right hand threads, (Lefty loosy) It is often just massively tight. If you have an impact air wrench, and a welder, use a cheap old socket and weld a 1/2" Bar across it. Use that as a tool to unscrew it. If no impact, putting the pump in a position to hold it from turning, and using a steel pry bar to put force on it CCW. and (with gloves on) strike the bar to shock it loose. Heating it is Ok, but not so hot as to ruin temper. Jim

Doug Kieta · May 1, 2020

I did not have the bar I needed so a friend of mine took the pump to their equipment rebuild shop and after reading your message he had the coupling off in about 5 minutes. The bonus is that he then pulled the seal and put the pump in their parts washer so it came home clean. As soon as my new seal arrives I will be back in business. Thanks for sharing your knowledge with us dummies. Stay healthy. We need your experience.

rustyfarmall · May 1, 2020

(quoted from post at 08:37:31 04/28/20) Use a wider "tool" in the gears to lock the pump. the coupling is Right hand threads, (Lefty loosy) It is often just massively tight. If you have an impact air wrench, and a welder, use a cheap old socket and weld a 1/2" Bar across it. Use that as a tool to unscrew it. If no impact, putting the pump in a position to hold it from turning, and using a steel pry bar to put force on it CCW. and (with gloves on) strike the bar to shock it loose. Heating it is Ok, but not so hot as to ruin temper. Jim

I did the bar trick, but instead of welding the bar to a socket, I welded the bar to a nut, that fits into a socket.

H Belly Pump Coupling Removal

Doug Kieta

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Janicholson

Well-known Member

Doug Kieta

Member

rustyfarmall

Well-known Member

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