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JD 620 fan shaft disassembly

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Farmer MM

01-28-2023 08:29:53




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I'm putting new seals in the Power Steering Pump (on fan shaft). Ideas on "easy" way to remove the clips on the shaft end?




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Farmer MM

02-22-2023 16:41:16




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 Re: JD 620 fan shaft disassembly in reply to Farmer MM, 01-28-2023 08:29:53  
Hello, What torque do you use on your Power Steering Pump bolts?



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Farmer MM

02-16-2023 05:56:32




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 Re: JD 620 fan shaft disassembly in reply to Farmer MM, 01-28-2023 08:29:53  
Putting Power Steering Pump back together. How tight should the fan-shaft be going on the bearing?



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Farmer MM

02-06-2023 06:48:10




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 Re: JD 620 fan shaft disassembly in reply to Farmer MM, 01-28-2023 08:29:53  
I made the "tool" you suggested, and it worked PERFECTLY! I fine-tuned it by belling-out the upper portion to allow the clips to come out easier. Press took one-pump to dislodge them. Anyone planning to do this repair, I highly recommend this route.



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HFP

01-30-2023 06:40:14




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 Re: JD 620 fan shaft disassembly in reply to Farmer MM, 01-28-2023 08:29:53  
The last one I did I had two c-clamps on either side to compress the spring. Then slid a correctly sized socket (out of the spare tool bin) over the top and hit it with a BIG hammer many times to break that retaining collar free. I held the socket, my wife swung the sledgehammer. It was one of those relationship building exercises. I did break the drive disks getting them off (they were completely worn out anyway), they are still available new.

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Farmer MM

01-29-2023 08:21:21




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 Re: JD 620 fan shaft disassembly in reply to Farmer MM, 01-28-2023 08:29:53  
Never thought of a "drill press", good backup. I used my big press to push out/on all the bushings on a car suspension, and it worked great. I've been spraying Kroil Oil (best penetrating one I've found) on the shaft-clips/collar, hoping they won't stick.



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PJH

01-29-2023 07:46:46




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 Re: JD 620 fan shaft disassembly in reply to Farmer MM, 01-28-2023 08:29:53  
I used my drill press to compress the fan clutch spring.



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Mike(NEOhio)

01-29-2023 06:35:21




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 Re: JD 620 fan shaft disassembly in reply to Farmer MM, 01-28-2023 08:29:53  
My disks were kind of stuck on the splines. I used a punch/hammer to push the ring back but it beat up the ring some. The first disk came off OK but the second is the one I bent with the puller. I salvage the ring, had an old tapered pipe reamer that matched the angle so it cleaned up nice. Of course the splines got anti-sieze on reassembly. The disk didn't go back together flat. The sanding disk on my radial saw straightened it out.

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Farmer MM

01-28-2023 16:41:28




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 Re: JD 620 fan shaft disassembly in reply to Farmer MM, 01-28-2023 08:29:53  
Oooohh, don't want to do this! Glad old JB worked! It's saved my mind a few times.



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Mike(NEOhio)

01-28-2023 16:15:36




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 Re: JD 620 fan shaft disassembly in reply to Farmer MM, 01-28-2023 08:29:53  
The friction disks are cast zinc and brittle. I just pulled the shaft from my A, used a puller and bent one. It broke when I tried to straighten it in a press. JB weld fixed it up.



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Farmer MM

01-28-2023 11:42:53




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 Re: JD 620 fan shaft disassembly in reply to Farmer MM, 01-28-2023 08:29:53  
Quoting Removed, click Modern View to see

GREAT idea! THANKS!!!!!



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matthies

01-28-2023 10:23:12




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 Re: JD 620 fan shaft disassembly in reply to Farmer MM, 01-28-2023 08:29:53  
Get a piece of pipe and notch it on opposite sides. The pipe needs to push on the collar and have some clearance from the half wedges. Mark the pipe on the end at 3,6,9, and 12 oclock positions. Pipe only needs to be 4 inches or so, cut the pipe across at 3 and 9 then 6 to 12, down an 1.5 inch. Then cut two opposite legs off to make two pusher legs. Use your press and be careful, wedges can stick. This tool can be used to put the rubbers in a 4020 seat cylinder also.

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Farmer MM

01-28-2023 09:41:10




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 Re: JD 620 fan shaft disassembly in reply to Farmer MM, 01-28-2023 08:29:53  
I have an 8-tn shop press. Could make some collars/etc. ???



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Dan in Ohio

01-28-2023 08:49:40




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 Re: JD 620 fan shaft disassembly in reply to Farmer MM, 01-28-2023 08:29:53  
I use good quality C-clamps to compress the spring, still not an easy job.



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