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Harry Ferguson Tractors Discussion Forum
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TO-20 oil pump rebuild

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Mark

04-07-2004 19:27:36




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I have just purchased an oil pump rebuild kit and have a few questions. After pressing in new bushings do they need to be honed or sized? What is the best way to put the aluminum gear onto the pump shaft? Can it be tapped on with a hammer and will it go on straight? How far on does the gear go? Can I attempt to drill & tap the hole in the shaft and gear with a hand drill or will the bit walk into the aluminum gear?

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GSHADEL

04-08-2004 13:09:33




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 Re: TO-20 oil pump rebuild in reply to Mark, 04-07-2004 19:27:36  
I rebuilt my oil pump last month. I can answer some of your questions. I chose to not press in the new bushing...., thought the existing bushing was OK, and I didn't have a hone or ream that size. I regretted it when I re-installed the oil pump, oil pump gear had a very slight wobble that I did not notice with just the pump shaft. If it is possible for you to hone or ream the bushing, it is a good idea just to make sure you didn't mushroom the end in a little while pressing in the bushings.
Press the gear on as far as possible, but still keep the pump free spinning. If you press the gear on too far, it will rub the pump housing and be hard to turn. You should end up with very minimal clearance between the pump housing and the gear. I didn't have the benifit of a press, I used a socket over the drive gear and tapped it on with a hammer. I was careful, and lucky, I got in on straight. I think you can buy a special tool for installing the gear if you want. I started to use a hand drill to drill out the gear, brand new drill bit, I could not keep it from walking into the aluminum. I had to stop, and go use the neighbors drill press. Made a world of difference. I ended up drilling a little deeper than the manual said so I could get a good tap after my ugly start with the hand drill.
When you re-install the pump, check your backlash with the crankshaft gear, you probably will need to change the number of shims that was between the pump and bearing. Hope that helps.

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