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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum

Water Pump w/Cast Pulley

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07-10-2019 11:53:34

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I hope you can help me. I have an Oliver 770 tractor gas engine. The water pump leaks like a sieve and needs replacement.
Working with a local ag dealer, I purchased a new water pump that otherwise fits, however, after removing the old pump from the tractor, I realized the old pump has a casting with the pulley and fan mount flange as a single piece. The new pump had a plain flange to mount the fan blade but no pulley. All the Oliver pumps I could find also have a plain flange and require a separate pulley. I returned the new pump to the ag dealer who help me with a pulley and took the pump back. At this point, I can either repurchase the water pump and try to source the proper pulley, or try to rebuild the old pump or hopefully have you provide me with a solution.

Attached are pictures of the tractor ID plate, the hub and pump and a drawing of the required geometry of the pump/pulley. Tractor model looks like 37-1946 and serial # 134-729-721.

The water pump has 5 flat head screws attaching the back plate, with one screw small than the other 4. Pump has a casting # 190360

I have pics and a pretty good drawing of what I need - not sure if I can attach.


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07-12-2019 07:23:14

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 Re: Water Pump w/Cast Pulley in reply to promech, 07-10-2019 11:53:34  
Thanks to all for your input. I'm going to go ahead and get the pump I originally bought and install the cast hub on it. I just want to be as sure as I can that I will get a good press. Other concern is getting the pulley to line up with the crank pulley and generator. This way I can get that perfect. Plus, for the cost of the pump I can avoid the potential can of worms involved with rebuilding, which looks to me like a bargain.
Thanks again for your interest and input. Think I will be spending more time at this site..

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07-11-2019 08:43:37

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 Re: Water Pump w/Cast Pulley in reply to promech, 07-10-2019 11:53:34  
I'd just get the new pump you had, compare the shafts and if all else is the same, press the flange off and press the pulley on. Yes they can be a hard press.

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J. Schwiebert

07-12-2019 04:59:00

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 Re: Water Pump w/Cast Pulley in reply to scootergmc, 07-11-2019 08:43:37  
You have a later water pump. The new pump you received may have a different distance from the center of the crankshaft to the center of the water pump. What is the part number/casting number for the pump you purchased?

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07-11-2019 05:37:36

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 Re: Water Pump w/Cast Pulley in reply to promech, 07-10-2019 11:53:34  
Try Kellog Automotive in Az, Online catalog and you can buy the parts or he can rebuild it for you. I rebuilt my 1550 pump that way. The hard part was getting the pulley off. I can post pictures of my setup if you want.

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07-10-2019 15:08:22

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 Re: Water Pump w/Cast Pulley in reply to promech, 07-10-2019 11:53:34  
If you would like to have your pump rebuilt or purchase a kit, send me an email.

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07-10-2019 14:39:13

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 Re: Water Pump w/Cast Pulley in reply to promech, 07-10-2019 11:53:34  
Thanks J

I did not include a picture of the pulley I have. The old pump has a .627 dia shaft and the hub presses on pretty hard. DO you now if the other pumps have a similar shaft dia? If so, its starting to look like my best option is to buy back the pump I had, remove the new hub and press on the old one. What do you think?

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J. Schwiebert

07-10-2019 12:45:01

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 Re: Water Pump w/Cast Pulley in reply to promech, 07-10-2019 11:53:34  
The new pump you purchased is for an older 770. Going by memory here but I think there were at least 3 different 770 water pumps. Do you have access to a press? You need to get the right pump or rebuild yours. Questions? My e-mail should be open. j.

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