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Hydraulic pump leak returns on 300

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Paul 300 U

08-05-2022 16:06:57




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After noticing that my engine oil was rising and my hydraulic fluid levels were dropping I bought a rebuild kit for my hydraulic pump. At the time, in addition to hydraulic fluid getting into the engine it was also leaking out the port where the tach cable inserts beneath the hydraulic pump. After the pump rebuild, the leak from the tach cable stopped and there was no oil leaking into the engine. Fast forward about a year and all of a sudden the leak from the tach cable area has returned with a vengeance. There does not seem to be any oil leaking into the engine.
The oil level on the dip stick has remained steady. Here's my question. Is it possible to stop the leak coming from the tach cable area? I've read that a speedy sleeve or two seals instead together can stop this. Any feedback on whether this will work and how to go about fixing it would be appreciated. This site offers a used pump with a 1 year guarantee. New pumps are well over $600.00. If I can fix it is rather go that route. Thanks in advance for the help! Paul

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MARK ROBKE

08-06-2022 09:30:05




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 Re: Hydraulic pump leak returns on 300 in reply to Paul 300 U, 08-05-2022 16:06:57  
Back in the late'70s, or early '80s, Dad was replacing the pump seal on the 300u a couple of times a year for about 2 years. He ended up replacing the pump with a higher output one, and it has never had a problem since (3500 more hours!). I believe the pump was worn, bushings and probably the body and that caused the seals to fail. Mark.



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Paul 300 U

08-06-2022 13:25:26




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 Re: Hydraulic pump leak returns on 300 in reply to MARK ROBKE, 08-06-2022 09:30:05  
Mark thanks for the reply. You may be correct but Jim's suggestion is inexpensive and worth a try. I've read a few different stories and most indicate the pump is probably shot. I've also read that the 2 seal solutions can work because there's not an extreme amount of pressure. I've got zero expertise here. Do you have any details on the more powerful pump? I'm wondering whether it's less expensive because it's possibly a higher production, more generic type of pump. Thanks Paul

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MARK ROBKE

08-07-2022 14:24:01




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 Re: Hydraulic pump leak returns on 300 in reply to Paul 300 U, 08-06-2022 13:25:26  
Well, I am all for not spending money if I don't have to (my Dad tried to save money replacing the seals at first too). And the 2-seal idea is worth trying-the key being to put lube in between them. He bought his pump at the local dealer at the time, and it was just higher volume as I recall; OEM was maybe (?)8gpm and this one is maybe (?)10 or 12gpm. But I have no idea where to get one-probably have to use whatever aftermarket pump you can find. Good luck, Mark.

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Paul 300 U

08-08-2022 11:14:16




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 Re: Hydraulic pump leak returns on 300 in reply to MARK ROBKE, 08-07-2022 14:24:01  
Thanks for the reply Mark. I'm hoping to get started on this today. My first challenge is making sure I don't screw up the timing. My second is to identify the seals you all are taking about. Third is correctly measuring. Thanks again for the feedback. Paul



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Janicholson

08-05-2022 18:08:18




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 Re: Hydraulic pump leak returns on 300 in reply to Paul 300 U, 08-05-2022 16:06:57  
You can (put it at TDC). Mark the timing at the flange where the distributor mounts with a marks a lot. Remove the distributor and drive to access that end. I think 2 thin seals (not stock ones but same ID/OD) will make it seal. Polish the shaft roundy round not along its length. Pack grease gun grease in the space between the seals. Jim



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Paul 300 U

08-06-2022 13:16:52




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 Re: Hydraulic pump leak returns on 300 in reply to Janicholson, 08-05-2022 18:08:18  
Thanks Jim. I will give that a shot and post the results! Paul



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