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John Deere Tractors Discussion Forum
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4430 Front Hydraulic Pump

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johnyquest69

02-20-2017 17:07:12




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Trying to fix some oil leaks on 4430. Took pump off and carried to mechanic for reseal. Still leaking. I think around shaft. Cheaper to by a rebuilt pump rather than possible shaft? Mechanic said he thought shaft would work ok but only possible cause. Any special seals Tim?




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johnyquest69

02-27-2017 13:30:57




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 Re: 4430 Front Hydraulic Pump in reply to johnyquest69, 02-20-2017 17:07:12  
I took the oil seepage line off of back of tractor today and had no oil. Blew line out to make sure it was clear. I took it off at pump and had no oil coming out there either. Is it possible seal was driven in too far? Should I see oil flowing from this line? Thanks!



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DustinWright

02-27-2017 17:29:36




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 Re: 4430 Front Hydraulic Pump in reply to johnyquest69, 02-27-2017 13:30:57  
Im not an expert but Did rebuild my pump on our 4430 last year due to the shaft seal leaking. The seepage line is between the internal seal and the outer dust seal. If it starts leaking a little it will direct the oil back into the tractor. If your seal isnt leaking i think that would be a good thing.
Hope this helps



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johnyquest69

02-22-2017 03:04:03




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 Re: 4430 Front Hydraulic Pump in reply to johnyquest69, 02-20-2017 17:07:12  
I was thinking I was going to be at rebuilt pump cost by the time I put much more $ in. Best I can tell it is around shaft. Hard to tell laying on back looking up under there. Not much room to see. Pretty substantial oil leak though. I dropped it out bottom last time because I replaced water pump pulley and pulled radiator and flushed. Not a problem out the top? I have a 148 loader bracket mounted to tractor, but the loader portion is off. Unbolt from mounting bracket and she will come out ok? Does radiator have to be drained and moved? TIA!

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Tim S

02-22-2017 04:57:39




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 Re: 4430 Front Hydraulic Pump in reply to johnyquest69, 02-22-2017 03:04:03  
Pull the radiator and take it out the top...you can do it with the radiator in,, but you have a lot more access with it out..



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M w J

02-20-2017 21:30:33




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 Re: 4430 Front Hydraulic Pump in reply to johnyquest69, 02-20-2017 17:07:12  
Is it dripping or spraying I had a leak on my 4440 I thought was the pump. It was spraying a very small stream. But when I held a piece of cardboard in front of the stream It wasn't coming from the pump it was a powersteering line . It was spraying to the front of the pump .



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Tim S

02-20-2017 18:49:28




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 Re: 4430 Front Hydraulic Pump in reply to johnyquest69, 02-20-2017 17:07:12  
I agree with Cliffs except I think going with a new after market pump when the shafts is worn, by the time you change the shaft,bearings,seal kit and stroke valve you are new the replacement cost,and you at replacement price



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Cliff Nelson

02-20-2017 17:53:39




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 Re: 4430 Front Hydraulic Pump in reply to johnyquest69, 02-20-2017 17:07:12  
Make sure he only drove the shaft seal in far enough to install the snap ring. If you bottom out the seal, it blocks the drain passage and forces the oil out past the outer seal. I found that on one last fall that customer had bought a rebuilt pump and installed. New seal installed properly fixed it. I almost always replace the shaft due to wear in the seal area and yes, it is cheaper than a rebuilt pump. Only time I replace a complete pump is if the piston bores are scored or the inlet valves are worn out.

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johnyquest69

02-20-2017 17:22:59




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 Re: 4430 Front Hydraulic Pump in reply to johnyquest69, 02-20-2017 17:07:12  
Supposedly the kit plus the one around shaft. I need to check what you are talking about. Need to buy a manual. I will see I can find what you are referring to on parts diagram. Thanks!



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buickanddeere

02-20-2017 17:18:37




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 Re: 4430 Front Hydraulic Pump in reply to johnyquest69, 02-20-2017 17:07:12  
How many seals did he replace? Is the oil seepage line free flowing all the way back to the transmission case ?



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