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JD 4020 Hydraulic Pump

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Phil

07-02-2002 12:44:34




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I think my hydraulic pump went out on me yesterday. I was raking hay and I heard a screaching sound and I lost my power steering, power brakes, and my remotes. I shut it off real quick before I figures out what it was but does this sound like the pump. I tried to check the fluid level but since I was on the side of a small hill the dip stick wouldn't read but it was OK a few days ago. The tractor (PS trans) would still move so I'm sure there is plenty of fluid.

What is involved in removing/fixing a hydraulic pump? Is it in front of the engine, do I get to it by removing the side panels or can I get to it from below.

I haven't looked at it yet, I needed to get the hay in so my neighbor came over and we used his tractor and now I'm going to see what I need to do to fix mine. Any advice/pointers would be greatly appreciated. It is a 1965 JD 4020D with PS transmission. Thanks.

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Ricky

06-15-2004 17:40:52




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 Re: JD 4020 Hydraulic Pump in reply to Phil, 07-02-2002 12:44:34  
I am going friday to look at 68 model 4020 in excellant condition . what I need to know is what I need to look for . Any faults that you all know of anything that could help me buying this tractor ? I have always wanted a wanted a 4020 .



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Dan

07-02-2002 21:15:42




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 Re: JD 4020 Hydraulic Pump in reply to Phil, 07-02-2002 12:44:34  
I worked on this series of tractors for several years for a dealer. If you do have to take the pump out, as was said below if a wide front it has to move out from under the tractor so the pump can go out the bottom. We had a cabel hooked to a screw in fitting that went in one of the piston cover holes I believe so you could lower it out and raise it back up when done. I would think it is more apt to be coupler than pump also.

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Jiff

07-02-2002 19:26:12




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 Re: JD 4020 Hydraulic Pump in reply to Phil, 07-02-2002 12:44:34  
Check the coupler between the pulley and pump drive shaft.



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Phil

07-03-2002 14:25:40




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 Re: Re: JD 4020 Hydraulic Pump in reply to Jiff, 07-02-2002 19:26:12  
What would be wrong with the coupler? It is still connected and turning, is there anything else to check? I changed the filter and it didn't help, it is still making the noise and there is no hydraulics.



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Jiff

07-03-2002 18:29:09




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 Re: Re: Re: JD 4020 Hydraulic Pump in reply to Phil, 07-03-2002 14:25:40  
It could well be the splines on the coupler pump drive and on the pump itself are gone. Sometimes if you are lucky, replacing the pump drive half will get you by for a while. But eventually you are going to have to go through the pump.



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Phil

07-03-2002 18:50:22




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 Re: Re: Re: Re: JD 4020 Hydraulic Pump in reply to Jiff, 07-03-2002 18:29:09  
I took the coupler off and the splines on it are shot. The splines on the pump look good and the pump was free, I was able to turn it so it didn't lock up. Hopefully I can get a new coupler and that will take care of it. Thanks.



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Larry Ks.

07-02-2002 18:00:44




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 Re: JD 4020 Hydraulic Pump in reply to Phil, 07-02-2002 12:44:34  
I had a similiar experience with my 4020....turned out all I had to do was change the hydraulic filter and it was fine. It was weird, I had been using the tractor and everything was fine, and then I started it up to go mow hay and it was making the same kind of sound you describe, I thought the pump had gone bad to.....luckily I had a new filter on hand, and changing it fixed everything. I took a hacksaw and opened up the filter, expecting to find cutting from the rear end or lord only knows what....I really didn't find any cutting, looked like dirt, some yellowish paint, etc. I had changed the filter a couple of years before.....I made a firm resolution to myself to change it YEARLY...from now on!!

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DON

07-02-2002 14:22:39




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 Re: JD 4020 Hydraulic Pump in reply to Phil, 07-02-2002 12:44:34  
The hyd pump is in front of the engine and comes out the bottom. If you have a wide front it has to come off. I doub't that you hurt the pump due to lack of oil if you shut it down right away. fill it up with oil and see what happens.I cant explane the screech unless the bearings in the pump froze but I doubt that.Don



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