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4020 transmission pump noise?


 
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BT73000
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PostPosted: Sun Oct 23, 2011 8:53 am    Post subject: 4020 transmission pump noise? Reply to specific post Reply with quote

Got something strange going on with my early model 4020 syncro. There is a whine or howling noise that comes and goes from time to time from the area under the seat and platform. It will make this noise at idle and at increase rpm, but will go away if you use a hyd function like the loader or the 3 PT hitch, then return as soon as you stop using the function. All the functions work great and the filter is new, the screen is clean, and the fluid level is correct. Could this sound be the transmission pump? Don't know if it has ever had one replaced, but I assume the tractor has 10K plus hours on it. Or is just a normal sound? Thanks
 
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Tx Jim
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PostPosted: Sun Oct 23, 2011 9:05 am    Post subject: Re: 4020 transmission pump noise? Reply to specific post Reply with quote


It's possible the hyd filter relief valve is leaking.
 
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buickanddeere
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PostPosted: Sun Oct 23, 2011 9:05 am    Post subject: Re: 4020 transmission pump noise? Reply to specific post Reply with quote


Have you put an oil pressure gauge on the test port(s)? To look for an under or over pressure condition.
 
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BT73000
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PostPosted: Sun Oct 23, 2011 9:54 am    Post subject: Re: 4020 transmission pump noise? Reply to specific post Reply with quote

I have not check the pressures yet. I have never done this, but from reading the other post, it seems like I need a 3000 psi gauge and a section of hose. Where do you take the reading from and in what operation; idle w/o clutch depressed, fast idle, pto speed, hot or cold, ect? I have a factory service manual, just haven't ever looked up the procedure. As for the releaf valve, this is the next thing I was going to try. I read an old post where someone had simular issues and replaced this valve, but never said if it cured anything. I do know that if the tractor sits overnight or a couple days, it has to run for about a min or 2 before the loader will operate. I bought the parts last week; the valve, spring, and housing gasket. About $30.00. I assume this valve is located on the left side of the tractor, below the operator station, and the main hyd line that runs to the main pump in the front connects to it.
 
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LarrySTN
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PostPosted: Sun Oct 23, 2011 11:10 am    Post subject: Re: 4020 transmission pump noise? Reply to specific post Reply with quote

Does the noise exist with the 3pt arms down? I"ve repaired 4020's with a bad thermal relief valve and also had some that had noise due to improper 3pt lift valves. If the noise is gone with the 3pt down, dig into the 3pt valves or thermal relief valve. A service manual is of great help with this process.
 
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LarrySTN
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PostPosted: Sun Oct 23, 2011 11:11 am    Post subject: Re: 4020 transmission pump noise? Reply to specific post Reply with quote

By the way do this after you verify system pressure.
 
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buickanddeere
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PostPosted: Sun Oct 23, 2011 1:25 pm    Post subject: Re: 4020 transmission pump noise? Reply to specific post Reply with quote

Checking the transmission oil pressure and flow is a separate but related issue to the front pump flow and pressure.
if the trans oil system isn't working, the front pump never will operate properly.
The lack of front pump operation until the trans pump/system finally supplies some oil proves this.
Check valves, relief valves, pressure control valves and a couple of priority/divert valves.
 
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BT73000
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PostPosted: Sun Oct 23, 2011 5:04 pm    Post subject: Re: 4020 transmission pump noise? Reply to specific post Reply with quote

Thanks for the info. I'll check the system pressures and repost.
 
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Ken11487
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PostPosted: Sun Oct 23, 2011 5:51 pm    Post subject: Re: 4020 transmission pump noise? Reply to specific post Reply with quote

I refurbed the thermal relief valve and the rockshaft control valve housing on my 4320 and it made a fair difference in noise. I'll be interested in how you do with the hid filter relief valve.
The three pt arms wouldn't stay up for more than a few hours and now they only drop 3/8inch in 24 hours. My tractor was slow to pressurize the hydraulic functions and now it is instant.
 
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BT73000
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PostPosted: Mon Oct 24, 2011 1:18 pm    Post subject: Re: 4020 transmission pump noise? Reply to specific post Reply with quote

Looked up some of the parts online. I see a thermo relief valve for a powershift tractor and a HYDRAULIC OIL COOLER BYPASS VALVE for a syncro tractor. Is this the valve I need to look at rebuilding for my syncro tractor and if so what parts do I need. Just the springs and valves or do you have to replace the housing as well? This valve may have a lot to do with my troubles because it seems to make the noise only after its been working and the tractor is hot.
 
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buickanddeere
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PostPosted: Mon Oct 24, 2011 2:24 pm    Post subject: Re: 4020 transmission pump noise? Reply to specific post Reply with quote

When shutdown. The hydraulic oil should not be draining backwards from the cooler, through the pump and emptying all the lines. As the oil flows un-restricted back to the trans sump.
There needs to be a working check valve in the supply line between the transmission and the front pump.
Remember with the clutch pushed down.The trans oil pump does not move oil up to the front pump.
 
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Tx Jim
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PostPosted: Wed Oct 26, 2011 3:00 am    Post subject: Re: 4020 transmission pump noise? Reply to specific post Reply with quote

bt73000 wrote:
(quoted from post at 13:54:56 10/23/11)I do know that if the tractor sits overnight or a couple days, it has to run for about a min or 2 before the loader will operate.


There is a JD service bulletin to add a check valve to correct your tractors lack of hyd psi on start up. Search the archives for a former poster with the handle of "Gerald J" as he had several threads pertaining to your tractors hyd problem.
 
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