Jd500a noise when engaging motor connect lever
1 - 20 of 21 Posts
Joined
·
706 Posts
May I ask what pulley & brgs you're referring to??
Sounds like the trans or clutch area
Seems like the center by the dry clutch, and goes away when any of the hydraulics are used and comes back when the hydraulics are at rest.
Noise is still there when moving, moves fine
Joined
·
75 Posts
Here is a possible cause of the noise. To those who are around John Deeres a lot the noise of the closed center hydraulics on a tractor like yours becomes less noticeable or in other words you can become used to it. It is a noise that is somewhat prevalent especially to those who have not become accustomed to it. And it is common for the noise to quiet when the hydraulics are in use. What happens when you engage the motor connect lever the transmission pump engages which pumps fluid up to the main front pump. So when it starts pumping the noise begins. Not a 100 percent JD guy but I believe in some cases there is some type of adjustment to the hydraulics that may be made to lessen the “standby” noise.
Joined
·
75 Posts
They were used on the first power shift models, (20 series) The idea was that for starting in very cold climates you could disconnect the transmission so it would not drag on the starter. A synchro range transmission will stop turning the transmission when you push the clutch. I might be corrected but his tractor is basically an industrial model 3020. I believe it has the same Powershift transmission as a 3020 except it has a reverser lever. In the link is the lever you want to see, if you click the left arrow in the box it will show you the internal clutch parts.
To the OP you got an example of what I am talking about that Deere guys get used to that noise. He is right there should be no pumping if no oil is used but there must be some. Not sure if it may be the power steering that’s does it. A buddy of mine run a dairy and had four 4020 PS tractors they all made the noise to a certain extent. It is kind of a knocking slightly grinding noise. Just turning the steering wheel a bit would quiet it some.
JD 500A online parts catalog
To the OP you got an example of what I am talking about that Deere guys get used to that noise. He is right there should be no pumping if no oil is used but there must be some. Not sure if it may be the power steering that’s does it. A buddy of mine run a dairy and had four 4020 PS tractors they all made the noise to a certain extent. It is kind of a knocking slightly grinding noise. Just turning the steering wheel a bit would quiet it some.
JD 500A online parts catalog
Didn't see where the OP said this was a powershift -- or are all 500A powershift ?
Had several Deere apart, but not this model
Does sound like the bushings are shot on the main pump drive
Tranny pump usually does not make noise
if this disconnect works like you guys describe, than the tranny pump will not be turning with it in disconnect position
so, ...the main pump will not be pumping any oil
Had several Deere apart, but not this model
Does sound like the bushings are shot on the main pump drive
Tranny pump usually does not make noise
if this disconnect works like you guys describe, than the tranny pump will not be turning with it in disconnect position
so, ...the main pump will not be pumping any oil
Joined
·
75 Posts
He has another post about troubles with the transmission.
Joined
·
75 Posts
HT
..”Tranny pump usually does not make noise
if this disconnect works like you guys describe, than the tranny pump will not be turning with it in disconnect position
so, ...the main pump will not be pumping any oil”..
I already said that!
And his post says the noise starts when the transmission is engaged, thus the noise starts when the main front hydraulic pump starts pumping. Also in his other post he said this tractor has a gas engine which makes the noisy hydraulics seem worse yet.
Are you also going to hop on the 10 and 20 series Deeres DO NOT have noisy hydraulic systems band wagon?
I maybe should have said this earlier, but I think the OP is concerned that this noise is the cause of his transmission woes. I believe it is just the normal racket they make. Granted the closed center system was light years ahead of other brands when it came out and works well. I do not know how this fits in but his tractor probably has a higher GPM pump being a backhoe.
..”Tranny pump usually does not make noise
if this disconnect works like you guys describe, than the tranny pump will not be turning with it in disconnect position
so, ...the main pump will not be pumping any oil”..
I already said that!
And his post says the noise starts when the transmission is engaged, thus the noise starts when the main front hydraulic pump starts pumping. Also in his other post he said this tractor has a gas engine which makes the noisy hydraulics seem worse yet.
Are you also going to hop on the 10 and 20 series Deeres DO NOT have noisy hydraulic systems band wagon?
I maybe should have said this earlier, but I think the OP is concerned that this noise is the cause of his transmission woes. I believe it is just the normal racket they make. Granted the closed center system was light years ahead of other brands when it came out and works well. I do not know how this fits in but his tractor probably has a higher GPM pump being a backhoe.
Naw, all the older Deeres are noisy
Well i think the front pump might need a rebuild, but at this time i took the shifter valve body apart and cleaned all the spools and reinstalled to see if that would help with the shifting, well i started it and put a pressure gauge on the clutch test port and at the starting it showed about 140psi, then i shifted gears up and down a few times and it went to 30 psi stayed there, now all the hydraulics are not working or chattering and slow. Not sure if its related to taking about the valve or if it was the same issue i had earlier.
Joined
·
75 Posts
I am no expert just going by what I remember from helping a buddy diagnose and repair his tractors. I am pretty sure the front hydraulic pump has very little to do with the pressures in the transmission. That is all from the transmission pump. Which as stated earlier supplies oil to the main hydraulic pump, but also provides pressure for the shifting circuits in the powershift. In your other post about the transmission it says you cleaned the screen, now just because it doesn’t say it there I have to ask, did you also install new filters? How dirty was the screen when you pulled it out? If there was a lot of trash on it, it could’ve actually be plugging up again.
1 - 20 of 21 Posts
