8430 hydraulic noise in steering circuit help - video

cact34r

Member
Can anyone help me identify what this noise and action indicates? I ran this tractor today for a few hours disking so I don't think it's air in the system. The clutch pressure is steady and the remotes work smoothly once they cycle a few times. Transmission hi-lo shifts smoothly. When I push down on the steering wheel sitting in park and idling it does this. The frequency is dependent at RPM, but at higher RPMs (over 1500) the steering wheel really can't be pushed down and the noise is lighter. I just got the tractor and replaced the clutch and have changed both hydraulic filters. The hose shown shakes with the same pulse. You can also see the line on the hydraulic oil cooler shaking the same way. Thank you in advance, I hope this is my last question about this tractor for a while - it's my first deere which is great but I don't have any experience with them.



[video play=false:456c93e306]https://forums.yesterdaystractors.com/videos/mvvideo61731.mov[/video:456c93e306]

[video play=false:456c93e306]https://forums.yesterdaystractors.com/videos/mvvideo61734.mov[/video:456c93e306]
 
(quoted from post at 21:34:21 09/12/20) Failed inlet valve in main hydraulic pump, perhaps?

Is that the same thing or part of the destroy valve that can turned out on the bottom of the pump?
 
I had an 8630 that did that,, we would notice it when we would take a short power nap,,long hours were wearing us and the tractors out back then..so this went on for about a year and I couldn't understand what was causing it..then the shaft seal on the front pump started to leak, when I tore it down and inspected it I found 1 inlet valve seat chipped, I replaced it and resealed the pump,,after that I noticed that the pulsing sound went away...my thoughts were that some low pressure was pulsing back through the return circuit..but I was never sure,,but that fixed that one..It's a big job just to check that theory out..
 
(quoted from post at 06:38:51 09/13/20) I had an 8630 that did that,, we would notice it when we would take a short power nap,,long hours were wearing us and the tractors out back then..so this went on for about a year and I couldn't understand what was causing it..then the shaft seal on the front pump started to leak, when I tore it down and inspected it I found 1 inlet valve seat chipped, I replaced it and resealed the pump,,after that I noticed that the pulsing sound went away...my thoughts were that some low pressure was pulsing back through the return circuit..but I was never sure,,but that fixed that one..It's a big job just to check that theory out..

I am familiar with the power nap in both the tractor and the combine. A gleaner steering wheel doesn't make the worst pillow.

I'm going to pull the destroke valve this afternoon to clean and make sure the spring isn't broken. Then just keep watching the pump for what you describe.
 
I think it would be a waste of time to pull the stroke valve out,,and that would be a nasty job to boot,,,a 30 series pump can be pulled out the bottom with out removing the radiator,,if the tractor has a lot of hours on it,,and you want to keep it dependable ,,I would consider a new pump in the future...I know I just spoke of about $2,000...but it is an important part. Years ago my Dad had a pump lock up and broke the coupler shaft on an 8640,as he was going down the road,,he was wiggling the steering as he was trying to control it,,unfortunately a neighbor was passing him at that time with a near new Crown Vick Ford,,he didn't even notice her at the time..well the story ended up with him making a new gate into a field,,and the chisel plow he was towing ripped all the chrome and door latches off the passenger side of the car...
 
(quoted from post at 10:31:57 09/13/20)



I'm going to pull the destroke valve this afternoon to clean and make sure the spring isn't broken. Then just keep watching the pump for what you describe.

The correct terminology for valve that adjusts hyd stand-by pressure that comes out the bottom of frt hyd pump is "stroke control valve"(keys 31-39). Destroking screw(key 6 or 15) is accessed at the top of the hyd pump

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Ouch - sorry to hear about that but glad that's 'all' that happened. It can imagine how much worse it could have been. Yes, I want to keep it dependable. We don't do a lot of acres but it will be an important part of the operation next year. When I bought the tractor in July my plan was to get the clutch fixed and use it for wheat ground now so that I could see what else it needed so I could fix over the winter.

What makes pulling the stroke control out such a nasty job? I was thinking maybe something fell into the suction tube when I had it disconnected under the cab when I split it. It looks like it's right there underneath - does all the oil pour out?
 
As I said (and TimS agreed with) the problem likely is with one (or more) of the intake valves (Key #21) and/or seat(s), key # 17. There's 8 of them and they are accessed after removing the from cover of the pump (that contains the pressure control/stroke control valves).

<img src = "https://i.imgur.com/IsMmHUI.jpg">
 
It is near impossible to make any repairs on the pump while it is in the tractor,,and I am near sure the stroke valve is not the issue here...they are a cool tractor,,but they can get deep into your pocket when they need repairs,,I use to Baby sit about 50 of them back in the old days, 86's and 84's......
 

Ok I get it - I will plan to replace the pump over winter just to be sure. Thanks and I can't tell you how grateful I am for your experience and your willingness to share it. Based on where it came from and how it was used there, and how I plan to use it, it should last a long time.
 

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