JD 970 wet brake issue: John Deere Review  -- John Deere Tractors Discussion Forum and Review JD 970 wet brake issue: John Deere Review -- John Deere Tractors Discussion Forum

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 03-28-2012, 09:15 Post: 182913
lutherblue



Join Date: Mar 2012
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 JD 970 wet brake issue

I recenlty purchased a 970 (1991 2WD)that had been neglected for years. I've spent 10 hrs cleaning rats nests and "mess" from the engine compartment and running new wire that the little beggers chewed up - changed oil and filter and she started right up!
Now the bigger problem. Brakes are locked up and sound horrible - also hydrolics are not operable (no steering or three point function) the fluid looks like cofee with too much cream.
I obviously need to replace brakes and will attempt to do this myself. I've ordered a tech manual, but would welcome advice from others who have done this. Such as: what else, other than filters and fluid and brakes, should I address during this process?






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 03-28-2012, 09:20 Post: 182914
lutherblue



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 JD 970 wet brake issue

I found this 2002 post from, JD110_1963:

"Actually the 870,970,and 1070 switched to wet disk brakes. Normally these brakes can be expected to last a very long time. I don't recall ever replacing any since 70 series came out. I would suspect contaminated transmission fluid or improper type of fluid. Wet brakes(and clutches) require fluid that has friction modifiers built in for smooth operation of clutches and brakes. I would recommend changing the fluid and filter. While you are at it, remove the sump screen and see if there is any brake lining material on the screen. If the fluid is contaminated with water or other incorrect fluids, you may need to change the fluid twice to get rid of all contaminants. If you do happen to find brake material on the screen, the final drives need to be removed to access the brakes. There are three brake disks per side and the disks cost around $75 - 80 each. ther are also separator plates that may need replacing at around $40 each. Good luck!"

great info. would welcome other comments/advice.







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 03-28-2012, 14:32 Post: 182916
lutherblue



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 JD 970 wet brake issue

Wow, it's like I'm conversing with myself here Wink yeah right
thought id update - spoke with a mechanic at a JD dealership. He said the problem is likely not with the brakes (tractor has only 953 hrs), but dirt and crud where the linkage goes into the housing. this, of course, would not allow the brakes to fully release. ?






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 04-01-2012, 22:06 Post: 182957
jdgreen



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 JD 970 wet brake issue

Do the brake pedals release after you press them down? If not, then you may have frozen linkage. That still does not explain the no hydraulics issue. A sump screen plugged with brake material or other debris would. Have you removed the sump screen yet? If not, I would recommend removing it and cleaning it. Also replace the filter and transmission fluid. Then see if the hydraulics come back to life.






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 04-02-2012, 15:36 Post: 182967
kthompson



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 JD 970 wet brake issue

Fluid that looks like too much cream makes me think you have water in it. First need to find the soucre of the water (no idea on JD but being parked in rain for long time may have allowed rain into to system) change the fluid and filters. Then hope a filter was not letting the fluid pass through it do to water damage.

Yes pedals should return when you release foot pressure which would make me think JD mechanic is correct. On my Kubotas I keep spraying such points where linkage connects and enters transmission.






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 04-04-2012, 12:17 Post: 182990
lutherblue



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 JD 970 wet brake issue

Thanks for the comments.
Update is...
After disconnecting the linkage on the brakes and knocking them around a little and using penetrating oil - i then changed the hydro fluid, cleaned the screen (no brake particles, but plenty of what looked like congealed latex) and changing the filter there was good function with both brakes and three point.
i still have some "whining" with the steering, but power steering is back also. i will do another hydro change / screen cleaning soon (i think this should clear any remaining water from the system).
One issue remains - I have one wire I cannot trace. It is the one splitting off the main wiring harness as it comes from the engine compartment back through the firewall. It is the only single wire splitting off the harness and is red with a bright blue stripe. i cannot find where that little bugger is supposed to go. Does anyone have a 970 that could look at their tractor and give me some help?






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 04-04-2012, 12:24 Post: 182991
lutherblue



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 JD 970 wet brake issue

The wire issue.
i should mention, the wire was also (prior to the rat chewing it up) encased in a black sleeve. I'll try to post a picture.






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 04-04-2012, 13:20 Post: 182994
lutherblue



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 JD 970 wet brake issue

here is a picture of the wire in question...





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John Deere Review: JD-970-wet-brake-issue

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 04-04-2012, 13:25 Post: 182995
lutherblue



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 JD 970 wet brake issue

try again?





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John Deere Review: JD-970-wet-brake-issue

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 04-04-2012, 13:31 Post: 182996
lutherblue



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 JD 970 wet brake issue

what is pictured:
the bracket is what holds the fuse box, which has been removed. The wire in question is the one in the upper left portion of that area - you can see it just ends. i cannot find where it should connect. it was shrouded in that black casing, but the wire inside the shroud is red with a blue stripe.






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