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Post by OptimallyDismal on Feb 20, 2022 11:36:05 GMT -6
I have one of the last red 846's so it is an '89.
I am not a hydraulic expert so somewhat scared of messing things up.
This year I put it on the air seeder with a 3195 cart, everything seemed fine, then the fan speed would drop out and get random, sometimes it would cycle, dropping out and then recovering, sometimes not, then it would work fine the rest of the day.
I got the dealership out and the flow and pressure was fine when it worked, then it would drop out. They changed the hydraulic connectors to the pointy tips saying that would fix everything up, they were wrong.
I think the controller on the pump is the problem.
The pump is probably a Vickers, it looks like it has 2 sections, with the back section having the controller on it, and the steering pump mounted on the end.
Question is can I just remove the controller or do I have to take the whole pump off?
Hopefully someone on here has more insight than I do on this (hopefully) little job.
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Post by grainline on Feb 20, 2022 11:50:06 GMT -6
The controller have 4 allen head screws on it ? Is so yes you can just take it off the load sense spool is likly sticky some times you can free them up with emery cloth.
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Post by OptimallyDismal on Feb 20, 2022 11:54:46 GMT -6
Yes it does, it is hard to get to, so I want to be sure there won't be springs or something flying out!
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Post by meskie on Feb 20, 2022 12:22:12 GMT -6
Where does the load sense line come from on that system? Be a good idea to make sure it hasn’t been damaged. But it sounds like the spool is sticking to me.
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Post by OptimallyDismal on Feb 20, 2022 12:37:53 GMT -6
Good point, I will have to check that, I don't have any leaks though. It is under a lot of snow right now!
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cropgrower
Full Member
location western manitoba
Posts: 119
Likes: 139
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Post by cropgrower on Feb 20, 2022 12:46:11 GMT -6
i have a 976 and it got very slow lifting drill at headland , fan never slows down , always used front lever to lift but it got very slow , changed pipes to another valve and it lifts perfect , anybody know why one valve would be weak ? thanks
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Post by Oatking on Feb 20, 2022 14:02:35 GMT -6
CROP grower I noticed that on my 946 versi. I also changed to a different hydraulic stack valve and it worked fine. Then I went back to it later and the other one worked fine. I thought I had an air lock in it.
In regards to the hydraulic pump , OP DISMALL do you have any hydraulic oil leakage back into your engine oil? On my 1990 blue 946 I had a seal go on the hydraulic pump and it would unload almost all the hydraulic oil into the crank case oil. My oil level was pushing out of the engine oil dipstick. My local mechanic installed a new hydraulic pump and that solved the the problem. At first I TRIED JUST THE OIL SEAL BUT that didnt last very long. I think there is a lot of wear on those components and maybe best to replace the pump so you know what you got come seeding time. I forget what the pump cost but it was not outrageous.
My pump failed while we were doing scrappering.
I know I will have to do some work to the transmission on my 946. OPdismal , have you ever had your oil transmission light come on when it is hot outside and you slow down to turn. Normal it usually comes on when you press the clutch but I noticed last year it came on when the tractor was moving and while the tractor was close to 1200rpm. I have changed oil filters and cleaned the suction filter in the tranny. Any thoughts would really be appreciative.
What could the problem be? Is it the oil pump in the front of the transmission? My 946 has 13500 hours and it is a absolute workhorse. This tractor I will keep till I retire .
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Post by OptimallyDismal on Feb 20, 2022 17:35:00 GMT -6
No oil leaking into the engine, mine is the L10 cummins with a 12speed manual tx, only time the tx light comes on is when the clutch is pressed (so far) but it seems to come on sooner than it used to. It has 10,000+ hours so I think the clutch and maybe tranny is getting tired and will be another project, I will have to watch that light closer maybe. I think we may have the same tx, I was hoping mine would last forever at the lower power application. My floor shifter is a bit obnoxious, tried to redo the linkages, but not the improvement I was hoping for.
I hear it is fairly easy to take the tx out with the lifting frame and a chain fall?
Is that an 855 in that 946? 1200 is way low revs in my Freightliner with an 855, I try not to go below 1900 in it.
I changed the filters as well and the old ones really were not bad looking.
Did you get the pump from the dealer? They were supposed to be looking up the control but seem to have trouble finding anything about it.
The manuals are not very helpful either, it says to replace the control if it isn't working, so it sounds easy peasy (might be a trap though).
Side note, when I got it there was a major short in the lights, turns out the wiring harness rubbed on the frame on the left side of the engine, had to repair 5 wires, lucky it didn't burn up actually, might be something to check out on similar models!
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Post by OptimallyDismal on Feb 20, 2022 17:36:56 GMT -6
i have a 976 and it got very slow lifting drill at headland , fan never slows down , always used front lever to lift but it got very slow , changed pipes to another valve and it lifts perfect , anybody know why one valve would be weak ? thanks Each valve has those adjusters on the valve block on mine, could one be turned down? |
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cropgrower
Full Member
location western manitoba
Posts: 119
Likes: 139
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Post by cropgrower on Feb 20, 2022 18:04:01 GMT -6
i have a 976 and it got very slow lifting drill at headland , fan never slows down , always used front lever to lift but it got very slow , changed pipes to another valve and it lifts perfect , anybody know why one valve would be weak ? thanks Each valve has those adjusters on the valve block on mine, could one be turned down? that is possible ,i newer touched them , it was always slow on that lever , last year i got a bigger drill and it was a lot slower , just changed to another valve and it worked fine , must have a look at it |
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Post by Oatking on Feb 20, 2022 19:00:08 GMT -6
I meant to say When I idle down to 1200 rpm the light comes on only when the trans oil is very warm usually during afternoon days when outside temps are 27-30c. When I throttle back up to 1800rpm the light on the dash goes out.
I will look back in my books. I got the hydraulic pump installed in the fall of 2017 or 2018. Not sure what the core is worth.
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Post by OptimallyDismal on Feb 20, 2022 19:48:43 GMT -6
Hmmm, I am trying to recall if it is starting to flicker a bit on deceleration, it is hard to remember what a hot day was like😊
I have learned not to put my hand on a hot transmission in the summer for sure!
I have the Jensales repair manuals, I'll have to look see what they have for info on the transmissions.
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Post by billybigrigs on Feb 20, 2022 20:37:20 GMT -6
As far as the trans light goes, first clean the suction screen on the trans lube pump.
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Post by SWMan on Feb 20, 2022 22:27:47 GMT -6
Cool to see guys helping eachother like this.  Going back a ways and my memory is a bit fuzzy, but when I had a 876 I seem to recall the pins in the cable ends wearing and maybe the lever bottoms out before the circuit is fully activated? If so this would be more of an issue on remote #1 because of high use. On mine(1988 model) there were flow knobs on the valve stack except the forth one had a dial in the cab which often was sticky. Great tractors, wish they still made them that simple. |
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Post by OptimallyDismal on Feb 21, 2022 9:15:48 GMT -6
You are right on, I put the fan on #4 with the fantasy of adjusting from the cab, even though the cable moves I still am moving the stack end by hand, good thing it isn't changed very often.
The hydraulic levers on mine are very stiff too.
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