What is this extra hose for on my 990?

[robpm]

sjhulsmn, When you disconnect your 8B bh from your JD1070 do you then connect the hose that is free into connection on the left? That is the only place that mine could connect because the other connection is different.

 

[Furu]

The loose hose should have a male QD. When the BH is disconnected you MUST connect this male QD to the female QD that the BH supply line is currently hooked to. The BH return line probably has a female QD and connects directly to a male QD on the lower right of the tractor. When the BH is disconnected that male QD on the lower right should have a dust cap and be left alone.

 

[robpm]

That makes sense because there is a dust cap for the lower right where the return is.

Now that I am learning a little bit more on this machine I have a more crucial question. when I first ran the bh to test it out the bh came off the back of the tractor. I learned that the 2 pins underneath were not locked. No big deal I then learned how to hook it back up and everything worked well. However I did disconnect the bh from the hydraulics because I had to pull the tractor out and reback it in. I did not connect that hose because I had no clue at the time. I probably ran the tractor for 1 or 2 minutes at most before shutting it off and reconnecting. Do you think that I did damage to the pump and if so how much?

the hydraulics on the bh still work and also on the fel. but of course that means nothing in one sense. I still could have done damage and not known it.

 

[AKfish]

That makes sense because there is a dust cap for the lower right where the return is.

Now that I am learning a little bit more on this machine I have a more crucial question. when I first ran the bh to test it out the bh came off the back of the tractor. I learned that the 2 pins underneath were not locked. No big deal I then learned how to hook it back up and everything worked well. However I did disconnect the bh from the hydraulics because I had to pull the tractor out and reback it in. I did not connect that hose because I had no clue at the time. I probably ran the tractor for 1 or 2 minutes at most before shutting it off and reconnecting. Do you think that I did damage to the pump and if so how much?

the hydraulics on the bh still work and also on the fel. but of course that means nothing in one sense. I still could have done damage and not known it.

That short of a time - not a big deal, likely. You can get things "heated" up fairly quick, though... The tractor pump will be "talkin" to ya; when it's disconnected!

AKfish

 

[robpm]

AKfish, thanks. I heard nothing that sounded strange at the time. I'm trusting that I did no damage.

The other thing was that the hydraulic fluid level was below the add on the dip stick. It had not been changed in 6 years and it was not changed at the 50 hr point as the manual says. 2 days ago I drained it (I also drained the motor oil and changed the filter etc), changed the filter, cleaned the suction screen and added 5.5 gallons of the low viscosity Hy-Gaurd (not cheep stuff but I found a place on line with the best price, the local dealer was twice as much). before draining it I made sure that all the cylinders including the bh, which was still connected were completely retracted in order to make sure as much of the oil was in the tractor as possible. Even then it was still below the dip stick when cold. I have added the 5.5 gallons but now it shows up that I have to add on the dipstick. I am guessing that with the bh connected that that takes some oil to fill the lines, valves and cylinders so that is where I will need to add a little extra to get it to the operating range. Also if it was that low would it make it so it did not have as much power as I assume it would have? My fathers old IH 330 utility's hydraulics always seemed to lose power and go slow when the hydraulic fluid was low.

 

[sjhulsmn]

Trovenn explained the connections perfectly. My 8B owners manual shows the connections to work just as Trovenn stated. I'm guessing my power beyond plumbing must have been John Deere's standard at that time since that's what my manual shows. My tractor is a 1997 model,

 

[robpm]

Thank you all for your help. In addition I have been reading a lot of different posts on Power Beyond. I now understand that PB is a continuous flow and that if nothing is hooked up to it that the hose that is free on my 990 that is labeled "from remote valve" (see pictures) needs to be connected to the Quick Connect labeled "to remote valve". The 3rd connection from what I can understand dumps directly into the rockshaft case. I have attached a schematic from JD's part site. My understanding on this may not be correct but with the 8B bh connected as it is right now to the 3rd connection, that the Rockshaft will not raise or lower. I have not been able to test this yet myself. However if I were to connect the bh to the 2 connections labeled "from" & "to remote valve" that the bh would still work and that also my Rockshaft would work as well. The other note is that you don't hook it up that way because you don't want the rockshaft to operate with the bh connected although the arms to the rockshaft are completely removed (as there is no way you could have the bh connected and have the arms attached) so even if it did work it would not cause any harm. One person noted that they wanted to use the PB with their wood splitter which was a 3 point hitch so they needed the rockshaft to work in order to lift it up and down so they connected the wood splitter to to the "from" & "to remote valve" connections and not to the 3rd connection like the bh is connected to and then the rockshaft worked.

Does this all make sense and would you say that my understanding is correct on my "new" "used" 990?

I did get a wood splitter with this tractor as well for a 3 point hitch and the owner only used it with the bh attached and just connected the hoses with the qc right into the same connections as the bh with the bh hoses disconnected. I tried that out by hooking it up before I changed the hydraulic/transmission oil and the valve worked in a reverse order so I am guessing the flow was opposite what it should have been and if I swapped the qc on the hoses that it would work the way that it should. Any comments on that would be appreciated. This is a SpeeCo splitter with 3 point hitch and it sits up off the ground. Tractor Supply Center's sell these.

Thanks again for everyones insight and help on this.

 

[Zebrafive]

Doubt any damage, relief valve for pump may have opened and prevented damage.

Interested in what you find on the rackshaft operation, vs how splitter is connected. Same as BH or with PB connectors.

 

[Furu]

That makes sense because there is a dust cap for the lower right where the return is.

Now that I am learning a little bit more on this machine I have a more crucial question. when I first ran the bh to test it out the bh came off the back of the tractor. I learned that the 2 pins underneath were not locked. No big deal I then learned how to hook it back up and everything worked well. However I did disconnect the bh from the hydraulics because I had to pull the tractor out and reback it in. I did not connect that hose because I had no clue at the time. I probably ran the tractor for 1 or 2 minutes at most before shutting it off and reconnecting. Do you think that I did damage to the pump and if so how much?

the hydraulics on the bh still work and also on the fel. but of course that means nothing in one sense. I still could have done damage and not known it.

For that short of time you should be OK and I doubt that any real damage occurred but try not to repeat.

 

[jwinner]

I didn't realize that the three port setup was something standard.

I had the PB kit added by the dealer to my 4005, but I don't have a backhoe. I was figuring either to add a backhoe at some point, or convert my log splitter to use the tractor hydraulics. So I haven't ever used the thing yet, but I just have the two ports, not the three. JD must have decided it didn't matter if the rockshaft was able to operate or not - or maybe they just wanted to save money.