john deere 8630 no hydraulics

francis

Member
I have listened to what all had to say and still got no hydraulics all over my tractor,ive put in a new clutch transfer pump under cab,and new drive gear and shaft to drive it too,made sure no valves were sticking in clutch valve housing,and yes theres fluid being sent back into rear housing and not stored in front,pump is working right,
I was at first going to change the rear hydraulic pump or at least check it but too many said it was a waste of time,but what else could be losing the hydraulics all over this tractor?does anyone here know what else to look for in the center hinge area while ive got tractor turned all the way to the right or is there any other test to try?i am getting fluid back to the rear sump too,and rep[laced all of the small orings when I pulled the clutch housing off,no valves are sticking either.reason I had to pull it was to replace drive gear cause of a worn keyway area on shaft and gear as well,thanks,any ideas?
what is the chance it might be the rear pump?
 
Thanks for posting back, as I am very curious as to what the final solution to this problem will, as I'm pretty sure several others are!



I believe you previously posted you have a factory shop manual.

You need to follow the troubleshooting procedures found there and check for flow from the clutch pump, then pressure. If you have flow from the clutch pump but no clutch operating pressure, there is a regulating valve issue, a main clutch operating piston leak to sump, a leak to sump in the planetary 2-speed area, or the PTO clutch or brake area.

The factory manual tells how to isolate each component and figure out where the oil is being lost.

Only when you solve this problem, and get clutch operating pressure, with a flow of oil left over to feed the front, main hydraulic pump will you get hydraulics back.

So first concentrate on getting the clutch operating flow/pressure figured out.

The rearmost pump, near the rear differential (which I initially forgot was even there on an 8630) provides transmission and ring and pinion lube and has NOTHING to do with building clutch operating pressure, followed by feeding oil to the oil cooler and front pump.
 
well bob i got the tech manual,dont show as much as id like but i can try,im thinking of pulling the top gear planetary,then the one behind it if it helps to check orings and stuff i see in that area when i look thru tech manual bob,i guess i listened to to many saying change the pump and ran into a money hole,tractor is a great one but i got pointed in wrong direction right off the bat,now all that is new ,the pump and drive shaft and gear and keyway,and i feel real safe bout that too
 
Francis, STOP tearing stuff apart and throwing $$$$ at parts and run the diagnostics "tree" to find out where the oil from the clutch pump is being lost.


WHY do you not want to do that?

As I said, you need to measure the flow and pressure that the clutch pump is putting out BEFORE tearing stuff downstream apart looking for a leak that may or may not exist.

(We still haven't explained why at one point you had lots of oil in the supposed-to-be "dry sump" and now you don't... what has "repaired" that problem?)
 
im going to take it to jd Friday maybe,they asked me to come help them load it up,they were the ones at first that said not to rely on people taking guesses at it but I was concentrating on the pump like everyone said,but its a little more than pump,i think its the inner gears like I thought all along,the planetary with all the packings and orings and piston in it,were going to run pressure checks like I been wanting to do but haven't had all the time I needed ill get it going or find out what pressure is off
 
pump is working,sucking in and pushing out,gotta save up some more so I can go further once at jd,pump never was bad,but its got a new one now,its got to be in one of the planetaries with them seals and orings id think,but the tests will show where,i say in torque divider area still
 
The pump needs to work "before" the rest of the system , I have seen the planatary's explode and still have hydraulics...
 
"its got to be in one of the planetaries with them seals and orings"

There's only ONE single "planetary" in that area.
Only other planetaries in the whole tractor are the final drives at the wheels.

"i say in torque divider area still"

There's NO "torque divider" in the clutch housing/front hinge.

And nothing behind there that is fed from the clutch pump.
 
bob n tim I got it loaded up on john deeres truck and got it to a shop down here in texas,,the trip between me and the dealer is 21 miles away,and the mechanic told me some one had taken a 2 foot by 2 foot box of fittings and sold them at a scrap yard and needed to be closer to where they had fittings in stock,but what bothers me is I never got to check each line on front pump yet which is the one that I suspected at first but left it alone because of the issues some center pumps have,,i kinda leaned to the rear pump at first because my old 7020 broke a gear one time and did about the same thing but would pull the steering all the way to the right when it did happen its under the rockshaft,,,but this thing on this 8630 took out everything,but its going to get tested all over,ill keep up with you friends about it too,thanks
 

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