JD 6620 Titan II steering feels heavy/slow. Is it just me?

John_PA

Well-known Member
On my old gleaner K I could turn the wheel with 1 finger as fast as I could whip it around. It also felt like it took less wheel revolutions to go full stop to full stop.

With this 6620, I feel like I need to turn it a lot more just to get change in direction and the steering feels pretty heavy or sluggish.

The real bad part is going down the road at 25 mph having to make 90 degree corrections on the wheel, just to stay straight. Then, when I jump in the truck after running it, I always over-steer the truck and look like a fool.


Are they all this bad, or am I just crazy? Or am I crazy and they are all this bad. I have never been accused of being sane, anyhow.


Thanks
 
I have no experience with that model. But it sure doesn't sound right.
I am only commenting because I recall a steering problem that may give you some ideas.
Gleaner F with steering issues- they went through everything in the steering and could find nothing wrong. Finally discovered a never, or little used spool in the main valve stuck just off center. If I recall the rest of the system worked OK. So maybe it was just enough to fool the priority valve?
 
Inside the steering cylinder, the hydraulic ram
that moves the tie rods, there is an o-ring, and
there should be 2 o-ring "backers", one on each
side of the o-ring. Sounds like the o-ring is
shot, and the backers are gone.

I had this happen to me on my Fox SPF; I am not
sure if your John Deere is similar, but I had the
exact same steering issues that you are having.

The repair parts cost $3.00. Took about and hour
of my time to replace the o-ring and backers.

Hope that helps! Best of luck!
 
Well your old Gleaner "K" had one small steering cylinder and weighed about 1/3 of your JD 6620. You should have the heavy rear axle that has two steering cylinders. The steering motor (JD calls it the steering "PUMP" on the 6620) under the column has to move more oil to steer. They should not feel "heavy" unless you are used to something that steers real light like your TRUCK.

The hydraulic pump under the seat does have a separate section just for the steering. (I think the unloading auger swing shares the circuit too.) The steering system shares the reservoir with the main pump but has its own separate pump section. You can check the pressure on the steering circuit. There is a test port on the side of the hydraulic pump. You dead head the steering and the pressure will spike to what the relief valve is set to.

I would either have some one that know what they are doing check it out or buy a JD service manual so you can check it out.

The hydraulic pump is different on the heavy rear axle machines. The pump has higher flow for the double steering cylinders. I have seen the wrong main pump on the heavy axle and it will make them steer funny.

The steering control "pump" is different on the double cylinder axles too. So you may have the wrong one of them on too. The correct one, for a double cylinder axle, is part # AH142441 list $1393.85.

I would have some one that is "used to" a JD Titian II drive your combine. You may have nothing wrong other than you are used to the Gleaner "K".
 
My 6620 T2 steers pretty loose to. It doesn't take much effort, you just have to move the wheel quite a bit to correct. Looking at mine I suspect someone has swapped in a heavy axle without changing the pump and motor. I have never checked part numbers. I put a steering knob on the wheel and am used to it. Also, how do you get a 6620 to go 25 MPH?! Mine will top out at 17 MPH on a down slope.
 
Scott,

I got the 23.1-26 on it, and when in 4th gear, that thing really rips. Downhill? I am too scared to look at the mph while I am steering, but, on the gentle downhill roads, I see it hit 23 or 26 quite constantly.


It won't pull out uphill in 4th gear. Im afraid of it 99.9% o the time in road gear. my knees knock together...
 

John I think your ground speed sensor is WAY off. A JD 6620 Side hill will not go over 18 maybe 19 MPH. They have a higher final drive ratio than the regular JD 6620s. Also the 23.1 x 26 tire is the smaller tire they could have had on them. There are many out here with 24.5 x 32 on them. They will only run 20 MPH.

I wonder if your machine is on Kilometers per hour???
 

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