Backhoe KB2385 limited swing

[c10]

TD100 Hydraulic hoses are to the outside, the cylinder is the one with the welded collar and pivot studs. I pulled a pin and the boom rotates completely to the outrigger, pin still disconnected opposite swing piston fully extended only moves 20 degrees.

 

[c10]

ON84 thanks for your interest! 6.5 is what my mounts are also. 100td is helping solve this problem also.It appears the piston is at the end of it's travel at 20 degrees. I'll try to download some pic and keep plugging along. thanks againView attachment 565983View attachment 565984

 

[100 td]

Your attachments/pics links are not working.
Whilst the rod is disconnected, extend the rod with hydraulics to full extension and take picture and measure full extension and full retraction. Do it where it is, as pictured now, just fully extend from there, leaving the boom where it is. Same for retract. Be careful, the boom will want to swing, especially as soon as the disconnected cylinder comes to its stop when retracted fully.
The specs I previously gave are for a later (revised) cylinder than yours, they may be the same, or not. It's just what is listed in the manual. From the picture it appears a stroke of ~9" would be sufficient, plus the rod eye to make it up to approx 11" from cylinder end to rod pin center. However if the rod can go back into the cylinder when disconnected another inch, it may not be enough stroke. Pics and measure will confirm.

 

[100 td]

I measure approx 8" from cylinder face to rod end connection,when the boom is straight ahead.

Is that to outer of rod end, or center of pin?

6.5 inches. The hydraulic connectors face out.

@ON84, is that the same measure c10 performed?
EDIT: Ooops missed this

ON84 thanks for your interest! 6.5 is what my mounts are also.

So the trunnion mounts are the same?
One other really long shot is the pistons being fitted backwards reducing the stroke. Let's wait for everything else before even considering that.

 

[Amvcane]

I have a KB2475 hoe. When I mount it, I usually land the 3pt on top of the platform in the blue circle, this time I didn’t. Following this thread I went out to look at my unit and noticed the back of the swing cylinder is hitting the 3pt arm. I raised the arms a little and locked out the MLS valve. All good now.
Make sure there isn’t anything hitting the back of the cylinder, stopping it from moving through its full intended arc.

 

[c10]

Anvcane Thanks for the tip! I just checked mine and the install is correct. At 20 degrees my cylinder [left or right swing] is at full extension and appears bottomed out. How long are the cylinders on your machine? Thanks again

 

[Amvcane]

My cylinders are as long as they need to be so the hoe swings 90* each side of center.
I’m guessing that you are saying that the cylinder shown in post 11 is fully extended?
Are the cylinders plumbed correctly? I added a pic showing how the two cylinders should be plumbed.

 

[100 td]

As I previously noted, the parts listing for your backhoe shows specifications of a ~9" stroke.
The first and only picture you have posted appears to confirm a 9" stroke cylinder would be quite sufficient for your hoe.
I previously asked you to measure and take pics of the stroke of your cylinder.
I have now found specifications for a different hoe with the same cylinder part number that you noted, it's specs show a shorter stroke of ~7". This is interesting, perhaps they are only listing the required stroke length, and not the actual stroke length, (which is strange) as it is listed as ~7" and ~9" for the same part number in two different applications. But as I have found in many manuals, part numbers, drawings and circuits are not always correct.
Please measure and take pics of fully extended and retracted cylinder whilst disconnected.
If it is in fact only a 7" stroke, it's likely it's the wrong cylinder and needs to be replaced. Please measure outer length of cylinder case and perhaps Amvcane will also be able to measure his to compare, as his hoe has the same cylinders, per the manuals, which may be incorrect.

 

[c10]

100td The pictures indicate the fully extended piston -same disconnected or not.please note the welds on the trunion pivot. these parts appear to be welded at the same time the trunion was replaced.The cylinder measures approx 12" any ideas?

 

[100 td]

KB2365 specs Retracted length 145mm 5.709" extended length 175mm 6.89" BH18-0100, BH18-0100-A, BH18-0100-B
KB2385 specs Retracted length 138mm 5.433 extended length 228mm 8.976" BH18-0100, BH18-0100-A, BD18-0100-B
KB2475 specs Retracted length 138mm 5.433 extended length 228mm 8.976" BH18-0100, BH18-0100-A, BD18-0100-B
As previously noted, who knows what their actual measurements mean, and if they are correct, as well as part numbers.
Part numbers are original, and superseded after certain serial numbers.
What has been replaced on your hoe?
It appears the trunion mounts are original, it appears the top swing pivot has been welded/ground, it appears the bottom swing pivot may be original?
What do you think from looking up close, is the bottom swing pivot original? Is it possible new swing pivit plates were installed and they were made a bit longer?
Measure the distance from the center of the swing pivot pin to the boss of the trunion mount, and see if Amncane can do the same.
12" cylinder with 2"end cap and 2" piston allows for maximum 8" stroke, what stroke length have you measured after pushing piston all the way back? I can see from the pic about 7" but haven't seen full retraction.
I think the critical measurement you need to confirm is the pivot point, but if that is correct, then cylinders are the issue.
Hopefully Avmcame can confirm his cylinder length and stroke length.
But to really compare his to yours, you would need a couple more measurements. And unfortunately part numbers may be incorrect, also manual could be wrong, but his specs show same as yours. Let's see if he can help before pulling it apart.
So, 2365 says 7" stroke, 2385 9" stroke, 2475 9" stroke, yours appears short