523-H high roller

[kpinnc 16,611]

13 hours ago, cleat said:

Yes, the lift bellcrank is slightly shorter on the reduction steering models.

I found that out the hard way also.

 

Forgive the dumb question- what did you do to resolve it?

 

Obviously my thinking is to trim it down and use the next hole on the tab. But I am curious if anyone has ever measured the difference between the standard vs. shorter versions. 

[cleat 8,374]

57 minutes ago, kpinnc said:

 

Forgive the dumb question- what did you do to resolve it?

 

Obviously my thinking is to trim it down and use the next hole on the tab. But I am curious if anyone has ever measured the difference between the standard vs. shorter versions. 

 

Here are the two.

 

Shorter with reduction steering.

 

Regular steering.

 

[kpinnc 16,611]

18 minutes ago, cleat said:

Here are the two.

 

That is amazing as always sir!

 

Looks like the second hole in the original is less than 1/4 inch different from the first of the special model. 

 

I'm not going to try and open this center console back up. It looks to me that trimming the original down and using the second hole is pretty close and should be all the lift I will need. 

 

Thank you @cleat!!! 

[Handy Don 15,629]

2 hours ago, kpinnc said:

Looks like the second hole in the original is less than 1/4 inch different from the first of the special model. 

I noticed on our 520 (and on my 854) that the full arc of the lift arm is pretty close to 60º.

In effect, the center-to-center distance between a hole in the arm and the rock shaft equals the maximum range of the lift (= 2 x sin(30º) x C2C)

Using the second arm hole provides one inch less movement (vs. the outermost hole on the 8-speed arm) to a link that is perpendicular to the arm at the midpoint of its arc. 

The full range of the outer hole is ~4.25” so you will have 3.25” or ~23.5% less range. 

Edited 10 hours ago by Handy Don

[ebinmaine 76,543]

17 minutes ago, Handy Don said:

I noticed on our 520 (and on my 854) that the full arc of the lift arm is pretty close to 60º.

In effect, the center-to-center distance between a hole in the arm and the rock shaft equals the maximum range of the lift (= 2 x sin(30º) x C2C)

Using the second hole arm provides one inch less movement (vs. the outermost hole) to a link that is perpendicular to the arm at the midpoint of its arc. 

The full range of the outer hole is ~4.25” so you will have ~23.5% less range. 

 

I'd be concerned  (perhaps unfounded)  that if I used the second hole for something heavy like a snowblower it would be much more taxing on the lift mechanism as a whole.  

 

Thoughts? 

[Handy Don 15,629]

1 minute ago, ebinmaine said:

 

I'd be concerned  (perhaps unfounded)  that if I used the second hole for something heavy like a snowblower it would be much more taxing on the lift mechanism as a whole.  

 

Thoughts? 

Given that the lifted weight is the same (the blower), the closer hole is an easier to lift but yields less travel/movement/height and less torque on the rockshaft. But the forces on the rockshaft bushings will be the same. 

[Handy Don 15,629]

If having the max lift range matters (and to me it would), I’d seriously consider:

- trimming the end of the arm

- welding up the remains of the outermost hole

- sistering the arm with some ⅛" sheet metal welded on both sides and rounding the end of the arm

- drilling a new hole centered ½” from the end if the shortened arm

 

Yes, a bit awkward with the rock shaft in the tractor. 

 

Edited 10 hours ago by Handy Don

[ebinmaine 76,543]

28 minutes ago, Handy Don said:

If having the max lift range matters (and to me it would), I’d seriously consider:

- trimming the end of the arm

- welding up the remains of the outermost hole

- sistering the arm with some ⅛" sheet metal welded on both sides and rounding the end of the arm

- drilling a new hole centered ½” from the end if the shortened arm

 

Yes, a bit awkward with the rock shaft in the tractor. 

 

 

 

I may move the steering gear itself forward a couple hairs. Redrill with 4 new holes instead of just the 2 forward ones. 

[kpinnc 16,611]

5 hours ago, ebinmaine said:

may move the steering gear itself forward a couple hairs. Redrill with 4 new holes instead of just the 2 forward ones. 

 

This was actually something I had thought about. I only need about 1/4 inch for the lift to clear. Maybe less... 

 

The upper steering shaft is the only thing that would be of concern. The hole that it passes through is partially slotted already. 

 

Definitely got some work to do.