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Play in swing frame, Cat305 E2, 1700hrs

motionclone

Well-Known Member
Joined
Aug 6, 2020
Messages
99
Location
Maine, USA
Got some excessive play in my swing frame to boom connection. Is this possibly a worn pin or would the bushings be wrecked? I have about .045 of lateral play at top pin and about .030 of vertical play, videos below. I think im missing the top shim which is supposed to be .020 as i see no space at all between the top forged ears of the swing frame and boom(red arrow in pic below)


swing frame missing bushing.jpg
 
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Nige

Senior Member
Joined
Jun 22, 2011
Messages
33,174
Location
G..G..G..Granville.........!! Fetch your cloth.
Is this possibly a worn pin or would the bushings be wrecked?
Most likely to be bushings but don't count on the pin having no wear at all. Maybe the pin could be slid part way out for inspection.? At least far enough to look at the surface of the pin where it rotates on the bush.

I see that 0.020" thick spacer. So it's not there on your machine.? Never been there as far as you know.? The parts list calls for two of them in that location.

There is a mountain of work and required tooling to remove the swing frame. Maybe a short-term fix would be to get hold of some 0.030" material and manufacture a shim for the top. If you can then raise the uppser pin far enough the shim could be slid into the space. TBH I would also manufacture a shim for the bottom of that same joint which looks as though it has far more daylight between the frame and the boom than the upper side does. If you can cut down the movement relatively easily you could then monitor the lateral movement going forward.
 

Attachments

  • 266-3874.pdf
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  • Swing Frame Specs.pdf
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  • Boom Support R&I.pdf
    816.6 KB · Views: 3

motionclone

Well-Known Member
Joined
Aug 6, 2020
Messages
99
Location
Maine, USA
Thanks Nige. I cleaned things up better at the spot where there are supposed to be the .5 mm shims and there are no shims. Not sure I can make up some .030 shim stock, since i dont have a lathe and machine shops around here are sparce. Could i get the correct shims and put them in the top? Where there are supposed to be some? Wonder what happened? I bought the cat used with 1500 hrs, and noticed some play when i got it at 1500 hrs
 

Nige

Senior Member
Joined
Jun 22, 2011
Messages
33,174
Location
G..G..G..Granville.........!! Fetch your cloth.
Could i get the correct shims and put them in the top?
Sure you could. Just that because you have a 0.030" (1.5 shim thickness) gap my thought was to get hold of some material of the appropriate thickness and custom make a shim to fit your specific circumstances.

The shim is 92mm inside diameter and 133mm outside diameter. TBH with material only 0.030" thick you could almost make one using a 4" grinder equipped with a cutting disc if you had steady enough hands.
 

motionclone

Well-Known Member
Joined
Aug 6, 2020
Messages
99
Location
Maine, USA
Ok so I put a jack under the bottom pin and jacked up taking up all slack, got .042 in feeler gauges in that top joint so those factory shims should be just about right.

Also I pulled the pin and yes there is wear and the pin measures oval shape on the upper part of it. .010 measured with a caliper. I was surprised because that's a fixed no rotation part of the pin. so I guess I'll get a new pin and shims?
 

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  • 20250104_154739.jpg
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