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cat 225 excavator 51u serial number. Drive sprocket bolt loose

V

Vernon Lowe

Active Member
Joined
Oct 2, 2022
Messages
41
Location
Tennessee
machine quit pulling on one side and found the bolt is loose enough that the bolt is spinning and the sprocket isn't turning. I've never worked on one of these,is the sprocket splined and is the bolt right hand or left hand thread? i tried to tighten it with a 1 inch impact but it wouldn't budge. Any advice? thanks
 
Nige

Nige

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Joined
Jun 22, 2011
Messages
29,390
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G..G..G..Granville.........!! Fetch your cloth.
See below. This may or may not be for your machine because there are various S/N breaks in the 51U-prefix. Please quote a full S/N for exact information.

Sprocket appears to be splined on to the shaft. See the attachment which again is not guaranteed to be your machines (there are 2 different procedures). Bolt is RH thread. Could the shaft possibly be broken inside the housing.?

upload_2022-10-2_17-31-9.png
 
V

Vernon Lowe

Active Member
Joined
Oct 2, 2022
Messages
41
Location
Tennessee
Nige said:
It is.
I found the final drive etc, for your Serial Number and discovered they are different LH & RH. I suspect a lot of parts will be the same for either side but I don't want to give you wrong info. So which side of the machine are you working on.?
Click to expand...
I think it’s the right side ,if the idler is at the front of the cab looking down at it from operators seat the sprocket it at the rear right side
 
Nige

Nige

Senior Member
Joined
Jun 22, 2011
Messages
29,390
Location
G..G..G..Granville.........!! Fetch your cloth.
Vernon Lowe said:
I think it’s the right side ,if the idler is at the front of the cab looking down at it from operators seat the sprocket is at the rear right side
Click to expand...
That would be the RH side.
Vernon Lowe said:
Is there a trick to getting the bolt loose other than heating it up? I’m afraid it’ll break
Click to expand...
If the shaft is foobarbed it won't matter if the bolt breaks or you have to cut it off. You'll be needing a new one anyway.

See the attachment for parts and disassembly/assembly procedure.
 

Attachments

  • 8K0175 Final Drive.pdf
    2.7 MB · Views: 17
V

Vernon Lowe

Active Member
Joined
Oct 2, 2022
Messages
41
Location
Tennessee
Nige said:
That would be the RH side.
If the shaft is foobarbed it won't matter if the bolt breaks or you have to cut it off. You'll be needing a new one anyway.

See the attachment for parts and disassembly/assembly procedure.
Click to expand...
Thank you
 
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