536.886331 10hp/29" Craftsman Jack shaft problems - Snowblower Forum : Snow Blower Forums
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post #1 of 20 Old 03-09-2018, 10:33 AM Thread Starter
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536.886331 10hp/29" Craftsman Jack shaft problems

I lent my Track Drive 10/32 to my friend because his blower wasn't working right. I took a quick look and the Jack shaft sprocket assy #34 538010 or Murray number 761789MA is rounded over and the sprocket that is in the hex shaft the friction plate is trashed. The craftsman website doesn't show #26 in the parts list.

Does anyone have a part number for this shaft/sprocket? Does anyone have a good used one that I could buy? I would like to get both parts good used if possible.

I'm not sure why these sprockets went bad. There seems to be a lot of side to side play in the hex shaft#26 and the #41 chains looked like they were never oiled or greased. I think that the the dry chains destroyed the two small sprockets. Thoughts? The machine is in real good condition and I would like to get it going again for my friend.

https://www.searspartsdirect.com/mod...7/1507200.html
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post #2 of 20 Old 03-09-2018, 10:54 AM
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It's not listed as the part is obsolete and not available, part #33112

You may be able to cross reference it to Murray as that is who built your machine. I have a similar machine Craftsman II 10/29, I have 2 Murray's in my yard, levers are different, I will look for you.

1986 Ariens ST522, 5hp, 22"
1995 Murray Craftsman 10hp, 29" w. 12" impeller
A 1983 Real John Deere 10hp, 32" w. 12" impeller, 16" auger, 20" high front, cast iron gear box, chains
Noma 9hp, 27" w. 12" impeller
Noma 5hp, 24" w. 12" impeller, 20" high front
Gravely Convertible, 12hp Kohler cast iron, 26" width, 600 lbs of cast iron & steel, 2 speed impeller, 4 ground speeds
Dynamark 8hp, 26", 12" impeller, for sale
Several other 5hp, 8hp, several 2 cycle, all for sale
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post #3 of 20 Old 03-09-2018, 11:17 AM Thread Starter
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Originally Posted by JLawrence08648 View Post
It's not listed as the part is obsolete and not available, part #33112

You may be able to cross reference it to Murray as that is who built your machine. I have a similar machine Craftsman II 10/29, I have 2 Murray's in my yard, levers are different, I will look for you.
I ordered a 8 tooth #41 sprocket that I could weld on, but I would rather not. I ordered the jack shaft sprocket #34. It was cheap enough on ebay.
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post #4 of 20 Old 03-09-2018, 11:32 AM Thread Starter
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Originally Posted by JLawrence08648 View Post
It's not listed as the part is obsolete and not available, part #33112

You may be able to cross reference it to Murray as that is who built your machine. I have a similar machine Craftsman II 10/29, I have 2 Murray's in my yard, levers are different, I will look for you.
That Craftsman II 10/29 is the same exact machine. Make sure the internal chains are well lubed. I would even check the side to side play on the 33112 shaft-this one seems excessive. The shifter arm also seems to rub on the 33112 shaft, which is the reason that clip in the picture is all mangled. There should be some kind of stop on that arm.
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post #5 of 20 Old 03-09-2018, 11:49 AM
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Three are two Murray parts that may work, #579897 superseded by #585855MA

Amazon $30, eBay $40, JacksSmallEngines $35

1986 Ariens ST522, 5hp, 22"
1995 Murray Craftsman 10hp, 29" w. 12" impeller
A 1983 Real John Deere 10hp, 32" w. 12" impeller, 16" auger, 20" high front, cast iron gear box, chains
Noma 9hp, 27" w. 12" impeller
Noma 5hp, 24" w. 12" impeller, 20" high front
Gravely Convertible, 12hp Kohler cast iron, 26" width, 600 lbs of cast iron & steel, 2 speed impeller, 4 ground speeds
Dynamark 8hp, 26", 12" impeller, for sale
Several other 5hp, 8hp, several 2 cycle, all for sale
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post #6 of 20 Old 03-09-2018, 12:11 PM Thread Starter
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Originally Posted by JLawrence08648 View Post
Three are two Murray parts that may work, #579897 superseded by #585855MA

Amazon $30, eBay $40, JacksSmallEngines $35
Just made an offer on this whole assy.
https://www.ebay.com/itm/Craftsman-M...torefresh=true
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post #7 of 20 Old 03-09-2018, 12:27 PM
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I looked at. Whatever you do, that shaft should have a very very very thin coat of synthetic grease. There also may be a grease fitting, you can use any grease for that though I prefer synthetic.

1986 Ariens ST522, 5hp, 22"
1995 Murray Craftsman 10hp, 29" w. 12" impeller
A 1983 Real John Deere 10hp, 32" w. 12" impeller, 16" auger, 20" high front, cast iron gear box, chains
Noma 9hp, 27" w. 12" impeller
Noma 5hp, 24" w. 12" impeller, 20" high front
Gravely Convertible, 12hp Kohler cast iron, 26" width, 600 lbs of cast iron & steel, 2 speed impeller, 4 ground speeds
Dynamark 8hp, 26", 12" impeller, for sale
Several other 5hp, 8hp, several 2 cycle, all for sale
JLawrence08648 is online now  
post #8 of 20 Old 03-09-2018, 06:29 PM
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Those shaft end bearings are lightweight, they will last a while but will fail usually at a bad time.
Sid

'66 Sears/Murray 26"
'71 Jakobson 17 SnowBlitz
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post #9 of 20 Old 03-09-2018, 07:35 PM
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From what I can see it looks like that sprocket is worn down to the nubs. The only time I've seen something like that was when the sprocket on the other end was sloppy and sliding side to side when in use.
If that's the case, when it's repaired shim the sprockets so they stay in alignment.
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post #10 of 20 Old 03-09-2018, 08:13 PM
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Originally Posted by HCBPH View Post
From what I can see it looks like that sprocket is worn down to the nubs. The only time I've seen something like that was when the sprocket on the other end was sloppy and sliding side to side when in use.
If that's the case, when it's repaired shim the sprockets so they stay in alignment.
This is accurate good info. The longer full bucket width jack shafts also wear dimensionally side to side. You can spend time and money replacing the cheap side bushing/bracket/retainers only to have the thing wobble out again. Once you have the new piece in hand you can see the old one actually wore away side to side and was no longer the correct dimension to fit in the machine. My son just did this repair on an 11/30 Craftsman/Murray. The other shaft "upstream" and it's sprocket were out of functional dimension causing the wear. HCBPH speaks with great knowledge and experience as always

Last edited by sscotsman; 12-08-2018 at 06:07 PM. Reason: restored original post.
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