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#1
07-14-2017, 01:44 PM
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1872/2072 pto
Does anybody know what size is the pulley on a Magnum 20 PTO? Normally the M18 got a 1 1/8" crankshaft but the one I have got a 1" crankshaft with a 6" pulley so I have no clue where this come from yet.
The PTO I got for the M20 fit on his 1 1/4" crankshaft and has a 4.5" pulley but that pulley can move around in the casing!  Is it suppose to do that and do I have the right size pulley? 
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Gilles. 1988 2072 401 54" hyd angled blade 1988 1872 364 snowblower/C50 deck 1976 1650/QA42A blower/44A deck/standby 1976 1450TS/Sleeve hitch/44A deck/in storage 1963 100 (red)/in storage 2010 Kubota 2380-2/42" infinity deck (engine swap) 
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#2
07-14-2017, 02:15 PM
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You realize, that Kohler had different sizes of crankshafts within an Engine Family, for different OEM's to suit their needs. Just because you have a M18 or M20, doesn't mean that all PTO's are going to fit all applications.
The only way to get the correct PTO to what you need, is by getting the PTO specific to the Kohler "Spec Number" and the OEM (ie: Cub Cadet, Toro, MTD, Sears, etc). For example: Cub Cadet M20-49512.
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Roland Bedell CC Models: 100, 105, 1450, 782, (2) 784, & 2072 Buy: Made in the USA 
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#3
07-14-2017, 08:33 PM
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Roland the M20S spec number is 49512 so yes it's a Cub cadet engine with a 1-1/4 crankshaft, Kohler number 52 014 71-S and the PTO part number for this engine is 917-3043 but the pulley size is nowhere to find on CC parts chart.
The M18S I remove from the 1872 is a puzzle! He got the right spec number on his little plate (24506) for a cub cadet engine but instead of having a 1-1/8" crankshaft, Kohler number 52 014 66-S like he should he got a 1" crankshaft so what happen here? First explanation who come to my mind is someone swap that plate on that engine but who knows maybe the keyway was so mess-up they just remove 1/8" from that crankshaft and broach a new keyway. That can explain the smaller crankshaft size and strange PTO with a 6" pulley on it instead of the OEM 913-3044. All that to say I just need to know what is the size of the pulley on a 1872 and 2072 PTO so I can figure if the PTO I have is salvageable before buying parts to repair it.
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Gilles. 1988 2072 401 54" hyd angled blade 1988 1872 364 snowblower/C50 deck 1976 1650/QA42A blower/44A deck/standby 1976 1450TS/Sleeve hitch/44A deck/in storage 1963 100 (red)/in storage 2010 Kubota 2380-2/42" infinity deck (engine swap)
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#4
07-14-2017, 08:40 PM
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Both the 2072 and 1872 had the 4-1/2" PTO from the factory. My guess is someone swapped the M18 into that tractor and they put the wrong PTO on it.
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2264 with 54 GT deck 1641 AKA Black Jack with a 402-E Haban Sickle bar mower JD317 dump truck BX2670 with FEL
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#5
07-14-2017, 08:51 PM
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Quote:
 Now I can work on the M20 PTO knowing he got the right pulley size and fit on the crankshaft too. The armature moving around is strange, all my other CC PTO are solid nothing move exception of the pulley spinning of course! What ever happen on that M18 is a mystery! Only the devil know.. 
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Gilles. 1988 2072 401 54" hyd angled blade 1988 1872 364 snowblower/C50 deck 1976 1650/QA42A blower/44A deck/standby 1976 1450TS/Sleeve hitch/44A deck/in storage 1963 100 (red)/in storage 2010 Kubota 2380-2/42" infinity deck (engine swap)
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#6
07-14-2017, 09:52 PM
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Gilles arent the spec numbers on the covers/tins so maybe the engine was swapped back in the day but original tins/covers from the original motor were put back on the swapped in motor? That seems like the most likely scenario to me.
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(2) Original, 100, 102, 124, 73, 800, #1 and #2 cart, brinly plows, disk, IH184, IH244, 1948 F Cub
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#7
07-14-2017, 11:35 PM
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Quote:
Like they says "The truth is in the pudding!"
__________________
Gilles. 1988 2072 401 54" hyd angled blade 1988 1872 364 snowblower/C50 deck 1976 1650/QA42A blower/44A deck/standby 1976 1450TS/Sleeve hitch/44A deck/in storage 1963 100 (red)/in storage 2010 Kubota 2380-2/42" infinity deck (engine swap)
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#8
07-15-2017, 06:30 AM
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Gilles:
Maybe the M18 had a crankshaft swap out. Someone not knowing the differences in the crankshafts, ordered or bought the first M18 crank they could get their hands on. Who knows, but an interesting mystery.
__________________
Roland Bedell CC Models: 100, 105, 1450, 782, (2) 784, & 2072 Buy: Made in the USA
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#9
07-16-2017, 08:13 PM
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Quote:
I don't want to open that can of worn but find parts for it is a PITA without the real spec number, I think this engine crankshaft number is 52 014 79-S, so he came from something like a Snapper or a Grasshopper LT. I remove the front oil seal almost with my bare hands, now it's Google time for a new one but wait! The casing is not the same as the one I got on my M20 so what the frack is it? 
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Gilles. 1988 2072 401 54" hyd angled blade 1988 1872 364 snowblower/C50 deck 1976 1650/QA42A blower/44A deck/standby 1976 1450TS/Sleeve hitch/44A deck/in storage 1963 100 (red)/in storage 2010 Kubota 2380-2/42" infinity deck (engine swap)
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