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  #1  
Old 05-16-2010, 09:36 PM
Cubie Nubie Cubie Nubie is offline
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Default 1641 PTO/charging
Hi, Newbie Cub Cadet owner with some questions. I bought my first Cub Cadet 1641 ( former owner of a series of Sears tractors) just last week from the original owner who purchased it new in 1995. It has 513 hrs. on it and runs great. Only problem is that last owner said it has a charging issue & kills batteries. Only when I engage the PTO does the amp/dash light go on. When I disengage it goes out? The other thing I came across is that when I move the Hydro trans. into reverse the PTO drops out? Any thoughts or suggestions would be appreciated. Thanks
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Old 05-16-2010, 09:37 PM
Methos Methos is offline
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Old 05-16-2010, 09:43 PM
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Matt G. Matt G. is offline
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Welcome!

The PTO stops when you put it in reverse because of a safety switch. You can disable that if you like, but for liability reasons, we can't tell you how.

The wiring on these models is a bit complex. It's possible that there is a short or something causing excessive current draw with the PTO on, but if it's done that since new, that's unlikely. I don't think the Briggs engines have very strong charging systems. I have an older CC with a twin B&S in it, and the alternator can barely keep up when the PTO is on.
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Old 05-16-2010, 09:58 PM
Cubie Nubie Cubie Nubie is offline
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Thanks Matt for the quick reply. The original owner said it started having the charging problems in the last couple of years. Any thoughts on a good source for wiring diagrams? I guess if it is not a short my next option may be an alternator? After I straighten out the charging issue I may look into bypassing the PTO safety sw.
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Old 12-12-2010, 07:25 PM
whb52ford whb52ford is offline
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Default PTO Charging
I have the same problem. Just bought my 1641 from a dealer. First time using the snow blower the battery light came on. Eventually the battery went dead. Called dealer and he said I bought a used tractor. That ticked me off. Did anyone find that wiring diagram? I don't see an answer to the previous queston.
thanks
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Old 12-12-2010, 08:16 PM
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johncub7172 johncub7172 is offline
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  #7  
Old 12-13-2010, 08:48 PM
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NW Hick NW Hick is offline
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Default I have a 1641...
Hi, I have a 1641 with the vTwin B&S. Kindly note the initials of the engine mfg ; )
While I have not taken this one apart, my first guess is that you are gonna spend a long time looking for an alternator...B&S tends to pull a trickle charge off the magneto and you can expect to get about 3 amps off of it. You mention that the only time the load indicator glows is when the PTO is engaged...are you sure? Start the engine, then move the key one click to the left and turn the headlights on...the Load Indicator should glow and it is normal to see this until you are at about 1/2 speed.
Again, I am just guessing here, but if you are having voltage issues when you turn your PTO on, the problem is in the PTO.
Ammeters are popular, but almost useless. You want a Voltmeter, as it tells you what is really going on: Turn the key to "on", do you have at least 11.5 Volts? Start it up and see what your voltage is like fifteen minutes after running at full speed...I like to see about 13.8 - 14.2 volts, but understand that your mag can put out 110 volts, so don't leave a voltmeter hooked up when you have the engine wound up. You can hook it up, run the engine at 1/2 speed, check the voltage, turn on the lights, turn on the PTO, watch your voltage and all will be revealed....
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Old 12-13-2010, 10:08 PM
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Matt G. Matt G. is offline
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Quote:
Originally Posted by NW Hick View Post
Hi, I have a 1641 with the vTwin B&S. Kindly note the initials of the engine mfg ; )
While I have not taken this one apart, my first guess is that you are gonna spend a long time looking for an alternator...B&S tends to pull a trickle charge off the magneto and you can expect to get about 3 amps off of it.
(at least for this engine)

The 16 hp Vanguard used in the 1641 has a 16 amp alternator under the flywheel. I am not terribly familiar with B&S engines, but I can tell you that none of the opposed twins or V-twins used in the Cub Cadets have anything other than a stator under the flywheel for charging.

Roland probably has a wiring diagram. This series has horrible wiring that is overly complex. Too many relays, safety switches, and idiot lights. Chances are there is a bad wire or a ground issue somewhere...these are notorious for that.
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Old 12-14-2010, 06:20 AM
R Bedell R Bedell is offline
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The typical Elec PTO generally draws about ~3 to 4 Amps.

I have no clue about the charging system on the B & S, but one would think that the CC engineers would see that the charging system would handle the PTO draw when they spec'd the B & S motor out.
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Old 12-14-2010, 06:22 AM
R Bedell R Bedell is offline
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Quote:
Did anyone find that wiring diagram?
If you want a Wiring Diagram for the 1641.....just say so.
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