Cat D47U Wiring Diagram

Schillercat

New User
Anybody have a wiring diagram for a Cat D47U. It has factory
installed starter and generator. 24V. Generator not charging. Field
voltage is zero. Need to see how it?s supposed to work. Thanks!!
 
You will find a wiring diagram in the back of the parts book,why do you come to the conclusion the wiring is wrong did you alter it? that or someone else would be the only reason the wiring would be altered,first thing check any circuit breaker has not popped and reset it,it might help if you polarise the generator,momentarily use a jump wire between the Bat terminal on the regulator and the Arm or Gen terminal,engine stopped hold one end of the jump wire to the Bat terminal and tip the Arm or Gen terminal like cracking a match and see if you get charge.
AJ
mvphoto24005.png
 
Wow...huge thanks for such a fast reply. Much appreciated ! I tried up upload an image / picture of my project, hopefully it works. Good question on why the wiring diagram. I guess that"s how I trouble shoot, meaning, it helps me to see how it"s supposed to work so I can test the circuit at the various points to see what"s up. Honestly, I didn"t imagine there"d be a circuit breaker. That may be the only issue. I do know when it"s running and it"s all connected, the field wires on the generator are dead, and so was going to start tracing upstream to see where the problem is. It is very possible the breaker needs to be reset. Let"s see if I can find it. Have had this D47U for about a year.... The person I bought it from has had it in a storage building for about 40 years.... Seems the steering clutches and main clutch work well, and it runs surprisingly well. Needs a little TLC however. The main clutch brake doesn"t seem to be working, as it takes too long for the gears to stop turning, when I first want to put it into gear. The glow plugs, I"m guessing aren"t working, as the only way to start it when it"s cold is to give it a little shot of starting fluid. My plan is to do a restore on this unit, no real schedule...so it"s going to take a while. Fun little unit !!! Again, huge thanks for your quick response ! I"ll need to get some manuals the way it looks. I"m guessing, I"m going to have a few questions.....
a280822.jpg
 
Decent looking tractor that,when you turn the switch to the heat position you should hear the relay click,the ammeter should show a discharge of approx 26/28 amps if all four of the glow plugs are working while you hold the switch on heat,the circuit breaker should be on the dash,small red button often painted over,don't go by the wires coming off the generator,just see they are intact,they don't work like you are thinking.try the polarizing.
AJ
 
Perfect....I hope to get there today...will try it and will let you know. One more quick question....I was reading about this machine last evening, and sounds like some of dry and some have wet clutches? Is it easy to determine which I have? Thanks !
 
Below are two pictures of the regulator & generator.... A1 and A2 and Bat....I'm wondering about the polarization step....bat to A1 or Bat to A2?
a280824.jpg

a280825.jpg
 
That is not the correct polarizing instructions. You have an American Bosch Generator which is a "B" type generator.
To polarize, disconnect field wire from regulator and momentarily jump to battery terminal of regulator.
 
The big problem you need to address is your hauling set up , there is no way i would even think about hauling that tonka toy on that set up , your trailer is way over loaded and ya don't have enough Mule in ft. . Made that mistake with a J D 450 C on a tri axle and behind a heavy 3/4 ton 4x4 one time and one time only .
 
Thank you for your input and for taking the time to post the response. You?ll get no debate from me on this one! The mule is a one ton diesel but that doesn?t reduce your point. Best regards!!
 
Thought you would have the more common Delco charging as you did not say,you now need to check that the generator is Bosch as well as the regulator they must match,the polarization can be needed if the machine has been standing for a long period of time,what's the history,was it ever charging.
AJ
 
Hello.
I did check today, and as it turns out, I do have the "Bosch" generator. I see the hole for the circuit breaker button where the breaker used to be. Looks like it was removed. Do you have any idea where I might be able to buy that original breaker? I'm attaching the two pictures I snapped showing the serial numbers. The first picture is the back of the Cat - name tag, and the second picture is the tag attached to the engine. Thanks again for all the input ! By the way..had only a few minutes to play on the generator. The battery terminal of the regulator was hot at 24 V, and I did manage to polarize by touching the field wire to the Bat Terminal. I measured the field wire after it was removed from the regulator...it measured about 170 ohms. ..probably ok. When I actuate the switch which runs the glow plugs I can hear the relay pull in, however, the amp meter doesn't move. I'm guessing there's a wire disconnected somewhere.... I've not opened the regulator cover....that could be dirty or needs a little attention as well. Just didn't have time to play too much today. All the best !
a280984.jpg

a280985.jpg
 
Original circuit breaker was built by Klixon and was 40 amp. They are an obsolete item but sometimes come up for sale on ebay. 60 amp versions seem more common and would probably be ok to use.
 
My notbook says 5M2555 for the 40amp circuit breaker,do a Google with that # only and it will bring up some on Ebay and elsewhere,at the moment the old circuit breaker must be bypassed when you hear the relay closing,it is possible that the four glow plugs are burned out,it is also possible that the wire from the relay is broken between there and the bus bar,connect a test lamp or volt meter to one of the glow plug terminals and see if you get a reading when you apply heat,a reading would mean that the power is ok,disconnect the bus bar from all four plugs and test each one,connect one side of the volt meter to the main battery cable on the starter and the other end to the glow plug terminal,if good they will read the battery voltage 24V,if the machine has been standing for a long time the generator may need cleaning,ie the brushes can stick etc,the regulator points can also rust up,I mentioned the history before but you are not forthcoming, was it charging or not,or is the reason it's not charging the wiring has bee altered?.
AJ
 
Thanks A.J. for the ideas on how to test the glow plugs and for the circuit breaker info. I will get in on eBay. Without a doubt, some of the wiring had been altered however based on what I see in the wiring diagram should be pretty straight forward to get it back to original. I?ll test the glow plugs and let you know. I?m on a business trip for a few weeks so won?t get back to you for a while. The guy I bought it from said ?It used to charge.....?. .. however since I bought it... the amp meter has never moved.... and after many starts the batteries need to be charged so I?m pretty sure it?s not charging. Thanks again for the excellent info!!!
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top