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HD11 electrical starting system

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=90188
Printed Date: 01 Jul 2025 at 5:21am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com


Topic: HD11 electrical starting system
Posted By: maccountry
Subject: HD11 electrical starting system
Date Posted: 28 May 2014 at 5:30am
Looking for assistance please .Have an ACHD11 dozer.Hasn't started in 4 years.It was running when it was parked where it is now after a grading job.The batteries were both removed and it was properly winterized with a fully topped up diesel fuel tank with "Stable" in it.There was an occassional intermitant starter problem with it in the last few weeks it was used.The old starter with the original mechanical foot operated metal rod linkage was removed and a starter with a starter button was installed and never electrically wired up . The batteries are in storage and read a low voltage of about 6 volts each.They almost look new but the i.d. markings on them are gone.
As originally factory wired I ask the following questions :
Question : Are the 2 batteries both 6 or 12 volts ?
Question : If they are 6 volt were they wired in series to deliver 12 volts to the starter or
                are they wired in parallel to deliver 6 volts to the starter ?
Question : If they are 12 volts are they wired in series to deliver 24 Volts to the starter 
                are they wired in parallel to deliver 12 volts to the starter ?
Question : Which direction do the batteries get placed in their respective battery
                compartments ( on either side of the operaters seat in the arm rests ) ---
                Right side compartment with + toward the front or rear ?
                Left side compartment with + toward the front or rear ?
As you can tell --- I am not an electrician for heavy equipment.I was given this machine and know it will work and start if I get these questions answered and put the electrical back together .
Its very old and spent most of its life in a quarry but is now on my property in the mountains .
I would appreciate any ones help that also may have one of these and will assist me.I can be responded to via my regular "E" mail -------   mailto:maccountry22640@yahoo.com" rel="nofollow - maccountry22640@yahoo.com
   Thank you , in advance for your assistance .
             Mac McGrail          Huntly,Virginia
 
 



Replies:
Posted By: DMiller
Date Posted: 28 May 2014 at 8:00am
If the batteries have three caps or 'segments' they are 6 volt, if they have 6 segments or caps they are 12 volt, each cell or segment in a lead acid battery has a 2.2v charge when new so a 6 segment would have 13.2 volts at nominal charge, a 3 segment would have 6.6v.
The tractor in question was built with a 24v start/charge system, the original setup was four 6v batteries in series, two each tied together to make 12v then those paired to two others to make 24v.

I opted to go to two series 31 12v batteries in my Allis wired in series to get 24v for start and charge. If you have six cell batteries that only read 6v trade them in and get new ones as these are done. If you had three cell batteries you should have had four of them.


Posted By: JC-WI
Date Posted: 28 May 2014 at 8:46am
Another thing to watch for, if the 'new' starter that was put in , it might be 12 volt or 24 volt. many converted the 24 volt tractors and machinery to 12 volts to get away from the hassel of dealing with 24 volts.  Maybe the starter has a tag on it that says 12v or 24V ?
 
 Some would have 'fair' batteries in the old machines and drive their truck up along side and hook jumpers across and then go grease and fuel and check oil and then hit the start switch... and then remove jumpers... because they didn't have a working charging system and didn't need it after machine was started.


-------------
He who says there is no evil has already deceived himself
The truth is the truth, sugar coated or not. Trawler II says, "Remember that."


Posted By: DMiller
Date Posted: 28 May 2014 at 10:01am
Good point JC, My old generator is barely putting anything to the batteries, needs to come off but I am working higher rank issues right now. I just put mine on a trickle charger for a few days when away and it is fine when I get back to it, a few starts later it is getting weaker but I don't let it go too long.


Posted By: maccountry
Date Posted: 28 May 2014 at 11:50am
Many thanks to the gentlemen that provided me with exactly what I needed as regards the electrical starting system in my HD11.
Very much appreciated !
                 Mac McGrail



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