Construction and other equipment - Hd11 alternator/generator conversion

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Hd11 alternator/generator conversion

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=13089
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Topic: Hd11 alternator/generator conversion

Posted By: Argo2
Subject: Hd11 alternator/generator conversion
Date Posted: 28 May 2010 at 6:31pm

Wanted to change the positive ground 24 volt generator out to be replaced by a 24 volt delco alternator. Got mounts all made but belt width is a problem so used the pulley from the generator. The problem is that the diameter of the old pulley is to big and with the reduced speed of a diesel can't get the alternator to perform. Has anyone succeeded in changing to an alternator on the HD11? Or does anyone know where I can get a c belt size pulley with a 5/8 id shaft size?

Argo2

Replies:

Posted By: CTuckerNWIL
Date Posted: 28 May 2010 at 10:10pm

Order what you want here. http://www.mcmaster.com/#pulleys-for-belts/=7akovw - http://www.mcmaster.com/#pulleys-for-belts/=7akovw

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Posted By: Coke-in-MN
Date Posted: 28 May 2010 at 10:17pm

On my HD5 I used a cast iron pulley from truck alt, machined it out to fit B width belt.

It was about half the diameter of origonal generator pulley .

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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."

Posted By: Argo2
Date Posted: 28 May 2010 at 11:30pm

What particular truck alternator did you get pulley from?

Posted By: DonBC
Date Posted: 29 May 2010 at 1:45pm

I have a similar problem with the alternator on my D grader. When I posted this question a while ago someone responded that they sell B width sheaves for alternators and someone else said that they split the stamped metal sheave in half and put some washers in between to make it fit a B width belt. I am going to try the later.

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Jack of all trades, master of none

Posted By: Coke-in-MN
Date Posted: 29 May 2010 at 10:51pm

Pulley was from 78 GMC with the 427 or 366 with air comp. Pulley is small diameter with a recess machined into it to attach to alt shaft and allow for nut to fasten to shaft.

It was thick enough and sets forward far enough to allow the larger belt, so belts clear the fan plate on alt.

I believe there is a way to overcome the internal regulator also to excite the stator so it will charge at low RPM. I know on HD5 I have to run engine up to full RPM to get it to kick in but then it will charge at idle after excited.

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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."

Posted By: Argo2
Date Posted: 30 May 2010 at 7:42am

Thanks a bunch. Yes there is a regulator out there that will fix this problem from idle but as yet I have been unable to track down the company and unfortunately I didn't bookmark it when I read about them. I'll post it if I find it again. Thanks though. I will get one of these pulley's for now.

Posted By: DonBC
Date Posted: 30 May 2010 at 12:46pm

If it is an alternator with a built in regulator and you are told that they only need one wire connection they do not work well at low rpm. My D grader was set up this way. I got the adaptor for the two unused terminals on the alternator from an auto parts store. One lead connects to the battery terminal on the alternator and the second lead requires a light gage wire to a terminal that senses your battery voltage such as a key switch. Since my engine is a gas engine I connected it to the ignition terminal of my key switch so that it broke the connection when the key was turned off. I had to install a diode in line to prevent the alternor from back feeding voltage to the coil after the ignition switch was turned off. My alternator now starts charging as soon as the engine starts even if it only running at a slow idle.

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Jack of all trades, master of none