Farm Equipment - WD 45 Diesel Injector Pump

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WD 45 Diesel Injector Pump

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=186194
Printed Date: 21 Oct 2025 at 11:39am
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Topic: WD 45 Diesel Injector Pump

Posted By: yesmar74
Subject: WD 45 Diesel Injector Pump
Date Posted: 03 Feb 2022 at 8:36am

Hi there, I'm new to this forum but not to AC tractors. First I'd like to say thanks for letting me join your forum. I have a couple of questions about a WD 45 diesel I just bought. The tractor has sat in the weeds for at least 15 years. I've read in a couple of places that before I try to turn the engine over that I should make sure the injector pump is not stuck. # 1- How do I go about that?

# 2- I think I know but would like to conform that this tractor has a 12 volt system , if so what battery does it take?

Thanks in advance from Gary in Indiana

Replies:

Posted By: TedBuiskerN.IL.
Date Posted: 03 Feb 2022 at 9:57am

I need the answer to that same question. The electrical system used two six volt batteries hooked in series to make a 12 voly Positive ground system.

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Most problems can be solved with the proper application of high explosives.

Posted By: SteveM C/IL
Date Posted: 03 Feb 2022 at 10:07am

Think it's been said here before but can't remember. Send ED a pm

Posted By: injpumpEd
Date Posted: 03 Feb 2022 at 10:45am

turn engine by hand with the fan. Parts for those pumps are so hard to find I just cringe every time someone even asks about them lol!

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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!

Posted By: DougG
Date Posted: 03 Feb 2022 at 11:07am

Is there anything that breaks before it takes out the pump ? Like the One Hundred series the pump shaft is smaller at a certain point so it breaks in pump lock up

Posted By: yesmar74
Date Posted: 03 Feb 2022 at 1:36pm

So Ed you're saying, if I can turn the engine over by hand the pump is ok? Or if the pump is stuck I shouldn't be able to turn the engine over?

Posted By: injpumpEd
Date Posted: 03 Feb 2022 at 1:51pm

If pump is stuck, you shouldn't be able to turn it over by hand with the fan. If it is moving still doesn't really mean it will run and not seize later. There is a small key type driving member that drives the pumping plunger, and it is supposed to be what breaks in the event of a seizure. Well, when one of these won't start, and people keep trying and trying, they end up with it snapping the plunger as well, then it is time to find a different usable hyd head. They are very scarce, and when you find one that isn't seized, many times it is worn out. So finding good ones are very tough. There are so many different PSB heads that nobody wants to rebuild them because of all the differences, plus there's only hundreds of them out there, not thousands like other pumps.

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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!

Posted By: TramwayGuy
Date Posted: 03 Feb 2022 at 2:11pm

DO NOT TURN IT AT ALL! No way, no how!

The pump plunger will break if it is stuck!

And will cost dearly if it does.

Take the pump off and send it out to an experienced pump guy; one who knows how to work with AMBAC PSB pumps.

Do not turn it once it is out either!

“ - I think I know but would like to conform that this tractor has a 12 volt system , if so what battery does it take?”

It was designed and built with (2) 6-Volt group 1 batteries in series, for 12 volts. Batteries technology has gotten better. But put the largest capacity batteries you can fit in there.

Posted By: Larry in NC
Date Posted: 03 Feb 2022 at 2:38pm

The system is 12 volt positive ground. I use one 12 volt battery in mine, still positive ground. Without checking, I think the battery is a group 65. Just measure the battery box so you get one that is low enough and buy as many cranking amps as you can.

Posted By: Mikez
Date Posted: 03 Feb 2022 at 5:50pm

welcome to the forum

Posted By: yesmar74
Date Posted: 03 Feb 2022 at 5:56pm

Thanks Mikez
I have a feeling there's a ton of information here that I can use in the future.
I also hope I may contribute some too.

Posted By: groundhog55
Date Posted: 07 Feb 2022 at 1:45pm

Shcied Diesel in Indiana can have the head on the pump rebuilt , but it will take several months to get it back.