840 wheel loader problems
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=17043
Printed Date: 18 Jul 2025 at 2:31am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 840 wheel loader problems
Posted By: Bill1472
Subject: 840 wheel loader problems
Date Posted: 23 Aug 2010 at 8:13am
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I have an 840 Wheel loader that just lost all hydrolics, i was reversing and got about 20ft then nothing at all, the engine sound changed and i have no sterring, lift or forward/reverse, what could the problem be, have plenty of fluid.
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Replies:
Posted By: kip in cny
Date Posted: 23 Aug 2010 at 8:51pm
I would start with the pump to see if its working ? Make sure your filters are not pluged. Let us know if the pump is working ? I dont understand why it wont move I thought they were tourq converter drive That should be a diffrent system.
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160 CA 920diesel 5020 HD-3
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Posted By: Dnoym N. S. Can.
Date Posted: 23 Aug 2010 at 9:15pm
i think
they were tourq converter drive
but i think the clutch are apply
with the hydrolic pump
hth B:-) Dnoym
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Posted By: Bill1472
Date Posted: 24 Aug 2010 at 9:08am
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both pumps were working fine before everything went bad, checked all fluids and filters, both hydrolics and trans filter, the transmission system is a torque converter drive and uses different fliud, this leads me to belive that whatever drives both pumps and the torque converter is broken? am i on the right path here, the motor all of a sudden sounded different like it wasn't under any load, any infomation would be great
Bill
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Posted By: kip in cny
Date Posted: 24 Aug 2010 at 6:54pm
Are the pumps working now is the question ? You may of broken the flex plate off the fly wheel ? I dont have a 840 I dont realy have a idea of the set up they use.
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160 CA 920diesel 5020 HD-3
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Posted By: jrjuday
Date Posted: 24 Aug 2010 at 8:29pm
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bill, where are the pumps located on an 840? If they are mounted to the timing cover, the splines may have stripped on the shaft.
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Posted By: Bill1472
Date Posted: 24 Aug 2010 at 8:38pm
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the pumps are on the flywheel end of the motor, left side does the steering, right side controls the bucket and the center (internal) is the torque converter, all three stopped working at the same time and the sound of the motor changed, like is was no longer under load?
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Posted By: Bill1472
Date Posted: 31 Aug 2010 at 8:05pm
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Soooooooooo....... I just pulled the motor and the ring gear that is bolted to the fly wheel ( the fiber type one) was broken and all the bolts were sheared off, 6 looked like old damage and 2 looked new, the ring gear drives the torque converter and then the other two pumps, my question is what could have caused this and where can i buy a new ring gear?
Bill
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Posted By: kip in cny
Date Posted: 31 Aug 2010 at 8:55pm
well someone was beating on the loader shifting forward to rev with out stoping at some point in its life. What motor is in that ? Is the fly wheel beat up or are the bolts broke off in the fly wheel. If its in good shape just use left handed drill bits and pull the bolts and have it turned.
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160 CA 920diesel 5020 HD-3
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Posted By: Bill1472
Date Posted: 01 Sep 2010 at 6:46am
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the loader hasnt been worked hard but the forward reverse thing might have happene once or twice, the flywheel looks real good just the seperate ring gear that is bolted to it, i will get a pic and post later today,
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Posted By: Bill1472
Date Posted: 01 Sep 2010 at 6:46am
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the motor is a perkins 4cyl diesel
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Posted By: Coke-in-MN
Date Posted: 01 Sep 2010 at 7:45am
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Try Minnpar in MN for new / do lookup in Rock and Dirt for used or just web search .
Also Thill Tractor Eau Claire WI may be of help.
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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."
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Posted By: Bill1472
Date Posted: 01 Sep 2010 at 2:13pm
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talked to thill tractor in WI and have the part ordered and on its way, thanks for all your help
Bill
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Posted By: Coke-in-MN
Date Posted: 01 Sep 2010 at 4:13pm
Glad they could help you out , I have had good dealings with them over the years . Deno there, got me the tracks for my FD 5 and the sprockets and rollers , got a HD5 radiator from them that was like new , and the price has been right in my dealings.
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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."
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