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Allis Chalmers HD 21 Dozer torque converter proble
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Shaun View Drop Down
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Joined: 17 Jul 2025
Location: Alberta Canada
Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Shaun Quote  Post ReplyReply Direct Link To This Post Topic: Allis Chalmers HD 21 Dozer torque converter proble
    Posted: 17 Jul 2025 at 5:56pm
I have an early 50s Allis Chalmers HD 21 Dozer with a torque converter issue. The torque converter is the old style which uses diesel for its fluid. The Dozer was working good until parked for several years runs great now but has no push power at all barely moves back and forth under its own weight. I have changed the fuel filters and I know the fuel in the tank is good and clean. If anybody has any ideas of where I can start I would really appreciate it I have looked on the Forum for other postings I am having trouble finding the mentioned restrictor to make the fuel pressure in the torque converter stay above 30 PSI I do not have a fuel pressure gauge if I can share some pictures with someone who can maybe give me a hand locating what I'm looking for I would really appreciate it. Thanks.

Edited by Shaun - 17 Jul 2025 at 5:58pm
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Joined: 17 Sep 2009
Points: 1010 		Post Options Post Options   Thanks (0) Thanks(0)   Quote gemdozer Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jul 2025 at 7:36pm
I am not sure but when these machine ben long time park the fuel tank have to be 75% full for good working. AM NOT A EXPERT
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Shaun View Drop Down
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Joined: 17 Jul 2025
Location: Alberta Canada
Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Shaun Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jul 2025 at 8:14pm
Thank you very much I will try throwing a few more Jerry cans in it and see what happens if it makes a difference
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Shaun View Drop Down
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Joined: 17 Jul 2025
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Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Shaun Quote  Post ReplyReply Direct Link To This Post Posted: 2 hours 20 minutes ago at 10:56pm
Hey guys I tried more diesel and didn't make any difference. When I used to operate the tractor I could be crawling along pushing a load and lift the blade at the end of a hard push while still moving no problem. Now it doesn't barely want to crawl and the blade only lifts when clutch is engaged but not in gear. I should also tell you that it is an old cable lift blade using the rear winch. Any help would be much appreciated
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