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Power Steering issue
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jpi72 View Drop Down
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Joined: 27 Jul 2019
Location: Hudson, Iowa
Points: 32 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jpi72 Quote  Post ReplyReply Direct Link To This Post Topic: Power Steering issue
    Posted: 31 Dec 2024 at 6:21am
I own an Allis Chalmer forklift (621?).  We are having issue with the power steering when we start in the morning, especially when it is cold.  The steering does not work for a while.  After a few minutes it does work.  This forklift has a lot of d15 parts.  My son thinks it is a relief valve issue.  Do you have any suggestions?  The hydraulic lift works fine when the power steering does not work. 
Joel
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20873 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 31 Dec 2024 at 9:48am
NOT a relief valve issue. The hydraulic/power steering pump is losing its prime when sitting for extended periods of time. Cold weather makes it worse. Do the other hydraulic functions work when the steering doesn't ???    I would bet they are dead too. Is the hydraulic tank FULL ??   Is there a suction filter in the hydraulic tank ?? I still think you have a "worn out pump" scenario.
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ekjdm14 View Drop Down
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Joined: 20 Aug 2024
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Points: 321 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ekjdm14 Quote  Post ReplyReply Direct Link To This Post Posted: 31 Dec 2024 at 11:23am
Originally posted by DrAllis DrAllis wrote:

Do the other hydraulic functions work when the steering doesn't ???    I would bet they are dead too. Is the hydraulic tank FULL ??   Is there a suction filter in the hydraulic tank ?? I still think you have a "worn out pump" scenario.

Originally posted by jpi72 jpi72 wrote:

The hydraulic lift works fine when the power steering does not work. 
Joel

I'd agree it's not going to be a relief valve, but assuming the other hydraulics are working when steering is dead then it's surely less likely to be an issue with losing prime?
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DrAllis View Drop Down
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Points: 20873 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 31 Dec 2024 at 12:26pm
I know nothing about its system. There could be a pump just dedicated for steering and another for implement function. Either way, it sounds like it loses prime.  I see an internet picture of the right side of the engine and there isn't a typical power steering pump that is gear driven on the engine. If your lift works fine, I still think it's a loss of prime to a pump dedicated to the power steering, which might be belt driven ??

Edited by DrAllis - 31 Dec 2024 at 3:12pm
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