HD6G Weak Hydraulics
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=209715
Printed Date: 01 Mar 2026 at 1:10am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: HD6G Weak Hydraulics
Posted By: Paul-HD6G Start-up
Subject: HD6G Weak Hydraulics
Date Posted: 14 Jan 2026 at 7:12pm
I have an HD6G that I'm working harder than its had to work for the last 20 or more years clearing fence rows. We've had this machine for about the last 50 years so I do have a little history with it. The machine sat idle for about 15 years up until about 4 years ago. But I was able to get it started after new batteries and refreshing the fuel. Over the last 4 years I've used it for some small short term projects with no noticeable issues. However, I started using it to push over some trees while clearing an old fence tree line. The longer I use it the weaker the hydraulics become. Can anyone point me in the right direction? I have not been able to locate a new hydraulic filter. I don't have a book on the loader part of the machine so any information would definitely be helpful. Recommended fluid? Filter part number? Any other suggestions..... Thanks for the help
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Replies:
Posted By: Codger
Date Posted: 15 Jan 2026 at 6:25am
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There are a couple of things that come to mind that are very basic in nature. First is fluid parts wear that exacerbates as the fluid/hydraulics warm. Usually you can discern this by the engine needing higher revolutions to accomplish the same repetitive tasks as the system warms. The second is pressure relieving at too low of pressure. One would normally see this hot, or cold. You would need to tap into the system and check/adjust system relief pressure as a starting point. If you cannot surmount system relief pressure by adjustment(s), most likely the main hydraulic pump needs rebuilt, or replaced. ------------- That's All Folks! |
Posted By: Paul-HD6G Start-up
Date Posted: 15 Jan 2026 at 8:22pm
| Thanks for the input |
Posted By: DiyDave
Date Posted: 15 Jan 2026 at 8:46pm
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Might also be suction leak or plugged strainer, if so equipped... ------------- Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need! |
Posted By: Paul-HD6G Start-up
Date Posted: 21 Jan 2026 at 7:24pm
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The weather warmed up a bit today (30 degrees) so I started the HD6G. The hydraulics worked normally even at low RPM. Still no leaking noted. I didn't use it to do any work today but I do have a couple of other questions. The current hydraulic filter is a WIX CW-523-MP. I contacted WIX only to find that that filter was discontinued and obsoleted many years ago. They told me that that filter had never been sold as an individual unit and was always sold as an Allis-Chalmers Hydraulic Kit that contained (1) CW-522-MP and (1) CW-523-MP filter. I'm looking for help in finding a suitable filter replacement. Thanks for the help
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Posted By: DMiller
Date Posted: 22 Jan 2026 at 6:37am
| Check Applications Associates for Cross to Baldwin as is where I got the kit for my 7G. |
Posted By: Codger
Date Posted: 23 Jan 2026 at 4:24pm
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Obsolete in Baldwin but site does give sizes to match up: https://ph.baldwinfilters.com/baldwin/en/product/baldwin-hydraulic-filter-elements/pt181-kit-baldwin?cm_re=Search-_-Flyout-_-Part&se=PT181%20KIT&sr=1" rel="nofollow - https://ph.baldwinfilters.com/baldwin/en/product/baldwin-hydraulic-filter-elements/pt181-kit-baldwin?cm_re=Search-_-Flyout-_-Part&se=PT181%20KIT&sr=1 ------------- That's All Folks! |
Posted By: Paul-HD6G Start-up
Date Posted: 28 Jan 2026 at 8:04am
| Thanks for the recent info. Very useful. |