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HD6G Weak Hydraulics
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Paul-HD6G Start-up View Drop Down
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Joined: 01 Aug 2021
Location: LaPorte, IN
Points: 13 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Paul-HD6G Start-up Quote  Post ReplyReply Direct Link To This Post Topic: HD6G Weak Hydraulics
    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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Joined: 23 Dec 2020
Location: Utopia
Points: 2726 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Codger Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jan 2026 at 6:25am
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!
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Paul-HD6G Start-up View Drop Down
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Joined: 01 Aug 2021
Location: LaPorte, IN
Points: 13 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Paul-HD6G Start-up Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jan 2026 at 8:22pm
Thanks for the input
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DiyDave View Drop Down
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Joined: 11 Sep 2009
Location: Gambrills, MD
Points: 56005 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DiyDave Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jan 2026 at 8:46pm
Might also be suction leak or plugged strainer, if so equipped...
Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need!
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Paul-HD6G Start-up View Drop Down
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Joined: 01 Aug 2021
Location: LaPorte, IN
Points: 13 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Paul-HD6G Start-up Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jan 2026 at 7:24pm
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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Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 36521 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DMiller Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jan 2026 at 6:37am
Check Applications Associates for Cross to Baldwin as is where I got the kit for my 7G.
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Joined: 23 Dec 2020
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Points: 2726 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Codger Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jan 2026 at 4:24pm
Obsolete in Baldwin but site does give sizes to match up:
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Paul-HD6G Start-up View Drop Down
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Joined: 01 Aug 2021
Location: LaPorte, IN
Points: 13 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Paul-HD6G Start-up Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2026 at 8:04am
Thanks for the recent info.  Very useful.
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Paul-HD6G Start-up View Drop Down
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Joined: 01 Aug 2021
Location: LaPorte, IN
Points: 13 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Paul-HD6G Start-up Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jul 2026 at 8:27pm
I have finally gotten back to work on this HD6G and still not having much luck.  My gut tells me its a problem with the hydraulic pump.  Here's what I've done:
1)  Drained the old hydraulic fluid and replaced with new.  While draining I found a lot of dirt in the tank.  The Suction screen was completely plugged with stuff.
2) I have not been able to find replacement filters from anyone I've tried'
3)  I cleaned out all of the dirt out of the tank prior to refilling.
The hydraulics is still sluggish when bucket is empty particularly after it gets about 1/2 way up.
With the bucket full (with dirt) it does not want to lift it.
I do not hear any unusually noise or sounds when operating.
At idle it will only lift the empty bucket about 1/2 way.  I have to increase the RPM to get a full lift.
I'm thinking I probably damaged the pump by using it with the plugged suction filter.

Any Suggestions on next steps?  I this Hydro pump still repairable?  
Thanks for any and all help and suggestions.
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Joined: 17 Sep 2009
Points: 1131 		Post Options Post Options   Thanks (0) Thanks(0)   Quote gemdozer Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jul 2026 at 9:15am
The hydrolic oil filter kit is 3019695 from my parts manual and it could be the pump but you could recheck the oil streaner condition maybe it could still have metal in lines .
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Joined: 21 Mar 2019
Location: North Carolina
Points: 896 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 8070nc Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jul 2026 at 9:27am
Does it have a oil cooler and is it clean. The cooler you can keep the oil the longer you can run it before it gets slow
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Joined: 17 Sep 2009
Points: 1131 		Post Options Post Options   Thanks (0) Thanks(0)   Quote gemdozer Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jul 2026 at 5:08pm
The  oil hydrolic kit used 2 filter 1 for oil and 1 air filter breather and  and a friend had the same probleme and he change the pump and he had the same probleme and finally it was a inside hose probleme
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Joined: 01 Aug 2021
Location: LaPorte, IN
Points: 13 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Paul-HD6G Start-up Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jul 2026 at 5:22pm
The system does  not have a cooler that I see for the hydraulics
I have tried sourcing the filters through Wix (#CW-522 MP and CW-523 MP), Baldwin (#181 Kit) and Application Associates,  none have been any helping locating the replacement filters.  
Can ... you be more descriptive on the hose issue that your friend had?

thanks
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Joined: 17 Sep 2009
Points: 1131 		Post Options Post Options   Thanks (0) Thanks(0)   Quote gemdozer Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jul 2026 at 8:14pm
My friend is  died a couple years  and you could check oil filter DONALDSON P164270,BALDWIN PT8395,CARQUEST 85500 or you could GOOGLE 3019695 THEY HAVE MORE NUMBER
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Joined: 08 May 2020
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Points: 1891 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Les Kerf Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jul 2026 at 9:36am
Originally posted by Paul-HD6G Start-up Paul-HD6G Start-up wrote:

... 
Can ... you be more descriptive on the hose issue that your friend had?...

Maybe a suction hose collapsing? Confused
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Paul-HD6G Start-up View Drop Down
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Joined: 01 Aug 2021
Location: LaPorte, IN
Points: 13 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Paul-HD6G Start-up Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jul 2026 at 10:16am
Possible... maybe the hose collapsed when the screen was plugged in the suction line. I'll have to figure out how to get access to it.  I think its pretty buried ...
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Joined: 08 May 2020
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Points: 1891 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Les Kerf Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jul 2026 at 2:07pm
Originally posted by Paul-HD6G Start-up Paul-HD6G Start-up wrote:

... I'll have to figure out how to get access to it.  I think its pretty buried ...

If it's anything like an HD5G it is definitely a tight fit to gain access Ouch
Best wishes on your endeavors Smile
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Joined: 27 Sep 2009
Location: lansdale pa.
Points: 542 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dadsdozerhd5b Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jul 2026 at 6:21pm
Should be a hose from tank to metal pipe that runs up along the right side of the machine to another hose that connects it to the pump. Check the pressure at the dump/lift valve that is where the relief valve spring is. It is adjustable. If you can’t get enough pressure for that adjustment then the side plates of the hydraulic pump are probably worn and in need of a rebuild. I think the hd5 and 6 has the same pump. Driven off the front of the engine. I have a parts HD6G with a valve on it if you need parts, pump is gone.
HD5B, HD5G, (2) FARMALL A's, CUB. DO IT RIGHT THE FIRST TIME, IGNORE THE LAUGHTER. FLANNEL IS ALWAYS IN STYLE.
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Paul-HD6G Start-up View Drop Down
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Joined: 01 Aug 2021
Location: LaPorte, IN
Points: 13 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Paul-HD6G Start-up Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jul 2026 at 6:54am
thanks I'll know what to look for
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