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New to me HD6G_ serial 4082
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Rmdagain View Drop Down
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Joined: 24 Jul 2025
Location: New Mexico
Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Rmdagain Quote  Post ReplyReply Direct Link To This Post Topic: New to me HD6G_ serial 4082
    Posted: 24 Jul 2025 at 1:10pm
All, I would love some help figuring out what year my new to me AC Hd6G serial number 4082 was manufactured?? Does anyone have a free manual or parts listing? Hydraulic diagrams and pressures??

We are attempting to add an external filter as the in tank was destroyed by previous owners. Any help or links would be greatly appreciated.
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Ray54 View Drop Down
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Joined: 22 Nov 2009
Location: Paso Robles, Ca
Points: 4763 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ray54 Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jul 2025 at 2:53pm
I cannot remember the exact years, but HD 6 came on the market before 1960. I want to say 57 or 58. So a very good chance it is pre 1960.

Surplus Center has has screens made to be put in the tank catching the big stuff before it get to the pump. The real fine filter is the last thing in the return line before oil is dumped back in the tank. Just put Surplus Center in any search engine to find them.


Edited by Ray54 - 24 Jul 2025 at 2:58pm
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DiyDave View Drop Down
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Joined: 11 Sep 2009
Location: Gambrills, MD
Points: 54399 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DiyDave Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jul 2025 at 3:27pm
1956, per Wendell's book...Wink
Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need!
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Points: 1072 		Post Options Post Options   Thanks (0) Thanks(0)   Quote gemdozer Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jul 2025 at 8:29pm
The HD6G hydrolic oil filter is 3016079 and the pressure relief valve is properly adjusted when it open at pressure of 1200 to 1250 p.s.i.
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Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Rmdagain Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jul 2025 at 10:31am
Thanks guys this is helpful. I am hopeful someone can help out with a hyd diagram so I can figure out this internal plumbing and locate the right spot for my filtration.
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