Hydraulic oil change on 7040
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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=147953
Printed Date: 31 Oct 2025 at 2:38am
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Topic: Hydraulic oil change on 7040
Posted By: nick121
Subject: Hydraulic oil change on 7040
Date Posted: 26 Feb 2018 at 12:51pm
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Bought a second 7040 Just ordered the 3 filters,. 2 back ones and one for the P.D. How many gallons of fluid does the whole tractor take? Rear end + Trans under seat?
25 gallons should do it I figure
How hard is it to change the rear filter elements? and where are the drain plugs located?
Thanks in advance, and sorry for all the questions
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Replies:
Posted By: tbran
Date Posted: 26 Feb 2018 at 1:26pm
The rear differential elements 70269921 70269922 'belly filters' - you will not loose over a quart of oil pulling them (unless someone has removed the inside trap doors :-( . Screw out the retaining bolts, clean out the nuts welded to the covers and screw the bolts in them and the retaining bolts will push the cover out. PULL THE PLUGS OUT OF THE END OF
THE OLD ELEMENTS AND REINSTALL THEM IN THE NEW ONES. Failure to do so will cause big problems. There are drain plugs visible and yes 25 gallons should do it. The spin on is standard procedure. There is a screen for the georter pump directly behind the pumps accessed by removing the nearly square plate holding it up. 70265382 is the plate # look it up in agcopartsbooks.com
You will not get all the oil out - too many cavities - but enough to do the job you are intending to do. If you are trying to flush out all possible- purge the remote lines and steering lines and cylinder - lower the lift arms as well.
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When told "it's not the money,it's the principle", remember, it's always the money..
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Posted By: Leon B MO
Date Posted: 26 Feb 2018 at 2:33pm
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I'm working on a 7060 right now. I had steering cyl off to rebuild, oil cooler off to test, replaced all cooler and steering lines, drained trans, differential and both final drives, changed all 3 filters. I put 20 galloin it and that wasn't enough. I had to get another 5 gallons. Leon B Mo
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Uncle always said "Fill the back of the shovel and the front will take care of itself".
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Posted By: nick121
Date Posted: 26 Feb 2018 at 5:05pm
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Thanks tbran and Leon B Mo. Doesn't seem too bad then, Have 4 pails of oil so just over 20 gallons, will have to grab another.
Found a huge hole in the exhaust diffuser elbow. Agco wanted $280 so I ordered one of ebay, $120 Canadian with shipping. Hopefully it works ok.
One remote valve seems stuck, going to have to free it up. And the tach isn't working
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Posted By: WD45Diesel57
Date Posted: 27 Feb 2018 at 7:19am
nick121 where abouts are you in Ontario?
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1-B's, 2-C, 2-CA's,2-WF, 1-WC,1-G, 3-WD's, 2-WD45, 1-RC, 1-D17 Diesel, 1-D14, 2-D15,1-D17 row crop,1-D19 gas and All Crop 40,60,66,72,90 and 100
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Posted By: DrAllis
Date Posted: 27 Feb 2018 at 7:20am
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You own two 7040 tractors and must not have an owners manual ??? That would be $$$$ well invested.........
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Posted By: nick121
Date Posted: 27 Feb 2018 at 11:55am
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I Live south of Guelph.. Farm up near owensound
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Posted By: nick121
Date Posted: 27 Feb 2018 at 11:57am
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Yeah Going to order one today or tomorrow. Have the big thick service/repair manual, just never bought the operators yet.
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Posted By: nick121
Date Posted: 28 Feb 2018 at 7:50am
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Ok, So operators manual ordered. One more question, Alternator isn't charging It's a Delco Remy, Agco parts book lists 2 numbers. 1100583 And 1102920 What is the difference?
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Posted By: tbran
Date Posted: 28 Feb 2018 at 8:30am
Year model - amp rating - you are going to have an issue with the third prong which is the off set prong - not the side by side - giving the tach the correct signal possibly as to correct rpm - you will have to select the correct size of pulley and belt groove size to make the tach read correctly. Most later 7040's had Neihoff alternators$$$$... On my 7040 I drilled and tapped for flywheel pickup and procured an 8000 pick up and tach... then went with a 100 amp one wire alternator... todays alternator technology is much better than in the early day whenthey switched from delco to Neihoff due to alternator failures from the delco's...
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When told "it's not the money,it's the principle", remember, it's always the money..
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Posted By: DrAllis
Date Posted: 28 Feb 2018 at 9:14am
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I always said a Delco alternator was very easy to work on. Good thing, because you got to work on them a lot !!
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Posted By: Aurora21
Date Posted: 30 Jun 2025 at 9:05pm
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What do you do if someone has removed the trap door? Left side belly filter the spring loaded door has been removed. Can the filter be i stalled without it?
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Posted By: DrAllis
Date Posted: 30 Jun 2025 at 9:24pm
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The spring loaded doors crossbar seats the filter into the cover. Filter won't filter nothing without the spring and crossbar.
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Posted By: Aurora21
Date Posted: 30 Jun 2025 at 9:25pm
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I was afraid of that. Thank you
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Posted By: Aurora21
Date Posted: 30 Jun 2025 at 9:28pm
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Can the filter housing be pulled out of the frame?
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Posted By: Lynn Marshall
Date Posted: 02 Jul 2025 at 4:09pm
Yes. Three half inch bolts and the front line flange and you can remove the casting. Then the metal cup can come out of the housing. Your other parts should be lying in the housing
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