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7040 hydraulics
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mike-mn View Drop Down
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Joined: 12 Sep 2009
Points: 80 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mike-mn Quote  Post ReplyReply Direct Link To This Post Topic: 7040 hydraulics
    Posted: 18 Jun 2019 at 9:51am
Last fall my 7040 would not run enough standby pressure.  It was around  200.  It also leaks out of where the front cover bolts on the piston pump.  It has leaked around 4 gallons in 3 weeks to a month of sitting.  I checked the compensator for broken parts, but that looked good.  I was going to just take the end of the pump off and reseal it ( do you have to take it off the tractor  first), but was wondering if I need to look at something else to?  I also question if it is leaking from the transmission, which would be orings on the next pump?  Again thanks for any advice.
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MACK View Drop Down
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Joined: 17 Nov 2009
Points: 7664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jun 2019 at 9:05pm
I would add some shims to low pressure compensator. I would pull the pump just to replace the gasket because they tend to leak as they age + all the lines will have to be unhooked any way. Pretty unusual for that gasket to leak.      MACK
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mike-mn View Drop Down
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Points: 80 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mike-mn Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jun 2019 at 9:55am
Does the gasket on the front plate have to be fiber or can I use Permatex?  I changed the filters in the rear end and then it would run at 350 for awhile until I drove it. 
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DrAllis View Drop Down
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Points: 22807 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jun 2019 at 10:06am
Gasket is now a stamped steel gasket !!   Pull all three pumps and get new Orings on the tranny pump to stop it seeping.
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