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Allis Chalmers Discussion Forum
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Re: wd hyd trans oiling one more time

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willie in mn

05-26-2013 18:59:39

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Stu is right, the seal is a seperate item, should be at input side of trans/hand clutch. Hand clutch is "wet", runs in the same fluid that is in trans.
Allis recommended 20# oil in hydraulic system as modern hydraulic fluids haden't been invented yet. This section also lubes the belt pulley gears, so have to keep filled even if not using hydraulic lift. Filler is the dipstick near foot clutch pedal.
Hand clutch, pto, trans,& diff use 80-90 gear lube. Holds 17 quarts. Structural webs between sections allow lube to level out, but it takes a while. To fill quicker, fill useing both square plugs on trans/diff case inside the left frame rail. Also, pto housing is the lowest point, so any condensation or rain seaping in around shift lever will settle here. In cold weather it will freeze & break out the housing.
Hint- these were originally square headed plugs, hard to get a wrench in there. Use a 12 point socket 1/8 in larger than the square head, & ratchet on extension. 3/4 square takes 7/8 inch 12 point socket. This works on almost all square heads from 3/8 inch on up.

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mark wdnorton

05-26-2013 21:09:26

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 Re: wd hyd trans oiling one more time in reply to willie in mn, 05-26-2013 18:59:39  
Willie- hand clutch is in hydraulic housing seperate from trans. Willie you say allis recommended 20wt or hyd fluid in hyd system and you say 80-90 gear lube in hand clutch ect hand clutch is in tube with hyd pump Stu says theres a seal between trans and tourqe tube when i took it apart there was no seal just a bearing im going to check stu s website for a seal this sure has me puzzled lets get this figured out mark

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Brian G. NY

05-27-2013 06:08:19

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 Re: wd hyd trans oiling one more time in reply to mark wdnorton, 05-26-2013 21:09:26  
Willie is right; differential, transmission and hand clutch share the same oil. Hydraulic system has a separate reservoir.
I would guess someone put this together without a seal at some time in the past.
Stu"s picture and description should help; parts and repair manuals are wonderful things.

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stu (ON)

05-27-2013 05:12:12

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 Re: wd hyd trans oiling one more time in reply to mark wdnorton, 05-26-2013 21:09:26  
Best read this:

Enlarge page as best you can.

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