RE: Hydraulic fluid

[Kneale Brownson <knotnook@traverse.com>]

I believe the original posting on this matter (Re. substitutes for the Audi
version of hydraulic system oils) said he gave his consultant the specs for
Pentosin 7 or else the consultant did a cross reference for Pentosin 7.
Audi replaced Pentosin 7 with Pentosin 11 about a dozen years ago, I
understand, but retained the original oil's Audi part number.  I believe P7
was a petroleum-based oil, while P11 is a synthetic.

One consideration I have not seen raised in this discussion is that the
tractor-spec hydraulic oils frequently are configured for use in systems
where a direct-drive pump turns at engine or PTO speeds that rarely exceed
2000 rpm's.  The pump on an Audi turns at a much higher rate, and I'd be
surprised if the oil's chemistry didn't include something to counter any
detriment that might occur in this case.  The pressures in either case may
be similar, but the Audi application might mean the oil needs something a
tractor's system doesn't.

Kneale Brownson


At 06:03 PM 9/29/99 -0500, Livolsi, Stephane wrote:
>Went to our New Holland dealer here and all they had on the shelf was
>Hydraulic Oil part number M6C59A which is petroleum based, as per the
>label.  I gave the parts guy the part number quoted below M6c34-A-1 and
>they said it cross referenced to the petroleum based oil.  Are my guys
>out of touch or what?
>
>Stephane Livolsi
>180 Yorston St
>Williams Lake, BC, V2G 3Z1
>ph 250-392-2637
>fax 250-392-2693
>
>'86 5KTQ stock (if you don't know what it means, you aren't in the club)
>
>>----------
>>From: 	Steinbru@vnet.ibm.com[SMTP:Steinbru@vnet.ibm.com]
>>Sent: 	September 28, 1999 6:48 PM
>>To: 	conner@cfm.ohio-state.edu; quattro@audifans.com
>>Subject: 	ATF for hydraulic fluid
>>
>>Ref:  Your note of Tue, 28 Sep 1999 21:24:22 -0400
>>
>>Hi again Dave,
>>
>>>Whre do you buy it?
>>>Dave C.
>>>
>>>> Ford spec #M6C34-A--I use this one (~$5.00 a US qt)
>>
>>At the local Ford tractor and farm equipment dealer.
>>He refers to it as mineral brake oil.  The label says
>>Mineral hydraulic oil.
>>
>>The last batch said "New Holland" on it, but the previous
>>were labeled "Ford."   Somehow the faux continental name
>>must've pleased the 5ks (only one that leaks), cause it
>>seems to have slowed.
>>
>>I also recently discovered that it really might not be the
>>rack.  It blows around everwhere on the left side of the
>>engine at the firewall.  Sorta' looks like maybe a hose or
>>fitting somewhere near (on?) the reservoir.  According
>>to the list I checked and the boot was not rotted and
>>was relatively dry.  Wow, wouldn't that be great!
>>
>>I asked the guy to price me a pail (5gal), but he didn't
>>have it in his distributor's book.  I'm due to pick some
>>up --maybe this Saturday.  I'll ask again.  I'd expect
>>about fifty bucks a pail.  I'll also see if I can get a
>>spec sheet and post it.
>>
>>Additional Audi content:
>>When I got stuck while replacing rear wheel bearings, he
>>also helped with the huge internal snap rings I didn't
>>get with the bearings from GPR --appropriate I guess
>>cause I was using a jack under my Farmall Super M as
>>a bearing press....  ;-)
>>--Gary
>>