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Hydraulic Fill Cap Vent - Farmall H & M

R

Rein_Quest

Member
Until now all the Farmall I used had the vent cap for filling the hydraulic oil. Now I've seen two that have extra hydraulic equipment and they just have pipe fittings for caps. No vents.

My manual only mentions closing the vent in the section about the remote control (a.k.a. Christmas tree valve).

What was the function of the vent? Other than maybe letting humidity get in?
 
You need a vented cap when using single action hydraulic
cylinders. Close it when switching to double action when using IH
christmas tree valve.

Also, original cap had a filtering element in cap. The original
dipstick had a venting washer on dipstick so that filter (cotton
waste) would not get sucked into pump. Instant pump failure when
that happens.
 
Ah so the H I just bought shouldn't operate a single action because a previous owner just put a pipe cap on it.

I'll have to have another look at it too because I don't remember a dip stick.
 
Say Pete23, would real course brass, looking, shaving's work, in the vent cap, like what we use in the kitchen sink ?
 
(quoted from post at 09:34:02 04/07/18) Ah so the H I just bought shouldn't operate a single action because a previous owner just put a pipe cap on it.

I'll have to have another look at it too because I don't remember a dip stick.
Click to expand...

Most of those dipsticks got lost or were tossed a long time ago. They were mostly just a nuisance.
 
the original cap was vented and the dipstick I am not so sure was standard - anyways I have dipsticks for sale if any body wants one -- 10
bucks plus shipping -- Roy
 
I found a dipstick listed on the H schematic in IHC's MyShed. Must have been original. Though I'm sure there was aftermarket ones made.
 
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