I thought I'd posted a thread on this topic earlier today, and now can't find it....
sorry for the length of the post, please bear with me....
anyway I am working on the hydraulics on my Ariens GT 19 sealing up the leaks, and am at a point of needing/making new hoses.
I got this tractor with one hose completely blown, looked like it may have rubbed thru on the drive shaft.
I had a local shop make me a new one then watched a 2nd (different) hose blow within 15 min of running in the garage on a jack (so the system was under minimal stress, not doing any real "work" at the time) I had "just" gotten all the air bled out of the system, when the 2nd hose blew its pinhole. Considering how rusty the inner metal mesh was on that original blown hose, I figured the rest were not far behind... time for all new hoses.
I have some questions related to hydraulic hoses--some of which I used to know the answers to, back when I worked at the steel mill and had my turn in the hose room--- but have forgotten the answers to.
the original hoses were 1/4" with 3/8" JIC threaded fittings.
that 1st hose I had made at the hose shop, they made that same way as original/ but the fluid hole within the crimp fittings themselves that they used, was about 1/2 the size of the original/ which on the originals, was same diam as the hose itself. Could that smaller passage in the fitting on the replacement hose, possibly have restricted flow enough to jack up pressures "behind" it in the system to cause the 2nd hose to blow? (I am thinking 30 years of age did have something to do with it)
higher pressure = higher temps
Being that the threaded couplers are 3/8 JIC, my buddy who still works at the mill and is getting me a favor done on making me these hoses, used 3/8 hose to go with the 3/8 thread size. (after I had issues installing them the 1st time, he then said they do have 1/4 crimp fittings with 3/8 thread like original, if I'd rather).... I figured bigger hose= more flow volume and = cooler running system... will the larger hose also reduce system pressures? (I am thinking "not," but unsure) the 3/8 fittings for 3/8 hose sure have larger openings WITHIN the fittings, than the fittings on the hose from the hose shop. I know too that parker fittings will not work on a Weatherhead crimper machine, and vise versa the one from the hose shop didn't look like Parker fittings.... not sure what brand they use
I am having to shorten a couple from original due to the 3/8" hose not being as flexible as the 1/4, and not "tucking" into the frame and bending around obstacles as easily and also wanting to hit the driveshaft, or mingle with my new fan. some of the old hoses did seem longer than they needed to be, anyways// and I was wanting to shorten them anyhow from original equip (especially the 2 to the lift cylinder) even if I were to go back with 1/4" hose, to tuck them in and better keep them out of harm's way ... What bearing does length have, on pressure within a system? (I know, too short can be bad too if there is strain/pull on them// but there won't be, in this case)
I am thinking as in electricity, where they tell you to go up one gauge size wire if your circuit is over a certain length, but being as how my longest hose on this setup is about 32" long, that point may be moot... but thought I'd ask anyway... it may do someone else some good, down the road.
I do not care about it being a museum piece and "exact replica of original" as these are hidden by the seat pan anyways and not seen unless the pan is flipped up... I just want it to "work" and NOT leak.
I may have asked this in another thread.
It depends on where you look, interchange info on hydraulic filters for this machine varies. Some cross it over to the same oil filters that my Dodges and jeeps take on their engines; others cross to specific "hydraulic" oil filters in the same respective brands! . The specified fluid on this tractor is motor oil anyway, so what difference (if any) would it make if I used an "oil" filter or a "hydraulic" filter? I have a Fram PH8A on there at the moment, it seemed to work just fine on there, til the 2nd hose blew a pinhole.
Instead of looping the feed hose from the hydro to the control valve like a question mark around the fan, (3/8 hose can't be bent to the same radius as 1/4, and the crimp fitting itself is too rigid to miss interference with the hydro fan) I had him put a 90* crimp fitting on the hydro end of that hose which will allow me to reduce that hose to almost 1/2 its original length) will that 90 on there hurt my feed pressure to the valve? I'm thinking that with the larger ID of the new hoses allowing more volume, that will make up for putting a 90* fitting where there never used to be one....does this sound right?
Oh well/ as long as this tractor sat before I got it, and coming to me with what appears to be the original factory hydraulic filter, running it with new oil for 15 minutes then having to dump the system again to replace the hoses may serve well as a "flush" of the system.... that can't hurt.