Well finally the pictures. I hope someone can make them out what part the pump is hooked to.
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Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways - Beer in one hand - Blonde in the other - body thoroughly used up, totally worn out and screaming Wooooo Hooooo what a ride".
That's the very common 'bottom of tranny' mounting position, not the high speed cascade housing mount. The pump is bolted directly to that bottom PTO, with a spline sleeve between them. So you probably have the hydraulic tank mounted right behind the cab, suspended between the Case deck rails? The shifter for engaging that bottom PTO is typically behind the forward-N-rev lever. Sound familiar? That's the setup on my 406 for driving the backhoe.
If it's a Case version see earlier post (sounds like it is from your response). Says to disengage before driving. Von or someone else can weigh in on whether that is a must, or just to make sure keep under 2150 rpms (or whatever is quoted) to avoid damage to Case pump..
The speed of the pump is most likely limited more for the protection of cavitation of the pump components at high revs than the higher flow which might also over tax some thing but could be overcome with relief valves. Trying to pull to much fluid into pumps will create a very low input pressure and cavitation will happen. It will result in serious loss of metal surface on parts in the cavitation area in a very short ( hours) time.
The manual warning is to keep your foot off the throtle as the stationary operation would use the hand throtle to give a constant and limited RPM of the pump drive shaft.
Dave
Well another question. I am attempting to hook up a hydraulic circuit from the under mounted Case pump. The flow lines(in and out) were linked with a quick coupler so I split this and routed them in and out through a dual valve to run 2 independent cylinders with lines running accordingly. Here's the question. It appears that there is an in line pressure dump valve on the inlet side and I have narrowed my problem of not having enough power to run the cylinders to a faulty pump or this pressure dump. I really don't understand why this is inline here?????? My valve assembly has a pressure relief set around 1850psi, couldn't this be eliminated even for a short period to check to see if it is indeed the pump defective or the dump valve?
MUD
Are you referring to the pressure dump/relief valve along the left Case rail, inside it, behind the hyd tank? Yep, that is set to some pressure to protect the system, dumping high side back to low side. I wouldn't suggest taking it out. As for a short test, you might get away with it, but the plumbing to do so would be a hassle.
The dump valve is adjustable, and it can also get crud in it. You might try removing the protective cap and adjusting the pressure setting screw (out = lower, and in = higher pressure) a few times to help clean it out. I've done that a few times to get the backhoe pressure back up where it belonged.
Bob,
It really isn't a hassle to bypass mine. I only need 2 caps for 3/4 flared fittings, I already had the elbow piece off to check it out. It sounds as if you have had this bypass issue, have you ever taken the valve apart and rebuilt it or cleaned the inside or do you just adjust the screw on the top right side in and out?????
THanks,
MUD
Nope, I have not had to take mine apart. I simply did some adjustments on it and it stopped bypassing too early. I think it had some crud in it. A bypass (over pressure) valve has to be simple. It's a valve preloaded with a spring, and the adjustment is to spring tension. Should be easy to take apart and clean out.
As yet I have not put a gauge on it to verify the new setting but the backhoe works, still bypasses if I stress it too much, and everything works well. I loaded some logs with it yesterday (up to 2 ft dia by 8 ft)and unloaded them this morning and it was a pleasure to use.
Well I tried the adjusting screw and that seemed to be the trick, although I'm not sure but there is still more adjustment. A hose end blew apart. It seems that the John Deere shop couldn't get the end crimped on right! Thankfully I was still testing this thing and not under a load. I'll try and get hose repaired and put her to the test.
thanks,
MUD
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