3rd function hydraulic flow on 3520 for FEL mount PHD

[tuolumne]

My 3520 lists a maxium output of 8.3 GPM for the implement hydraulics. Is this full amount available in the 3rd function lines, or will it have been reduced by fittings, friction etc. The question relates to a good buy available for a hydraulic post hole digger. Bolting this to the FEL and running of 3rd function hydraulics is very appealing. This would allow reversing, and power down if necessary. I'm not convinced it would be any easier to line up the holes being further away, but perhaps.

So, can the 3520 power a 5-15 gpm hydraulic PHD? Does running continous hydraulics pose any problems like overheating the pump? This seems so different from the normal hydraulic pump usage for loader work. I will not need a PHD for quite a while, so if this option passes by I still have plenty of time to make a decision. Has anyone used their 3rd function hydraulics on the FEL for this purpose?

 

[kennyd]

I do not think you will have any trouble with a hydraulic PHD. Your 3rd function should be able to supply the necessary flow all day long to run it!
As far as overheating the pump, remember that it's always pumping fluid weather you using an attachment or not! The added lines from the rear of the tractor all the way to the front can only help cool the fluid.

What kind of deal are you getting?

 

[tuolumne]

Thanks for your reply. This knowledge is very helpful. My opportunity is past, but I will keep this in mind if something comes up in the future.

 

[Tim640]

I'm interested in the same setup for my 4310, but I have a couple questions. If anyone has any thoughts I'd sure appreciate it. Unless I've reached my quota for questions this week?

I'll want to mount a hydraulic PHD to the bucket or possibly to a loader mount bracket. (Not too worried about the mount just yet -- I'll figure that out later)

To power the drill, I think I have two possible sources:

a. the bucket tilt function on my loader? (I don't think I'll need the tilt with the type of setup I'll use)

or
b. the 3rd SCV on the back of the tractor.

I'm not sure what my flow is, at either of these outlets. My manual says this:

Pump Capacity (Main) @ Rated Speed (4310 and 4410) 32.5 L/min (8.6 gpm)
Total Flow of Pumps @ Rated Speed (4310 and 4410) 52.5 L/min (13.9 gpm)

Questions:
1. How does the total flow exceed pump capacity? Does the 13.9 include power steering flow? (And if so why would this total flow matter -- aren't these systems totally independent?)

2. Does anyone know what my flow is at either of the outlets mentioned above (loader tilt, and 3rd SCV)? Is it 8.6 or 13.9 or ???

3. Also, the drill would run continuously when on, but my 3rd SCV control lever as well as the joystick seem to function to activate flow in one direction or another for short bursts (e.g. tilt the bucket or lift the mower deck) --- do I need a different type of control than what I have to allow forward/stop/reverse for the continuous flow need to run something like an auger?

Sorry if these are obvious questions - I assume they've been asked and answered already but I couldn't find this exact information in my search.

 

[dfkrug]

1. How does the total flow exceed pump capacity? Does the 13.9 include power steering flow? (And if so why would this total flow matter -- aren't these systems totally independent?)

2. Does anyone know what my flow is at either of the outlets mentioned above (loader tilt, and 3rd SCV)? Is it 8.6 or 13.9 or ???

3. Also, the drill would run continuously when on, but my 3rd SCV control lever as well as the joystick seem to function to activate flow in one direction or another for short bursts (e.g. tilt the bucket or lift the mower deck) --- do I need a different type of control than what I have to allow forward/stop/reverse for the continuous flow need to run something like an auger?

Your implement pump and PS pump are separate. Tractor makers total
them up for marketing purposes. You only have the 8+ GPM to work with.
(At least JD tells you what the implement pump flow is; you have to dig
thru the service manual on Kiotis to find out.)

You can use your 3rd AUX for continuous flow, but I would use no smaller
than 3/8" hose to connect all the way up front. I use 1/4" hose for my
FEL-mounted mixer, but I run it at idle and only intermittantly. It still
heats the fluid due to the restriction.

BTW, Worksaver makes a nice hyd PHD for CUTs. It comes with FEL
mount brackets and a hyd motor sized for low flow rates. You should
keep the FEL curl function for best PHD control, IMO.