L39 Front & Rear Hydraulic Power

[DLMaine01]

Great looking set up and thanks for the detailed pics.
I'm sooooo jealous!! /forums/images/graemlins/tongue.gif

Dave

 

[JimMorrissey]

Sky,

Those front remotes are nice aren't they....big hose connections for a lot of flow. I'm glad to see that we got the same equipment installed. It's going to be real nice to have the option to quick-attach all kinds of things /forums/images/graemlins/cool.gif

 

[SkyPup]

Jim, I am really impressed with both of the heavy duty front and rear hydraulic remotes.

They can really take advantage of the L39's 23-gallon per minute hydraulic pump output now with those huge hoses. The new joystick is a nice upgrade too.

So how do you like the GST tranny now that you've had some time to get used to it? Personally, I wouldn't have anything else, it is super sweet! /forums/images/graemlins/wink.gif

 

[_RaT_]

Skypup, isn't that flow the total of all 3 pumps? I know on the L48, the flow was as high or higher, but you could not flow much more then about 12 GPM through anyone hose at a time. Muleskinner did mention the pump setup on the L39 was different then the L48, but to run 23 GPM from a single pump would just about stop the engine when used in conjunction with loader operations where the power must split between the pumps and the drive system.

 

[SkyPup]

There are three pumps making up the 23.4 gpm, one specifically for the power steering @ 6gpm, one specifically for the rear BH swivel @ 6gpm, and one for the main FEL circuits pump and all other attached remotes @ 11.4 gpm.

 

[SkyPup]

RaT, all the hydraulic lines from the hydraulic pumps are 3/8" diameter except for manually operated remotes which are 1/2" diameter (huge for a CUT), so I believe the oil flow is limited by the diameter and pressure of the hydraulic tubing. But I would estimate 1/2" @ 2,500 pounds of pressure would flow up to 25-30 gpm.

 

[_RaT_]

I remember my L48 used larger lines for the loader. I believe they were 1/2". It did not make the laoder any faster, if anything it was slower, but then, the cylinders were much bigger then my L3830 and of course, it had considerably higher lift height. The quick coupler on the back to the swing was quite large. I know they say to go up to the next size on quick couplers because of the flow restriction they impose. At any rate, you guys certainly have gotten your L39's well equipped. Its really nice to see folks getting them set up so well. I will have to take a close look someday at a L39 at my dealer. I know even before it came out, the head mechanic there was quite enthusiastic about them.

So where is the other hydraulic pump located? I assume the main pump and power steering pump are housed in the same body. I know a rental yard had an issue with the L35 consistantly breaking the shaft coupling coming off the front of the L35 engine connecting to the 3rd pump. Apparently, that is not where the L39's pump ties in.

 

[MadReferee]

Here are some maximum flow rate specs for pressure lines that I have literature for. There is a big difference between hose and pipe at the smaller diameters.

1/4" hose @ 3.5 gpm
1/4" pipe @ 6.5 gpm

3/8" hose @ 7 gpm
3/8" pipe at 12 gpm

1/2" hose @ 12 gpm
1/2" pipe at 19 gpm

3/4" hose @ 27 gpm
3/4" pipe @ 33 gpm

 

[slowzuki]

All for not boys, she is a fixed displacement pump. It will push that fluid through at whatever gpm the pump is. Small lines will have huge pressure loss and heat up like nobodies business but will move the fluid.

Putting big lines on lets you run continuous flow equipment like augers or front sweepers without unreasonable heating.

 

[SkyPup]

Rat, the rated flow in my L39 manual for the TL1000 loader states 11.1 GPM @max 2770psi using the OEM 3/8" hoses.

The Kubota L39 FEL bucket weighs 420 pounds and I just ordered a 66" ANBO Hydraulic Grappler that weighs 750 pounds to attach to the 1/2" front remotes.

I'll be one happy camper when I get that unit installed!!! /forums/images/graemlins/grin.gif