455G loader hydraulic pump

[jhubert]

Anyone know what brand hydraulic pump should be on my machine? And a good place to have it rebuilt besides dealer who is gonna send it out and mark it up? thanks.

Could the moderator please move this to a suitable location? Sorry!

[jhubert]

I should've started with this post so here is my end goal. I have some very steep pasture area, maybe 5 acres or so that is actually pretty smooth underneath but grown up with sticker bushes and sumacs up to maybe 4" in diameter. I do not own a tractor I would trust on this hillside and at the bottom of it is a vertical wall thats probly 10' high and drops onto the road. I would like to build a brush hog to pin on the loader arms that is hydraulically (sp?) powered and would run off my clam bucket function which is there just plugged since I have a gp bucket. So far I have acquired a gas mig welder, some general formulas, and I larger desire to reclaim the land. I've gotten several different answers on my machine's pump flow and pressure settings. And it seems a bit loud at the moment so I was going to start with testing/replacing it. Anyone care to share their experiences?

[Lavoy]

A service manual for a 450 with loader should have flow specs and pressure, but my guess is you will be drastically short on both to run a mower. If you had or could find a PTO unit, then a trailing mower would work well.
Lavoy

[Tigerhaze]

The 2010 crawler loaders (the predecessor of the straight 450) uses a 23 gpm hydraulic pump to run the loader system. I am not sure how much of that flow is diverted when using the multipurpose bucket (clamshell). There are a number of threads in the archive on here about flow divertor valves and hydraulic pump capacities if you search for them.

You might be able to hook up to a skid steer brush hog- I think minimum capacity to run smaller sizes of those is around 12 gpm. I frequent another site dedicated to skid steers so could ask them if you would like.

[jhubert]

I realy wanted to have a deck wide enough to mow its track width or more and came across a great condition ten foot dual spindle deck without guts in it for under 300 bucks. Couldnt pass it up. I am told you want around 5hp per foot of cut for a brush hog so I need to select a motor making around 50hp. Anyone have a technical manual for my machine? TM1403 is the one I need. Deere wants 370 bucks. One on ebay for 175.

[jhubert]

If you had or could find a PTO unit, then a trailing mower would work well.
Lavoy

If I were to go this route Im assuming I couldnt just use the "powershaft" since theres no clutch/engagment. I searched a bit for 455's with pto and didnt find hardly anything. What I did find was an earlier model maybe C era and it doesnt look like my machine at all.

[jhubert]

I got my new tech manual and it says a 455G should put out 2600psi at 2100rpm and flow 31gpm. Thats with no mention of the engine change made mid-run. Mine is the earlier engine 4045T and if you look in the drain/refill section of my book it mentions the engine oil went from 9qt to 15qt during the engine change but the hyd res stayed at 10gal. I remember reading that a res should hold about 1 gal per gpm of the system. I guess jd didnt use those parameters! Im now thinking maybe the power beyond is where I could get the most flow from seeing as how the backhoe has big cylinders to fill like the loader on the front. Anyone know what you get out of that location flow-wise?

[KenP]

deleted

[Lavoy]

31GPM @ 2600PSI and 65% efficiency will yield 30.6HP, so if you could utilize 100% of flow, you are still drastically short on power. I would also doubt that the aux valve will flow anything close to 31GPM because as Ken said, all it needs to do is open and close a bucket which takes not much flow.
Your other problem would be heat disappation. We used to run some fairly small hyd motors on grain trucks on the drill fills, and they had 20 gallon or higher reservoirs to handle the heat created, and we would only run them maybe 10-15 minutes tops.
Lavoy

[jhubert]

Ok, so if I cant use that line or the powershaft on the rear and a 3pt linkage, could I use power beyond? Thats gotta be a higher flow than the aux clam shell function. I could pin the mower on the arms, move it to the desired height, and then switch to power beyond with a motor valve inplace, switch it on and drive across the mountain? Even with piping loss, if the power beyond has full flow like the loader end of it I gotta be up around 20+gpm?

[jhubert]

I see the heat and small res being a problem but Im ok with using it for ten mins and letting it sit for a half hour. If I do that ten times over a weekend Ill have it all mowed. At a ten foot cut even in first gear your doing something!

[jhubert]

Theres four places that rent bobcats within probly an hour radius from me and most of them do not rent brush cats with them because they used to and people would bring them back twisted up and trashed. Only one of those places rents a tracked skid loader and thats the only machine Id feel comfortable in on that grade. They dont offer a brush cat attachment for rent. Id rather be sitting in an orops then inside an enclosed cab with only one way out so that brings me back to wanting to use my machine.

[jhubert]

Would someone explain to me how the skidsteers have 70-90hp and use hyd wheel motors and hyd cylinders to move their loader arms and still have high flow available additionally? If they are turning that kinda pump why couldnt I give my machine a little turn of the fuel screw and put a larger pump/reservoir on it?

[kedorland]

35 years of engineering improvments.

Kevin

[JWB Contracting]

Well, a G series machine isn't really made for what you want to do from a hydraulic stand point.

Another option is to mount a separate engine driven hydraulic power pack on your hoe hooks. This idea comes from Iron Wolf who built mulching attachments to fit crawler tractors. On an 850J, a 550 HP unit stapped to the back ran the mulcher attachment on the front.