need help modify a hydraulic unit

[sundown57]

ok here is the story. I bought an old bobcat skidsteer 610. it has been repowered and some one removed all the hydraulics . so in an effort to get it going i bought a Concentric pump unit. i know it is designed to work as power left and right, power up and float down. Any one know if it can be modified so i can use it to lift the arms up and down under power and curl the bucket both ways under power ?

 

[jenkinsph]

That is a nice power unit but is not what I would use to replace skid steer hydraulics, woefully undersized. I would take this back for a refund.

Buying an old skidsteer with all the hydraulics removed is another huge mistake =pig in a poke in my opinion.

Is there any way you can get the hydraulic parts and pieces that were removed?

 

[sundown57]

thank you much for all the advise . but didn't really answer my question a all .

That is a nice power unit but is not what I would use to replace skid steer hydraulics, woefully undersized. I would take this back for a refund.

Buying an old skidsteer with all the hydraulics removed is another huge mistake =pig in a poke in my opinion.

Is there any way you can get the hydraulic parts and pieces that were removed?

 

[jenkinsph]

You will need to buy the proper valves with float for double acting cylinders and feed it with your new pump. That would be four position spool with lower, center, raise and float for the boom. A three position valve with out float would work for the bucket.

It will take a couple of minutes to raise the boom. After a few cycles you will need to stop and recharge the battery for 4 hours or more.

Like the commercial on tv says, this is a stupid plan. If you want to fix the machine you need to regroup and use an engine driven pump and suitable hydraulics. I would price everything first before buying anything so you know the costs and what is involved. Good luck with this.

 

[sundown57]

thats strange because i have been using it this way for about a year. I have even done jobs with it and it works great. arms move up and down faster then they ever did with the old set up. never had a battery problem with it before. Just used it about 8 hours yesterday replacing and grading a lawn. glad to find out now it won't work. thanks for your help

 

[jenkinsph]

Well go ahead with it then and good luck with it. Not into having a BS discussion here with anyone and won't waste my time with a liar either. You are not fooling anyone here.

 

[roadhunter]

So essentially you are trying to run a skid steer loader off of a battery powered hydraulic pump setup and the battery powered hydraulic pump works faster than the original engine powered setup.

So you had "the old setup" and installed your own new and improved setup instead. Interesting setup. Can't say I've ever seen anyone try that. I'm amazed at the results but I guess that's why you never know until you try.

 

[sundown57]

i don't much like being called a liar either . i never said i had a battery problem. i never asked if any one though this was a good idea or not . i asked . is there a way to get power down on the curl . thats all. here is proof my machine works just fine and i use it regularly . this is a picture of the set up. i also just made a video it in action. working on figuring out how to upload it now .

Well go ahead with it then and good luck with it. Not into having a BS discussion here with anyone and won't waste my time with a liar either. You are not fooling anyone here.

 

[sundown57]

sorry it took so long to upload a video i had to go make it then learn to zip it.

Well go ahead with it then and good luck with it. Not into having a BS discussion here with anyone and won't waste my time with a liar either. You are not fooling anyone here.

 

[/pine]

sorry it took so long to upload a video i had to go make it then learn to zip it.

Sorry you've experienced some less than helpful advice...I can't help with your query but the best way to present a video here is to upload it to youtube and then link to it or imbed it...

Good Luck...

 

[sundown57]

yes i did have it working originally. how ever the Wisconsin engine was no good. the spool valve was gone and there was no way to mount the pump on the new engine i had . so yeah i did the best i could with what i had. it woks great for my needs and i am real please with it . Im not so please with asking if there was a way to make it power down. When i signed up for this site yesterday it said it was a good place to get help. looks like that was a mistake. I will just keep living with float down. I did learn one thing in here tho. never ask for help . so thanks for that. i won't ever make that mistake again .

So essentially you are trying to run a skid steer loader off of a battery powered hydraulic pump setup and the battery powered hydraulic pump works faster than the original engine powered setup.

So you had "the old setup" and installed your own new and improved setup instead. To each thier own.

 

[4570Man]

If you had a spool valve you could easily make it power down. You won't get very far on this site or make any friends with your current attitude.

 

[oldnslo]

Depending on the style of valve you use the answer is yes it will provide power in both directions. Not sure what type of valves you have on the DC unit but you will require a valves to provide pressurized oil to the rod ends of the lower cylinders. Do you have a schematic showing what the valves are in the power unit? Could be 2 ways, 3-ways or 4-ways. Concentric may have an option to bolt additional valves onto this unit. I would suggest contacting a concentric distributor to see what options they offer. This would provide the neatest package with the least plumbing and potential leak points.

 

[4570Man]

That pump isn't putting out any where close to the GPM of the factory pump. The factory pump must have been on its last leg when you got it. What kind of battery are you using? At work we have an electric forklift. The battery pack alone weighs 2600 pounds. I don't think it would provide 8 hours if continues operation. If I unloaded 3 trucks and set around playing cards for the other 7 hours then it might provide 8 hours service.

 

[LD1]

Sorry, I am not gonna be much help either.

How long have you had that setup like that? I dont see it lasting long at all. Rated at 10% duty cycle? And draws 175 amps? And holds only 3 qts of fluid.....

Just looking for long term problems. Not to mention the galvanized water pipe fittings used on your high pressure hydraulics.....:confused2:

those all in one units usually have special manifolds or subplates to adapt to various valves. Have you tried contacting the MFG and asking them this question? Other than that, you can try to remove all their electric manifolds, and get down to just the bare pump/tank/motor. With a pressure and tank port. Go from there and use your own 4-way valving instead of 3 way. But hydraulic stuff aint cheap and I think you would just be wasting your money. I think you are gonna have alot of long term issues, with the 10% rated duty cycle, high amperage draw, and only 3 qts of fluid that you are gonna cook. You really need to take the advice here and look into going back to engine driven hydraulics

 

[farm boy00]

I'm going to have to say go with the tradition way of doing it. Get a gas powered motor and then get a pump and 2 spool valve. I would go to harbor freight get a 22 hp for $800 and get used pump and valve on craigslist for less then $200 usually if on a budget.

I see the electric system as a good temporary but your only going to be able to ask for so much and your already asking that I think. Not trying to be rude but how much did you pay for that. I've seen the cheapest style of those units go for $700. With a few more hundred you could have a proper system.

Don't worry about some of the people. Even TBN has a few people who don't like new ideas. Had a thread a while back about putting a loader on a Jacobson garden tractor. Everyone said it wasn't possible but recommended something even more unlogical

 

[jenkinsph]

yes i did have it working originally. how ever the Wisconsin engine was no good. the spool valve was gone and there was no way to mount the pump on the new engine i had . so yeah i did the best i could with what i had. it woks great for my needs and i am real please with it . Im not so please with asking if there was a way to make it power down. When i signed up for this site yesterday it said it was a good place to get help. looks like that was a mistake. I will just keep living with float down. I did learn one thing in here tho. never ask for help . so thanks for that. i won't ever make that mistake again .

I said the (1.6 gpm @1450psi) pump was woefully underpowered and it is.
I was hoping you could get your money back before you installed the new pump unit you pictured.
I asked you if you could get the hydraulic parts that were missing.
You came back wanting to know specifically about the power down function.
I suggested the two valve types you would need to accomplish this.

I then commented on the battery capacity not being able to keep up. It won't.
You could throw more money into batteries and valves but you still would have a poor system in the end.
Before responding to your thread I looked up the pump unit in question and read the specifications. I know
it will not meet the criteria of a skidsteer hydraulic system.
I said it was a stupid plan. It is, and you would be better off doing this right rather than using this pump kit.

When you came back with it having been installed for a year and works better than the original set up for 8 hours
then I called BS and liar.

I have spent a lot of time trying to help people on this forum but they need to be receptive to help too. You may have felt I was to harsh with the "stupid plan" but I meant to get your attention and stop the bleeding of spending money on parts that would not lead to a good outcome. I had hoped you could recover the approximate $700 on the pump unit and recover the missing parts and get these reconnected.

 

[roadhunter]

yes i did have it working originally. how ever the Wisconsin engine was no good. the spool valve was gone and there was no way to mount the pump on the new engine i had . so yeah i did the best i could with what i had. it woks great for my needs and i am real please with it . Im not so please with asking if there was a way to make it power down. When i signed up for this site yesterday it said it was a good place to get help. looks like that was a mistake. I will just keep living with float down. I did learn one thing in here tho. never ask for help . so thanks for that. i won't ever make that mistake again .

Please relax. Your question has been answered. Ultimately people are trying to tell you that using a battery powered hydraulic pump with a 3 quart capacity (and pulls 175 amps) is not going to be a long term solution to your problem. A skid steer simply needs more hydraulic flow.

As has been mentioned best bet is to go back with a engine powered hydraulic unit as opposed to sinking more money into what is likely a temporary (if it even works at all) solution.

 

[aczlan]

As has been mentioned best bet is to go back with a engine powered hydraulic unit as opposed to sinking more money into what is likely a temporary (if it even works at all) solution.

I would agree.
A hydraulic pump that runs off of the engine can be had for $100ish (here is one for $110: 1.22 cu in DYNAMIC GPF2PC HYD PUMP note that this pump is meant to mount to the engine and be powered through a lovejoy connector)

Here is a valve for $170ish: 3 SPOOL 24 GPM NIMCO OC W/PWR BYD VALVE NO HANDLES it needs a joystick lever (a piece of threaded rod would work) and hoses

I would hook that pump/valve into the original hydraulic fluid tank and then sell that pump to someone who is putting together a snowplow.
It will be a lot faster and your batteries will hold up better.

Aaron Z

 

[jenkinsph]

A week has passed and I was reviewing this thread. Last Sunday morning I received news that my older brother had passed away that morning. In retrospect I should not have been on the internet posting as my nerves were shot.

I apologize for my initial responses, as these were too harsh.

I know that sundown57 is still viewing the site and would hope that he accepts my apology