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#1
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Re: Great Dane excavating co.
Got the truck servo hooked up. Pic s above are the hitch locked and unlocked. Didn't try it with truck yet.
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#2
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Re: Great Dane excavating co.
Looks like should work fine. Time for some armchair truckin'
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#3
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Re: Great Dane excavating co.
Almost, it works pretty good. I started taming the excavator rx controls. Before I did that I had to drive up on trailer with the ex, side boards are a must !!! Not much room for touchy controls driving up the neck.
Hey joe , I just sent ya an email about pump if ya have an idea would appreciate it .
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#4
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Re: Great Dane excavating co.
http://youtu.be/ZQ2fhhMkTsY
Here is a video of a problem I'm encountering. The valve center has been established and messed with so it's not drifting because of not being centered. I completely disassembled the cylinder to check piston and shaft seals and replaced with new. When I reattached the cylinder I worked all air out with temporary lines hooked up into glass of oil, then turned on pump to squirt oil out of lines before attaching to make sure air was purged completely from system. I am currently hooking another spare cylinder up to valve to completely eliminate the lines, hard lines, and cylinder in question to see if it does same thing. Trying to trouble shoot everything before tearing apart valve. As that's the last thing I want to do, I've never taken one apart and don't know about seals inside or what sizes let alone having a spare if it isn't damaged and I damage it from removal. In the video you can hear the squealing I'm referring to. I originally thought it was gears between motor and pump but now I'm thinking it is just oil being pumped. When I started it up this morning it was gone but returned. And if I'm getting air sucked into system I would surly think oil would be leaking out also. I have no leaks anywhere, valve, hoses, fittings, cylinder, all dry. What do you guys think? Valve seal? I'll post up again on results of swapping cylinder out to see if it does same.
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#5
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Re: Great Dane excavating co.
I was having a similar problem with the bucket cylinder on my loader and it turned of to be a bad o ring on the piston letting the oil blow by. It wood move but had no power and I had no leaks on the cylinder at that time. Hop this helps
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#6
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Re: Great Dane excavating co.
That's what I was thinking originally, I replaced piston seal and it still does it. In the process of using a different cylinder to see if it does it with that one. I didn't check piston , possibly I made a mistake in the manufacturing of the piston. But when I had it apart I worked the piston in the cylinder and it created a lot of resistance when line was sealed so I think the cylinder is good. ??
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#7
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Re: Great Dane excavating co.
Cooper as a quick guess I would say it's the piston seal or o'ring. Take the cylinder apart and my bet is you'll find the culprit. If it was a valve seal you'd have to push all the oil out of the cylinder back through the valve to the tank. You're not getting that much resistance so it's a short bypass meaning some where in the cylinder.
Also pretty sure it's the bypass valve that's making all the squealing noise too. That's why the pitch changes with speed, it's the volume of oil going through it that resonates the relief spring and ball! Rob |
#8
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Re: Great Dane excavating co.
I had the same issue with my 4200.
it would do the same as yours dose in the video. I spent ages on the valve , centring it and scratching my head. I had a spare new ram , swapped it out and problem gone, stripped old ram and found the seal worn and letting oil flow around it, ram would move but under load it had no power. cheers andy |
#9
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Re: Great Dane excavating co.
Ok I swapped stick cylinder out and used the one I had for the failed dump project. No way was I going to hold that from extending or retracting by hand. And when valve centered I couldn't move it. So thanks for the input guys, I am pretty sure it's not the valve. No on to next thing, maybe I had used the wrong piston to start with. I know I made a few to try and dial in the right size. Not like I could find directions on what diameter piston to make . It's not much but if it's off a few hundredths it may be just what's going on. Not sealing against cylinder inner wall or piston groove. Might even make a double ring piston this time if I have room. I doubt that I would have honed the cylinder too much. Kind of funny thing as I remember adding a couple washers to the end of piston to act as a stop so stick arm didn't bottom out on boom. And was supposta make new one to eliminate washers. Well I am now. Tear apart cylinder again and have to get the calipers out and check what size piston I have in there. I do believe I wrote down dimensions on the is project. Never wrote anything down (that wasn't on dry erase board) when I built dozer, regret that .
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#10
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Re: Great Dane excavating co.
My pump sorta sounds like with no valve movement, but my pressure is set much lower than yours. You're at 350psi, I'm at 252psi.
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#11
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Re: Great Dane excavating co.
Combination of two things I think. Piston is not right size to seal well with ring. And the piston is allowing oil to flow from bolt holding it on, and then between piston id and shaft that piston slides over. Basically the bolt holding it on was loose and those washers are bad. And I m pretty sure I grabbed one of the wrong pistons when assembling.
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#12
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Re: Great Dane excavating co.
Ok put the cylinder back together with original piston, this time I removed the two washers I had on end and replaced with washer with rubber backing. Will prevent any leakage from bolt hole through piston. And it works now!! And to think I was thinking of getting into that valve assembly. Thanks for the input guys, helped a lot!!!
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#13
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Re: Great Dane excavating co.
Quote:
Nice Job on the excavator, for some reason I can't find any pictures of the completed Model? Guess I need to go back through your posts. |
#14
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Re: Great Dane excavating co.
Haven't had any stupid animal pics lately so,,,,
I don't think I impressed these two worthless clowns, only reason they came out to garage is wife is away and it's feeding time. !!!!!!
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#15
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Re: Great Dane excavating co.
Cool I'm glad you got it fixed so we can see some good vids that shovel looks amazing by the way good job
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#16
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Re: Great Dane excavating co.
Thanks, I'm tempted to go get a skidsteer scoop of screenings and dump in garage floor. Snow on ground again and weather looks to be cold again . I need that material for placing under deck anyway. Humm may just be the indoor climate controlled digging experience I need on the new controls.
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#17
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Re: Great Dane excavating co.
I would just put some plastic down and go for it. Then again never mind the plastic and just leave the dirt there for winters to come!!
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#18
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Re: Great Dane excavating co.
Some pics of her done with exception of boom lights and cab lights being hooked up.
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#19
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Re: Great Dane excavating co.
Nice, but we need one more, it sitting on the trailer hooked to the tractor!
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#20
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Re: Great Dane excavating co.
Coming up,,, I'll try and get time tonight to make a video of her working/loading but probably not upload till tomorrow morning. Evenings are really slow for my internet to upload videos. Sometimes at night a 2min video can take an hour!!!
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