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Altec Digger Derrick question

Avery22x36

Registered
I got a very old, 1971 I believe, Altec Digger derrick, it no longer has the digger on it but I am just wanting to use it as a crane to set things up and move heavy items. When I got it, the original pump had been removed from the hydraulic system. I have it here inside and can plug it into shop hydraulics and make the basic functions and winch work fine so I feel pretty good about it. However, I am no hydraulics man and am trying to size a pump for this unit. I would like to make a skid and use a car engine, or other power source to run the hydraulic pump and have the tank and unit all mounted on the skid so I could use it for other applications around the farm. I am sure when it was equipped with the digger that would have required a lot more capacity than just rotate, extend and winch but I have no idea what size of pump to get?

I have a pump that was taken off a working trash truck that is very large, it is probably overkill but I have thought about using it. It has no tag to identify it but it is blue and has a large G in the casting. I have seen the G before but my online search has not found anything. If I knew what it was I could size it in horsepower better to an engine.

If anyone could help or make suggestions, I would really appreciate it.
 

PFT

Subscriber
Last Subscription Date
02/07/2020
If you want to buy a pump, check out Surplus Center in Lincoln Ne. They usually have a good selection of pumps at reasonable prices.
If the hydraulic power source you are testing it with gives a satisfactory speed of operation, just match the pump size to it. Too big of a pump will make the machine too jerky and hard to gently set things in position, too small and it will be slow but gentle.
PT
 

Heins

Subscriber
Last Subscription Date
01/02/2020
Avery22x36, is your pump like this one? Are you sure it is a G and not a C cast on the pump? This pump has a C cast on the end of it for "Commerical Shearing".
 

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Jack Innes

Subscriber
Last Subscription Date
01/17/2020
If you have a tractor with remote hydraulic connections you could just use that & eliminate the need to build the portable unit. Even a small tractor will work but a little slow.

Jack
 

Avery22x36

Registered
Avery22x36, is your pump like this one? Are you sure it is a G and not a C cast on the pump? This pump has a C cast on the end of it for "Commerical Shearing".
Thanks, I never thought it was a C but I believe you are correct.

---------- Post added at 08:35:15 PM ---------- Previous post was at 08:29:43 PM ----------

If you have a tractor with remote hydraulic connections you could just use that & eliminate the need to build the portable unit. Even a small tractor will work but a little slow.

Jack
Thanks Jack, I thought about that, I put a big (much too big) backhoe on a 4010 once, it just barely moved but worked. You could only move one lever at a time or stopped completely. I am getting ready to build a stone house and put a hydraulic motor on a 16 inch radial arm saw so I could safely use it with water so I will be wanting a power unit for that anyway. Thanks
 

Heins

Subscriber
Last Subscription Date
01/02/2020
Here is a picture of a wood splitter I am working on, I am using the hyd system off a truck bed. The pump, tank, and hyd valve are from the truck hoist. It is a large pump with double acting hyd cylinder. It uses 1" hyd hoses. I would think it would be large enough to run your derrick but may be too large to run the hyd motor on your saw. But you could bypass some oil for the saw.

I have a pole digger and it uses a larger pump than the one on the log splitter.

Does your derrick have the hyd hose on it that came from the pump? If so, what size is it?
 

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Heins

Subscriber
Last Subscription Date
01/02/2020
Avery 22x36, tell us about your stone house. Are you sawing limestone rock? Do you use a diamond coated blade?
 

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Avery22x36

Registered
That is some nice stone work! Where is that at? I am doing Kansas Post Rock, its really Greenhorn Limestone, lots of hard fossils but pretty soft, it weighs about 92 pounds a cubic foot. I have not started yet, I got a large wet cement sawblade to try first, then I will experiment with others if that does not work. This was originally a large two story school house that was torn down in the 1950s so my sawing is just retrofitting old stone. I am trying to make it look like an old house when done. Any helpful suggestions are always appreciated. Thanks

---------- Post added at 10:34:16 AM ---------- Previous post was at 10:32:21 AM ----------

The return line was 2 inch and the pressure was one inch. The digger took a lot of volume and the tank on it is about 60 gal.
 

CharlieB

Registered
Can you learn the gallons per minute output of the pump on your shop test rig? That would give you a bench mark for determining if you want less or more oil flow for your hoist.
Bench test your Commercial Shearing pump by feeding it oil as you manually rotate it while counting the revolutions and measuring a quart of oil output. With a little math, you can figure the pump RPM you need to match the gallons per minute flow you decided upon with the test rig.
Note the rotation of the pump. Many rotate the wrong way to direct couple to gasoline engines.
 

Heins

Subscriber
Last Subscription Date
01/02/2020
The stone bridge is between Granada and Walsh CO. There are several in the area, they were built by WPA. They have run concrete around the base to protect them. I would like to see how they cut the blocks and I think they quarried them in the area. I don't know anything about building with rocks, but I like the looks of it. They didn't build that bridge sitting in an air conditioned cab on a back hoe.

The second picture is the bridge and the first is a rock post I saw sell this past fall. I liked the fossils in it.
 

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Heins

Subscriber
Last Subscription Date
01/02/2020
Avery22x36, Here is a pump off a truck that they call a wet kit that I think would be big enough for you. It has a fitting for 1" pressure hose, it is rigged up for air operated but it also has a manual operated slide for the valve. The tag on it says: Muncie Power Products PT# E2XL2772BPRL. It can rotate either direction and I have the hyd oil tank that mounts behind the cab of the truck. It doesn't belong to me but I will sell it to you for $250.
 

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Avery22x36

Registered
The stone bridge is between Granada and Walsh CO. There are several in the area, they were built by WPA. They have run concrete around the base to protect them. I would like to see how they cut the blocks and I think they quarried them in the area. I don't know anything about building with rocks, but I like the looks of it. They didn't build that bridge sitting in an air conditioned cab on a back hoe.

The second picture is the bridge and the first is a rock post I saw sell this past fall. I liked the fossils in it.
I would like to see that, I had a very good college from Walsh who always wanted me to go there with him and my grandfather farmed at Stonington back in the 30s. Hauled a D on the back of a Model A Truck pulling a Case combine from near Dodge City Kans. Those were the days!

---------- Post added at 09:13:10 PM ---------- Previous post was at 09:11:48 PM ----------

I got to get mine off the trash truck out but it looks very much like it.
 

Heins

Subscriber
Last Subscription Date
01/02/2020
This bridge is close to Walsh, they don't use it any more. The west end washed out and they built one arch with concrete. It washed out again so they built a road around it.
 

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