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Old 03-28-2018, 03:08 AM
Kent_323is's Avatar
Kent_323is Kent_323is is offline
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Default Knuckleboom truck: electric motor for hydraulics

I posted awhile ago about my knuckleboom crane that I put on a '51 Int'l truck. The crane is quite useful, particularly inside the shop for odd lifting duties. However, the engine on the Int'l is need of an overhaul, and smokes pretty bad. A wee bit of oil is being consumed....
I had tried making some pipes to route the exhaust out of the shop, and while it helped, there was still a lot of nasty exhaust in the shop... not fun and a safety issue as well.
One option would be to overhaul the truck engine, but not really feeling inclined to dig into that project right now.
I decided instead to convert the pump drive to electric, and disconnect it from the engine all together.
A 3hp electric motor (air compressor duty), some belt reductions, and a switch with a long cord, and I've got an easy to use crane in the shop!
The main pulley is easy to remove so the PTO drive shaft can be re-connected for outdoor use.
Here's a video that shows the conversion:
https://www.youtube.com/watch?v=vK_s942Zpu0

It's still not fast, but still way faster than any other method of lifting in the shop. The electric motor/belt drive probably doesn't allow max lifting potential, but with the boom straight out and partially extended, I was able to lift ~4000 lbs, verified with a crane scale, so that's more than enough for my needs.

Thanks
Kent
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Old 03-28-2018, 04:26 AM
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When it works and it's needed, it's all good.


Nice
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Old 03-28-2018, 08:07 AM
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Having worked with cranes and hoisting equipment most of my career, I can say with some confidence that speed is not necessarily a good thing for crane operation.... There are many examples.....
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Old 03-28-2018, 08:17 AM
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What power plant does the truck have? I assume it is a 345 or 392 gasser. These motors are available fairly cheap used and good running. I would rather do a simple motor swap myself.
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Old 03-28-2018, 09:33 AM
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If the straight 6 a lot of them were used on combines years ago.Usually the trashing assembly is gone before the engine .
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Old 03-28-2018, 11:47 AM
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Kent_323is Kent_323is is offline
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I'm not sure what exact engine is in it. It has the straight six, overhead valve, single carburetor, gasoline engine. It runs good, just that it burns and leaks oil.

An engine swap may well be easier if I could find one cheap and clean running.

Hah, the crane could lift the old engine out for a swap!

Thanks for the ideas,
Kent
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Old 03-28-2018, 04:40 PM
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Probably doubtful finding a 6 to swap in decent condition. Log on over at BinderPlanet.com and ask what the swapability of the 6 to the 8.
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Old 03-28-2018, 05:05 PM
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I'm assuming you don't have detents on those valves. I've done more damage with detents on my loader
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Old 03-28-2018, 05:18 PM
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Looking good

The next step is to get rid of the space robbing truck!
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Old 03-28-2018, 05:35 PM
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Quote:
Originally Posted by Kent_323is View Post
I posted awhile ago about my knuckleboom crane that I put on a '51 Int'l truck. The crane is quite useful, particularly inside the shop for odd lifting duties. However, the engine on the Int'l is need of an overhaul, and smokes pretty bad. A wee bit of oil is being consumed....
I had tried making some pipes to route the exhaust out of the shop, and while it helped, there was still a lot of nasty exhaust in the shop... not fun and a safety issue as well.
One option would be to overhaul the truck engine, but not really feeling inclined to dig into that project right now.
I decided instead to convert the pump drive to electric, and disconnect it from the engine all together.
A 3hp electric motor (air compressor duty), some belt reductions, and a switch with a long cord, and I've got an easy to use crane in the shop!
The main pulley is easy to remove so the PTO drive shaft can be re-connected for outdoor use.
Here's a video that shows the conversion:
https://www.youtube.com/watch?v=vK_s942Zpu0

It's still not fast, but still way faster than any other method of lifting in the shop. The electric motor/belt drive probably doesn't allow max lifting potential, but with the boom straight out and partially extended, I was able to lift ~4000 lbs, verified with a crane scale, so that's more than enough for my needs.

Thanks
Kent
Seems to me that it is just the right speed. Smoother operation that way.
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