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Spot Welding Machine for hydraulic driven air compressor, want to convert it to gas engine (no PTO availa

Spot Welding Machine for hydraulic driven air compressor, want to convert it to gas engine (no PTO availa

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laser Welding Machine for hydraulic driven air compressor, want to convert it to gas engine (no PTO availa

Welding Automation for hydraulic driven air compressor, want to convert it to gas engine (no PTO availa

Welding Automation for hydraulic driven air compressor, want to convert it to gas engine (no PTO availa

Platform Spot Welding Machine for hydraulic driven air compressor, want to convert it to gas engine (no PTO availa

Platform Spot Welding Machine for hydraulic driven air compressor, want to convert it to gas engine (no PTO availa

hydraulic driven air compressor, want to convert it to gas engine (no PTO availa


Tue, 31 Aug 2021 10:20:41 GMT
i picked up this air compressor for $100 when i bought my bobcat. its a 17.1 gal tank, a quincy QTS-5 V4 pump, and an eaton hydraulic drive with heat exchanger/fan/etc. http://www.ebay.com/itm/Air-Compeess...vip=true&rt=ncI managed to find a belt drive pulley for the pump, but have no clue where to start with looking for a gas drive pulley (or to even find a cheap gas engine to use)its a very nice setup but i don't have any PTO capability to utilize it so i'm weighing my options as to selling the whole deal and picking up a wheelbarrow to mount on the trailer or selling the hydraulic gear and sourcing a gas drive setup.Im not 100% sure how it works with a gas engine as far as stopping the air from pressurizing. electric shuts off obviously and the hydraulic has a controller that reroutes the fluid back into the tank but i can't think of how a gas drive setup would work.Last edited by stancemx6; 10-16-2014 at 12:10 AM.
Reply:http://www.ptoc.cc/?Hydraulic_Pump_A...Diesel_Engineshttp://www.tractorbynet.com/forums/c...as-engine.htmlhttp://www.splitez.com/engine_pump_adapters.htmlhttp://www.rittenhouse.ca/asp/product.asp?PG=2106A place to get started.  Gear reduction seems to be the hangup when adapting small gas motor to PTO driven equipment.  Most likely you'd be looking at a 540 or 1000 PTO hydraulic pump.  http://www.ebay.com/itm/PTO-Tractor-...item2c8eccb387Just throwing some stuff at you, anything is doable WHEN YOU CAN THROW MONEY AT IT"Any day above ground is a good day"http://www.farmersamm.com/
Reply:Just occurred to me...........dunno how much flow is required to run the hyd motor on your compressor.  That changes the equation big time.  Need to know that first I'd imagine.  Ag style hyd pump might not be adequate flow"Any day above ground is a good day"http://www.farmersamm.com/
Replyhydraulic driven air compressor, want to convert it to gas engine (no PTO availaooks like the quincy QTS-5 V4 pump is a good sized one. Almost 20cfm at 100psi.This chart says it's a 5hp turning at 930 rpm. That should give you enough to make choices on pulley size and engine size.I see wheelbarrow compressors for sale used at $250-$350 around here.So if I didn't need 20cfm, I'd just get a nice used wheelbarrow all ready to go.Dave J.Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~ Syncro 350Invertec v250-sThermal Arc 161 and 300MM210DialarcTried being normal once, didn't take....I think it was a Tuesday.
Reply:As a rule of thumb one horse power (electric) will get you 3 CFM. You need to derate a gas engine when compared to an electric motor so for a gas engine figure two HP per 3 CFM. Your compressor is 20 CFM so I would figure around ten horsepower.You may have a hydraulic bypass solenoid on the compressor which would stop the flow of fluid to the pump when the pressure has been satisfied. I dont see an easy way of putting a gas engine on this since you will need sheaves, unloaders on your intake vales on the compressor. It would almost be easier to run a hydraulic pump of a gas engine to run your compressor.
Reply:Originally Posted by gmakraAs a rule of thumb one horse power (electric) will get you 3 CFM. You need to derate a gas engine when compared to an electric motor so for a gas engine figure two HP per 3 CFM. Your compressor is 20 CFM so I would figure around ten horsepower.You may have a hydraulic bypass solenoid on the compressor which would stop the flow of fluid to the pump when the pressure has been satisfied. I dont see an easy way of putting a gas engine on this since you will need sheaves, unloaders on your intake vales on the compressor. It would almost be easier to run a hydraulic pump of a gas engine to run your compressor.
Reply:the hyd motor is an eaton 21306, it calls for 21gpm at 2000psi. all this stuff is going on a trailer and at this point i'm looking for the least expensive option thanks for the help so far guys!
Reply:I have two gas driven Quincy's. One is like the one shown and the other is a High altitude model. The tanks are small and made into the bumper. They are used for continuos flow air and dont shut down until the gas engine stops. If I try to stop air flow, they make an ugly noise. I dont know if the one shown is designed like mine but thats how my Quincy's work.
Reply:I have a quincy that runs all the time... it uses an unloader... so it goes quite when the tank is full. Most of these compressors are rated for a range of CFM depending on the HP and RPM driving them. You need to start with the compressor head specs and work backwards to the motor. You'll need a large flywheel pulley on the compressor because the gas motor will be unhappy without it. Once you've sourced your flywheel pulley matching up the gas motor is a lot easier. The flywheel isn't used when hydraulically driven because hydraulics don't not momentum to keep going.
Reply:Originally Posted by stancemx6the hyd motor is an eaton 21306, it calls for 21gpm at 2000psi. all this stuff is going on a trailer and at this point i'm looking for the least expensive option thanks for the help so far guys!
Reply:Originally Posted by stancemx6i picked up this air compressor for $100 when i bought my bobcat. its a very nice setup but i don't have any PTO capability to utilize it
Reply:Just remove the hydraulics and connect to a motor using a pulley.  I didnt know about the hydraulics and momentum. I learned something todayLast edited by Insaneride; 10-16-2014 at 02:33 PM.
Reply:If you don't feel the need for the 20 CFM, you can go w/ a smaller pulley on a lower HP engine to reduce CFM and lower HP requirement. Personally I would try to get the engine sized for the CFM. Better to have it and not need it.                                               MikeOl' Stonebreaker  "Experience is the name everyone gives to their mistakes"Hobart G-213 portableMiller 175 migMiller thunderbolt ac/dc stick Victor O/A setupMakita chop saw
Reply:yes it was a 06 miller bobcat 250 got for 1500 with 305.9 hours from the same guy. his truck had a PTO so this setup made sense but for $100 i couldn't pass it up. thinking of selling this and just getting a ready to go gas compressor. the stuff on it is worth some decent money from what i can find on the internet. especially being the pump has new heads. i'd spend more on getting this compressor running than just getting a gas compressor to begin with. like i said if it wasnt only $100 i wouldnt have bought it lol anybody want it?
Reply:If it was a 2 stage I would be all over it.
Reply:I doubt you need 21 gpm to run the hyd motor on that compressor. At 21 gpm that motor will be turning 3600 rpm. If you want to drive it first thing you will need to find out is what rpm the compressor needs to turn.Mike
Reply:Originally Posted by 12V71If it was a 2 stage I would be all over it.
Reply:im going by the limited info i can find on the hydraulic motor. idk if it would take less to turn or not. the pulley i found for the compressor is a 11.88" sheave but the pully size for the gas motor is what i was having trouble finding. i will need to source an engine before i can get the pulley so i know what shaft specs i need. my pump is a 4 cylinder pump but only has 2 heads. for the price of a horizontal shaft engine of any substance i can buy a wheelbarrow compressor. id sell this whole setup for $500. the hyd motor alone goes for 300 and change online and im sure the pump is a pretty penny. this is ready to use as well just hook up 2 hoses and power for the fan and your goldenLast edited by stancemx6; 10-16-2014 at 10:27 PM.
Reply:Originally Posted by InsanerideIs this a 2 stage?Stance, I think this bottom pic is similar to yours. It uses a 12" pulley for compressor and a 3-1/2" pulley at the motor. The motor is a CH 18 kohler but no worries about that much HP. The quincy only piggy backs off of the motor. Im no expert on air but I think you could run that off of a Harborfart gas motor. I think you could run off of a regular old 220 volt air compressor motor but again Im no expert.One question; why cant you run the pto input with a horizontal shaft lawnmower engine?  I think most PTO 's run around 540 rpm.One more thing, the quincy in the top pic blows away the bottom pic.
Reply:Thanks Bistineau. The first compressor works better than the second.Stance, the compressor in my second pic uses a 3-1/2" motor pulley. In the chart MDave supplied, it looks like it uses a 5hp electric motor. I thought you would need only half that HP for gas but I may be wrong. It looks like a good setup if you could get the hydraulic motor running. Im assuming you already have the pump and just need a motor to turn it at the PTO input for pump.
Reply:unfortunately i don't have any hydraulic components besides the compressor itself, it would cost more to get this one running in any fashion than it would to get a ready to go gas compressor off craigslist
Reply:Originally Posted by BistineauThe first compressor looks like a two cylinder single stage. One side will be on the intake stroke while the other is on the compression stroke. The next one appears to be a three cylinder two stage unit. The two outside cylinders being the low pressure side, both feeding the center cylinder, which is the high pressure side.

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