Hydraulic log splitter

[buickanddeere]

Look up how many GPM the PT's are, the more GPM, the faster the splitter. Also keep in mind that the GPM is usually at full throttle. If you idle down, it will be slower.

As to electric motors, general rule is 10 amps per HP @ 120v and 5 amps per HP @ 240v. So a true 5HP motor @ 240v should have a FLA rating in the 25ish range. But gotta watch motors. Some are listed as "compressor duty" 5HP motors, and are only 13-15 amps max. If you truly need 5HP, those arent the way to go.

A 3/4hp 110v motor should only be 7-8 amps. Certainly not 30. perhaps given the length of wire, it was up-sized to 10ga to minimize voltage loss, and thus the 30A is needed for that conductor size. Breakers arent meant to protect motors, rather the wiring.

Compressor duty motors are much superior to the average electric motor . The starting torque is higher. The running current is lower and the power factor higher. Due to larger run capacitors. Some differences in the rotor in particular and the stator. The compressor motor is usually more efficient too.

 

[buickanddeere]

The OUT hose should be the same size as the IN hose/port or larger.

However, an adapter will be cheaper to replace.

They were using Faster QD's.[/QUOTE

The suction hose should be larger than the pressure hose to keep th pump from cavitating. There is less delta P on the pump inlet to move the oil.

 

[buickanddeere]

Some more questions . The in and out ports on the valve are 3/4 inch , currently there is a 3/4 inch hose on the in and 5/8 inch on the out port, should I replace the 5/8 inch hose with a 3/4 inch hose? The ydraulic cylinder is 4 inch and 24 inch stroke, bore is 1 1/2 inch and the pt 422 is 8 gpm and 2500 psi Also what kind of quick disconnect does power trac use?

If that is a single stage pump. A 15HP motor will be required if pushing on a log that requires 2500psi. If it's a typical splitter pump with four or one piston dual operation. Approx 4HP will be used if loaded to 2500psi and at 1/4 flow.

 

[ernemats]

There is no separate pump that will be used. The pump off the power trac will be used. It is a 22 hp engine and the flow rate is 8 gpm at 2500 lbs. All I will have to do is hook the hoses up to the existing connections that are used to power the hydraulic motor on the mower. If you are not familiar with power trac go to their web site power-trac.com

 

[LD1]

Compressor duty motors are much superior to the average electric motor . The starting torque is higher. The running current is lower and the power factor higher. Due to larger run capacitors. Some differences in the rotor in particular and the stator. The compressor motor is usually more efficient too.

Sure the running amps are lower, cause they dont make even close to the nameplate HP. Its a sham. Similar to the lawsuits over pushmowers.

Its easy math. 5hp is 3730 watts. If you are lucky and have true 240 power, thats 15.5amps not counting efficiency and all. A TRUE 5hp motor will have a FLA rating over 20.

A compressor duty motor with a 13a nameplate rating and a 1.0 SF isnt going to last very long actually doing 5hp of work.

A 5hp compressor motor certainly isnt "superior" to actual 5hp motor if indeed 5hp is what is required. Most true 3hp motors will do more work and last longer than a 5HP comp. Duty.

As to being more efficient, thats cause they arent close to the nameplate HP. Thats like using a 20hp motor to do a job a 5hp could do, and saying that the 20hp motor isnt as efficient.....duh

 

[J_J]

The OUT hose should be the same size as the IN hose/port or larger.

However, an adapter will be cheaper to replace.

They were using Faster QD's.[/QUOTE

The suction hose should be larger than the pressure hose to keep th pump from cavitating. There is less delta P on the pump inlet to move the oil.

The question was for the valve hoses, not pump

 

[Marks481]

A 5hp compressor motor certainly isnt "superior" to actual 5hp motor if indeed 5hp is what is required. Most true 3hp motors will do more work and last longer than a 5HP comp. Duty.

I would argue that a Leeson 5 hp compressor duty motor is superior to a Leeson general purpose 5 hp motor, and that both are truly rated for 5 hp.

http://www.leeson.com/Products/products/ACMotors/1Phase/documents/CompressorDuty.pdf

I would also agree that the typical motor labelled "compressor duty" found on top of a box store 60 gallon air compressor is far inferior to either of the above, and the only thing that makes it "compressor duty" is the heavy duty label that is glued in place.

A TRUE 5hp motor will have a FLA rating over 20.

My Quincy has a 5HP Baldor motor, rated at 21 amps, 240V. No arguing with physics and electricity.

 

[LD1]

I would argue that a Leeson 5 hp compressor duty motor is superior to a Leeson general purpose 5 hp motor, and that both are truly rated for 5 hp.

http://www.leeson.com/Products/products/ACMotors/1Phase/documents/CompressorDuty.pdf

I would also agree that the typical motor labelled "compressor duty" found on top of a box store 60 gallon air compressor is far inferior to either of the above, and the only thing that makes it "compressor duty" is the heavy duty label that is glued in place.


My Quincy has a 5HP Baldor motor, rated at 21 amps, 240V. No arguing with physics and electricity.

Yea, the leesons are a bit different. Their compressor duty motors due indeed pull enough amps to be a 5hp.

My comments were directed towards the box-store units as you mention. I have two 5hp compressor motors. One is 15 FLA and the other is 13 FLA. Neither is a true 5HP motor.

 

[ernemats]

I got the right quick attach fittings for the hoses to attach to the power trac on finally. The problem now is that the other day I was going up a hill and the power trac quit going forward, engine was running fine but the pt just would not move. I talked to Terry and he felt it was the shaft to the pump, which when I got to working on it it was. The lovejoy coupler keyway was broken where the set screw went into it and it wore the key and also wore the shaft where the key was, so now I guess I will send it down to power trac to have the shaft replaced and a new lovejoy$$$$$.

 

[woodlandfarms]

So I am speaking with zero expreince, but I think you might be able to take it to a machine shop and have a keyway put in on the other side. I doubt it would be too much money.... And the lovejoy is just a off the shelf part.

 

[SpringHollow]

What he said

 

[cqaigy2]

So I am speaking with zero expreince, but I think you might be able to take it to a machine shop and have a keyway put in on the other side. I doubt it would be too much money.... And the lovejoy is just a off the shelf part.

Ditto on the zero exp.

Also, i've seen some "lower speed" implementations where a bolt is threaded thru the shaft to the other side, using a nut or two to cinch things up.

 

[SwampmanLA]

I am thinking of building a light duty log splitter to run off my 422 PTO. I found a 3" cylinder that I think will work and the math tells me that the cylinder will have 8.5 tons of force at 2500 psi. A couple of questions for long time log splitter users: Will a 8.5 ton splitter work ok for light duty use? Is my math correct?

 

[SpringHollow]

I am thinking of building a light duty log splitter to run off my 422 PTO. I found a 3" cylinder that I think will work and the math tells me that the cylinder will have 8.5 tons of force at 2500 psi. A couple of questions for long time log splitter users: Will a 8.5 ton splitter work ok for light duty use? Is my math correct?

3" cylinder with a 1.25" rod would have a force of 8.5 tons

Ken

 

[L355SS]

I am thinking of building a light duty log splitter to run off my 422 PTO. I found a 3" cylinder that I think will work and the math tells me that the cylinder will have 8.5 tons of force at 2500 psi. A couple of questions for long time log splitter users: Will a 8.5 ton splitter work ok for light duty use? Is my math correct?

If its from your parts pile then use it. I had good results with a 3.5 cylinder. Most homeowners don't need those big ton splitters.
Dennis

 

[ernemats]

Last week I finally got my 422 back together and running. I had a machine shop cut a new key way in the shaft and I ended up getting the love joy from Power Trac. I had got one locally but it was the wrong one. Power trac gets the love joy and machines it down some and drill holes in it for the set screws. I hooked it up to the log splitter and used it to split several hickory logs which it split pretty easy will try it some more if it warms up some more as I have not been spending much time outside due to broncitus.

 

[woodlandfarms]

Do you mind me asking what the keyway cost?

 

[ernemats]

Machine shop charged $20. to cut keyway.

 

[ernemats]

It warmed up to about 40 today so I decided to try the splitter out, I had some hickory and ash logs that I had cut last fall and this spring. I hooked the splitter to the pt hydraulics and set the throttle about 1/3 open and started splitting. All the logs split real easy and the pt engine speed never varied on any of the logs , it probably took about 15 minutes to split all the logs. See pictures. The only problem I found is the pressure gauge never moved off zero.

 

[MossRoad]

So you're running off the main PTO and using the valve on the splitter. Nice. Any indication of engine heat with only running at 1/3 throttle?