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Also I am working on a powered winch that is using a 3.3 cummins and it is a really nice little power pack ant has 60 hp , I may be way off but if this little engine is putting out that much hp I would think that the mep would be in the same range and am willing to bet my money on it. I am going...

If you are going to use the gold wing motor I would mount it underneath the bed and keep the hydraulic systems as is just move the pump. But if you want to mount it and the motor on the rotating boom you can just back feed through the stock setup just use the pressure line that feed the boom to...

Looked at pressure line on wrecker today marked 1 and 1/4" so that and 1350 equals what TobyS?

Okay rereading over the thread ferro listed 18 hp at 1800 rpm as factory recommended for the pump on a 936 and I know 1350 psi so I am going to go out on a limb and said a MEP003A will work and now to figure out how to attach it to the system. Munchies how about it any way to attach a shaft on...

Oh by the way TobyS the pressure is set at 1350 lbs and it's a 2" line. Pressure I believe is fact because someone looked it up the two inch is off the top of a different person's head.

So Munchies I could replace the MEP003A motor with a Honda 20 hp and loose like 300 lbs?

Yeah I think you generator figures are for the civilian gensets, and yes they get testy over GL.

TobyS I think your 50 hp figure will be about right which is why I suggested the MEP003A if I remember right that's about how much that engine puts out. And the pump on the 936 is on the truck but the pump on a 816 is on the crane.

TobyS this is for you the lines on most of the wrecker are 1&1/4 to 1&1/2 in size and that may be underestimated but can get you an accurate size tomorrow as I will be working on one of my wreckers and might even be able to get what pressure they are set for from the guys that actually set them.

I didn't say your math is wrong and didn't wasn't pointing my comments at just you. The crane will not be using any power to hold something while you weld. And no never owned a shop smith but you could use an electrical motor to power the hydraulic systems and use a Welder off of the same APU...

Okay let's stop guessing. I know most of the powered loaders around here use a 4 cylinder so that will get us in the ballpark I know the mep002a is used as a APU on some of the military equipment. Maybe a MEP003A would be a good choice, it could be mounted in place of the spare and part of the...

Ferro can you post the pump model and manufacturer? I can look up specs at the shop.

Dear Ferro not doubting what you say here at all but a where did you find this and would a 20hp fuel burner cover this as well?

Mdmorgan considering that your engine is tore down this far and the problem you had with the cam I would think about doing a complete teardown just to check out all the rest it won't take that much more time and will give you piece of mind later.

But the question is how the pto is driven, is it 1to1 off of the input or does it go through the gears of the transfer case?

Ron doesn't the pto spin at the same as the transfer high range? 939 has overdrive of 1.1 right?

Be willing to bet it is a 1800 rpm pump, mep 002a motor is sounding about right

I had this same problem and had to reload tap talk to get it to work but like you said worked before whatever was done during the rally. As to the 936 guys I am sorry to hear that motor is giving you more trouble. I like the pony motor idea maybe behind the passenger side fuel tank? Wonder...