Ripped from Rip....
Funny you should ask, 'cause I just did about an hour of chipping yesterday and took these pics while it was still hooked up.
I fabricated the mount like a mini-fork with the QA mount tilted about 30 degrees forward - very important.
I removed the
chipper housing from the trailer it was on and the pulley and belt guard. No modifications, so can put everything back like it was if I want.
The hyd motor is sized for the PT PTO hyd flow & pressure (15 GPM @ 3,100 psi in my case) to run the
chipper disc direct at about 2000 + RPM at full speed. Had a machine shop fabricate the three-sided box-motor mount to shield the flex coupler and line everything up. It used the existing pillowblock bearing bolt holes on the
chipper housing.
Installed a one-way check valve in the loop you can sort of see on the left in the picture so that when you turn the PTO switch off, the disc will still be spinning fast and will turn the motor into a pump until it spins down. The checkvalve allows for this so no damage or shock to the system occurs. This may not really be neccesary since the blades of a mower would do the same thing and the PTO circuit may already allow for this, but the 140 lbs.
chipper disk has so much more momentum that I felt better-safe-then-sorry.
I start with the engine at about 1/4 speed and turn the switch on, then ramp up the engine to full and chip away. I can bog the system a bit sometimes, but it recovers almost instantly. I ramp the throttle down to about the same before turning PTO off, but not sure that matters.
If the wind trys to blow chips back on the tractor, may drape a tarp over front part to reduce clean-up. Took me over 1/2 hour yesterday to blow most of the wood dust out of the engine tub and foot wells.
