On this tutorial, we will cover how to make a complete transmission swap on your chipper. The model utilized here is the chipper shredder 2090, but the concept is pretty much the same on all of our chippers. This tutorial serves well if you need to change the clutch, the pulleys or the belts.
First off, tools needed. We will use:
7/16" | 1/2" | 9/16" | 3/4" hex wrench (one of each).
1- Pulley extractor (optional, but handy).
1- Long straight edge (make it at least one foot long).
1- hammer or rubber mullet
1- a piece of hardwood
What you'll need
1- Pulley with 1" tapered hub with 1/4" key
1- Clutch with key.
1- Hex Bolt 3/8" x 1-1/2" NF grade 5. (black)
1- Hex Bolt 3/8" x 1" NC grade 5
2- 3/8" Flat washers
2- 5/16" Flat washers
4- 1/4" x 1" hex bolts grade 5 -black colored (2 are additional in case you need to realign pulley)
Now grab the 3/8 x 1-1/2" Bolt and assemble with a 5/16" flat washer first, and then with a 3/8" flat washer and apply a dab of threadlocker to secure the fastener.
Screw the setup in place.
Tighten with one hand pulling gently on the starting recoil rope and the other with the 9/16" hex wrench in a clockwise manner.
Now onto the rotor shaft. Insert then tapered hub into the pulley. Align the hub unthreaded holes with the pulley holes. Screw in the two bolts and tighten by hand. Do not tighten with tools yet.
Slide the the pulley and hub on the rotor shaft. Align keyways and insert key. If needed, hit the key mildly with a hammer. At this point the pulley should still be able to slide by hand, if not we can use a hammer and a piece of wood to correct position. Align by eye with grooves on the clutch.
Insert the belts. First, make sure that the engine is pushed all the way closest to the rotor shaft. Insert the belts by placing the belt on the clutch grooves first. Then finish off by rotating the pulley and the belt will slip into position by itself. Make sure that your fingers doesn't get pinched between the belts and grooves!
Pull the engine away from the rotor by adjusting the engine bolt in a clockwise manner. Tighten until the belt looks firm. We will apply required belt tension in the next steps.
You will notice that when the engine is being pulled away, it will veer off because of the belt tension that is being applied. To correct, adjust the side bolt in a clockwise manner until the engine is straight.
To make sure the engine is straight, measure the length between the engine base face and the face of the chipper base. On each side . Variation allowed to our specs is 1mm or 0.04".