Dynojet 250: Replacing the Starter Ring Gear - Manual (Page 6)

P/N 98221100 6
Lift the drum assembly as you did in Step 5 of Section 1, and
remove the plywood. Set the drum / frame down, and then tighten
the bearing bolt nuts on both sides to 150 lbs-ft.
Step 5
Replace the bearing lock collars on both sides of the dyno. Be sure
the drum is located EXACTLY in the same location as when you
removed it (reference the measurements you recorded earlier). Set
the lock collars (refer to sticker above bearing), and then tighten
down the set screws to 28 lbs-ft.
Step 6
Bolt the rear frame section back into place. There should be (12)
3/8’ hex bolts with lock washers, torque them to 42lbs-ft. If you are
reinstalling a brake, don’t install bolts in the top and bottom (2)
holes on the left side. If you have a brake continue through the next
5 steps, otherwise skip to Step 10.
Step 7
Mount the rotor / taper lock assembly to the shaft on the back left
side of the dyno. Be sure to install the key to ensure proper
alignment.
Step 8
Attach a dial indicator to the side of the dyno as shown, and check
for run out. The tolerances are +/- .005”. Tighten the taper lock
bolts to adjust the run out, and then torque to 15 ft/#’s. Tighten the
set screw at this point to keep the key in place.