Dynojet 250: Replacing the Starter Ring Gear - Manual (Page 5)

Step 2
Heat the new starter ring until it “grows” enough to fit over the
drum. Be sure the ring is seated at an equal distance around the
perimeter of the drum, and hold it in place until it cools.
Step 3
You may want to prime / paint the new ring gear and the area on the
drum surface where you were working.
Step 4
Roll the drum assembly back into the frame, and be sure the bearing
bolts are still in place through the holes on the inside of the frame.
Install the bearings back on the shaft on both sides of the dyno.
Replace the 5/8” lock washers and nuts, BUT DO NOT TIGHTEN
THEM YET.
P/N 98221100 5
Note: Manually rotate the drum and be sure that it isn’t hitting
anything. At this point, you should also test the starter
and be sure that it is lined up properly and doesn’t bind.
Be sure that the starter ring
gear is lined up with the
bendix on the starter.
Note: You should be able to slide the drum / shaft assembly
back and forth as long as the bearing lock collars are
loose. This will aid in getting the drum assembly back
to its original location.
Note: High Inertia Only: Be sure to replace the additional frame
members before replacing the bearings. Install the (12) 3/8” hex
bolts towards the front of the dyno and torque to 42 lbs-ft.
Additional frame
sections for High
Inertia Dynos only.