The next step is to drop in the carrier/ring gear unit and do the preliminary spanner nut adjustments.
The carrier unit is removed because it hits a casting line on the inside of the gear case.
Using a die grinder, they clean up the casting line.
Here’s a look inside the case after grinding. Essentially, every case casting, every optional carrier and every ring gear of a different ratio is a different diameter—it is very common for cases to have to be ground to fit different carriers and ratio gears.
Now, the carrier/ring gear assembly is dropped back in, and the technician feels for initial backlash by hand.
Red Loctite is used on the carrier cap bolts, which are then dropped onto the unit.
The technician then snugs them up, but does not torque at this time.
A dial indicator is used to get exact backlash, and it is adjusted by turning the spanner nuts with a spanner wrench.
Seen here, we can tell you just how good these guys are because they achieved the gear manufacturer’s recommended backlash on the first try!
Stay tuned for the last segment of this tech spotlight!