Adjustment

CENTER STEM ASSEMBLY


Adjustment


TOTAL PRELOAD TORQUE
1. Before inspection and adjustment, drain gear oil.
2. Remove electric controlled couplings. Disassembly.
3. Rotate drive pinion back and forth 2 to 3 times to check for unusual noise and rotation malfunction.





4. Rotate drive pinion at least 20 times to check for smooth operation of the bearing.
5. Measure the total preload, using the preload gauge (A) [SST:
ST3127S000 (J-25765-A)].






NOTE:
Total preload torque = Pinion bearing torque + Side bearing torque
- If measured value is out of the specification, disassemble it to check and adjust each part. Adjust the pinion bearing preload and side bearing preload.
Adjust the pinion bearing preload first, then adjust the side bearing preload.






DRIVE GEAR RUNOUT
1. Remove rear cover. Disassembly.
2. Following the procedure below, install the dummy cover set [SST: KV381096S0 ( -- )] to gear carrier.
a. Temporarily install the bearing guides [SST: KV38109610 ( -- ), KV38109620 ( -- )] to gear carrier.
b. Position the dummy cap spacers [SST: KV38109630 ( -- ), KV38109640 ( -- )] and the angle [SST: KV38109650 ( -- )] to bearing guide.
c. Use rear cover mounting bolts, tighten bolts to the specified torque. Exploded View.
d. Tighten dummy cap spacer mounting bolts evenly to the specified torque.










3. Fit a dial indicator to the drive gear back face.
4. Rotate the drive gear to measure runout.






- If the runout is outside of the repair limit, check drive gear assembly condition; foreign material may be caught between drive gear and center stem, or center stem or drive gear may be deformed, etc.

CAUTION:
Replace drive gear and drive pinion as a set.

TOOTH CONTACT
1. Remove rear cover. Disassembly.
2. Following the procedure below, install the dummy cover set [SST: KV381096S0 ( -- )] to gear carrier.
a. Temporarily install the bearing guides [SST: KV38109610 ( -- ), KV38109620 ( -- )] to gear carrier.
b. Position the dummy cap spacers [SST: KV38109630 ( -- ), KV38109640 ( -- )] and the angle [SST: KV38109650 ( -- )] to bearing guide.
c. Use rear cover mounting bolts, tighten bolts to the specified torque. Exploded View.
d. Tighten dummy cap spacer mounting bolts evenly to the specified torque.










3. Apply red lead to drive gear.

CAUTION:
Apply red lead to both the faces of 3 to 4 gears at 4 locations evenly spaced on drive gear.





4. Rotate drive gear back and forth several times, check drive pinion gear to drive gear tooth contact.

CAUTION:
Check tooth contact on drive side and reverse side.
Tooth Contact Judgment Guide










5. If tooth contact is improperly adjusted, follow the procedure below to adjust the pinion height (dimension X). For selecting adjusting shim, refer to the latest parts information.





- If the tooth contact is near the face (face contact), or near the heel (heel contact), thicken drive pinion gear adjusting shim to move drive pinion closer to drive gear.





- If the tooth contact is near the flank (flank contact), or near the toe (toe contact), thin drive pinion gear adjusting shim to move drive pinion farther from drive gear.

BACKLASH
1. Remove rear cover. Disassembly.
2. Following the procedure below, install the dummy cover set [SST: KV381096S0 ( -- )] to gear carrier.
a. Temporarily install the bearing guides [SST: KV38109610 ( -- ), KV38109620 ( -- )] to gear carrier.
b. Position the dummy cap spacers [SST: KV38109630 ( -- ), KV38109640 ( -- )] and the angle [SST: KV38109650 ( -- )] to bearing guide.
c. Use rear cover mounting bolts, and tighten bolts to the specified torque. Exploded View.
d. Tighten dummy cap spacer mounting bolts evenly to the specified torque.










3. Fit a dial indicator to the drive gear face to measure the backlash.






- If the backlash is outside of the specified value, change the thickness of side bearing adjusting shims.