Spicer Tandem Drive Axles Service Manual D170, D190, and D590 Series - Manual (Page 59)

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Ring Gear
Adjust Ring Gear Position (Backlash)
If the gear pattern shows incorrect face width contact,
change backlash by adjusting the ring gear.
If the pattern is too close to the edge of the tooth toe, move
the ring gear away from the pinion to increase backlash.
1. Loosen the bearing adjuster on the teeth side of
the ring gear several notches.
2. Loosen the opposite adjuster one notch.
3. Return to adjuster on teeth side of ring gear and
tighten adjuster until it contacts the bearing cup.
4. Continue tightening the same adjuster 2 or 3
notches and recheck backlash.
If the pattern is concentrated at the heel (too far up the
tooth), move the ring gear toward the pinion to decrease
backlash.
1. Loosen the bearing adjuster on the teeth side of
the ring gear several notches.
2. Tighten the opposite adjuster one notch.
3. Return to adjuster on teeth side of ring gear and
tighten adjuster until it contacts the bearing cup.
4. Continue tightening the same adjuster 2 or 3
notches and recheck backlash.
Ring Gear