Service - 90 ST37x Operator’s Manual
As Needed
Adjust Idler Roller Bearings
Adjust idler roller bearings to keep dirt, grass, and
other foreign matter from damaging bearings as
needed when hubs become loose.
1. Release track tension. See “Check Hydraulic
Hoses” on page 75.
2. Remove lug nuts (1) to remove dust cap
retainer (2).
3. Remove dust cap (3).
4. Remove cotter pin (4).
5. Ensure bearings are properly seated by
tightening castle nut (5) to 30-40 ft•lb (40.7-
54.2 N•m) while turning the hub (7).
6. Loosen the castle nut.
7. Hand-tighten the castle nut.
8. Insert the cotter pin into the wheel spindle (6).
9. Bend the legs of the cotter pin over the top of the spindle.
10. Replace dust cap retainer and lug nuts. Tighten lug nuts to 80 ft•lb (108 N•m).
11. Adjust track tension.
IMPORTANT: Do not move the hub after this step is completed.
NOTICE: If hole is visible in slot but cotter pin cannot be inserted, slightly loosen or tighten
castle nut to align slot with hole and insert cotter pin. If hole is not visible in slot, loosen to next
available slot and install cotter pin.
IMPORTANT: The hub should not have noticeable movement when rocked back and forth.
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5
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3
6
7
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