Every 30,000 mi / 48,000 km
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Drive Axle (Meritor Line Haul / ON HIGHWAY) - Breather
• Check the operation. If the cap doesn't rotate freely, replace. (Refer to Drive Axle - Meritor on page 262 for maintenance
instructions.)
Drum Brakes (All) - Brake Treadle Valve
• Clean the area around the treadle, boot, and mounting plate. Check the pivot and mounting plate for integrity. Check the plunger
boot for cracks. Lubricate roller pin, pivot pin, and plunger (NLGI #2 grease). (Refer to Drum Brake Inspection on page 219 for
maintenance instructions.)
Drum Brakes (All) - Brake Lining
• Inspect: replace as required. (Refer to Drum Brake Inspection on page 219 for maintenance instructions.)
Hub, Drum, and Hubcap - Hubs (non-LMS)
• Check the bearing endplay and adjust as required. (Refer to Wheels on page 271 for maintenance instructions.)
Hub, Drum, and Hubcap - Hub Seals (all)
• Check for leaks: replace as required. (Refer to Wheels on page 271 for maintenance instructions.)
Hub, Drum, and Hubcap - Brake Drums
• Inspect for visible cracks, heat checking, galling or scoring of the braking surface, and for severe corrosion on the outside
surface. Check for out-of-round or oversize condition [0.080 in. (2 mm) more than the original diameter]. Replace as required.
(Refer to Brake System on page 217 for maintenance instructions.)
Main and Auxiliary Transmission - Main and Auxiliary Transmission and Transfer Case
• Check the drain plugs for tightness. (Refer to Transmission Maintenance on page 272 for maintenance instructions.)
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Ensure that all maintenance intervals leading up to this point are repeated during this interval prior to the completion of
those listed here.
MAINTENANCE - Every 30,000 mi / 48,000 km
188 Y53-6076-1D1 (09/20)
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