Every 15,000 mi / 24,000 km / Monthly
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Frame - Fifth Wheel
• Check the kingpin lock and plate for wear and function: lubricate (NLGI #2 grease.) (Refer to Fifth Wheel Monthly Maintenance
on page 251 for maintenance instructions.)
Front Suspension - Spring Pins
• Check for proper function. (Refer to Front Axle and Suspension on page 252 for maintenance instructions.)
Front Suspension U-bolts - U-bolts (OFF HIGHWAY)
• Check the general condition and the tightness of the nuts. Tighten the U- bolts after the first day or two of operation. Then
tighten the nuts to the specified torque value as required. (Refer to Suspension U-Bolts, Grade 8 on page 280 for maintenance
instructions.)
Drive Axle - Vocational (PACCAR) - Axle Assembly
• Check oil level and inspect for leaks. (Refer to Rear Axle Lubrication on page 261 for maintenance instructions.)
• Visually inspect for damage or leaks. (Refer to Rear Axle Lubrication on page 261 for maintenance instructions.)
Drive Axle - Vocational (PACCAR) - Breather
• Check the operation. If the cap doesn't rotate freely, replace. (Refer to Rear Axle Lubrication on page 261 for maintenance
instructions.)
Drive Axle (Meritor City Delivery / OFF HIGHWAY) - Axle Housing
• Check the "cold" fill level at the differential carrier plug for a pinion angle of less than 7 degrees, or at the axle bowl plug for a
pinion angle of greater than 7 degrees. Tighten the plug to 35-50 lb-ft (47-68 N·m.) (Refer to Drive Axle - Meritor on page 262
for maintenance instructions.)
• Visually inspect for damage or leaks. (Refer to Drive Axle - Meritor on page 262 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 15,000 mi / 24,000 km / Monthly
Y53-6076-1D1 (09/20) 181
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