Severe Duty/Vocational - 180,000 mi / 290,000 km / 5,400 hrs / 36 mo (3 yrs)
25
Open Crankcase Ventilation
• Replace filter and o-ring gaskets when the OCV is serviced..
Severe Duty/Vocational - 300,000
mi / 480,000 km / 9,000 hrs / 36 mo
(3 yrs)
Severe Duty/Vocational - 300,000 mi / 480,000 km / 9,000 hrs / 36 mo (3 yrs)
26
Aftertreatment System
• Refer to Diesel Exhaust Fluid (DEF) Filter on page 92 for maintenance instructions.
Cooling System
• Refer to Replace Coolant Filter on page 84 for maintenance instructions.
Severe Duty/Vocational - 450,000
mi / 725,000 km / 13,500 hrs / 48 mo
(4 yrs)
25
Ensure that all maintenance intervals leading up to this point are repeated during this interval prior to the completion of
those listed here.
26
Ensure that all maintenance intervals leading up to this point are repeated during this interval prior to the completion of
those listed here.
ENGINE MAINTENANCE - Severe Duty/Vocational
48 Y53-1166-1M1 (10/2020)
2
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