Severe Duty/Vocational - 30,000 mi / 48,000 km / 800 hrs / 12 mo (1 yr)
21
Drive Belts
• Refer to Engine Belt Checks on page 88 for maintenance instructions.
• Refer to Fan Belt Tensioner (If So Equipped) on page 88 for maintenance instructions.
Engine Lubrication
• Refer to Engine Lubrication and Filter Intervals on page 57 for maintenance instructions.
Fuel System
• Refer to Fuel Filter on page 77 - Replace
22
Severe Duty/Vocational - 60,000 mi /
96,000 km / 1,600 hrs / 24 mo (2 yrs)
Severe Duty/Vocational - 60,000 mi / 96,000 km / 1,600 hrs / 24 mo (2 yrs)
23
Cooling System
• Refer to Radiator Hoses on page 84 for maintenance instructions.
Crankshaft
• Refer to Crankshaft - Vibration Damper on page 96 for maintenance instructions.
21
Ensure that all maintenance intervals leading up to this point are repeated during this interval prior to the completion of
those listed here.
22
Use of poor quality fuel may require more frequent fuel filter element service.
23
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
46 Y53-1166-1M1 (10/2020)
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