Service Interval Chart—Annual, 1500 Hours, 4500 Hours, 5000 Hours, and 6000 Hours

Item	Annual	1500 Hours	4500 Hours	5000 Hours	6000 Hours
Service Batteries and Connections	•
Test Coolant and Add Coolant Conditioner	•
Check Seat Belts	•
Inspect Primary and Secondary Engine Air Filters	•
Check Triple Link Suspension Plus (TLS™ Plus) Accumulator Charge Pressure1	•
Check Triple Link Suspension Plus (TLS™ Plus) Accumulator Charge Pressure1	•
Change Transmission-Hydraulic Oil		•
Change MFWD Wheel Hub and Axle Housing Oil		•
Lubricate Draft Link Support Shaft Bushing		•
Inspect Belt Tensioner		•
Change Front PTO Housing Oil and Filter (If Equipped)		•
Replace Open Crankcase Ventilation Filter (6.8 L Engine Only)		•
Replace Transmission Drive Shaft Damper1			•
Adjust Engine Valve Clearance1				•
Replace Crankshaft Damper1				•
Drain, Flush, and Refill Engine Cooling System2					•