PREVENTIVE MAINTENANCE SCHEDULE 5 5-26 Y53-6077-1B1 (03/17) PREVENTIVE MAINTENANCE (PM) INTERVALS SYSTEM COMPONENT MAINTENANCE TASK Recommended PM Interval I A B C D E Main and auxiliary transmis- sion Main and auxiliary transmission and transfer case Inspect for visible damage, signs of overheating, and leaks. X X Check the drain plugs for tightness. X Mounting Brackets and Fasteners Check the condition of the fasteners and their torque. Tighten to the specified torque value as required. X Oil cooler Clean the fins (air-to-oil type) and body. Check the hose condition and for leaks; replace as required. X Main and aux. transmission Check the oil level; refill as required.
X Main and auxiliary transmission (ON HIGHWAY) Drain lubricant while warm. Flush each unit with clean flushing oil. 500,000 miles/ 800,000 km Main and auxiliary transmission (OFF HIGHWAY) Drain lubricant while warm. Flush each unit with clean flushing oil. X X