Copyright 2019 Discovery Owner's Association, Inc.

Maintenance Schedule

This page includes information from the August, 2001, edition of Freightliner's "KNOWING YOUR CHASSIS". There are many other things in this booklet that are not presented here. I highly recommend that you get one of these booklets from Freightliner. These booklets are also distributed at Freightliner seminars. Some of the information presented here pertains to Freightliner chassis and Cummins engines that are not used in the Discovery. Since we have a lot of non-Discovery owners that browse our site, I have included all the information in the Freightliner table. You should always refer to your owners manual also. SPECIAL NOTE REGARDING INTERVAL FOR CHANGING REAR AXLE FLUID - I corresponded with Glenn Hoops of Freightliner, and he advises that the proper interval is 2 years and not one year as stated in the "KNOWING YOUR CHASSIS" brochure. This is corrected below.

A very important part of ownership is paying close attention to scheduled maintenance items.


  • Check fuel/water separator, drain if necessary
  • Check coolant level daily and at every fuel stop, and add if needed.
  • Check hydraulic fluid reservoir.
  • Check engine oil level daily and at every fuel stop.
  • Check air restriction indicator when refueling. Replace air cleaner element when the indicator reaches 25 inches of vacuum or 2 years, whichever occurs first.
SERVICE ITEM: 1,000 6,000 10,000 15,000 20,000 25,000 50,000
Check front oil-filled wheel bearings and add fluid if necessary. Drain and refill at least once per year. X            
Check air intake system for damage, cracked hoses and loose clamps   X          
Check wheel lug torque the first 50 miles & 500 miles then every 5000 miles   X          
Inspect fan and fran shroud every 12 month or:         X    
Check belt tensioner bearing         X    
Change automatic transmission fluid & filters MD3060, 3000/4000MH after the first 5000 miles and then every: (If you use Dextron III)           X  
Check rear axle lubricant level   X          
Lubricate steering linkage & driveshaft U-joints, air brake camshafts slip yoke and brake linkage   X          
Lubricate front axle king pins the first 5,000 miles, then every 12 months or:             X
Rotate tires if required     X        
Replace fuel water seperator every 12 months or:         X    
Inspect drive belts for tension and condition every 6 months or:   X          
Change rear axle lubricant (Rockwell) every 100,000 miles or 24 months, whichever comes first. Check level every 6000 miles.              
Check coolant condition & protection, hoses & clamps, every 6 months or:   X          
Replace air dryer coalescing filter and desiccant cartridge every 18 months.              
Replace engine coolant every 24 months or 100,000 miles              


The DISCOVERY OWNERS ASSOCIATION, INC, was formed to promote the sharing of information and the camaraderie of fellow Discovery motorhome owners. Membership in the club is limited to owners of Fleetwood Discovery motorhomes.


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