Every 2000 Hours or Six Years

1. 
   H96438-UN-18MAY10

   
   H97474-UN-30JUL10

   S660 and S670 Radiator Drain (Tier 2/Stage II)

   
   H102523-UN-28JUN11

   S680 and S690 Radiator Drain (Tier 2/Stage II)

   
   H102523-UN-28JUN11

   S660, S670, S680 and S690 Radiator Drain (Interim Tier 4/Stage III B)

   A - Drain

   B - Surge Tank

   Radiator - Open drain (A) to remove coolant from radiator.

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2. Surge Tank - Flush and refill with correct coolant and conditioner (see Cooling System—Draining in Service Engine section and Engine Coolant recommendations given in Fuels and Lubricants section). Check engine coolant level in surge tank (B) with engine cold. Level must be up to ”Max Cold” line.