Drain and Flush Cooling System

NOTE:

TS281-UN-15APR13

CAUTION: Explosive release of fluids from pressurized cooling system can cause serious burns.

Shut off engine. Only remove filler cap when cool enough to touch with bare hands. Slowly loosen cap to first stop to relieve pressure before removing completely.

1. Slowly open the radiator cap.

2. Drain engine coolant according to following procedures:

   1. 
      RG4894-UN-14DEC88

      Engine Block Drain Plug

      A - Engine Block Drain Plug

      3029 Engines

      Remove engine block drain plug (A).

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   2. 
      ZX016192-UN-11JAN99

      Oil Cooler Housing Drain Plug

      B - Oil Cooler Housing Drain Plug

      4045 or 6068 Engines

      Remove oil cooler housing drain plug (B).

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   3. 
      RG13858-UN-17JAN05

      Cooling System Drain Valves

      A - Pump Drain Valve

      B - Block Drain Valve

      6090 Engines

      Open coolant pump drain valve (A) and engine block drain valve (B) on left side of engine. Drain all coolant from engine block.

3. 
   CD30765-UN-27AUG99

   Radiator Drain Valve

   C - Radiator Drain Valve

   Open radiator drain valve (C). Drain all coolant from radiator.

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4. Close all drain orifices after coolant has drained.

5. Fill the cooling system with clean water. Run engine until water passes through the thermostat to stir up possible rust or sediment.

6. Stop engine and immediately drain the water from system before rust and sediment settle.

7. After draining water, close all drain orifices and fill the cooling system with cleaning product such as PMCC2610 or PMCC2638 Cooling System Cleaners available from your John Deere Dealer. Follow manufacturer's directions on label.

8. After cleaning the cooling system, drain cleaner and fill with water to flush the system. Run engine until water passes through the thermostat, then drain out flushing water.

9. Check cooling system hoses for proper condition. Replace as necessary.

10. Close all drain orifices and fill the cooling system with specified coolant (see Diesel Engine Coolant).

    Cooling system capacity
    Engine Model	Cooling system capacity
    3029 Engines	11 L (12 qt.)
    4045 Engines	20 L (21.5 qt.)
    6068 Engines	27 L (29 qt.)
    6090 Engines	36 L (38.5 qt.)

11. 
    CD30643-UN-04MAY98

    Coolant Temperature Sensor

    B - Coolant Temperature Sensor

    When refilling cooling system, loosen temperature sensor (B) or plug at the rear of cylinder head to allow air to escape (except for 6090 engines).

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12. Run engine until it reaches operating temperature then check coolant level and entire cooling system for leaks.