Bleed the Fuel System

CAUTION:

X9811-UN-23AUG88

If ANY fluid is injected into the skin, it must be surgically removed within a few hours by a doctor familiar with this type of injury or gangrene may result. Doctors unfamiliar with this type of injury may call the Deere & Company Medical Department in Moline, Illinois, or other knowledgeable medical source.

NOTE: Engines with mechanical fuel system have a single fuel filter while electronically controlled engines (DE10 and HPCR fuel systems) have two fuel filters (primary and final). Whenever the fuel system has been opened up for service (lines disconnected or filters removed), it will be necessary to bleed air from the system. On dual fuel filter system, bleed air only from final filter.

Engines with Mechanical and DE10 Fuel Systems

1. 
   RG7947-UN-13NOV97

   Fuel Filter Bleed Screw

   
   RG8013A-UN-15JAN99

   Fuel Pump Primer Lever

   A - Air Bleed Screw

   B - Fuel Pump Primer Lever

   Loosen the air bleed screw (A) two full turns. On DE10 fuel system, loosen only air bleed screw on final fuel filter.

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2. Operate fuel pump primer lever (B) until fuel flow is free from air bubbles.

3. Tighten bleed screw securely, continue operating hand primer until pumping action is not felt.

4. Start engine and check for leaks.

   If engine does not start, it will be necessary to bleed air from fuel system at fuel injection pump or injection nozzles as explained next.

5. 
   CD30771-UN-24SEP99

   Mechanical Injection Pump Fuel Return Line

   
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   DE10 Fuel Return Line

   C - Fuel Return Line Connection

   At Fuel Injection Pump:

   1. Slightly loosen fuel return line connection (C) at fuel injection pump.

   2. Operate fuel pump primer lever until fuel, without air bubbles, flows from fuel return line connection.

   3. Securely tighten return line connection.

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6. 
   RG7725-UN-08JAN97

   Bleed Fuel System at Fuel Injection Nozzles

   At Fuel Injection Nozzles:

   1. Using two open-end wrenches, loosen fuel line connection at injection nozzle.

   2. Crank engine over with starting motor (but do not start engine), until fuel free from bubbles flows out of loosened connection. Retighten connection to 27 N·m (20 lb.-ft.).

   3. Repeat procedure for remaining injection nozzles (if necessary) until all air has been removed from fuel system.

      If engine still will not start, see your authorized servicing dealer or engine distributor.

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4045 and 6068 Engines with HPCR Fuel System (Except 6068HFG/HFS/HFU55)

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RG12220-UN-24MAY02

Final Fuel Filter Bleed Screw

RG12221-UN-24MAY02

Fuel Pump Primer Lever

A - Air Bleed Screw

B - Fuel Pump Primer Lever

CAUTION: High-pressure fluid remaining in fuel lines can cause serious injury. Do not disconnect fuel lines between the high pressure fuel pump and nozzles. Only bleed the fuel system at the fuel filter bleed screw (A).

1. Loosen the air bleed screw (A) two full turns on final filter base only.

2. Operate fuel supply pump primer lever (B) until fuel flow is free from air bubbles.

3. Tighten bleed screw securely. Continue operating primer until pumping action is not felt.

4. Start engine and check for leaks.

   If engine will not start, repeat steps 1-4.

6068HFG55, 6068HFS55, and 6068HFU55 Engines

CD31453-UN-26APR13

Fuel System on 6068HFG/HFS/HFU55 Engines

NOTE: The fuel system is self-priming and self-bleeding, and does not require a bleeding procedure by the operator.

If engine will not start after filter change, turn ignition key ON for 60 seconds to prime the fuel system. It may be necessary to turn the key OFF and ON again to reprime the system before starting.