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SERIES 638 TRANSFER PUMP

The transfer pump draws fuel from the fuel tank through a cartridge filter and delivers it to the Bosch injector pump. See Figure 27795 . ‪

1.Injector Pump ‪

2.Transfer Pump ‪

Transfer Pump Location

Repair or Replacement of Transfer Pump

To determine if repair is possible or replacement of the transfer pump is necessary, perform the following procedure. See Figure 27233 . ‪

Flowchart for Repair or Replacement of Transfer Pump

Removal of Transfer Pump

Remove transfer pump as follows: ‪

  1. Disconnect fuel inlet and outlet hoses.
  2. Remove two transfer pump mounting nuts.
  3. Remove transfer pump and gasket from cylinder block.

Cleaning of Transfer Pump

Clean transfer pump as follows: ‪

  1. Clean transfer pump and related parts with clean fuel oil.

    To avoid personal injury when blow drying, wear adequate eye protection (safety glasses or face plate) and do not exceed 276 kPa (40 lb/in. 2 ) air pressure. ‪

  2. Dry transfer pump and related parts with compressed air.
Inspection of Transfer Pump

Inspect transfer pump as follows: ‪

  1. Visually check the transfer pump for leaks or cracks.
    1. If any leaks or cracks are found, replace the transfer pump. Refer to section .
    2. If no leaks or cracks are found, proceed with step of inspection.
  2. Visually check the transfer pump linkage for binding or cracks.
    1. If any binding or cracks are found, replace the transfer pump. Refer to section .
    2. If no binding or cracks are found, reuse the transfer pump. Refer to section .

Installation of Transfer Pump

Install transfer pump as follows: ‪

  1. Install transfer pump and a new seal with two nuts to the cylinder block. Torque to 28 N m (21 lb ft).
  2. Connect fuel outlet and inlet hoses.
  3. Run the engine to verify repair.