3412 Generator Set Engines Caterpillar


Fuel Transfer Pump

Usage:

3412C 4BZ



Illustration 1g00369992

(1) Pump cover assembly and seal

(2) Pump body

Clearance between pump cover assembly and top of gears ... 0.022 to 0.048 mm (0.0009 to 0.0019 inch)

Note: The shaft assembly must rotate freely after the cover's bolts are tight.

(3) 6N-1069 Spring (for relief valve)

Length under test force ... 33.96 mm (1.337 inch)
Test force ... 26 ± 1 N (5.9 ± 0.3 lb)
Free length after test ... 53.52 mm (2.107 inch)
Outside diameter ... 10.31 mm (0.406 inch)

Pressure of fuel to open bypass valve ... 690 + 110 - 0 kPa (100 + 16 - 0 psi)

Fuel flow requirements at 1725 pump rpm:

Minimum ... 5.3 L/min (1.4 US gpm)

Fuel flow requirements with fuel inlet's temperature at 40 °C (104 °F):

Back pressure ... 414 kPa (60 psi)

(4) Nut for 6N-1069 Spring

Torque for nut ... 37 ± 4 N·m (27 ± 3 lb ft)

(5) Nut

Torque for nut ... 30 ± 7 N·m (22 ± 5 lb ft)

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