GEAR-HYDRAULIC PUMP DRIVE 2364406 - Caterpillar

Location of fuel transfer pump components. 7S-4440 Bolt (1). 4B-4863 Washer (2). 6N-1069 Spring (3).If low fuel transfer pump outlet pressure is suspected, install a gauge to measure that fuel pressure. To increase the pressure, 4B-4863 Washers (2) can be installed between bolt (1) and spring (3). See the illustration. Measure the fuel pressure at the outlet of the fuel transfer pump at full rated load each time a washer is installed. Install washers (2) as required to obtain a pressure of 230 35 kPa (33 5 psi).
A 4N-7465 Gasket is required between bolt (1) and the fuel transfer pump housing. Tighten bolt (1) to a torque of 37 4 N m (27 3 lb ft).
Current production machine engines have two washer added to the fuel transfer pumps. The addition of 4B-4863 Washers is effective with 3408 (48W38680) Machine Engine and 3412 (73W16371) Machine Engine. The parts manuals do not currently show this modification.