TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 CHAPTER 9 MAINTENANCE OF FUEL TRANSFER PUMP ASSEMBLY 9-1. GENERAL.  The fuel transfer pump (figure 9-1) is used to transfer diesel fuel from an external source to the generator set fuel tank.  It is mounted on the left side of the generator set, in back of the AC-DC control box assembly. The fuel transfer pump assembly fuel inlet connection is located on the base assembly, below the fuel transfer pump assembly.  The fuel transfer pump is electric motor driven and actuated by a control panel selector switch.  In the automatic AUTO position, transfer pump operation is controlled by a float level switch in the generator set fuel tank and the fuel flow is controlled by a solenoid valve on the fuel transfer pump assembly. 9-2. REPLACEMENT. a. Removal. (1) With system off, disconnect hose assemblies connected to the inlet and outlet ports of the pump.  Remove fittings from pump (8 and 10). Disconnect the electrical connector on the pump motor. NOTE When removing fuel transfer lines, guard against siphoning from the external fuel source. (2) Remove four screws (13), washers (14), and nuts (15). b. Installation.  (See figure 9-1) (1) Install pump (16) onto bracket (51) with four screws (13), washers (14) and nuts (15). (2) Attach fittings (8 and 10) and hose assemblies to inlet and outlet ports of pump. 9-3. REPAIR.  (See figure 9-2.) Pump repairs involve replacement of the inlet filter assembly (7), bypass assembly (9 through 14), pump blade (34), motor hearing (28 and 42), and motor brushes (25). a. Inlet Filter.  Remove inlet filter assembly (7) and seal (8) from end plate (31). b. Bypass Assembly.  Unscrew plug (9) from end plate (31).  Remove spring (10), piston (11), seal (12), sleeve (13), and bypass spring (14). c. Pump Blade. (1) Remove wire (29) from screws (30). Remove screws and end plate (31). (2) Remove pump blade (34) with shaft (35), drive blade (36), seal (37), plate (38), seal (39), and liner (33) with pin (32). d. Motor Bearings.  After pump blade assembly has been removed, remove motor bearings as follows: (1) Remove wire (15) from screws (16). Remove screws (16) and washers (17), and remove front head (18). (2) Separate front head (18) from body (43) and housing (40). (3) Remove bearings (28) and (42) from armature (41) shaft. e. Motor Brushes.  Motor brushes are readily removable by unscrewing caps (24) and removing brushes (25).  Replace brush after 2500 hours of operation or if square section of brush is less than ¼  inch in length. f. Feed thru Capacitor.  Remove wire (3) from four screws (4).  Remove connector shell (5) and feed thru capacitor (6) by removing four screws (4). 9-1