MAINTENANCE OF FUEL TRANSFER PUMP ASSEMBLY
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.
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.
When removing fuel transfer lines, guard
against siphoning from the external fuel
Remove four screws (13), washers (14),
and nuts (15).
Installation. (See figure 9-1)
Install pump (16) onto bracket (51) with
four screws (13), washers (14) and nuts
Attach fittings (8 and 10) and hose
assemblies to inlet and outlet ports of
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).
Inlet Filter. Remove inlet filter assembly (7)
and seal (8) from end plate (31).
Bypass Assembly. Unscrew plug (9) from end
plate (31). Remove spring (10), piston (11),
seal (12), sleeve (13), and bypass spring (14).
Remove wire (29) from screws (30).
Remove screws and end plate (31).
Remove pump blade (34) with shaft (35),
drive blade (36), seal (37), plate (38),
seal (39), and liner (33) with pin (32).
Motor Bearings. After pump blade assembly
has been removed, remove motor bearings as
Remove wire (15) from screws (16).
Remove screws (16) and washers (17),
and remove front head (18).
Separate front head (18) from body (43)
and housing (40).
Remove bearings (28) and (42) from
armature (41) shaft.
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.
Feed thru Capacitor. Remove wire (3) from
four screws (4). Remove connector shell (5)
and feed thru capacitor (6) by removing four