TM 9-6115-604-34
NAVFAC P-8-633-34
CHAPTER 6
FUEL SYSTEM
SECTION I. FUEL TRANSFER PUMP
6-1. GENERAL. The purpose of the fuel transfer pump is to fill the generator set fuel tank from an outside fuel
reservoir. The fuel transfer pump is a gear pump and is driven by an ac electric motor.
6-2. FUEL TRANSFER PUMP REPAIR . Repair of the fuel transfer pump is accomplished by replacement of worn or
damaged components.
a.
Remove. Remove the fuel transfer pump in accordance with paragraph 4-47 of the Operator and Organizational
Maintenance Manual.
b.
Disassemble.
(1)
Remove cap (1, Figure 6-1) and gasket (2) from pump.
NOTE
When removing pressure relief valve adjusting screw, be sure to note the number of turns it
takes to remove it. This screw must be reinstalled the same number of turns.
(2)
Remove pressure relief valve adjusting screw (3), valve spring (4), and valve stem (5).
(3)
Remove drain screw (6) and gasket (7).
(4)
Remove the six screws (8) that retain pump end cap (9) and remove pump end cap, bushings (10), and
housing (11) from stand (12).
(5)
Remove screws (13) and remove gland (14).
(6)
Remove carbon seal (15), performed packing (16), retainer (17), tapered spring (18), and split ring (19)
from stand (12). Discard seal and preformed packing.
(7)
Remove drive and driven gears (20) and bushings (10) from stand.
c.
Assemble.
(1)
Lubricate drive and driven gear shafts (20) with dean lubricating oil, such as MIL-L-9000. Install drive and
driven gears (20) and bushings (10) in stand (12).
(2)
Install split ring (19), tapered spring (18), retainer (17), preformed packing (16), and carbon seal (15) in
stand (12).
(3)
Install gland (14) and secure it with screws (13).
(4)
Position bushings (10) in pump end cap (9), slide pump end cap and housing (11) over gears and secure
with six screws (8).
(5)
Install drain screw (6) and gasket (7).
(6)
Install valve stem (5), valve spring (4), and adjusting screw (3). Be sure adjusting screw is turned the
same number of turns as before it was removed.
(7)
Install cap (1) and gasket (2).
d.
Test. After repair, test fuel transfer pump in accordance with the Operator and Organizational Maintenance
Manual.
e.
Install. Install the fuel transfer pump in accordance with paragraph 447 of the Operator and Organizational
Maintenance Manual.
6-1
