Damper Assembly. The damper assembly attaches to the rear of the gear pump. A steel diaphragm in the
assembly reduces pressure pulses in the fuel system to a minimum.
Remove the capscrews (1, Figure 6-7), lockwashers (2). and washers (3), and separate the body (4)
from the plate (9).
Remove the preformed packings (7), diaphragm (6), preformed packing (5), and nylon washer (8).
Discard the packings.
Inspect. Refer to Figure 6-7.
Compressed air used for cleaning or drying can create airborne particles that may enter the
eyes. Pressure shall not exceed 30 psi (207 kPa). Wearing of goggles Is required to avoid
Injury to personnel.
Clean all parts in dean diesel fuel, regular grade DF2 W-F-800, and blow dry it with compressed air.
Inspect all threaded parts for damage and stripped threads. Repair minor thread damage by
chasing. Repair stripped holes in accordance with paragraph 2-12. Replace stripped capscrews.
Visually inspect the body (4) and plate (9) for cracks, and defects in the packing grooves that would
prevent proper sealing. Replace a defective body or plate.
Replace the nylon washer (8) if it is cracked or damaged.
Replace the diaphragm (6) if it is visibly cracked or damaged.
Check the diaphragm (6) for hidden cracks by dropping it on a flat, hard surface. The diaphragm
shall have a dear, ringing sound when it strikes the hard surface. Replace the diaphragm if it has a
dull or flat sound.
Install the nylon washer (8, Figure 6-7) in the groove of the plate (9), followed by the preformed packing
(7), and diaphragm (6).
Install the preformed packing (5) in the groove in the body (4), position the body on the plate (9), and install
the capscrews (1), lockwashers (2), and washers (3). Cross-tighten the capscrews in three steps to 9 to 11
pound-feet (12 to 15 newton-meters).
Gear Pump. The gear pump pulls fuel from the generator set fuel tank, and supplies it to the fuel pump.
Remove the capscrews (1, Figure 6-8), lockwashers (2), and washers (3).
To avoid damage to the mating surfaces of the housing and cover do not Insert a screwdriver
or any other metal object between the mating surfaces to pry off the cover. The cover dowels
are a press fit In the cover; remove the cover by pushing against the dowels from the housing
Clamp the rectangular lug on the side of the housing (7) in the padded jaws of a vise, and remove
the cover (15) by pushing, or lightly tapping against the cover dowels (16) from the housing end.
Remove and discard the gasket (8).
Using needle nose pliers, remove the pressure valve (14), and discard it. Remove the cover dowels
(16) only if damaged.