relief valve is scored and cannot be cleaned up with fine emery lot or crocus cloth, replace the valve.
a Refer to figure 3-10. Lubricate the lips of oil seals (17) and install the seals in pump body (18). Install the seals
so that the seal lips point away from the gears, and so that the space between the seals corresponds to the drain holes in
the bottom of the pump body.
b Clamp the pump body in a bench vise (equipped with soft jaws) with the cavity end up. Lubricate the outside
diameter of the relief valve (15) and place it in the cavity with the hollow end up. Insert spring (13) into the valve, and
insert pin (14) into the spring. Install a new gasket (12) and install valve plug (11) into the pump body.
c. Install drive gear (9) on shaft (10) over the end of the shaft that is not squared. The slot in the gear must face
the plain end of the shaft. Press the gear beyond the retaining ball detent. Place ball (7) into the detent and press the
gear back until the end of the slot contacts the ball.
d. Lubricate the pump shaft and insert the square end of the shaft into the opening at the gear side of the pump
body and through the oil seals previously installed.
e. Install gear and shaft (10) in the pump body.
The gear (10) must be centered on the shaft to give proper end clearance. Also, the chamfered end of the gear
teeth must face the pump body.
f Lubricate the gears and shaft with clean engine oil.
g. Apply a thin coating of Loctite sealnt, or equivalent, on the face of the pump cover outside the gear pocket
area. Install alignment pins (16) and place the pump cover (6) against the pump body. (With the two alignment pins
installed, the cover can only fit the pump body in one position.)
The coating of sealant must be extremely
thin, because pump clearances are set on the basis of metal-to-metal contact. Use care that the sealant is not
squeezed into the gear compartment or damage may result to the gears and shafts.
h. Install bushing (5) and secure the cover into position with screws (4). Tighten the screws alternately and
i Rotate the pump shaft manually to assure that the parts rotate freely. If the shaft does not rotate freely, gently
tap a corner of the pump.
a. Install coupling (3) on the drive shaft end. Install a new gasket (2) on the engine. Install the pump assembly on
the engine and secure with screws (1).
b. Refer to TM 5-3810-295-12 and connect the fuel lines to the pump.
Section X. REPAIR OF ENGINE GOVERNOR
The variable speed mechanical governor holds the engine at any constant speed, between idle and maximum, as desired
by the operator. The governor is mounted on the rear end plate of the engine and is driven by a gear that extends through
the end plate and meshes with the balance shaft gear.
a Refer to TM 5-3810-295-12 and paragraph 3-50 and remove the fuel pump and associated fuel lines.
b. Refer to figure 3-11. Remove spring (1), bracket
2), screw (3), lock washer (4) and throttle lever (5).
c. Loosen hose clamps (6) and slide hose (7) to one side. Remove cotter pin (8), spring retainer (9), flat washer
(10) and link (11).
d. Remove lubrication tube elbow (12), tube adapter (13), boot adapter (14) and pipe tee (15).
e. Remove mounting screws (16), (17) and (18) and lock washers (19), (20) and (21). Lift the assembly from the
engine and remove gasket (22.
a Refer to figure 3-12. Remove screws (1) and (2), washers (3), cover (4) and gasket (5).
b. Remove pin retainer (6), washer (7), differential lever (8) and pin (9).