TM 5-3820-233-35/1
(8) Install new pump cover gasket. Slide
e. Reassembly
the pump cover over studs and secure to
(1) Reassemble the governor and gov-
pump body with four lockwashers and nuts.
ernor assembly in the reverse of the numeri-
(9) Install drain cock.
cal sequence as illustrated on figure 12.
f. Installation. Refer to Operator's Man-
(2) When reassembling bearing (15)
ual.
and drive shaft (16), support bearing on the
bed of an arbor press, and press drive shaft
34. Hydraulic Governor and Governor
into bearing until shoulder of shaft is against
Drive
the bearing.
(3) To reassemble bearing (77), sleeve
a. General
(76), and driven shaft (78), start bearing on
(1) The hydraulic governor regulates
shaft followed by the sleeve. Properly sup-
the engine speed under varying load condi-
port sleeve on the bed of an arbor press, and
tions, and serves as an automatic shutdown
press shaft into bearing and sleeve.
device when there is a malfunction in the
lubricating oil pressure system. Should the
f. Installation and Adjustment. Refer to
engine fail to supply oil to the governor, the
the Operator's Manual.
servo motor piston will drop, allowing the
fuel rod to return to the NO FUEL position.
35. Fuel Pump
(2) The governor is driven by the upper
a. General. The fuel pump is mounted to
blower rotor through a horizontal drive shaft
the rear of the blower assembly and is driven
and bevel gear, and a vertical driven shaft
by the lower blower rotor. The fuel pump
and bevel gear. Both are mounted on ball
draws fuel from the supply tank and de-
bearings and located in the governor drive
livers it at correct pressure to the fuel in-
housing.
jectors.
b. Removal. Refer to Operator's Manual.
b. Removal
c. Disassembly. Disassemble the governor
c. Disassembly. Disassemble the fuel pump
and governor drive assembly in the numerical
in the numerical sequence as illustrated on
sequence as illustrated on figure 12.
figure 13.
d. Cleaning, Inspection, and Repair
(1) Wash all parts with an approved
Note. Use extreme care when removing drive
shaft as score marks on the square end of shaft will
cleaning solvent and dry thoroughly.
damage the oil seal contact surface.
(2) Inspect pilot valve plunger for
scratches or burrs. Defective areas may be
d. Cleaning, Inspection, and Repair
corrected with a fine India stone.
(1) Clean all of the parts with an ap-
proved cleaning s o l v e n t a n d d r y t h e m
Note. Do not round off edges of plunger when
thoroughly.
dressing it with the India stone.
(2) Inspect oil seals for nicks and
(3) Inspect servo motor piston for
cracks. If oil seals are removed, they must be
scratches or burrs. Correct defective areas
discarded and replaced with new seals.
with a fine India stone.
(3) Inspect pump shafts and gears for
Note. Do not round off edges of piston when
wear or scoring. The driven shaft is serviced
dressing it with the India stone.
as a gear and shaft assembly only. Replace
defective parts.
(4) Inspect oil pump gears and gear
teeth of drive and driven shafts for scoring,
(4) Inspect pump body and cover for
chipping or wear. Replace defective parts.
scoring or other damage. Replace defective or
(5) Inspect drive and driven shafts for
damaged pump body or cover.
scoring and wear. Replace a defective shaft.
(5) Inspect relief valve for scoring and
(6) Inspect all bushings and bearings
burrs. If valve is scored and cannot be cleaned
for distortion, wear, pitts, scoring, or wear.
up with fine emery cloth or crocus cloth, re-
Replace defective bushings and bearings.
place the valve.
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