TM 5-3810-289-34
(c) Clean magnet before reassembly; it is
available and each is identified by color stripes. See
soldered to top retainer and is designed to catch
particles of iron which are worn or chipped from pump
Note. Shims are available in P0.005, 10.010 and
parts or enter with the fuel supply.
#0.020 inch thickness. The final number of shims must
Note.
Governors have double screen
be determined during fuel pump calibration.
arrangements.
The upper screen can not be
Install the spring: pack cover and gasket.
disassembled.
Install capscrews and washers securing cover to
(11) Tachometer drive
housing.
(a) Remove tachometer drive cover screws.
(5) Gear pump.
(b) Lift drive cover and gasket from main
(a) Assemble the gear pump to the main
housing. Discard gaskets.
housing using a new gasket, figure 3-25. Locate notch
(c)
Carefully drive tachometer drive
to upper right hand corner (looking from behind the fuel
assembly from main housing, using a brass punch and
pump).
hammer, figure 3-18.
Note. Use correct gasket and be sure it is
(d) Remove seal from shaft and discard.
positioned correctly.
d. Assembly.
(b) Install capscrews, lock, washers and
(1) Vise and holding figure. Mount the fuel
plain washers: torque in increments to 7/9 ft-lbs, figure 3-
pump housing on Pump Mounting Plate ST-546 and Ball
Joint Vise ST-302.
(c) Install fuel inlet connection using a pipe
(2) Tachometer drive.
sealer. Use sealer sparingly to keep out of pump. Cover
(a) Install tachometer drive assembly into
connection to keep out dirt.
fuel pump main housing. Press assembly into housing
(d) Install cooling check valve and/or elbow
using ST430 Mandrel.
into top of gear pump.
(b) Press oil seal on the tachometer drive
(6) Throttle shaft (fig. 3-27). Throttle shafts
with sealing lip down. Seal must seat on the drive
vary with applications. Replace with identical throttle
bushing.
shaft, if replaced, table 2-2.
(c) Assemble tachometer cover and new
(a) Install new O-ring on throttle shaft using
gasket to the fuel pump housing, figure 3-19.
ST-835 Packing Tool Assembly for 1/2 inch (ST-422 for
(d) Install screws and washers in cover.
larger) shaft to avoid damage to O-ring; oil before
(3) Filter screen
assembly, figure 3-28.
(a) Assemble the filter screen assembly into
(b) Insert the throttle shaft in sleeve so the
the housing, the hole in the bottom retainer goes down,
"ears" of the stop are curved downward or if pin is used
so open side of pin is down, lubricate with fuel oil.
(b) Install performed packing using grease
to hold in place.
(c) Position spring and tighten cover in
place. Torque cap to 25/30 ft.-lbs. Overtightening is not
necessary or desirable.
Note.
MVS governors and special electric
governors contain two screen assemblies.
(4) Governor spring pack.
(a) Assemble screw into plunger guide,
place small copper washer over screw point inside
plunger guide, figure 3-21. Place small idle spring into
plunger guide and place idle plunger (button) against
spring in plunger guide (fig. 3-22). See table 2-2(5)o for
correct plunger to use. The plunger controls maximum
fuel pressure produced by the fuel pump. All plungers
with code number 170 or higher require adapter part
number 144676.
(b) Place the maximum-speed spring over
the rear of plunger guide and place shim against spring,
Figure 3-21. Washer being installed over plunger.
install retainer and snap ring securing assembly into
governor sleeve (fig. 3-24).
Note. There are different maximum-peed spring
3-10
