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 TM 55-4920-405-13&P
(f) Reassemble the high pressure filter.
(2) Alternator. To repair the alternator,
Install a new element and gasket.
proceed as follows:
(3) Low Pressure Filter. To repair the low
(a) Replace the voltage regulator or
pressure filter, proceed as follows:
rectifier if these items do not check
out correctly according to the trouble-
(a) Disassemble the low pressure filter.
shooting procedures.
(b) Throw away the filter element and
(b) Replace the voltage regulator and
gasket.
rectifier if their cases are cracked or
(c) Thoroughly clean all parts.
broken.
(d) Replace the case if it is dented or
(c) Replace broken wires and broken
ruptured.
connectors.
(e) Replace the fittings if their threads
(d) Replace the alternator stator if the
are damaged.
troubleshooting test shows it to be
(f) Reassemble the low pressure filter.
defective.
Install a new filter element and
gasket.
(3) Starter Motor.
To repair the starter
motor, proceed as follows:
To repair valves, proceed as
(4) Valves.
follows:
(a) Disassemble the starter motor. (See
(a) Disassemble the valve.
(b) Check brushes (2). Replace the
(b) Check all threaded parts for damaged
brushes if they are worn too far, or if
threads. Replace any of these parts
they are damaged.
that show thread damage.
(c) Clean armature (1) and inspect the
(c) Replace any damaged "O" rings and
commutator segments. If the com-
seals.
mutator is gouged or scored heavily,
(d) Replace any damaged valve seats.
replace the armature.
(e) Replace all other parts that show sig-
(d) Check bearing (7) and bearing plate
nal of scoring or excessive wear.
assembly (5) for wear. Replace these
( f ) Reassemble the valve.
parts if they are worn excessively.
(e) Using an ohmmeter, check field coil
c. Engine.
package (3) for continuity. Replace
the field coil package if you get an
(1) Fuel Pump. To repair the fuel pump, pro-
open indication.
ceed as follows:
(f) Replace all other worn or damaged
parts.
(a)
File a groove across a point where
(g) Reassemble the starter motor.
mounting bracket (15, figure 4-11) and
fuel head (16) join so that you can put
b . Hydraulic System.
these parts back together in the same
way.
(1) Hydraulic Pump. To repair the hydraulic
Remove screws (3), and remove fuel
pump, proceed as follows:
(b)
head (16) with attached parts from
mounting bracket (15).
(a) Disassemble the hydraulic pump.
(c)
Remove screw (2) and washer (8), and
(b) Examine all gaskets and seals. Re-
remove cover (7) and gasket (4).
place any of these parts that you find
Throw the gasket away.
are defective.
(d)
Turn fuel head (16) over. Remove
(c) Replace all parts that show excessive
both valve assemblies (5) and gaskets
w e a r , corrosion, or scoring.
(6). Note the positions of the valve
(d) Replace defective bearings, and end
assemblies.
plates that have scored machined
(e)
Clean fuel head (16) thoroughly with
surfaces.
kerosene or diesel fuel and a fine
(e) Thoroughly clean all metal parts of
brush.
the hydraulic pump.
(f)
Position fuel head (16) with the dia-
(f) Reassemble the hydraulic pump.
phragm surface up. Assemble new
gaskets (6), and insert valve assem-
(2) High Pressure Filter. TO repair the high
blies (5) in the position shown in fig-
pressure filter, proceed as follows:
without distorting them, and stake the
(a)
Disassemble the high pressure filter.
valves in place.
(b)
Throw away the element and gasket.
Install new cover gasket (4), cover
(c)
Thoroughly clean all other parts.
(g)
(7), and washer (8), and install screw
(d)
Replace the case if it is dented or
(2) .
punctured.
(h)
Set the assembled fuel head section
(e) Replace the top case if the threads for
aside.
the fittings are damaged.
4-23
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