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TM 5-4320-305-24
4-4. REPAIR INJECTION PUMP (Continued)
5 Inspect six pistons (56) and six plungers (74) for
scratches, nicks, and grooves. Dip each mating
plunger and barrel in clean calibrating fluid. Place
piston in plunger. Hold parts vertically and position
about 3/4 of plunger length in piston. Release plunger
into barrel. Plunger must slide smoothly into barrel
until it reaches the stop. If part fails inspection replace
mating barrel and plunger as an assembly.
6 Inspect six delivery valves (73) and six fillers (70) for
cracks or grooving. Inspect delivery valve for crushed
or unevenly worn seats. Insert each filler into mating
delivery valve and inspect for freedom of movement.
If either part is damaged, replace both filler and its
mating delivery valve.
7 Inspect six piston springs (58) for damage to protective
coating, cracks, or permanent set. Replace damaged
spring.
8 Inspect rod (64) for chipping, cracks, or worn gear
teeth. Remove slight grooving using crocus cloth. If
otherwise damaged, replace rod.
9 Inspect flyweight (26) for damaged or worn rollers,
pivot pins, and weights. If damaged, replace flyweight
as an assembly.
10 Inspect all other parts for cracks, distortion, uneven wear, or heavy grooving. Inspect all threaded parts for damage
to threads. Replace damaged part.
ASSEMBLY:
1
Install two rings (79) into housing.
2
Install threaded ring (78).
3
Install guide bushing (77) using ring wrench KDEP 2961.
4
If new rings (79) were installed, ream rings using bushing reamer KDEP 2999. Remove all chips created by
reaming operation.
5 Place together the following parts tagged as belonging to bore number one during disassembly: pipe connection (68),
filler (70), spring (71), delivery valve (73), and plunger (74). Install parts as follows:
a. Lower plunger (74) into housing bore number one. Aline groove in plunger with pin in housing.
b. Install delivery valve (73) into bore and onto plunger.
c. Install a new sealing washer (72).
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