TM 5-3810-300-24&P-3
Starting Aids 12.6
4. Remove the inlet and outlet check valves.
Starting Aid Pump
Inspection
The principal parts of the starting aid pump are the body,
plunger and the spring-loaded ball type inlet and outlet
check valves (Fig. 2). The pump body is threaded
Clean the parts with fuel oil and dry them with
externally at one end for mounting purposes. One end of
compressed air. Examine the seal rings for wear or
the plunger is threaded into the operating knob. Two
cracks. Replace the seal rings if necessary. The check
seal rings of oil resistant material are located in grooves
valves cannot be disassembled. However, they may be
at the other end of the plunger. The inlet check valve,
cleaned by forcing fuel oil through them with any suitable
which opens on the suction stroke of the plunger and
pump.
Inoperative valves must be replaced.
If
seats under pressure, is located in the side opening of
excessive resistance was encountered during operation
the pump body. The outlet check valve, which seats
of the pump, the nozzle in the air inlet housing may be
under suction and opens under pressure, is installed in
plugged. Remove and clean the nozzle.
the end opening of the pump body. The check valves
are identified by the number "1/2" stamped on the inlet.
Assemble Pump
valve and the number "30" on the outlet valve. An arrow
indicating the direction of flow is also stamped on each
1. Install new seal rings on the plunger.
check valve.
2. Install the lock spring in the plunger nut. Then place
Remove Pump
the steel ball on top of the spring.
Remove the starting aid pump from the mounting panel
3. Depress the lock ball and slide the plunger nut-- hex
as follows:
end first--over the threaded end of the plunger.
1. Disconnect the starting fluid inlet and outlet tubes
4. Thread the knob on the plunger.
from the pump.
5. Install the outlet check valve (marked "30") in the
2. Unscrew the plunger nut from the pump body and
end opening of the pump body. The arrow must point
withdraw the plunger assembly.
away from the pump body.
3. Loosen the pump body jam nut behind the mounting
6. Install the inlet check valve (marked "1/2") in the side
panel.
opening of the pump body. The arrow must point toward
the pump body.
4. Remove the pump body from the rear of the panel.
Install Pump
5. Remove the jam nut from the pump body.
1. Thread the jam nut on the pump body.
Disassemble Pump
2. Insert the thread end of the pump body through the
When the pump was removed from its mounting panel,
mounting panel (from the rear of the panel).
the plunger assembly was removed from the pump body.
If further disassembly is required, proceed as follows:
3. Lubricate the seal rings and carefully slide the
plunger assembly into the pump body. Thread the
1. Unscrew the knob from the plunger assembly.
plunger nut on the end of the pump body and tighten it.
2. Slide the plunger nut from the plunger.
4. Install the starting fluid inlet and outlet tubes.
3. The plunger lock ball and spring may be removed by
5. If removed, install the nozzle in the air inlet housing.
tapping the plunger nut to dislodge them. It is not
necessary to remove the plug.
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