Delivery Valve Test

TM 9-2910-226-34

manually work the valve in the bore. Valve must be

NOTE

free with no sticking or binding. If valve does not

Do not exceed 425 psig as damage to

preformed packings may result.

operate freely, replace the hydraulic head assembly.

c. If the reading is not within specification,

g. Install valve (C), delivery valve spring (B), and

screw (A), and torque tighten valve screw to 40-45

remove the delivery valve and inspect the spring,

foot-pounds. Loosen screw and retorque to 40-45

valve, and seat for foreign matter or damaged parts

foot-pounds two more times.

(fig. 3-166). If spring is defective, replace spring. If

valve or seat is defective, replace the hydraulic head

3-54. Delivery Valve Test. a. Rotate the drive

assembly.

coupling in a counterclockwise direction until the

slotted, red painted tooth is one-half tooth to the

3-55. Hydraulic Head Leak Test. a. Remove timing

right of the mark on the pump housing.

device cover, timing window cover or fuel shutoff

b. Slowly actuate the nozzle tester and note the

housing. Rotate the drive coupling in a clockwise

reading on the nozzle tester gages as the delivery

direction until the mark on the advance unit hub is

valve opens. This will be evidenced by a sudden drop

alined with the pointer (port closing) (fig. 3-168).

in pressure. The delivery valve should open between

250 and 400 psig.

Table 3-4. Calibration of LDT-465-1C (Code E Pump)

3-98