Specifications

Instructions 77-9045 Bacharach, Inc. Page 2-9
CD3 AUDIT KIT CUMMINS INJECTORS
11. If, after rerun, pressure is not between 400 and
410 psi, adjust the relief valve:
a. Stop the main drive motor.
b. Open the valve on the test gauge set.
c. Follow the clear plastic tubing from the
fitting at the high pressure pump to the
calibration fluid tank under the calibrator.
d. Lift the pressure relief valve (on the end of
the plastic tubing) out of the reservoir.
e. Adjust the set screw from the open end of
the relief valve with a 5/32 in. Allen
wrench. First, loosen or remove the locking
screw. Then, turn the screw clockwise to
increase the pressure, counterclockwise to
decrease the pressure. Retighten the
locking screw.
NOTE: One quarter turn will result in
approximately a 25 psi change.
f. Insert the tubing with the relief valve into
the reservoir.
g. Restart the main drive motor.
h. Check the pressure reading on the test
gauge set.
i. Repeat steps d through h as often as
necessary to bring the pressure into the
required 400 to 410 psi range.
12. If pressure is below 400 psi and cannot be ad-
justed with the relief valve, the problem may be
either with the valve or the gear pump. Replace
defective part and rerun steps 11g and 11h.
13. Repeat step 9.
2.5 DISCHARGE HEAD CHECK
Performance of the discharge head (67-7642) has a
pronounced effect on Cummins injector output
readings. The check valve in the head was designed
to close immediately after each injection to prevent
fuel backflow and permit buildup of correct up-
stream pressure. Any deviation from the prescribed
specification will alter the injector fuel output.
Figure 2-13. Open Valve
Figure 2-14. Adjusting Relief Valve
ÐOPEN VALVE
ÓADJUST RELIEF
æVALVE