TM-5-3805-254-14-P-2
TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)
TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)
JUNE 1980
TM-5-3805-254-14-P-2 - Page 474 of 894
TRUCK SERVICE MANUAL
FUEL SYSTEM
6. Insert PT (type D) Injector in Service Tool
3375086 or ST-1058 Adapter.
Fig. 6-1-36,
Note: ST-10585 and ST-1058-6 spacers
are not required with ST-668, for PT
(type D) injectors.
Note: Use plunger bore plug assembly
ST-668-5012 for PT (type D) injectors.
7. Remove plunger assembly and spring from
injector.
8. Select correct size plunger bore plug and rubber
seal and; install in injector plunger bore.
Protect
injector plunger from dirt or damage during tests.
9. Install the solid knurled plug in injector drain
opening, Service Tool 3375086.
10. Place injector in ST668 seat and adjust
holddown bracket into position required, then
tighten thumb screw.
11. Tighten knob against plug and seal in plunger
bore so it seals thoroughly.
Table 6-1-14: ST-668 Cup Seat Spacer
Cup Spray
Spacer
Spacer
Angle
Marking
Height
Inch [mm]
10 deg.
H-10
0.563/0.569
[14.30/14.45]
12. attach fuel inlet line from ST790 or other
pressure source to injector inlet
On PT (type D)
injectors use ST1 058 adapter.
13. Start ST790 Test Stand or other source of fuel
and set pressure to 22 psi [152 kPa].
14. Shift target ring in base of tool so one spray
stream hits center of No.
1 or index window.
This is tallest window and is next to target slide
handle.
This window provides +3 degrees
tolerance on injector spray stream location.
On 1974 and later injector cups, +2 degrees
tolerance must be maintained on all streams.
15. Each spray stream must hit a window in the
target ring on 1974 and later cups.
Note
:
For a cup to be acceptable no more than
one stream must require the increased tolerance
of the No.
1 window.
17. After testing, assemble plunger with spring in
body adapter ’and store in clean place until ready
for flow test.
ST-790 Test Stand Installation and Calibration
Injector Test Stand ST790
The ST790 Injector Test Stand is the recommended
calibration equipment for testing and calibrating
Cummins injectors, but it must be properly installed and
calibrated to obtain the highest accuracy possible.
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