Usage:
3406B Industrial Engines (7C6614 Arr.) In Driltech Rigs;
245 Excavators;
824C Tractors;
825C, 826C Compactors;
980C Loaders
- SUPPLEMENT: 06/01/87
SERVICE MAGAZINE; APRIL 20, 1987; PAGE 7; "Serviceable Parts For New Fuel Ratio Control; Pressurize Control To Set Rack On 3406B Engines In Driltech Drill Rigs". (Supplement Applies Only To 3406B Engines In These Oil Rigs). On Page 8, the next to the last paragraph contains an incorrect "FT" part number. The correct number for the fabricated test kit to pressurize the control is "FT1906".
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Reference: Service Magazine; November 10, 1986; Page 2, "New Fuel Ratio Control Used".
The reference article announces the use of a new 7W5318 Fuel Ratio Control Assembly on many of the above models. Parts Books and microfiche do not include the new parts in the fuel pump and governor groups that use the new fuel ratio control. These parts are shown in the following illustrations. Write a reference note by these groups in the affected Parts Books to refer to this article.
Individual parts of this control assembly are not serviced. The new fuel ratio control is effective with vehicular engine serial number 70V22984.
Illustration 1. New parts in the governor and fuel injection pump groups for all models.
Illustration 2. New linkage and parts in the governor groups (internal view of governor lever where connected to the new control). For 3406B Engines in Driltech Drill Rigs, see Illustration 3.
Illustration 3. New linkage and parts in the governor group for only 3406B Engines with the 7C6614 Engine Arrangement in Driltech Drill Rigs. Shown is an internal view of the governor lever connected to the new control.
A Service Manual Supplement will cover system operation, testing and adjusting, and disassembly and assembly of the control linkage.
If service work is done on the new control, there are two differences to remember that apply ONLY to the drill rig application.
... The control must be pressurized to 105 kPa (15 psi) in order to check the static fuel setting. This can be done with air pressure and a suitable pressure regulating valve. Or, the fabricated test kit (FT1829) can be used.
... Also, in the governor linkage, a special 7C8219 Lever Assembly is used. See Illustration 3. This lever assembly uses a 7C8220 Piston and has NO spring. These changes inside the governor cause the maximum fuel setting at startup and during low boost to be limited to the fuel ratio control setting. These changes also help engine starting in this application.