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SERIES 4000 12/16V SERVICE MANUAL
Stationary Components
The shaft and bracket assembly (3) is bolted to the engine and supports the fan clutch components.
Pitot tubes (1) are secured to the shaft and pump oil from the clutch, directing it through the fan
clutch shaft and bracket assembly, back to the oil reservoir (engine oil pan). The rear main bearing
(6) is mounted on the fan shaft, as is a retainer/seal assembly which excludes debris and other
contaminants from coming in contact with the lip of the rear oil seal. See Figure 1048.
1. Pitot Tubes
5. Retainer Seal Assembly
2. Hook-Type Seal Rings
6. Rear Main Bearing
3. Shaft and Bracket Assembly
7. External Snap Ring
4. Rear Wear Sleeve
Figure 1048
Stationary Components
Operation Modes
The fan clutch is normally controlled by a thermal sensor and solenoid valve. Some engine or
machine manufacturers have incorporated the controls for the fan clutch into their own engine
or vehicle control systems. Basic fan clutch operational modes are described in the following
sections: refer to section DDEC IV Engine Control System, refer to section Fully Released Mode,
refer to section Modulated Variable Speed Mode, refer to section Fully Engaged Mode, and
refer to section Optional Fan Speed Limiting Systems.
All information subject to change without notice.
C -1606
Copyright © DETROIT DIESEL CORPORATION
Содержание 4000 Series
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Страница 2631: ...E TROUBLESHOOTING Section Page E 010 MECHANICAL TROUBLESHOOTING E 3 E 020 TESTING E 45 ...
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Страница 2681: ...F PREVENTIVE MAINTENANCE Section Page F 010 Rockford Fan Clutch F 3 ...
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