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D.  For the hydraulic unit to function properly and also to be properly lubricated, the charge pump must maintain about 200 psi at the stationary port plate. (See figure 2.) The pressure sensor located downstream from the port plate, signals the caution light on the overhead panel when oil pressure is below a minimum safe value of 100 to 150 psi. When the low pressure light comes on the master caution light also comes on. Both lights should be off during normal operation. (See figure 6.) Refer to Master Warning and Caution Lights - Description and Operation, Chapter 33.
E.  Rotation of the drive unit can be stopped by the disconnect in the input shaft. (See figure 5.) The solenoid is energized by pushing the disconnect switch on the overhead panel (P5-5) to ON. The nose pin is retracted releasing a spring-loaded pawl, and the resulting action wil1 disengage the rotating input shaft from the differential gear. Re-engagement should be attempted only with the engine shut down and after it comes to a complete stop. Re-engagement is accomplished by pulling downward on the disconnect reset handle until a stop is felt, and then releasing the T-handle.
F.  The CSD is geared directly to the engine and operates whenever the engine is running. Operation of the CSD is monitored by observing the CSD low oil pressure light, the CSD oil temperature indicator, and the output voltage and frequency of the generator it drives.
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AC GENERATOR DRIVE SYSTEM - TROUBLE SHOOTING
1.  General
A.  Trouble shooting charts on the following pages are set up to aid in locating causes of specific symptoms that may appear in starting and operating the ac generator constant speed drive system. The charts are arranged so that by starting at the top and proceeding downward the trouble may be isolated and corrected. Such trouble charts can not be given for every possible trouble that may occur, but may be used as a guide in isolating troubles not listed.
CAUTION:  BEFORE RECONNECTING A DISCONNECTED CSD TO PERFORM TROUBLE SHOOTING, CHECK CSD OIL FILTER PRESSURE DIFFERENTIAL INDICATORS, CSD OIL LEVEL AND CONDITION, AND CSD MAGNETIC PLUG PER 24-11-11, I/C. RECONNECTING A CSD WITH FAULTS IN THESE AREAS MAY RESULT IN SEVERE DAMAGE TO THE CSD.
2.  Trouble Charts
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H29114 H29107 H29098 H29090 H29088 H29085
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AC GENERATOR DRIVE SYSTEM - MAINTENANCE PRACTICES
1. General
A.  This section provides a procedure for pressurizing the CSD hydraulic system to check for oil leaks with the engines shut down. 
2.  Equipment and Materials
A.  CSD leak tester (Fig. 201), consisting of the following:
(1)  
Hose adapter OMP 2506-3, Ozone Metal Products, 101-32 101st St., Ozone Park, Long Island, N.Y.

(2)  
Flexible hose (approximately 6 feet in length), capable of withstanding 100 psi

(3)  
Relief valve, pre-set at 50 psi

(4)  
Regulator with 0 to 100 psi pressure gauge

(5)  
Relief valve, pre-set at 100 psi

(6)  
Shut-off valve

(7)  
Fittings, as required

B.  Dry compressed air source, or a regulated nitrogen source (100 psi maximum).
3.  Check CSD Hydraulic System For Leaks
A.  Position the shut-off valve to OFF and shut off the regulator valve to prevent pressurization of CSD.
B.  Connect hose adapter to CSD pressure fill fitting.
C.  Connect the other end of tester to the compressed air or regulated nitrogen source.
D.  Turn the shut-off valve to ON and adjust the regulator to 25 PSIG.
CAUTION: DO NOT EXCEED 50 PSIG TO THE CSD. DAMAGE TO CSD MAY RESULT.
　
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