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A 737-300/400/500MAINTENANCE MANUAL
LOAD CONTROL
LOAD CONTROL CENTER-RIGHT (P6)
CENTER-LEFT (P18)
SEE AGENERATOR NO. 2 (RH) EXTERNAL POWER RECEPTACLE
ELECTRONIC COMPARTMENT ACCESS DOOR
GENERATOR NO. 1 (LH)
APU GENERATOR
AC LINE (3 PHASE)
DC LINE (28V)
28 VOLT AC TRANSFORMER SHIELD (J4)
STAB TRIM SHIELD AND 28 VOLT TRANSFORMERS (J5)
NOSE WHEEL WELL
FWD
T-R UNIT NO. 1
T-R UNIT NO. 2
T-R UNIT NO. 3
BATTERY
CHARGER
STATIC
INVERTER
BATTERY
ELECTRONIC
COMPARTMENT
ACCESS DOOR
A
Electrical Power System Component Location
Figure 1
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A 737-300/400/500MAINTENANCE MANUAL
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A
737-300/400/500MAINTENANCE MANUAL
ELECTRICAL POWER PRECAUTIONS - MAINTENANCE PRACTICES
____________________________________________________
TASK 24-09-11-912-001
1. Electrical Power Precautions____________________________
A. General
(1) The electrical power precautions are contained in Chapter 20, "Standard Wiring Practices", document D6-54446 (SWPM 20-00-10).
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A
737-300/400/500MAINTENANCE MANUAL
AC GENERATOR DRIVE SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________________
1. General (Fig. 1)_______
A. The two engine-driven generators are driven by constant speed drives to obtain a generator speed of 6000 rpm. The drive is a mechanical, differential, hydraulically controlled unit attached to the engine accessory gearbox. The drive supports the ac generator.
B. Manual control, monitoring lights and dial indicators for the drives are on the forward overhead panel in the control cabin. Lights indicate drive low oil pressure and high oil temperature. Dial indicator show drive oil-in temperature or drive oil-rise temperature, which is determined by DRIVE TEMP switch setting. Charge pressure, oil-in temperature, and oil-out temperature sensors are in the drive. A disconnect switch controls an electrical solenoid-operated mechanical disconnect in the drive unit.
C. The oil in the drive unit absorbs heat, lubricates, and transmits torque as the hydraulic medium. Oil is forced through a line filter and external cooler by a scavenge pump which picks up hot oil as it collects in the sump, coming from drains, from seepage and from lubrication points in the drive unit. Cool oil is returned to the all-attitude reservoir by the scavenge oil system. The swirl chamber in the reservoir removes and expels air carried by the oil. The normal temperature rise of the oil through the drive unit is about 10°C at continuous full load with an inlet oil temperature of 120°C, at normal input speeds.
D. A charge pump moves oil from the reservoir to the governor and controls cylinder and replenishes oil at the stationary port plate and at various lubricated surfaces. A charge relief valve restricts oil passage downstream from the port plate to ensure adequate supply of oil for the control, for the variable and fixed hydraulic displacement units, and for the lubrication nozzle. Oil in the input spline cavity lubricates the splines incidental to the input shaft and the connection to the engine.
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