S 482-014
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A

737-300/400/500
MAINTENANCE MANUAL

CSD PRESSURE
FILL FITTING

CONNECT TO CSD PRESSURE FILL FITTING
SHUTOFF
VALVE

REGULATOR
COMPRESSED
HOSE (6) AIR SOURCE 1
RELIEF VALVE
(PRESET AT 50 PSI) RELIEF VALVE (PRESET AT 100 PSI)
FOR A REGULATED
NITROGEN SOURCE
(ALTERNATIVE)

1
CSD LEAK TESTER
1 TO USE A REGULATED NITROGEN SOURCE, YOU MUST PUT A PLUG ON THE OPENING FOR THE COMPRESSED AIR SOURCE
Leak Tester Installation
Figure 201 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. CONSTANT SPEED DRIVES ú

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 ú ú 03 Page 202 ú Jul 15/91
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A

737-300/400/500
MAINTENANCE MANUAL

CASE PRESSURE-FILL VALVE
CONNECT TO THE CASE PRESSURE-FILL VALVE
SHUTOFF
VALVE

REGULATOR
COMPRESSED
HOSE (6) AIR SOURCE 1
RELIEF VALVE
(PRESET AT 50 PSI) RELIEF VALVE (PRESET AT 100 PSI)
FOR A REGULATED
NITROGEN SOURCE
(ALTERNATIVE)

1
VSCF LEAK TESTER

Leak Tester Installation
Figure 201 (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH -14 VSCF ú

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A

737-300/400/500
MAINTENANCE MANUAL

CASE PRESSURE-FILL VALVE
CONNECT TO THE VALVE CASE PRESSURE-FILL 
SHUTOFF VALVE  REGULATOR 
AIR SOURCE COMPRESSED 1  HOSE (6) 
(PRESET AT 100 PSI) RELIEF VALVE  (PRESET AT 50 PSI) RELIEF VALVE 
(ALTERNATIVE) FOR A REGULATED NITROGEN SOURCE 1  VSCF LEAK TESTER 
Figure 201 (Sheet 3) Leak Tester Installation 

A98329
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A
737-300/400/500MAINTENANCE MANUAL
 (a)  
If it is necessary, assemble the leak tester.

 (b)  
Set the shutoff valve to OFF.

 (c)  
Set the regulator valve to OFF, to prevent pressurization of the generator drive system.

 (d)  
Connect the hose adapter to the pressure fill fitting on the CSD or the case pressure-fill fitting on the VSCF.

 S 792-016
 (2)  Do the leak test.
 (a)  Connect the other end of the tester to a compressed air or regulated nitrogen source.
 CAUTION: DO NOT PUT MORE THAN 50 PSIG INTO THE GENERATOR DRIVE
_______ SYSTEM. TOO MUCH PRESSURE CAN CAUSE DAMAGE TO THE GENERATOR DRIVE SYSTEM.
 (b)  
Turn the shutoff valve to ON and adjust the regulator to 25 PSIG.

 (c)  
Set the shutoff valve to OFF.

 (d)  
See that the pressure decreases a small quantity, and becomes stable at a constant pressure display.

 NOTE: This pressure decrease occurs when the vent valve sets.
____
 (e)  
If the pressure continues to decrease, visually examine the oil system for leaks.

 (f)  
If you cannot find the leak, use a soap suds solution or a leak detector fluid to examine the oil system for leaks.

 (g)  
Remove the pressure from the generator drive.