(f)  
Begin the refuel operation if any part of the landing gear is unusually hot.

 S 653-269
 (3)  
Make sure the wing pressure relief valves (two locations) at the wing surge tanks are closed.

 S 653-226

 (4)  
Damage or wear at the refuel receptacle adapter can cause fuel leaks. Do these maintenance actions to prevent fuel leaks:

 (a)  
Make sure the mating surface of the fuel hose and refuel receptacle adapter are clean and free from unwanted material.

 (b)  
Make sure the slots and lugs on the adapter are not damaged.

 (c)  
Make sure the defuel lever is correctly positioned.

 S 653-227
 (5)  
Make sure the landing gear wheel chocks do not touch the tires. The wheel chocks can wedge against the tire after you add fuel.

 S 653-228

 (6)  
A refuel operation with a main engine operating is an emergency procedure. Obey all airport and operator provided emergency procedures.

 I. Refueling Precautions
 S 653-229
 CAUTION: MAKE SURE YOU PUT THE SAME QUANTITY OF FUEL INTO THE NO. 1 TANK
_______ AND THE NO. 2 TANK. THE AIRPLANE WILL NOT FLY CORRECTLY AND DAMAGE TO THE WINGS CAN OCCUR.
 (1)  
Put approximately the same quantity of fuel in the No. 1 tank and the No. 2 tank (Fig. 302).

 S 653-230

 (2)  
If the center tank contains more than 1,000 pounds (453 kilograms) of fuel, you must fill the No. 1 tank and the No. 2 tank fully.

 NOTE: This requirement is applicable to the fuel configuration
____ for flight. Any quantity of fuel can be added to the center tank or transferred to the center tank from the No. 1 or No. 2 tank for ground maintenance (AMM 28-23-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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737-300/400/500MAINTENANCE MANUAL
 (3)  S 653-231If the No. 1 tank and the No. 2 tank are scheduled to be filled fully, it is not necessary to put a specified quantity of fuel in the center tank.
 (4)  S 653-234You can put fuel into all of the tanks at the same time or you can put fuel into each of the tanks in a sequence (Table 301).
 S 653-235

 CAUTION: DO NOT USE MORE THAN 55 PSI FUEL PRESSURE AT THE FUELING
_______ NOZZLE. IF YOU USE MORE THAN 55 PSI FUEL PRESSURE, YOU CAN CAUSE DAMAGE TO THE FUELING SYSTEM COMPONENTS.
 (5)  Make sure the fueling source does not pressurize the fueling system to more than 55 psi.
 NOTE: This pressure corresponds to a maximum fueling rate of 500
____ gallons per minute if you fuel all three tanks simultaneously.
 S 943-236
 CAUTION: MAKE SURE THERE IS NO EQUIPMENT BELOW THE WINGTIP DURING THE
_______ REFUEL OPERATION. DAMAGE TO THE EQUIPMENT OR AN EXPLOSION CAN OCCUR.
 (6)  Do not put ground equipment below the wingtip when you refuel the airplane.
 (a)  
The weight of the fuel pushes the wing down when you put the fuel in the tank.

 (b)  
The wingtip goes down more than the other parts of the wing.

 (c)  
Air comes out of the fuel tanks through the fuel vents in the wingtip.

 (d)  
Dangerous concentrations of fuel fumes occur at the wingtip.

 S 653-237
 CAUTION: DO NOT OPERATE THE HYDRAULIC SYSTEM WHEN THE TANK THAT CONTAINS
_______ THE HEAT EXCHANGER FOR THAT HYDRAULIC SYSTEM IS EMPTY. THE HYDRAULIC SYSTEM BECOMES TOO HOT IF THE HEAT EXCHANGER IS NOT COVERED BY THE FUEL.
 (7)  Do not operate a hydraulic system if the tank that contains the exchanger for that hydraulic system is empty.
 (a)  Make sure the fuel tanks No. 1 and No. 2 have a minimum fuel load of 1750 pounds (794 kilograms) per tank.
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