(c)  
The rudder moves but you did not move the rudder pedals.

 (d)  
You must push unusually hard to move the rudder pedals.

 H. Put the Airplane Back to Its Usual Condition
 S 086-223
 (1)  If you used the ammeter procedure, do these steps
 (a)  Disconnect the cable assembly from the standby EMDP and the electrical connector.
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A 737-300/400/500MAINTENANCE MANUAL
 (b)  Connect the electrical connector to the standby EMDP.
 S 086-224
 (2)  If you used the flowmeter procedure, do these steps: (a) Open these circuit breakers: 1) P6-11 panel a) STBY HYD PUMP NORMAL 2) P6-12 panel a) STBY HYD PUMP ALTERNATE (b) Remove the flowmeter from the standby EMDP pressure line. (c) Close these circuit breakers: 1) P6-11 panel a) STBY HYD PUMP NORMAL 2) P6-12 panel a) STBY HYD PUMP ALTERNATE
 S 086-225
 (3)  If you used the amp-clamp and multimeter procedure, do these steps: (a) Disconnect the multimeter from the amp-clamp adapter. (b) Remove the amp-clamp. (c) Install the circuit breaker panel.
 S 616-226
 (4)  Fill the system B hydraulic reservoir (AMM 12-12-00/301).
 S 866-227
 (5)  Remove electrical power (AMM 24-22-00/201).

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737-300/400/500MAINTENANCE MANUAL
 HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________________________________
General (Fig. 1)
_______
 A.  The reservoir pressurizaton system components are located in the vicinity of the wheel well forward bulkhead and provide control of the air passing through to the hydraulic reservoirs. The air is provided from the left and right pneumatic systems (or APU) at a pressure of approximately 45 psi. The pressure provides positive fluid flow from the reservoir to the pumps, and maintains normal return pressure in the hydraulic system. The reservoir pressurization module is the major component and contains check valves, a filter, an orifice assembly, a manual air charging valve, and a test port. Also, common to each reservoir pressurization system are vents, restrictors, a reservoir depressurization (vent) valve, a pressure gage and a pressure relief valve.
Reservoir Pressurization Module (Fig. 2)
_______________________________
 A.  The module centralizes the functions of routing pressure to the A and B reservoirs, air charging, pressure bleeding and filtration.
 (1)  
Check valves prevent contamination of the pneumatic system with hydraulic fluid.

 (2)  
A test port provides for attachment of a pressure source for maintenance purposes or for installation of a gage for test purposes.

 (3)  
A manual air charging valve allows depressurization of the module and the lines up to the reservoir depressurization (vent) valve. It is also possible to attach an air charging unit at the bleed valve fitting for maintenance.

 (4)  
The cleanable filter prevents contamination of the system

 downstream.Restrictors (Fig. 2)
___________
 A.  One restrictor and one vent are positioned in each incoming line. The outgoing lines contain a vent and a tee valve assembly. The tee valve assembly contains a single check valve and a restrictor for each outgoing line. The restrictors will prevent a noticeable loss of pneumatic duct pressure should a downstream break in the system occur.
Vents
_____
 A.  Three vents are located in low portions of the lines to continually force contaminants and moisture out of the pressurization system. Two of the vents are located upstream of the reservoir pressurization module. The other vent is downstream of the reservoir pressurization module.
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