Parking Brake Accumulator Charging Valve Installation
Figure 401

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 D. Remove the Accumulator Charging Valve
 S 864-007
 (1)  
Fully push the brake pedals down a minimum of seven times to remove the pressure from the accumulator charging valve.

 S 844-008

 (2)  
Remove the dust cap from the accumulator charging valve (Detail A).

 S 864-025
 WARNING:_______DO NOT LOOSEN THE ACCUMULATOR CHARGING VALVE. PRESSURE IN THE VALVE CAN BLOW THE VALVE OUT AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  
Loosen the swivel nut on the accumulator charging valve to release the charge pressure.

 S 034-010

 (4)  
Loosen the valve body.

 S 024-011

 (5)  
Remove the valve body from the valve/plug adapter in the manifold.

 S 034-012

 (6)  
Discard the O-ring from the accumulator charging valve.

 TASK 32-44-10-404-013
 3.  Install the Accumulator Charging Valve on the Parking Brake (Fig. 401)___________________________________________________________
 A. Consumable Materials
 (1)  
D00054 Lubricant - Hydraulic System Fittings
 MCS 352

 B.
References

 (1)  
AMM 12-15-04/301, Parking Brake Accumulator

 (2)  
AMM 29-11-00/201, Pressurize/Depressurize Main Hydraulic System

 C.
Access

 (1)  
Location Zones
 197 Wing-to-Body Aft Lower Half (Left)

 (2)  
Access Panels
 197KL Central Hydraulic Service Center

 D.
Install the Accumulator Charging Valve

 S 644-014
 (1)  Apply a thin layer of lubricant to the new O-ring and the threads of the accumulator charging valve.
 

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 S 434-015
 (2)  
Install the new O-ring on the accumulator charging valve.

 S 424-016

 (3)  
Install the valve body in the adapter on the support bracket.

 S 864-017

 (4)
Pressurize the accumulator at the charging valve (AMM 12-15-04/301).

 S 844-018

 (5)  
Install the dust cap on the accumulator charging valve.

 S 864-019

 (6)  
Pressurize the right hydraulic system and reservoir
 (AMM 29-11-00/201).

 S 844-020

 (7)
Make sure there are no leaks on the accumulator charging valve.

 E.
Put the Airplane Back to Its Usual Condition

 S 844-021
 (1)  
Set the parking brakes.

 S 094-022

 (2)  
Remove the chocks from the wheels.

 S 844-023

 (3)  
Close the service center Door, 197KL, for the center hydraulics system.

 S 864-024

 (4)  
Remove the pressure from the right hydraulic system if it is not necessary (AMM 29-11-00/201).

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 TIRES AND WHEELS - DESCRIPTION AND OPERATION
____________________________________________
 1.  General_______
 A.  The airplane is supported by 10 wheel and tire assemblies; two on the nose landing gear, and four on each main landing gear truck.
 B.  Two spin brakes stop spinning of the nose wheels on retraction.
 2.  Component Details_________________
 A.  Main Gear Wheels (Fig. 1)
________________
 (1)  
On Dunlop wheels, the main landing gear wheels are made from forged aluminum and are a split wheel assembly to ease tire mounting. The inner surface of the rim of each wheel half is the sealing surface against which the tire bead rests. The inner and outer wheel halves are mated and fastened together with 18 equally spaced tie bolts, secured with washers and nuts. Leakage of air from the tire through the wheel half mating surfaces is prevented by a packing mounted on the surface of the inner wheel half. Another packing mounted on the inner surface of the inner wheel half seals the hub area of the wheel against dirt and moisture. Nine rotor drive keys installed in the inner wheel half rotate the brake rotors as the wheel turns. Stainless steel heat shields mounted underneath and between the inserts, keep excessive brake generated heat from the wheel and tire.
　
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