A

BRACKET
A
CABLE PULLEY C BRACKET (2 LOCATIONS)
RIGHT SHAFTSUMMING BRACKETCABLE PULLEY LEFTLEVER(2 LOCATIONS) SUMMINGBOLT LEVER
BUSHING LEFT
BUSHING BUSHING LINK
BOLT AND
BOLT BUSHING
COMPENSATOR CAM B
BOLT AND
B
BOLT BUSHINGBUSHING
BUSHING
BEARING
CONNECTING ROD BUSHING
INPUT LEVER

BRACKET WASHER NUT
RIGHT LINK
A-A
CABLE COMPENSATOR CAM
RIGHT LINK
LEFT LINK
B-B
Nose Wheel Steering Summing Mechanism and Cable Compensator Installation
Figure 401 (Sheet 2)

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757 MAINTENANCE MANUAL
 F. Procedure to Remove the Summing Mechanism
 S 034-034
 CAUTION: DO NOT LET THE TORSION LINKS FALL FREELY WHEN YOU DISCONNECT
_______
 THE TORSION LINKS. DAMAGE TO THE TORSION LINKS OR THE
 PROXIMITY SENSORS AND TARGETS CAN OCCUR.

 (1)  
Disconnect the nose gear torsion links at the apex joint
 (AMM 32-21-09/401).

 S 864-008

 (2)  
Put the steering collar for the nose landing gear in the center, not more than 1/4 degree from the center.

 S 494-009

 (3)  
Install the rig pins NS1 and NS2 in the captain's forward quadrant and the interconnect mechanism (AMM 32-51-00/501).

 S 034-010

 (4)  
Remove the cover of the summing mechanism (Detail A).

 S 024-011

 (5)  
Remove the metering valve for the nose wheel steering
 (AMM 32-51-12/401).

 S 034-012

 (6)  
Remove the fasteners (6) that attach the cover brackets to the bracket for the summing mechanism.

 S 034-013

 (7)  
Loosen the turnbuckles for the NWSA and NWSB cables.

 (8)  
Remove the pulley center bolts.

 S 034-015

 (9)  
Remove the three bolts that hold the bracket for the summing mechanism to the plate that holds the lower steering collar (Detail C).

 (10)
 Remove the summing mechanism and bracket as a unit.

 S 034-014
 S 024-016
 

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 S 034-017
 (11)
 Do the steps that follow to disassemble the mechanism, if it is necessary:

 (a)  
Remove the bolts that connect the brackets for the left and right control cable pulleys to the left and right summing control levers (View A-A).

 (b)  
Remove the cable compensator shaft (Views A-A and B-B).

 (c)  
Remove the summing levers, cable compensator, and the input lever (Views A-A and B-B).

 TASK 32-51-09-404-002
 3.  Install the Summing Mechanism for the Nose Wheel Steering (Fig. 401)_________________________________________________________
 A. Equipment
 (1)  
Towing Lever Lockpin - A09003-1

 (2)  
Rig Pins: Kit B20003-XX (AMM 20-10-24/201).

 (a)  
NS1 - P/N B20003-20

 (b)  
NS2 - P/N B20003-24

 (c)  
NS3 - P/N B20003-5

 (d)  
NS5 - P/N B20003-5

 B.
References

 (1)  
AMM 32-21-09/401, Nose Gear Torsion Links

 (2)  
AMM 32-51-00/501, Nose Wheel Steering System

 (3)  
AMM 32-51-12/401, Nose Wheel Steering Metering Valve

 C.
Access

 (1)  
Location Zone
 711 Nose Landing Gear (NLG)

 D.
Procedure

 S 434-018
 (1)  
If you disassembled the summing mechanism, do the steps that follow to assemble the summing mechanism, pulleys and bracket as a unit:

 (a)  
Put the right and left summing levers, the cable compensator, and the input lever in their positions between the bracket arms.

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 (b) (c) (d) (e)  Install the cable compensator shaft (Views A-A and B-B).Install the nut to hold the assembly.Connect the brackets for the left and right cable pulleys to the left and right summing control levers.Tighten the bolts.
 (2)  S 424-019Put the summing mechanism, pulley and bracket assembly against the plate that holds the lower steering collar.
　
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