B.  Cable tensiometer - 0- to 300-pound range for 1/8-diameter cable
C.  Grease - BMS 3-24 (Ref 20-30-21)
3.  Prepare for Removal
A.  Remove rudder systems A, B, and standby hydraulic power (Ref 27-21-0 MP).
B.  Install rigging pin R-5 in feel and centering unit output crank (Fig. 402).
4.  Remove Rudder Forward Quadrant
A.  Remove nose wheel well forward overhead access panels and open lower nose compartment door 1103.
B.  Loosen both rudder cables.
CAUTION:  RUDDER CABLES MUST BE LOOSENED OR DISCONNECTED FROM QUADRANTS BEFORE DISCONNECTING BUS ROD. RELIEVE TENSION UNIFORMLY IN BOTH CABLES.
C.  Disconnect cable from quadrant to be removed (Fig. 401).
D.  Disconnect busrod and tension rods from quadrant.
501 
Feb 20/88  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-21-51 Page 401 

E.  Remove bearing plate from bottom of right-hand jackshaft assembly. If removing left quadrant remove rudder pedal steering arm from bottom of jackshaft assembly. If removing right quadrant, remove rudder position sensor cables and quadrant per instructions in Chapter 31, Instruments.
F.  Remove aft two rudder pedal adjust shaft clamps.
G.  Remove bolts holding adjustment shaft support bracket to structure and jackshaft support channel.
H.  Disengage adjustment shaft by pulling shaft and support bracket forward.
I.  Remove bolts holding jackshaft support channel to structure and remove channel.
NOTE:  Support quadrant during this step. It will be free to fall from upper housing. At this point lower bearing may be replaced by removing four bolts holding bearing housing to jackshaft support channel.
J.  Slide jackshaft assembly and quadrant aft and outboard and remove from airplane.
5.  Prepare for Installation
A.  Remove rudder systems A, B, and standby hydraulic power. Refer to 27-21-0.
B.  Check that rigging pin R-5 is installed in feel and centering unit output crank. (See figure 402.)
6.  Install Rudder Forward Quadrant
A.  Position jackshaft assembly and quadrant and slide upper end of jackshaft assembly into upper bearing. (See figure 401.)
B.  Attach jackshaft support channel to structure and torque bolts.
C.  On right forward quadrant, and jackshaft assembly, install rudder position sensor quadrant to bottom of jackshaft assembly and connect cables per instructions in Chapter 31. Lockwire screws together. On left quadrant attach rudder pedal steering arm to bottom of assembly. Install lockwire and cotter pin.
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27-21-51 Page 402  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 15/73 

G07177
500  Rudder Forward Quadrant Installation 
Feb 15/72  Figure 401 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-21-51 Page 403 

D.  Install rigging pins R-3 and R-4 in forward rig pin holes of each quadrant and rigging pins R-1 and R-2 in rudder pedal arms.
E.  Connect quadrant busrod. Adjust as necessary so that rig pins R-3 and R-4 fit freely.
F.  Check that gap between cable guard block and quadrant is 0.03 to 0.05 inch (See figure 401). Add or remove shims if necessary.
G.  Remove rigging pins R-3 and R-4.
H.  Position captain’s forward quadrant so that rigging pin R-3 can be inserted through aft rigging pin hole in quadrant. Check that maximum gap between quadrant and quadrant stop is 0.06 inch. Add or remove shims as necessary.
I.  Remove rigging pin R-3. Position first officer’s forward quadrant so that rigging pin R-4 can be inserted through aft rigging pin hole in quadrant. Check gap between quadrant and quadrant stop per step H.
J.  Install rigging pins R-3 and R-4 through forward rigging pin holes in both quadrants.

G07178
Rudder Forward Quadrant Installation  500 
27-21-51 Page 404  Figure 401 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 15/78 

K.  Slide rudder pedal adjustment shaft into jackshaft assembly and attach adjustment shaft support bracket to structure. Install tube clamps.
L.  Set rudder pedal adjustment shaft to rudder pedal neutral position.
(1)  
Turn rudder pedal adjustment crank to full aft position and count number of turns while cranking from full aft to full forward position.

(2)  
Turn crank half this number of turns from either end to obtain neutral position.