C. Align forward manifold assembly bearing hole with beam structure and install bushing, clevis bolt, three washers and two nuts. Using torque wrench C-27025-1, tighten larger nut 750 to 900 pound-inches and tighten smaller nut 450 to 590 pound-inches (View 1).
CAUTION: AFTER TIGHTENING SMALLER NUT, DO NOT RESET TORQUE FOR LARGER NUT. SMALLER NUT MAY BECOME LOOSE.
D. Install rod end bolt, two washers and two nuts, connecting rod assembly to rudder. Tighten larger nut 300 to 400 pound-inches and tighten smaller nut 350 to 400 pound-inches (section B-B).
CAUTION: AFTER TIGHTENING SMALLER NUT, DO NOT RESET TORQUE FOR LARGER NUT. SMALLER NUT MAY BECOME LOOSE.
E. Install main input rod as follows:
NOTE: You can install the vernier control rod with the vernier adjustment and in the forward or aft position. For easier adjustment of the control rod, install the vernier adjustment end at the forward position to align it with the access panel 9513.
(1)
On forward end of main input rod check that 7 +1 threads are exposed on rod, and on sleeve.
(2)
Position main input rod clevis over tongue on external summing lever (nutplate side down) per C-C Fig. 401 and install bolt assembly with two washers, through clevis and tongue. Tighten large nut on outer bolt to 45-60 pound-inches. Install nut over end of inner bolt. Tighten small nut to 12 to 15 pound-inches.
CAUTION: AFTER TIGHTENING NUT ON INNER BOLT, DO NOT RESET TORQUE FOR BOLT ON OUTER NUT. NUT ON INNER BOLT MAY BECOME LOOSE.
(3)
Position clevis at opposite end of main input rod over lug on torque tube input crank C-C per Fig. 401 and install fasteners per step (2).
F. If the unions and reducer fittings are not installed, apply the hydraulic fluid or the assembly lube to the O-rings and the fittings and install in the hydraulic ports.
CAUTION: TO PREVENT CROSS CONNECTION OF HYDRAULIC LINES, ENSURE THAT UNIONS AND REDUCERS ARE INSTALLED IN THE CORRECT PCU HYDRAULIC PORTS.
G. Connect electrical connector per detail A.
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H. Remove rigging pin R-5.
I. Disconnect nosewheel steering pushrod at forward quadrant.
NOTE: Nose gear steering rod need not be disconnected if airplane is jacked so that nose gear is fully extended.
J. Bleed rudder PCU and check for leakage.
(1)
Provide rudder systems A and B hydraulic power (Ref 27-21-0 MP).
(2)
Actuate rudder pedals to exercise rudder PCU until rudder motion is smooth and continuous.
(3)
Check for hydraulic leakage.
K. Adjust and test PCU (Ref 27-21-91 A/T).
6. Restore Airplane to Normal Configuration
A. Remove rudder systems A and B hydraulic power (Ref 27-21-0 MP).
B. Replace access panels.
C. Check hydraulic reservoirs and service, if required (Ref Chapter 12, Hydraulic Servicing).
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Aug 01/96 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-21-91 Page 407
RUDDER POWER CONTROL UNIT - ADJUSTMENT/TEST
EFFECTIVITY
AIRPLANES PRE-SB 27-1252
1. Rudder Power Control Unit Adjustment
A. Equipment and Materials
(1) Rigging Pins Kit - F70207-3, -52, -61, or -84:
REF NO. F70207-( ) DIAMETER (INCHES) LENGTH (INCHES) FUNCTION
R-5 -11 0.309-0.311 6.7 +0.25 Feel and Centering Mechanism
B. Prepare to Adjust Rudder Power Control Unit
(1)
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