ENGINE THRUST SHAFT - REMOVAL/INSTALLATION
1. General
A. The engine thrust shaft transmits engine control cable motion thru the strut firewall to the engine thrust push-pull cable. Prior to the removal of the engine thrust shaft, the engine start shaft must be removed. This procedure is given in 76-11-41, Removal/Installation. Following removal of the engine start shaft, the cable guard assembly and engine thrust drum are removed from the upper part of the control drum and shaft assembly. The thrust shaft is then worked down thru the drum and shaft assembly. This procedure may require prior removal of the power plant to assist thrust shaft removal.
B. Replacement of shaft bearings is anticipated to be the primary maintenance required on the engine thrust shaft. Following thrust shaft removal, the bearings may be examined for condition, and if necessary, replaced prior to shaft reinstallation.
2. Prepare to Remove Engine Thrust Shaft
A. Remove engine start shaft (Ref 76-11-41, Removal/Installation).
B. Clamp appropriate thrust lever against aft stop on control stand.
C. Remove power plant, if required to assist thrust shaft removal (Ref Chapter 71, Power Plant).
D. Gaining access thru extended leading edge flaps, remove turnbuckle locking clips of two thrust cables of applicable engine in wing leading edge. Loosen two thrust control cables using the turnbuckles.
3. Remove Engine Thrust Shaft
A. Remove four screws (1), spacers (2), washers (3) and locknuts (4) securing cable guard bracket (23) to support bracket (17) (Fig. 401).
B. Remove two thrust cable end fitting cotter pins (24) from engine thrust drum (20). Remove and tag cables to identify function and location.
C. Cut lockwire and remove nut (10) and washer (11) from lower end of engine thrust shaft (13). Remove engine thrust crank (12) from thrust shaft.
500
Aug 15/77 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 76-11-51 Page 401
Engine Thrust Shaft Installation 501
76-11-51 Figure 401 (Sheet 1) Feb 15/69
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
D. Cut lockwire and remove nut (22) and washer (21) from upper end of engine thrust shaft (13). Remove engine thrust drum (20) from thrust shaft.
E. Remove thrust shaft upper bearing (19) and spacer (18).
F. Remove five screws (5), washers (7), and locknuts (8) securing lower support bracket (9) to firewall and remove bracket.
G. Carefully pull engine thrust shaft (13) down thru support bracket (17). As shaft moves down thru support bracket, remove thrust reverser control cam (15) as it is pushed off the shaft upper end.
H. Push down on spacer (14) and remove spacer (14) and thrust shaft lower bearing (6).
4. Install Engine Thrust Shaft
A. Install thrust shaft lower bearing (6) down on thrust shaft (13) shoulder. Install spacer (14) on thrust shaft (13) above bearing (6).
B. Position thrust reverser control cam (15) over shaft opening on lower portion of support bracket (17). Control cam (15) should be below thrust reverser follow-up crank (16).
C. Slowly insert thrust shaft (13) up thru support bracket (17) and thrust reverser control cam (15) with indexing (wide) tooth and valley mated.
D. Push thrust shaft up until lower bearing seats against flange in support bracket.
500 Engine Thrust Shaft Installation
Nov 15/67 Figure 401 (Sheet 2) 76-11-51
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
E. Install spacer (18) and thrust shaft upper bearing (19) on thrust shaft (13) above thrust reverser control cam (15).
F. Install engine thrust drum (20) on engine thrust shaft (13) with indexing (wide) tooth and valley mated.
G. Secure thrust drum using washer (21) and nut (22). Tighten nut to torque of 200 to 500 pound-inches and lockwire to thrust drum (20).
H. Position lower support bracket (9) on strut lower firewall over engine thrust shaft. Insert five screws (5) thru support bracket, strut firewall, and lower support bracket and secure with washers (7) and locknuts (8).
I. Position engine thrust push-pull cable bracket over push-pull cable support bracket studs.
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