Ballscrew and Bearing Block Assembly 500
52-61-116 Figure 402 Aug 15/77
Page 404
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Ballscrew Alignment and Endplay Adjustment
Aug 15/77 Figure 403 52-61-116
Page 405
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
5. Install Ballscrew and Bearing Block Assembly (Fig. 402)
CAUTION: WHILE WORKING WITH BALLSCREW ASSEMBLIES, THE BALL NUT/TRUNNION
SHOULD BE TAPED IN PLACE TO PREVENT POSSIBLE DAMAGE. IF TRUNNION IS ALLOWED TO OVERRUN AFT ENDS OF BALLSCREW, INTERNAL THREADING COULD BE CROSSED OR STRIPPED.
A. Slide spacer onto splined end of ballscrew assembly, install with large diameter of spacer towards spline end of shaft.
B. Fit key into shaft.
C. Slide inboard bearing block assembly over splined end of ballscrew assembly rotating thrust race until key engages key slot of race. Slide block remainder of way until thrust race firmly seats against flanged end of spacer.
D. Install tab washer and nut. Tighten nut 70-100 pound-inches and bend locking tab against flat of nut.
E. Slide shims and spacer onto non splined end of ballscrew assembly.
F. Fit key into shaft.
G. Slide outboard bearing block assembly onto ballscrew assembly rotating thrust race until key engages key slot of race. Slide block remainder of way until thrust race firmly seats against spacer.
H. Install tab washer and nut. Tighten nut 70-100 pound-inches.
NOTE: Do not bend tab of washer until an end play check has been carried out and is satisfactory.
I. Apply a film of grease to ballscrew splines, bevel gearbox splines and splined coupling, then slide splined coupling onto ballscrew splines and bevel gearbox splines.
J. Attach outboard ballscrew bearing block to carriage assembly with bolts and nuts.
K. Attach inboard ballscrew bearing block to carriage assembly with bolts and nuts.
52-61-116 Aug 15/77 Page 406
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
L. Check ballscrew endplay as detailed in 52-61-100, Inspection/Check. If outside limits proceed as follows:
(1)
Remove ballscrew outboard bearing block; refer Item 4.E. thru I, keeping ballscrew in horizontal plane.
(2)
Remove required amount of shims.
NOTE: Shims are laminated. Removal of some leaves from the shims will decrease endplay of ballscrew.
(3)
Install outboard bearing block, refer Item 5.E. thru H and bend tab of tab washer against nut.
M. Remove tape from ballscrew and ballnut/trunnion.
N. Slide splined coupling until coupling is out of mesh with ballscrew splines, then rotate ballscrew until ballnut trunnion is within 0.020 inch in line with other trunnion (Fig. 401). This can be measured with a vernier caliper or finely graduated ruler.
O. Slide splined coupling back into mesh with bevel gearbox splines, recheck 0.020-inch limit has not altered, then insert pin and cotter pin into splined coupling.
P. Assembly trunnion pickup fittings to truck assembly with washers and bolts. Lockwire bolts.
Q. Connect and secure detached linkages to truck assembly.
R. Lubricate ballscrew shaft and trunnion assembly with grease.
6. Restore Airplane to Normal
A. Remove No. 2 rig pin and disengage carriage drive pinions by moving carriage pinion
disconnect lever (2) to unlocked position.
B. Manually move carriage to retracted position and insert No. 2 rig pin through retract index slot
(4) and into retract index hole in aft beam of carriage.
C. Engage carriage drive pinions by moving carriage pinion disconnect lever (2) to locked position. Install safety wire on lever.
D. Remove No. 2 rig pin and connect electrical connector (3) to receptacle.
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