(c)
If it is necessary, adjust the thickness of the shims at the flanged bushings to get the .006 +.004/-.000 inch of total clearance.
(d)
On each side of the fitting on the midflap, install the failsafe bolts.
S 224-041
(8) Turn the ball nut on the screw so that the "X" dimension of the ballscrew is the same as it was at removal.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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737-300/400/500MAINTENANCE MANUAL
S 434-042
(9) Put the upstop on the screw yoke in the same position it was at the time of removal.
NOTE: This is the initial position of the upstop on the screw yoke
____ in relation to the output shaft. Installation of a ballscrew with the upstop on the screw yoke in this initial position, will help to decrease subsequent adjustment.
S 424-043
(10)
At the outboard flap transmissions, assemble the universal joint:
(a)
Assemble and align the transmission output shaft, the screw yoke and the trunnion cross.
(b)
Apply a layer of BMS 3-24 grease to the cross pin, the universal joint bolt and the spacer.
CAUTION:_______ASSEMBLE THE UNIVERSAL JOINT CAREFULLY. IF YOU DO NOT FOLLOW THE STEPS, INTERFERENCE BETWEEN THE NUT ON THE UNIVERSAL JOINT BOLT AND THE TRANSMISSION HOUSING CAN OCCUR.
(c)
Put the cross pin through the screw yoke and the trunnion cross.
(d)
Put the universal joint bolt through the output shaft, the trunnion cross, and the cross pin.
(e)
Put the spacer on the universal joint bolt.
(f)
Clean the threads of the universal joint bolt.
(g)
Apply a layer of BMS 5-95 sealant to the threads of the
universal joint bolt. ú (h) Install a new self-locking nut on the universal joint bolt. ú ú
NOTE:____Make sure that the run on torque of the nut is between ú 34-150 inch-pounds. ú ú (i) Tighten the nut to 170-200 pound-inches.
(j) Make sure that all the chamfer of the bolt shows when the nut is fully tightened.
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737-300/400/500MAINTENANCE MANUAL
G. Install the ballscrew of an inboard flap transmission (Fig. 403)
S 224-044
(1)
Turn the ball nut on the ballscrew so that "X" dimension is
approximately the same as it was at removal.
S 424-045
(2)
Put the ballscrew together with the screw yoke in the installed position on the airplane.
S 424-074
CAUTION: MAKE SURE THAT THE BALLSCREWS ARE INSTALLED ON THE CORRECT
_______ TRANSMISSIONS. A NO. 3 BALLSCREW CAN ATTACH TO A NO. 5 TRANSMISSION, AND A NO. 4 BALLSCREW CAN ATTACH TO A NO. 6 TRANSMISSION. THESE BALLSCREWS ARE NOT INTERCHANGEABLE, AND CAN CAUSE OPPOSITE MOVEMENT OF THE INBOARD FLAPS. DAMAGE CAN OCCUR.
(3)
Attach the ball nut to the gimbal.
(a)
On the No. 3 or No. 6 transmission, make sure that the ball nut is installed with the oil reservoir on the outboard side.
(b)
On the No. 4 or No. 5 transmission, make sure that the ball nut is installed with the oil reservoir on the inboard side.
(c)
On the top and bottom side of the gimbal, attach the ball nut to the gimbal. 1) Apply a layer of BMS 5-95 sealant to the outer surface of
the bushing.
2) Put the bushing on the gimbal.
NOTE: Make sure that the bushing engages the journal on the ball nut.
3) Install the two bolts that attach the bushing to the gimbal. a) Fill each of the two fastener holes used for the
bushing fasteners with BMS 5-95 sealant b) Install bolts in each of the two fastener holes for a
bushing. c) Install a washer and nut on each of the two bolts. d) Tighten the nut on each bolt to 30-40 pound-inches.
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