NO. INDEX  PART NAME  DIM.  DESIGN LIMITS  WEAR LIMITS  WORN PART REPLACE  PART WORN REPAIR  INSTR REPAIR 
DIAMETER  PER-WEAR MITTED DIM. 6  DIA MAX ANCE CLEAR-
MIN  MAX 
1  BUSHING  ID  1.2495  1.2510  1.2540  0.0070  X  1 
SPACER  OD  1.2490  1.2496  1.2470  X 
2  BEARING  ID  1.2495  1.2500  1.2530  0.0070  X 
SPACER  OD  1.2490  1.2496  1.2560  X 
3  BEARING  ID  0.9995  1.0000  1.0035  0.0065  X 
BOLT  OD  0.9992  0.9997  0.9970  X 
4  BUSHING  ID  0.9995  1.0005  1.0032  0.0065  X  2 
BOLT  OD  0.9992  0.9997  0.9967  X 
5  SPACER  ID  0.8751  0.8757  0.8783  0.0065  X 
BOLT  OD  0.8744  0.8750  0.8718  X 
6  BUSHING  ID  0.5000  0.5015  0.5030  0.0055  X  3 
BOLT  OD  0.4985  0.4995  0.4975  X 
7  BUSHING  ID  0.5015  0.5030  0.5035  0.0055  X 
BOLT  OD  0.4985  0.4995  0.4980  X 
8  BUSHING  ID  0.7500  0.7515  0.7530  0.0060  X  4 
BUSHING  OD  0.7480  0.7490  0.7470  X 
9  BEARING  ID  0.4995  0.5000  0.5020  0.0055  X 
BOLT  OD  0.4985  0.4995  0.4965  X 

Wear Limits of the Forward Door Bellcrank for the Nose Wheel Well
Figure 601 (Sheet 3)

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A
747-400
MAINTENANCE MANUAL

NO. INDEX  PART NAME  DIM.  DESIGN LIMITS  WEAR LIMITS  WORN PART REPLACE  PART WORN REPAIR  INSTR REPAIR 
DIAMETER  PER-WEAR MITTED DIM. 6  DIA MAX ANCE CLEAR-
MIN  MAX 
10  BUSHING  ID  0.7500  0.7515  0.7530  0.0060  X  4 
BOLT  OD  0.7480  0.7490  0.7470  X 
11  BUSHING  ID  1.0000  1.0015  1.0025  0.0065  X  5 
BUSHING  OD  0.9970  0.9980  0.9860  X 

INSTALL BUSHING PER 20-11-01 WITH TOUCH FIT OF 0.0007-0.0027 INCH.  MAXIMUM OVERSIZE 
BUSHING AND HOLE IN FITTING IS 1.520 INCH, IF IT IS NECESSARY. 
INSTALL BUSHING PER 20-11-01 WITH TOUCH FIT OF 0.0005-0.0025 INCH.  MAXIMUM OVERSIZE 
BUSHING AND HOLE IN FITTING IS 1.230 INCH, IF IT IS NECESSARY. 
INSTALL BUSHING PER 20-11-01 WITH TOUCH FIT OF 0.0003-0.0018 INCH.  MAXIMUM OVERSIZE 
HOLE IN FITTING IS 0.767 INCHES, IF IT IS NECESSARY. 
INSTALL BUSHING PER 20-11-01 WITH TOUCH FIT OF 0.0004-0.0023 INCH.  MAXIMUM OVERSIZE 
BUSHING AND HOLE IN FITTING IS 1.079 INCH, IF IT IS NECESSARY. 
INSTALL BUSHING PER 20-11-01 WITH TOUCH FIT OF 0.0005-0.0025 INCH.  MAXIMUM OVERSIZE 
BUSHING AND HOLE IN FITTING IS 1.277 INCH, IF IT IS NECESSARY. 

YOU CAN HAVE MORE THAN THE LIMITS SHOWN IF YOU DO NOT HAVE MORE THAN THE MAXIMUM CLEARANCE.
Wear Limits of the Forward Door Bellcrank for the Nose Wheel Well
Figure 601 (Sheet 4)

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747-400 MAINTENANCE MANUAL
 EXTENSION AND RETRACTION - DESCRIPTION AND OPERATION
____________________________________________________
General
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 A.  The extension and retraction of all landing gear and the applicable wheel well doors operates hydraulically. The movement of the shock struts of the landing gear operates the shock strut doors. A safety solenoid stops the movement of the control lever for the landing gear to the up position. This occurs when the indication from the position sensors of the landing gear show the airplane is on the ground.
　
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