(a)  
Precise Tool NG2.0000-16 PTG THREADSNAP, used to examine the pitch diameter of the axle thread with undersized configuration.

 (b)  
Precise Tool NG2.0625-16 PTG THREADSNAP, used to examine the pitch diameter of the axle thread with original configuration.

 (2)  
CHF/PD - Axle external thread gage tool, Johnson Gage Co., Inc. (Optional)

 (3)  
Micrometer of appropriate size and accuracy, used to measure the major diameter of the axle thread.

 (4)  
Axle nut NO-GO Gage Tool for minor diameter.

 (a)  
Plug Gage, Landing Gear Nut, F80198-14, used to examine the minor diameter of the axle nut with original configuration or equivalent vendor tool Class X, 1.9949 Go/2.0034 NoGo with handle.

 (b)  
Plug Gage, Landing Gear Nut, F80198-15, used to examine the minor diameter of the axle nut with undersized configuration or equivalent vendor tool Class X, 1.9391 Go/1.9477 NoGo with handle.

 (5)  
Axle Nut NO-GO Gage Tool for pitch diameter.

 (a)  
NO-GO Gage, 2-1/16-16 UNS 3B NoGo member only with handle, pitch diameter 2.0272, used to examine the pitch diameter of the axle nut with original configuration.

 (b)  
NO-GO Gage, 2-16 UNS 3B NoGo member only with handle, pitch diameter 1.9647, used to examine the pitch diameter of the axle nut with undersized configuration.

 All the NO-GO gage tools, except for the F80198-XX, can be purchased from PRECISE TOOL and GAGE CO. INC., 13300 S.E. 30th St., Suite No. 201, Bellevue, WA 98005 USA Tel. No. (206) 746-1234/623-1120, Fax No. (206) 747-8131
 B.  Procedure
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A
737-300/400/500MAINTENANCE MANUAL
 S 226-004
 CAUTION:_______ MAKE SURE THAT YOU ATTACH A LABEL WHICH READS "CAUTION -
SPECIAL AXLE NUT IS NECESSARY" ALONG THE UPPER OUTER END OF THE
 AXLE SLEEVE ON THE AIRPLANES WITH REWORKED AXLES.  THE LABEL
 MUST HAVE YELLOW LETTERS ON A BLACK BACKGROUND.  IF NO LABEL IS
 ATTACH ON THE AXLE, THE INCORRECT AXLE NUT CAN BE INSTALLED.
 THE INSTALLATION OF INCORRECT AXLE NUT CAN CAUSE THE WHEEL TO

 FALL OFF DURING TAKEOFF OR LANDING.
 (1)  Do a check on the wear limits of the axle on the nose landing gear (Fig. 601).
 NOTE: A Johnson CHF/PD thread measuring system (or equivalent)
____ can be used as an option to measure the thread pitch diameter, but a separate set of pitch diameter rollers and a master thread plug gage is necessary for each size of thread. The plug gage is used to set the dial indicator of the measuring system before you measure the thread pitch diameter. The major diameter can be measured with a micrometer.
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A 737-300/400/500MAINTENANCE MANUAL

Nose Gear Axle Wear Limits
Figure 601 (Sheet 1)

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A 737-300/400/500MAINTENANCE MANUAL
NO. INDEX  PART NAME  DIM.  DESIGN LIMITS  WEAR LIMITS  WORN PART REPLACE  PART WORN REPAIR  INSTR. REPAIR 
DIAMETER  PER-MITTED WEAR DIM.  DIA MAX ANCE CLEAR-
MIN  MAX 
1 7  AXLE 1  2.0595 4  2.0625  2.048  X  6 
2  2.0189 5  2.0219  2.009  X 6 
1 8  AXLE  1  1.9910  1.9940  1.986  X 
　
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