B. Equipment
 (1)  Tube Coupling Assembly - BACC42W( ),
 (Sierracin/Harrison, 3020 Empire Way, Burbank,
 California)

 NOTE: The number after the W in the
____
 part number gives the size of the
 coupling in sixteenths. For example,
 BACC42W6 fits 3/8-inch tube size. The
 BACC42W is superceded by BACC42W-T which
 is used on Ti-3AL-2.5V and all other
 hydraulic tubing. You can use BACC42W
 on all hydraulic tubes except
 Ti-3AL-2.5V.

 (2)  Consumable Materials
 (a)  
G00270 Masking Tape

 (b)  
B01000 Solvent - General Cleaning of Metal
 (Series 80)

 C. Procedure
 S 868-171
 CAUTION: DO NOT TIGHTEN THE COUPLING ASSEMBLY BY HAND AFTER YOU REMOVE
_______ IT FROM THE SHIPPING CONTAINER OR BEFORE YOU INSTALL IT ON THE TUBE. THE COUPLING ASSEMBLY HAS NO MORE THAN ONE THREAD ENGAGED. YOU CAN COMPRESS THE UNION AND MAKE THE COUPLING ASSEMBLY DIFFICULT TO PUT IN POSITION.
 (1)  Remove pressure from the systems where you will do repairs.
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737-300/400/500MAINTENANCE MANUAL
 S 118-172
 WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH OR YOUR EYES, OR ON YOUR
_______ SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO THE ENVIRONMENT. REFER TO PRODUCT MATERIAL SAFETY HANDLING DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FORPROPER HANDLING PROCEDURES.
 (2)
Use solvent, Series 80 (AMM 20-30-80/201) to clean the tube in the

 (5)  
Install tape on the nut side of the clearance with a minimum of 0.56 inch from the tube end and a maximum of 0.675 inch from the center of the clearance (Fig. 822).

 S 948-176

 (6)  
Use the same measurements to make a mark (index line) on the coupling side of the tube.

 S 948-177

 (7)  
Find and make a mark (marking dots) on the nut and coupling side of the tube (Fig. 822).

 area where you will install the H-coupling.
 (3)  S 358-173Cut the tube.
 (4)  S 118-174Chamfer and remove burrs from the ID and OD edges. with solvent, Series 80 (AMM 20-30-80/201). Clean the edges
 S 948-175

 NOTE: These marks will be used for the last inspection check
____ (dimension "C").
 S 428-178
 (8)  
Install the coupling assembly over the coupling side of the tube.

 S 218-179

 (9)  
Make sure the large radius and the large diameter end of the sleeve are toward the center of the union.

 S 438-180

 (10)
 Install the nut and sleeve over the tape on the nut side of the tube.

 S 218-181

 (11)
 Make sure the sleeve large bore is toward the clearence.

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737-300/400/500MAINTENANCE MANUAL
 S 828-182
 (12)
 Align the tubes and move the union until it touches the tape on the nut side on the tube.

 S 218-183

 (13)
 Make sure the union meets or covers the index line on the coupling side of the tube.

 S 948-184

 (14)
 Install tape on the coupling side of the tube, with the tape edge even with the end of the union.

 S 438-185

 (15)
 Push the sleeve and coupling body on the ends of the union.

 NOTE: Make sure the tape does not move and the coupling body
____
 does not turn.

 S 838-186
 (16)
 Engage the threads of the nut with the coupling body and tighten the nut handtight.

 S 438-187

 (17)
 Hold the coupling body with a wrench and tighten the coupling assembly nut to the stop.
　
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