S 038-015
 (8)  
Supply a support for the torsion links and remove the bolt (10) to disconnect the upper and lower torsion links.

 S 038-016

 (9)  
Supply a support for the inner cylinder and move the nose wheels forward.

 NOTE: Do this until the inner cylinder is fully removed from the
____
 outer cylinder.

 S 038-017
 (10)
 Remove the retainer rings, upper cam, upper bearing, snubber valve, and key from the inner cylinder.

 (11)
 Remove the lower centering cam.

 S 038-018
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 028-063
 (12) Remove the active static-seal O-ring (17) and the backup rings (1) from the outer groove in the lower centering cam.
 NOTE: Use a plastic tool for this to prevent damage to the cam.
____
 S 028-064
 CAUTION:_______ YOU MUST BE VERY CAREFUL NOT TO CAUSE DAMAGE TO THE INNER
 CYLINDER.  NICKS OR SCRATCHES ON THE INNER CYLINDER WILL CAUSE
 DAMAGE TO THE CENTERING CAM AND THE SEALS.  THIS DAMAGE WILL
 OCCUR AS THE SEALS MOVE OVER THE DAMAGED SURFACE OF THE INNER
 CYLINDER.

 (13)
 Remove the active dynamic-seal assembly (16) from the inner cylinder.

 S 648-021

 (14)
 Lubricate all the new seals and backup rings with a layer of hydraulic fluid and petrolatum.

 S 428-079

 (15)
 Carefully pull the spare static-seal O-ring (4) and spare dynamic-seal assembly (5) over and down the inner cylinder.

 S 428-065

 (16)
 Put the spare static-seal O-ring (4) and spare dynamic-seal assembly (5) in the correct grooves in the lower bearing.

 S 428-023

 (17)
 Carefully pull the new active dynamic-seal assembly (16) over and down the inner cylinder to a position above the lower bearing (6).

 (a)
Install the HATSEAL II or RSA active dynamic-seal assemblies.

 1)  Clean and lubricate the parts which must be assembled (the inner diameter at the lower centering cam and the outer diameter of the inner cylinder's chrome area).
 2) Secure the inner cylinder in a horizontal position at approximately waist height. 3) Put the cam ring and the seal ring on the chrome area of the inner cylinder. 4) Put the elastomer on the tapered area of the inner cylinder (Fig. 801 Sheet 2, Detail A). 5) Put the lower centering cam on the tapered area of the inner cylinder. 6) Use your fingers or a blunt tool to push the elastomer into the lower centering cam (Fig. 801 Sheet 2, Detail A).
 7)  At the same time, push and turn the lower centering cam to the seal ring and the cam ring (Fig. 801 Sheet 2, Detail B).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 428-024
 (18)
 Carefully pull the new active static-seal O-ring (17) over and down the inner cylinder.

 S 428-066

 (19)
 Put the new active static-seal O-ring (17) in the outer groove of the lower centering cam (2).

 NOTE: After you install the O-ring, install new backup rings (1) on
____
 each side of the O-ring.

 S 428-078
 (20) Assemble the lower cam, upper cam, upper bearing, snubber valve, key, and retainer rings to the inner cylinder.
 NOTE: Make sure the clearance between the upper cam and the
____ spacer is 0.005 inch maximum after you install the retainer rings. Use a feeler gage to measure the clearance. If the clearance is more than 0.005 inch, refer to the Overhaul Manual.
 S 498-074
 (21)
 Use ring compressor to compress the piston ring before you install the inner cylinder into the outer cylinder.

 S 438-026

 (22)
 Install the inner cylinder in the outer cylinder.