S 428-019
CAUTION: MAKE SURE YOU CORRECTLY INSTALL THE DYNAMIC-SEAL ASSEMBLY IN
_______ THE OFFSET (REF FIG. 801). DAMAGE TO THE ASSEMBLY CAN OCCUR IF YOU INCORRECTLY INSTALL IT IN THE OFFSET.
(14)
Move the spare dynamic-seal assembly up the inner cylinder into the offset in the lower centering cam.
S 438-023
(15)
Move the lower bearing (6) up against the seal assembly and the bearing and centering cam together into the outer cylinder.
NOTE: The lower centering cam must come out of the lower end of
____ the outer cylinder by 0.03 to 0.06 inch. Make sure you align the upper centering cam and the lower centering cam. The notched slot of the lower cam must be in-line with the lobe of the upper cam. If you do not correctly align the centering cams, you cannot make the conditions of step (23).
S 438-024
(16) Move the scraper adapter (15) together with the scraper ring (7) against the lower bearing.
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737-300/400/500MAINTENANCE MANUAL
S 428-076
(17) Move the gland nut (8) into a position to attach it to the outer cylinder.
NOTE: If you have problems with the installation of the lower
____ bearing into the outer cylinder, do these steps. Align the inner cylinder. Put a wooden block of equal dimensions on the two sides of inner cylinder below the gland nut. Lift the inner cylinder until the gland nut touches the outer cylinder.
S 398-026
(18)
Apply corrosion preventive compound to the threads on the gland nut and the outer cylinder.
S 428-082
(19)
Tighten the gland nut to 175 - 200 foot-pounds.
NOTE: If it is necessary, loosen the gland nut slightly to align the slot for the installation of the gland nut lock.
S 438-028
(20)
Install the gland nut lock.
S 828-030
(21)
Make sure the length of the fully extended gear is 25.5 inches as shown on the nose gear servicing chart (Ref 12-15-41/301).
S 118-031
(22)
Clean the area for the new fillet seal with a new or clean white cloth and toluene.
S 398-032
(23)
Use a brush to apply a thin layer of primer to the area of the gland nut.
NOTE: You must let the primer dry a minimum of 1/2 hour before
____
you apply the sealant.
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737-300/400/500MAINTENANCE MANUAL
S 398-033
(24)
Apply the sealant.
(a)
Apply a bead of sealant around the outer cylinder of the shock strut and the gland nut.
NOTE: Use a sealant gun for this.
____
(b) Use a spatula or the end of the sealant gun to make the fillet smooth.
NOTE: When you make the fillet smooth, decrease the number of
____ air bubbles in the fillet as much as possible.
NOTE: If the sealant bonds to the tool, apply a solution
____ of 15 to 20% isopropyl alcohol in distilled water to the tool. Use a polyethylene squirt bottle to apply the solution. This will prevent the contamination of the solution.
(c) Make the fillet a minimum of 0.08 inch thick at the interface of the gland nut and the shock strut. The fillet must extend 1/8 to 1/4 inch out on the gland nut and up the shock strut.
NOTE: Make the fillet smooth immediately after you apply
____ the sealant. Do this because the fillet makes a skin a short time after it touches the air.
I. Put the Airplane in the Normal Condition
S 588-034
(1)
Lower the inner cylinder of the nose gear and remove the jack.
S 438-035
(2)
Connect the wire harness plug for the taxi light and safety the plug with lockwire with the double twist method.
NOTE: Make sure to install the clamps on the wire harness at
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