4. Procedure
_________ (Ref. Fig. 405/TASK 32-21-13-991-006) Subtask 32-21-13-020-053
A. Preparation for Removal WARNING : BEFORE YOU REMOVE PARTS FROM THE SHOCK ABSORBER, MAKE SURE THAT
_______ YOU MAKE MATCHMARKS WITH A FELT-TIP MARKER. THIS IS VERY IMPORTANT. IT WILL LET YOU INSTALL THE PARTS IN THE CORRECT POSITION WHEN YOU ASSEMBLE THE SHOCK ABSORBER AGAIN. INCORRECT ASSEMBLY OF THE SHOCK ABSORBER IS DANGEROUS FOR AIRCRAFT SAFETY.
(1)
Before you remove the cylinder (3), make a mark with a felt tip marker to show the position of the sliding tube (9), upper cam (7), cylinder (3).
(2)
Carefully remove the sealants with a spatula.
(3)
Make sure that the shock absorber is fully depressurized and fully compressed
WARNING : BEFORE, DISASSEMBLY MAKE SURE THAT YOU RELEASE ALL THE
_______ NITROGEN PRESSURE FROM THE SHOCK ABSORBER. REMAINING PRESSURE CAN CAUSE DAMAGE TO THE SHOCK ABSORBER AND INJURY TO PERSONS.
(a)
If not, remove the cap (1) and slowly open the valve (2) by one and a half turn maximum.
(b)
Fully compress the shock absorber.
(4) Drain the fluid of the shock absorber. Subtask 32-21-13-020-054
B. Disassembly of the Shock Absorber
(1) Remove the retaining ring (4) with the PIN WRENCH (M46201).
(a) Turn the retaining bush (5) to align its open groove with the 1.6 mm (0.0629 in.) dia. hole at the end of the upper cam (7).
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NLG Shock Absorber - Dynamic Seals Figure 405/TASK 32-21-13-991-006
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(b)
Put a rod in the 1.6 mm (0.0629 in.) dia. hole.
(c)
Turn the retaining bush (5) with the PIN WRENCH (M46201). This causes the retaining ring (4) to move so that you can hold it without damage to the upper cam (7).
(2)
Remove the retaining bush (5) and the eight dowels (6).
(3)
Carefully remove the cylinder (3) and the upper cam (7) together.
(4)
Remove the upper cam (7). Subtask 32-21-13-020-055
C. Removal of the Dynamic Seals from the Upper Cam (7)
(1)
Remove the seal (11) and the back-up rings (10) with the SPATULA (89901) and discard them.
(2)
Remove the seal (12) with the SPATULA (89901) and discard it.
(3)
If necessary, remove the scraper (13) and discard it. Subtask 32-21-13-210-051
D. Cleaning of the Retained Part :
WARNING : USE SOLVENTS/CLEANING AGENTS, SEALANTS AND OTHER SPECIAL
_______ MATERIALS ONLY WITH A GOOD SUPPLY OF AIR. OBEY THE MANUFACTURERS INSTRUCTIONS. PUT ON PROTECTIVE CLOTHING. DO NOT GET THEM IN YOUR MOUTH. DO NOT SMOKE. DO NOT BREATHE THE GAS. THESE MATERIALS ARE POISONOUS, FLAMMABLE AND SKIN IRRITANT. GET MEDICAL HELP IF YOUR SKIN OR EYES BECOME IRRITATED.
CAUTION : DO NOT USE SOLVENTS THAT CONTAIN CHLORINE TO CLEAN PARTS WITH A
_______
RILSAN COATING.
(1)
Clean the parts that have grease with CLEANING AGENTS (Material No. 11-004).
(2)
Clean all the parts with CLEANING AGENTS (Material No. 11-002) and dry them with filtered compressed air.
(3)
Fully clean the seal grooves on the upper cam (7).
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(4) Make sure that the parts retained from the removed component are clean and in the correct condition.
(5) Do an inspection of the component interface and/or the adjacent area. Subtask 32-21-13-420-053
E. Installation of the Dynamic Seals on the Upper Cam (7)
NOTE : You must install the seals dry.
____ Do not stretch the seals more than necessary when you install them.
(1)
Before installation of the new seal (12),assemble the elastomer seal and the back-up ring together
(2)
Install the new seal (12) in the correct direction with the SPATULA (89901) on the upper cam (7). (Ref. Fig. 405/TASK 32-21-13-991-006)
(3)
If necessary, install the new scraper (13) on the upper cam (7).
(4)
Install the new seal (11) and the new back-up rings (10) with the SPATULA (89901) on the upper cam (7).
Subtask 32-21-13-420-054
F. Assembly of the Shock Absorber CAUTION : ALWAYS INSTALL THE SAME LOWER CAM WITH THE SAME UPPER CAME THEY
_______
ARE A MATCHED ASSEMBLY AND MUST STAY TOGETHER.
(1)
Apply HYDRAULIC FLUIDS (Material No. 02-001) to the surface of parts that touch the seals (10) and (12).
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