# @A318/A319/A320/A321 AIRCRAFT MAINTENANCE MANUAL ** On A/C ALL Task 57-26-13-400-004-A Installation of the Bearing Seals of the MLG Actuator Bearing Assembly
WARNING : PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR: - THE FLIGHT CONTROLS - THE FLIGHT CONTROL SURFACES - THE LANDING GEAR AND THE RELATED DOORS - COMPONENTS THAT MOVE.
WARNING : MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR.
WARNING : BE CAREFUL WHEN YOU USE THE CONSUMABLE MATERIAL(S). YOU MUST OBEY THE OPERATOR’S AND MANUFACTURER’S HEALTH AND SAFETY INSTRUCTIONS. 1. Reason for the Job Self Explanatory 2. Job Set-up Information A. Fixtures, Tools, Test and Support Equipment REFERENCE QTY DESIGNATION No specific AR ACCESS PLATFORM 3M (10 FT) No specific AR WARNING NOTICE(S) B. Consumable Materials REFERENCE DESIGNATION Material No: 04-004 COMMON GREASES SYNTH. ESTER BASED GREASE HIGH PRESSURE Material No: 11-026 CLEANING AGENTS SOLVENT GENERAL PURPOSE Material No: 19-003 LINT-FREE COTTON CLOTH C. Expendable Parts FIG.ITEM DESIGNATION IPC-CSN 5 dowel pins 57-26-13-01-040 3 seal 57-26-13-01-050 4 seal 57-26-13-01-050 D. Referenced Information REFERENCE DESIGNATION 07-11-00-581-001-A Lifting for Aircraft Maintenance Operations 07-11-00-586-002-A Lowering of the Aircraft for Maintenance Operations 24-41-00-862-002-A De-energize the Aircraft Electrical Circuits Supplied from the External Power 24-41-00-862-002-A-01 De-energize the Aircraft Electrical Circuits Supplied from the APU 24-41-00-862-002-A-02 De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) 29-00-00-864-001-A Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action

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# 57-26-13 PB401
Revision n ̊: 50REV. DATE : 01-Nov-2012

# @A318/A319/A320/A321 AIRCRAFT MAINTENANCE MANUAL REFERENCE DESIGNATION 29-23-00-860-001-A Disconnection of the Isolation Coup ling of the Power Transfer Unit (PTU) 29-23-00-860-002-A Connection of the Isolation Coupling of the Power Transfer Unit (PTU) 32-00-00-481-001-A Installation of the Safety Devices on the Landing Gears 32-00-00-481-002-A Installation of the Safety Devices on the Landing Gear Doors 32-31-46-000-001-A Removal of the MLG Actuating Cylinder 32-31-46-400-001-A Installation of the MLG Actuating Cylinder 57-26-13-000-004-A Removal of the Bearing Seals of the MLG Actuator Bearing Assembly 57-26-13-400-002-A Installation of the Bearing Assembly of the MLG Actuator Attachment (Ref. Fig. 57-26-13-991-00400-B - Bearing Seals - MLG Actuator Bearing Assembly) 3. Job Set-up Subtask 57-26-13-941-056-A A. Safety Precautions (1) Make sure that the safety barriers are in position. (2) Make sure that the safety devices are installed on the landing gears (Ref. TASK 32-00-00-481-001-A) and on the landing gear doors (Ref. TASK 32-00-00-481-002-A). (3) Make sure that the WARNING NOTICE(S) are in position in the cockpit to tel l persons not to operate the landing gear or the landing gear doors. Subtask 57-26-13-860-054-A B. Aircraft Maintenance Configuration (1) Make sure that the aircraft is on jacks (Ref. TASK 07-11-00-581-001-A). (2) Make sure that the ACCESS PLATFORM 3M (10 FT) is in position below the applicable main landing gear. (3) Make sure that the applicable hydraulic systems are de-pressurized (Ref. TASK 29-00-00-864-001-A). (4) Make sure that the isolation coupling of the PTU is disconnected (Ref. TASK 29-23-00-860-001-A). (5) Make sure that the applicable MLG actuating cylinder has been removed (Ref. TASK 32-31-46-000-001- A). (6) Make sure that the applicable MLG actuator attachment bearing assembly has been removed (Ref. TASK 57-26-13-000-004-A). Subtask 57-26-13-869-053-A C. Flight Configuration Precautions (1) If you did not open the LGCIU circuit breakers, make sure that the electrical circuits are de-energized (Ref. TASK 24-41-00-862-002-A) or (Ref. TASK 24-41-00-862-002-A-01) or (Ref. TASK 24-41-00-862-002-A-02). Subtask 57-26-13-865-051-A D. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged: PANEL DESIGNATION FIN LOCATION 49VU L/G/LGCIU/SYS1/NORM 1GA C09 121VU HYDRAULIC/LGCIU/SYS2 2GA Q35

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# 57-26-13 PB401
Revision n ̊: 50REV. DATE : 01-Nov-2012

# @A318/A319/A320/A321 AIRCRAFT MAINTENANCE MANUAL
PANEL DESIGNATION FIN LOCATION ** On A/C ALL EMB SB 32-1029 FOR A/C 620-622 624-629 631-633 637-637 121VU HYDRAULIC/LGCIU/SYS1/GRND SPLY 52GA Q34
4. Procedure
** On A/C ALL (Ref. Fig. 57-26-13-991-00400-B - Bearing Seals - MLG Actuator Bearing Assembly) Subtask 57-26-13-420-056-B A. Preparation for Installation (1) Clean the component interfaces and the adjacent areas with a LINT-FREE COTTON CLOTH (Material No: 19-003) made moist with CLEANING AGENTS (Material No: 11-026) . (2) Use a LINT-FREE COTTON CLOTH (Material No: 19-003) made moist with CLEANING AGENTS (Material No: 11-026) to clean the bearing ball (2) and the bearing-halves (1).
NOTE : Make sure that the grease channels are clean, and clear of unwanted material. (3) Do an inspection of the component interface and/or the adjacent area. (4) Make sure that the parts retained from the removed component are c lean and in the correct condition. (5) Apply a thin layer COMMON GREASES (Material No: 04-004) to the areas that follow: . the surface of the bearing ball (2) . the grease channels on the external surface of the bearing ball (2) . the grease channel on the internal surface of the bearing ball (2).
NOTE : Make sure that all the grease channels are filled with grease. Subtask 57-26-13-420-057-B B. Installation of the Bearing Seals (1) Install the new (IPC-CSN 57-26-13-01) dowel pins (5) in one of the bearing-halves (1). (2) Install the new (IPC-CSN 57-26-13-01) seal (3) in one of the bearing-halves (1). (3) Install the bearing-ball (2) in the applicable bearing-half (1).
NOTE : Make sure that the metal support ring of the seal (3) is against the bearing ball (2). (4) Install the other new (IPC-CSN 57-26-13-01) seal (4) in the applicable bearing-half (1).
NOTE : Make sure that the metal support ring of the seal (4) is against the bearing ball (2). (5) Install the bearing-halves (1) together as follows: (a) Make sure that the seals (3) and (4) are correctly located in the seal grooves of the bearing-halves (1). (b) Make sure that the dowel pins (5) locate correctly in the holes of the applicable bearing-half (1). (c) Make sure that the distance between the bearing-halves (1) is closed equally. (6) Before installation of the bearing assembly, install the special nut (6). Make sure that the special nut (6) can be freely turned along the thread of the bearing assembly. (7) Remove the special nut (6).

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# 57-26-13 PB401
Revision n ̊: 50REV. DATE : 01-Nov-2012

# @A318/A319/A320/A321 AIRCRAFT MAINTENANCE MANUAL 5. Close-up Subtask 57-26-13-410-052-A A. Close Access (1) Make sure that the work area is clean and clear of tool(s) and other items. (2) Install the MLG actuator attachment bearing assembly (Ref. TASK 57-26-13-400-002-A). (3) Install the MLG actuating cylinder (Ref. TASK 32-31-46-400-001-A). Subtask 57-26-13-860-056-A B. Aircraft Maintenance Configuration (1) Connect the isolation coupling of the PTU (Ref. TASK 29-23-00-860-002-A). Subtask 57-26-13-865-052-A C. Remove the safety clip(s) and the tag(s) a nd close this(these) circuit breaker(s):
PANEL DESIGNATION FIN LOCATION 49VU L/G/LGCIU/SYS1/NORM 1GA C09 121VU HYDRAULIC/LGCIU/SYS2 2GA Q35 ** On A/C ALL EMB SB 32-1029 FOR A/C 620-622 624-629 631-633 637-637 121VU HYDRAULIC/LGCIU/SYS1/GRND SPLY 52GA Q34 ** On A/C ALL Subtask 57-26-13-582-051-A D. Lower the Aircraft (1) Lower the aircraft off jacks (Ref. TASK 07-11-00-586-002-A). Subtask 57-26-13-942-052-A E. Removal of Equipment (1) Make sure that the work area is clean and clear of tool(s) and other items. (2) Remove the safety barriers. (3) Remove the warning notice(s). (4) Remove the access platform(s). (5) Remove the ground support and maintenance equi pment, the special and standard tools and all other items.

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# 57-26-13 PB401
Revision n ̊: 50REV. DATE : 01-Nov-2012