Installation of the Swivel plug-in unions and of O-Ring and Backup Washer on Swivel Plug-in Union

TASK 20-23-11-911-002-A
Installation of the Swivel plug-in unions and of O-Ring and Backup Washer on Swivel Plug-in Union

1. Reason for the Job
To correctly install swivel plug-in unions.
A number of Operators find much hydraulic leakage at these unions.
This is because of damage to the seals in these unions during incorrect installation.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
98A29103000000	1	ASSEMBLY TOOL-HYDRAULIC SEALS

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 12-12-29-611-002-A	Fill the Hydraulic Fluid Reservoir with a Hydraulic Service Cart
TASK 20-21-12-911-001-A	Tightening Torques for Pipe Unions (not for OXYGEN Unions)
TASK 20-23-11-911-001-A	Installation of the Hydraulic Tubes
TASK 29-00-00-870-001-A	Bleeding Procedure of the Green Hydraulic System Upstream of the Engine Pump
TASK 29-00-00-870-002-A	Bleeding Procedure of the Green Hydraulic System Upstream of the PTU
TASK 29-00-00-870-003-A	Bleeding Procedure of the Green Hydraulic System Downstream of the Engine Pump
TASK 29-00-00-870-004-A	Bleeding Procedure of the Yellow Hydraulic System Upstream of the Engine Pump
TASK 29-00-00-870-005-A	Bleeding Procedure of the Yellow Hydraulic System Upstream of the PTU
TASK 29-00-00-870-006-A	Bleeding Procedure of the Yellow Hydraulic System Upstream of the Yellow E-Pump
TASK 29-00-00-870-007-A	Bleeding Procedure of the Yellow Hydraulic System Downstream of the Engine Pump
TASK 29-00-00-870-008-A	Bleeding Procedure of the Blue Hydraulic System Upstream of the Blue E-Pump
TASK 29-00-00-870-009-A	Bleeding Procedure of the Blue Hydraulic System Downstream of the Blue E-Pump
TASK 29-10-00-863-001-A	Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-002-A	Pressurize the Yellow Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-003-A	Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-003-A-01	Pressurize the Blue Hydraulic System with the Blue Electric Pump
TASK 29-14-00-614-002-A	Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01	Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
TASK 29-23-00-863-001-A	Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
TASK 29-23-00-863-002-A	Pressurize the Yellow Hydraulic System from the Green Hydraulic System through the PTU with the Ground Service Cart
TASK 32-42-00-870-001-A	Bleeding of the Normal Braking at the Brake Units
TASK 32-43-00-612-001-A	Filling and Bleeding of the Low Pressure Control System of the Alternate Braking
TASK 32-43-00-612-001-A-01	Filling and Bleeding of the Low Pressure Control System of the Alternate Braking using Green Reservoir fluid
TASK 32-43-00-870-002-A	Bleeding of the High Pressure Alternate Braking System
Installation of a Swivel Plug-in Union and of an O-Ring and a Backup Washer on a Swivel Plug-in Union

3. Job Set-up
Subtask 20-23-11-911-054-A

A. Equipment 98A29103000000 ASSEMBLY TOOL-HYDRAULIC SEALS.

4. Procedure
Subtask 20-23-11-911-055-A

A. Removal of the O-Ring and Backup Washer

CAUTION: DO NOT USE POINTED, SHARP OR METAL TOOLS TO REMOVE THE O-RING AND BACK UP WASHER. SHARP EDGES CAN CAUSE DAMAGE TO THE GROOVES OR CONTACT SURFACES OF THE UNION.

(1) Use a spoon-type removal tool or a wedge-type removal tool with a hook to remove the O-ring and the backup washer.
(2) Discard the O-ring and the backup washer.

Subtask 20-23-11-911-056-A

B. Installation of the Backup Washer and of the O-Ring

CAUTION: DO NOT INSTALL THE REMOVED O-RING OR BACK UP WASHER AGAIN. YOU MUST ALWAYS INSTALL A NEW O-RING OR BACK UP WASHER BEFORE YOU INSTALL A REMOVED UNION. A COMPRESSED SEAL WILL NOT GO BACK TO ITS INITIAL CONDITION.

(1) Safety precautions
(a) Before you start the installation, make sure that you have the correct P/Ns.

O-ring : NAS1612-XX or NAS1602-XX
locknut : AN6289-XX
backup washer : MS28777-XX (leather) or MS28773-XX (teflon).

NOTE: We recommend the installation of the teflon backup washer (MS28773-XX).

(b) Make sure that the parts you install are clean and not damaged.
(c) Before you install the seals, make sure that the union is not damaged:

discard the union if it has scratches or if the groove of the 0-ring is damaged.

(2) Installation of the backup washer
(a) Lightly lubricate the threads of the locknut with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) or Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .
(b) Turn the locknut until it is on the second row of threads with the recess on the nose side of the union.
(c) Align the bottom of the recess with the start of the threads.
(d) Get the installation tool applicable to the diameter of the union and install it on the union.
(e) Move the backup washer on the sleeve until the inner diameter touches the conical end of the sleeve.

NOTE: If you use a leather backup washer, the rough face must be on the locknut recess side and the smooth face on the O-ring side.

(f) Move the pusher on the sleeve until it touches the backup washer.
(g) Gradually push the pusher until the backup washer goes into the recess of the locknut.
(h) Remove the installation tool.
(i) Get the knurled ring applicable to the diameter of the union.
(j) Adjust and push the backup washer into the bottom of the locknut recess (hold the locknut so that it does not turn).
(k) remove the knurled ring.
(l) Make sure that the backup washer is correctly installed in the nut recess.
(3) Installation of the O-ring
(a) Lubrication of the O-ring

CAUTION: ONLY USE HYDRAULIC FLUID MATERIAL NO. 02-003 OR MATERIAL NO. 02-008 TO LUBRICATE THE O-RING AND THE THREAD (O-RING SIDE) ON PLUG-IN FITTINGS. OTHER LUBRICANTS CAN CAUSE DAMAGE TO THE O-RING.

1 Immerse the O-ring in Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) or Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) for a minimum of a quarter of an hour.
2 Lightly apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) or Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the conical end of the sleeve.
(b) Move the O-ring on the sleeve until its inner diameter touches the conical end of the sleeve.
(c) Move the pusher on the sleeve until it touches the O-ring.
(d) Gradually push the pusher until the O-ring goes into the groove of the union.
(e) Remove the installation tool.
(f) Make sure that the O-ring is in the correct position without any torsion or damage.

Subtask 20-23-11-911-057-A

C. Installation of the Union
(1) Lightly apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) or Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) on the first row of threads of the union.
(2) Turn the union and the locknut at the sametime until the backup washer comes into contact with the equipment.

NOTE: The union must turn freely in the equipment or manifold port.

(3) Turn the union and the locknut at the same time a maximum of one turn to align the union with the pipe.
(4) Connect and tighten the related pipe (Ref. AMM TASK 20-23-11-911-001).
(5) Hold the union with an open-ended spanner (Ref. AMM TASK 20-21-12-911-001) and TORQUE the locknut to the applicable value.

5. Close-up
Subtask 20-23-11-860-061-A

A. Put the Aircraft back to its Initial Configuration
(1) Pressurize the hydraulic reservoirs (Ref. AMM TASK 29-14-00-614-002).
(2) If necessary, fill the hydraulic reservoirs:

With a hand pump (Ref. AMM TASK 12-12-29-611-001) or
With a hydraulic cart (Ref. AMM TASK 12-12-29-611-002).

(3) Pressurize the hydraulic systems:

For the Green system (Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001)
For the Yellow system (Ref. AMM TASK 29-10-00-863-002) or (Ref. AMM TASK 29-23-00-863-002)
For the Blue system (Ref. AMM TASK 29-10-00-863-003).

(4) Make sure that there is no leakage in the repaired area.
(5) Bleed the related hydraulic system:
(a) For the Green system:

Upstream of the engine pump (Ref. AMM TASK 29-00-00-870-001)
Upstream of the PTU (Ref. AMM TASK 29-00-00-870-002)
Downstream of the engine pump (Ref. AMM TASK 29-00-00-870-003).

(b) For the Yellow system:

Upstream of the engine pump (Ref. AMM TASK 29-00-00-870-004)
Upstream of the PTU (Ref. AMM TASK 29-00-00-870-005)
Upstream of the Yellow E-pump (Ref. AMM TASK 29-00-00-870-006)
Downstream of the engine pump (Ref. AMM TASK 29-00-00-870-007).

Upstream of the Blue E-pump (Ref. AMM TASK 29-00-00-870-008)
Downstream of the Blue E-pump (Ref. AMM TASK 29-00-00-870-009).

(d) For the normal braking system (Ref. AMM TASK 32-42-00-870-001).
(e) For the alternate braking system:

Low pressure (if installed) (Ref. AMM TASK 32-43-00-612-001)
High pressure (Ref. AMM TASK 32-43-00-870-002).

(6) Make sure that the work area is clean and clear of tools and other items.

[Rev.10 from 2021] 2026.03.31 22:59:24 UTC