DOC AIRBUS | AMM A320FRemoval/Installation of the Bobbins from their Housings and Installation of O-rings, Square Seals, and Back-up Rings on the Bobbins
TASK 20-23-21-911-001-A
Removal/Installation of the Bobbins from their Housings and Installation of O-rings, Square Seals, and Back-up Rings on the Bobbins
1. Reason for the Job
Self Explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Referenced Information
3. Job Set-up
Subtask 20-23-21-869-050-A
Subtask 20-23-21-911-050-A Subtask 20-23-21-911-051-A
(a) Before the installation, make sure that the references of the parts you install on the bobbin are correct:
1 Manifold side (bobbin identification groove-side):
(c) Make sure that you install the parts in the correct position and in this sequence:
(a) Get the seal installation tool applicable to the diameter of the bobbin.
(b) Install the bobbin on the tool:
1 Tool for the bobbin from 1/4" dia to 1/2" dia:
2 Lightly apply Grease-Hydraulic Systems - - (Material No.03LDA1) or 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 (1).
(d) Move the O-ring (or the square seal or the back-up ring) onto the sleeve (1) until it touches the conical end of the sleeve.
(e) Move the pusher (2) onto the sleeve (1) until it touches the O-ring (or the square seal or the back-up ring).
(f) Push the pusher until the O-ring (or the square seal or the back-up ring) is in the correct position in the groove of the bobbin.
(g) Make sure that the O-ring (or the square seal or the back-up ring) is in the correct position without torsion or damage.
(h) Remove the tool.
Subtask 20-23-21-911-054-A
[Rev.10 from 2021]
2026.03.31 22:59:41 UTC
Removal/Installation of the Bobbins from their Housings and Installation of O-rings, Square Seals, and Back-up Rings on the Bobbins
1. Reason for the Job
Self Explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| 97A29102090000 | 1 | TOOL SET-REMOVAL BOBBINS AND INSTALLATION RINGS |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.02ABA1) | Phosphate Ester Hydraulic Fluid-General Power - - |
| (Material No.03LDA1) | Grease-Hydraulic Systems - - |
| REFERENCE | DESIGNATION |
|---|---|
Identification of Bobbins and ToolsSubtask 20-23-21-869-050-A
A. Not Applicable
4. ProcedureSubtask 20-23-21-911-050-A Subtask 20-23-21-911-051-A
B. Removal of Bobbins from their Housings
(1) Removal of bobbins (from 1/4" dia to 1/2" dia)
(a) Get the removal tool applicable to the diameter of the bobbin that you remove.
(b) Make sure that the tool is correctly set:
(d) Hold the nut (3) of the tool and turn the body (2) until the bobbin is locked on the tool.
(e) Pull the tool to remove the bobbin from its housing.
(2) Removal of bobbins (from 5/8" dia to 1" dia)
(a) Get the removal tool applicable to the diameter of the bobbin that you remove.
(b) Put the compression bushing (1) of the tool into the bobbin that you remove.
(c) Hold the body (2) of the tool and turn the nut (3) until the bobbin is locked on the tool.
(d) Pull the tool to remove the bobbin from its housing.
Subtask 20-23-21-911-052-A (1) Removal of bobbins (from 1/4" dia to 1/2" dia)
(a) Get the removal tool applicable to the diameter of the bobbin that you remove.
(b) Make sure that the tool is correctly set:
- 34 mm (1.3386 in.) for bobbin from 1/4" dia to 3/8" dia,
- 40 mm (1.5748 in.) for bobbin of 1/2" dia.
(d) Hold the nut (3) of the tool and turn the body (2) until the bobbin is locked on the tool.
(e) Pull the tool to remove the bobbin from its housing.
(2) Removal of bobbins (from 5/8" dia to 1" dia)
(a) Get the removal tool applicable to the diameter of the bobbin that you remove.
(b) Put the compression bushing (1) of the tool into the bobbin that you remove.
(c) Hold the body (2) of the tool and turn the nut (3) until the bobbin is locked on the tool.
(d) Pull the tool to remove the bobbin from its housing.
C. Removal of the O-ring, Square Seal and the Back-up Rings
(2) Discard the O-ring, the square seal and the back-up rings.
Subtask 20-23-21-911-053-A CAUTION:
DO NOT USE POINTED, SHARP OR METAL TOOLS TO REMOVE THE O-RING OR SQUARE SEAL OR BACK-UP RINGS. SHARP EDGES CAN CAUSE DAMAGE TO THE BOBBINS (GROOVES OR SEAL CONTACT SURFACES).
(1) Use spoon-type removal tools or a wedge-type removal tool with a hook to remove the O-ring, the square seal and the back-up rings. (2) Discard the O-ring, the square seal and the back-up rings.
CAUTION:
DO NOT INSTALL REMOVED O-RINGS, SQUARE SEALS AND BACK-UP RINGS AGAIN. YOU MUST ALWAYS REPLACE THE O-RING, SQUARE SEAL AND THE BACK-UP RINGS ON A REMOVED BOBBIN BEFORE YOU INSTALL IT AGAIN. A COMPRESSED SEAL WILL NOT GO BACK TO ITS INITIAL CONDITION.
D. Installation of the O-ring, the Square Seal and the Back-up Rings NOTE: Operators can cut the back-up rings to make their installation on the bobbin easier. If the back-up rings are cut incorrectly, it can cause leaks. To prevent this, the back-up rings are now delivered after the cut and we strongly recommend their use.
NOTE: The installation procedure is the same for the O-ring, the square seal and the back-up rings.
(1) Safety precautions (a) Before the installation, make sure that the references of the parts you install on the bobbin are correct:
1 Manifold side (bobbin identification groove-side):
- O-ring: NAS1611-XX or NAS1601-XX
- Back-up ring: NSA8671-XX.
- Square seal: NSA8213-XX
- Back-up ring: NSA8674-XX.
(c) Make sure that you install the parts in the correct position and in this sequence:
- Install the back-up rings in the grooves before you install the seals.
- Install the O-ring on the identification groove side of the bobbin (manifold side).
- Discard the bobbin when it has scratches or when the grooves of the seals are damaged.
(a) Get the seal installation tool applicable to the diameter of the bobbin.
(b) Install the bobbin on the tool:
1 Tool for the bobbin from 1/4" dia to 1/2" dia:
- Move the bobbin onto the sleeve (1).
- Move the bobbin onto the compression bushing of the tool.
- Tighten the nut (3) until the bobbin is locked on the tool.
CAUTION:
ONLY USE LUBRICANT MATERIAL N°. 04-015 OR HYDRAULIC FLUID MATERIAL N°. 02-003 OR MATERIAL NO. 02-008 TO LUBRICATE THE SEALS.
(c) Lubrication NOTE: If you lubricate the seal with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) or Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) , it is necessary to immerse the seal into the hydraulic fluid for a minimum of a quarter of an hour before you install it on the bobbin.
1 Lightly apply Grease-Hydraulic Systems - - (Material No.03LDA1) on the O-ring (or the square seal) or immerse the O-ring (or the square seal) into 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 Grease-Hydraulic Systems - - (Material No.03LDA1) or 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 (1).
(d) Move the O-ring (or the square seal or the back-up ring) onto the sleeve (1) until it touches the conical end of the sleeve.
(e) Move the pusher (2) onto the sleeve (1) until it touches the O-ring (or the square seal or the back-up ring).
(f) Push the pusher until the O-ring (or the square seal or the back-up ring) is in the correct position in the groove of the bobbin.
(g) Make sure that the O-ring (or the square seal or the back-up ring) is in the correct position without torsion or damage.
(h) Remove the tool.
E. Installation of the Bobbins in their Housings
(1) Installation of bobbins (from 1/4" dia to 1/2" dia)
(a) Make sure that bobbin is clean.
(b) Get the installation tool applicable to the diameter of the bobbin that you install.
(c) Make sure that the tool is correctly set:
(e) Hold the nut (3) of the tool and turn the body (2) until the bobbin is locked on the tool.
(f) Lightly apply Grease-Hydraulic Systems - - (Material No.03LDA1) or Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) or Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the seals of the bobbin.
(g) Align the bobbin with its housing and push on the tool to move the bobbin into its housing.
(i) Make sure that the bobbin is correctly installed.
(2) Installation of bobbins (from 5/8" dia to 1" dia)
(a) Make sure that the bobbin is clean.
(b) Get the installation tool applicable to the diameter of the bobbin that you install.
(c) Put the compression bushing (1) of the tool into the bobbin that you install.
(d) Hold tha body (2) of the tool and turn the nut (3) until the bobbin is locked on the tool.
(e) Lightly apply Grease-Hydraulic Systems - - (Material No.03LDA1) or Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) or Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the seals of the bobbin.
(f) Align the bobbin with its housing and push on the tool to move the bobbin into its housing.
(h) Make sure that the bobbin is correctly installed.
(1) Installation of bobbins (from 1/4" dia to 1/2" dia)
(a) Make sure that bobbin is clean.
(b) Get the installation tool applicable to the diameter of the bobbin that you install.
(c) Make sure that the tool is correctly set:
- 34 mm (1.3386 in.) for bobbin from 1/4" dia to 3/8" dia,
- 40 mm (1.5748 in.) for bobbin of 1/2" dia.
(e) Hold the nut (3) of the tool and turn the body (2) until the bobbin is locked on the tool.
(f) Lightly apply Grease-Hydraulic Systems - - (Material No.03LDA1) or Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) or Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the seals of the bobbin.
(g) Align the bobbin with its housing and push on the tool to move the bobbin into its housing.
NOTE: Make sure that the groove side of the bobbin is installed into the manifold.
(h) Remove the tool. (i) Make sure that the bobbin is correctly installed.
(2) Installation of bobbins (from 5/8" dia to 1" dia)
(a) Make sure that the bobbin is clean.
(b) Get the installation tool applicable to the diameter of the bobbin that you install.
(c) Put the compression bushing (1) of the tool into the bobbin that you install.
(d) Hold tha body (2) of the tool and turn the nut (3) until the bobbin is locked on the tool.
(e) Lightly apply Grease-Hydraulic Systems - - (Material No.03LDA1) or Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) or Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the seals of the bobbin.
(f) Align the bobbin with its housing and push on the tool to move the bobbin into its housing.
NOTE: Make sure that the groove side of the bobbin is installed into the manifold.
(g) Remove the tool. (h) Make sure that the bobbin is correctly installed.