(c)
 Put the compression bushing (1) of the tool into the bobbin that you remove.

 (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.

 Identification of Bobbins and Tools
 Figure 201/TASK 20-23-21-991-001
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 Removal of Bobbins from Housings
 Figure 202/TASK 20-23-21-991-002
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 Subtask 20-23-21-911-052
 C. Removal of the O-ring, Square Seal and the Back-up Rings 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. Subtask 20-23-21-911-053
 D. Installation of the O-ring, the Square Seal and the Back-up Rings (Ref. Fig. 203/TASK 20-23-21-991-003)
 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.
 NOTE : Operators could cut back-up rings to make their installation on
____ bobbin easier. But back-up rings incorrectly cut can cause leaks. To prevent this, back-up rings are now delivered 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 ring.
 (1) Safety precautions
 (a) Before the installation, make sure that the references of the parts you install on the bobbin are correct (Ref. Fig. 203/TASK 20-23-21-991-003)
 1_ Manifold side (bobbin identification groove side)
 - O-ring: NAS1611-XX or NAS1601-XX
 - back-up ring: NSA8671-XX
 2_ Equipment side:
 - square seal: NSA8213-XX
 - back-up ring: NSA8674-XX

 Installation of the O-Rings (or the Square Seals or the Back-up Rings)
 Figure 203/TASK 20-23-21-991-003

 (b)
 Make sure that the parts you install are not damaged.

 (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).

 (d)
 Before you install the seals, make sure that the bobbin is not damaged:

 -discard the bobbin when it has scratches or when the grooves of the seals are damaged.
 (2) Installation on bobbins (Ref. Fig. 203/TASK 20-23-21-991-003)
 (a)
 Get the seal installation tool applicable to the diameter of the bobbin

 (b)
 Install the bobbin on the tool

 1 Tool for bobbin from 1/4" dia to 1/2" dia:
_ -slide the bobbin onto the sleeve (1).
 2 Tool for bobbin from 5/8" dia to 1" dia:
_ -slide the bobbin onto the compression bushing of the tool,
 -tighten the nut (3) until the bobbin is locked on the tool.
 (c) Lubrication
 CAUTION : ONLY USE LUBRICANT MATERIAL N.. 04-015 OR HYDRAULIC
_______ FLUID MATERIAL N.. 02-003 TO LUBRICATE THE SEALS.
 NOTE : If you lubricate the seal with HYDRAULIC FLUIDS (Material
____ No. 02-003) it is necessary to immerse the seal into hydraulic fluid for a minimum of a quarter of an hour before you install it on the bobbin.
 1 Lightly apply COMMON GREASE (Material No. 04-015) on the
　
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