Usage:
446B (5BL) Backhoe Loader
- SUPPLEMENT: JUNE 8, 1998
Service Magazine SEPD0322, Article 5, Page 5; September 16, 1996; "Rotated Extension Stick Cylinder Protects Cylinder Port".
Disregard this article and see Service Magazine SEPD0420, Article 6, Page 5 with the same title.
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Description of Change: The 446B Backhoe Loader has a new extension stick cylinder. This new cylinder is shorter than the former cylinder and has been rotated 180 degrees. This change increases the protection of the inlet - outlet port on the piston end of the cylinder and eliminates bolt head interference.
The following groups are affected: * 9R-1358 - Lines Group - Extension Stick * 9R-2583 - Lines Group - Extension Cylinder
Adaptable To: The improvement is effective with 446B (5BL917) Backhoe Loaders. Earlier machines can be retrofitted using the new parts shown in the following charts A, B, and C.
Conversion Procedure
Illustration 1. Former stick cylinder group.
1. Remove the extension stick and extension stick cylinder.
2. Remove bolts (6) and washers (7). (IIllustration 1)
3. Remove clip (3), clip (4), clip (5), plate (8), and tube assy. (2). (Illustration 1)
4. Remove former 9R-9518 Tube Assembly and replace with new 120-9747 Tube Assembly (1). (Illustration 1)
5. Install the extension stick and extension stick cylinder (9) with cylinder rotated 180 degrees from removal position.
Illustration 2. Fabricated boss (14).
6. Fabricate boss (14) from carbon steel as per Illustration 2 and Chart C.
Illustration 3. Dimension A is 218 ± 2 mm (8.6 ± .1 in). Dimension B is 389 ± 2 mm (15.3 ± .1 in). Fabricated boss (14).
7. Weld two fabricated bosses (14) on 9R-9584 Housing Assembly. (Illustration 3)
Illustration 4. Former Extension Stick
Illustration 5. New Extension Stick
8. Remove two former 9R-5370 hose assemblies and replace with two new 122-9967 Hose Assemblies (10). (Illustration 4 and 5)
9. Attach top end of each hose assy. (10) to boss (14) with one clip (11), clip (4), bolt (6), and washer (7). (Illustration 5.)
10. Attach tube assy. (12), (120-8411), to right hand hose assy (10) and tube assy (1). Attach tube assy (13), (120-8410), to left hand hose assy (10) and piston end cylinder port. (Illustration 4 and 5.)