SFN-20240124B Revisions of boom pivot pin

TICO Document #: SFN-20240124B (formerly TES 123)

Description of Procedure: Bolt in boom pivot pin loosens or breaks. Boom bushings and pivot pin design revised. Added grease grooves to boom bushing and revised boom restraint to a single nylon insert nut. Boom pin is held from rotation by retaining bars at the head of the pin.

Units Affected: All tractors made in 2013 and older

Parts Required: Pivot pin, boom 20288 (QTY 1)

• Lock bars 20287 (QTY 2)

• Washer, 1 ½” 85099 (QTY 1)

• Nut, 1 ½”-12-2B-UNF NTU Nylon insert 85169 (QTY 1)

• Bushing-grooved 30228 (QTY 4)

• Shelf, 3rd battery support (If applicable 3rd Battery systems) 20280 (QTY 1)

Planned Labor: 1 hour

Instructions:

1. Park vehicle on flat surface, apply parking brake, and chock wheels. If your company utilizes a “Lock Out, Tag Out” policy, you should employ it during this procedure.

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2. Remove battery box cover and disconnect ground and positive cables from battery terminals on each of the batteries. Remove the 3rd battery from box if applicable.

3. Battery box slot directly in front of boom pivot pin may require widening to clear 1 ½” nut socket. Generally this width needs to be 3 1/8” min. to clear socket. Check clearance with your socket to determine if battery box requires modification.

4. Remove welds around pivot pin’s washer and bolt head on both sides, taking care to preserve the frame boss face surface. Newer frame will have a replaceable bushing installed in the frame boss.

   Note: Check condition of frame bushings before installing new pin.

5. Remove washers/bolts and discard.

6. You will need to support forward section of boom during removal of pivot pin. You may need to remove the boom platform in order to properly support the boom during this procedure. Use appropriate lifting device.

   • Note the number and position of the boom shims (both sides) between the boom boss and the frame. These will be reused in the same position later.

7. With the boom supported.

8. Remove boom pin from frame.

9. Elevate front of boom and remove the bushings from the boom boss on both sides.

10. Inspect the bushings in the frame boss. They should be tight and flush with the face of the boss.

11. Replace old bushings with new grooved bushings, P/N 30228 ( 2 required per side). Insert a bushing from both sides until flush with face of boom boss. There will be a space between the bushing after they are installed. This space forms a grease reservoir. These bushing are an interference fit with the boss. They must be press-fit into the boss.

12. Lower boom into place and insert new pivot shaft with lock plate assembly, P/N 20288. Insertion of the shaft begins on the left-hand side of frame, (fuel tank side). Install shims as applicable.

13. Orient locking plate as shown.

14. Clamp locking bars flush to lock plate and flush to boom boss. Weld along outside edge of lock bars and boom boss. (Do not weld pivot shaft lock plate)

    

15. Secure right hand side of pivot shaft with 1 1/2” washer, P/N 85099, and 1 ½-12 UNF NTU locknut, P/N 85169.

16. Tighten nut until washer bottom against pin shoulder. At this point the nut will stop advancing. The outside of the frame will measure approximately 42 ½”.

17. Reinstall/Reconnect batteries. If third battery option is utilized on QSB trucks, Remove third battery shelf and replace it with new flanged shelf, P/N 20280.

18. ISB engine only will require modify the battery box cover to accommodate top of pivot shaft’s nut. Refer to battery box cover drawings for diagram of modification.

19. Reinstall battery box cover and lubricate all grease fittings.

20. Start vehicle and test boom to ensure proper function. Raise and lower boom checking for operation and clearance.

21. Remove “Lock Out, Tag Out” plaque.

22. Return vehicle to service.

23. Discard old pivot pin, washers, bolts, and old third battery top shelf (if applicable).

Note: No modification necessary for 116” wheelbase ISB battery boxes or 128” wheelbase QSB battery boxes.