Nexen 1625 Input Unit 936001 - Manual (Page 11)

11 21070-D-0707
FMCB 1625
1. Remove the four Socket Head Cap Screws (Item 15)
that secure the Air Chamber (Item 14) to the Housing
(Item 7) (See Figure 11).
2. Remove the four Socket Head Cap Screws (Item 15)
that secure the Male Pilot (Item 27) to the Air Chamber
(Item 14) (See Figure 11).
3. Remove the Male Pilot (Item 27) and Stub Shaft
(Item 31) from the Air Chamber (See Figure 11).
4. Remove the Retaining Ring (Item 6) from the Splined
Disc (Item 9) (See Figure 12).
5. Press the Splined Disc (Item 9) out of the Bearing (Item
2) and Piston (Item 17) (See Figure 12).
6. Remove the Piston (Item 17) from the Air Chamber
(Item 14) (See Figure 12).
7. Remove the old O-ring Seals (Items 16, 21 & 23) from
the Piston and Air Chamber (See Figure 12).
8. Remove the Retaining Ring (Item 3) from the Piston
(Item 17) (See Figure 12).
9. Press the Bearing (Item 2) out of the Piston (Item 17)
(See Figure 12).
10. Clean the bearing bore of the Piston with fresh safety
solvent, making sure all old Loctite ® residue is removed.
11. Apply an adequate amount of Loctite ® 680 to evenly
coat the outer race of the new Bearing (Item 2).
12. Carefully align the outer race of the new Bearing
(Item 2) with the bore of the Piston (Item 17).
13. Supporting the Piston (Item 17) and pressing on the
outer race of the new Bearing, press the new Bearing
into the Piston (See Figure 12).
14. Reinstall the Retaining Ring (Item 3), securing the
Bearing to the Piston.
15. Coat the o-ring contact surfaces of the Air Chamber
(Item 14), Piston (Item 17), Male Pilot (Item 27) and the
new O-ring Seals (Items 16, 21, 23, and 24) with a thin
film of o-ring lubricant and install the new O-ring Seals
(See Figure 11 and 12).
16. Slide the Piston (Item 17) into the Air Chamber (Item
14).
17. Support the inner race of the Bearing (Item 2) and
press the Splined Disc (Item 9) into the Bearing and
FIGURE 11
FIGURE 12
REPLACEMENT PROCEDURE–PISTON BEARING AND O-RING SEALS
Always wear safety goggles when working
with spring or tension loaded fasteners
or devices, such as the retaining rings.
WARNING
Piston (Item 17).
18. Reinstall the Retaining Ring (Item 6) that secures the
Splined Disc to the Bearing (Item 2).
19. Align the Spring Pin (Item 25) in the Male Pilot
(Item 27) with the hole in the Piston (Item 17); then,
slide the Male Pilot into the Piston (See Figure 11 and
12).
20. Apply a drop of Loctite ® 242 to the threads of the
Socket Head Cap Screws (Item 8) (See Figure 12).
21. Reinstall and tighten the four Socket Head Cap Screws
securing the Male Pilot (Item 27) to the Air Chamber
(Item 14) to 509 in-lbs (57.5 N-m).
22. Apply a drop of Loctite ® 242 to the threads of the
Socket Head Cap Screws (Item 8 ) (See Figure 11).
23. Reinstall and tighten the four Socket Head Cap Screws
1
2
2
1
2
1

31
1
21
1
2
3
9
1
23
2