Nexen LSCB-32 923522 - Manual (Page 9)

FORM NO. L-21143-J-0413 9
8. Flip unit over (Hub facing down) and rest the edges
of the Air Chamber (Item 3) on the I-beam and press
Hub-Piston assembly from the Air Chamber. (Figure
3c)
LSCB-54HT only: Remove the Retaining Ring (Item 25)
that secures the conical Friction Facing (Item 20) inside
the piston. The worn facing can then be removed. (See
Figure 9)
LSCB-44HT only: While supporting the piston assembly,
drive the splines of the hub through the conical friction
facing (this will destroy the facing).
LSCB-32HT only: Remove Bearing (Item 10) from Thrust
Plate (Item 26). Remove pan head screws (Item 8) from
the piston assembly. Discard the damaged Bearing
(Item 10). (See Figure 9)
9. Remove and discard the worn conical Friction Facing
(Item 20).
REASSEMBLY (Refer to Figure 9.)
10. Using a degreaser, clean all metal components of
the unit, removing all facing dust and grease before
reassembly.
11. Apply NEVER-SEEZ® to the splines of the Hub (Item
1).
LSCB-32HT only: Insert two piece facing (Item 20) into the
piston (Item 11). Attach the Thrust Plate (Item 20) to
the Piston (Item 11) using four pan head screws (Item
8). Torque the screws to 4.2 - 5.4 Nm [37 - 48
In-lbs]. Press the new bearing (Item 10) into the Thrust
Plate (Item 26). [Note: Skip step 15 for LSCB-32HT]
12. Reassemble the unit: Start on the air chamber side by
pressing the Hub (Item 1) into the air chamber Bearing
(Item 6).
13. Next insert the piston-bearing assembly into the air
chamber cavity. Use care to ensure proper alignment
with the pins or shoulder bolt holes.
14. Insert the conical Friction Facing (Item 20) into the
Piston (Item 11) by using small retaining pliers. Carefully
position the facing and move the Piston (if necessary)
to ensure positive engagement.
NOTE: Once in position, it may be helpful to spread
the conical Friction Facing (Item 20) open by using
retaining ring pliers.
LSCB-54HT only: Insert Retaining Ring (Item 25) to secure
conical Friction Facing (Item 20).
15. Reassemble the pilot by replacing (in order) the Friction
Facings (Item 4), Friction Plates (Item 5), and Springs
(Item 17) on the Drive Pins (Item 15).
16. Position the Air Chamber/Hub combination down on
the Arbor Press.
17. While keeping pressure on the Facings, Springs, and
Facing Plates, and aligning the Facing Plates to the
spline on the way down, carefully position and press
the Pilot-Facing assembly onto the Hub.
Skip steps 17 & 18 if using LSCB-44.
18. Clean and reapply lubricant to the Shoulder Bolt
O-Rings (Item 23) and install on the Shoulder Bolts.
19. After aligning the Piston (Item 11) to the Air Chamber
(Item 3), insert and reinstall Shoulder Bolts (Item 21)
by torquing them to the specifications shown in Table
4.
20. Insert the Retaining Ring (Item 14) onto the Hub (Item
1).
21. Verify that the unit is functional by applying air to the
unit and watching it engage and disengage.
Figure 3c
MAINTENANCE (continued)
CAUTION
Working with spring loaded or tension
loaded fasteners and devices can cause
injury. Wear safety glasses and take the
appropriate safety precautions.
Shoulder Bolt Tightening Torque
Model Torque
LSCB-32 43 in-lb [4.8 Nm]
LCSB-44 205 in-lb [23.1 Nm]
LSCB-54 205 in-lb [23.1 Nm]
Table 4