Nexen SBP09 965110 - Manual (Page 12)

FORM NO. L-21059-E-0813 12
TROUBLESHOOTING
Problem Probable Cause Solution
Failure to engage (brake). Weak or broken springs. Replace broken springs.
Failure to disengage (1).
Control valve malfunction - air not getting
to the brake.
Check for low air pressure or
replace the control valve.
NOTE: Unit has been designed to
release before (at or below) 5.5 bar
[80 psi]. Required disengagement
pressure higher than 5.5 bar
[80 psi] may indicate improper
assembly.
Failure to disengage (2). Air is leaking around the O-ring seals. Replace the O-rings.
Loss of torque. Friction Facing is worn or dirty. Replace the Friction Facing.
FRICTION FACING ASSEMBLY
NOTE: Refer to Figures 9 & 10.
1. Alternately and evenly, remove the eight Socket Head
Cap Screws (Item 11) and separate the Air Chamber
(Item 6) from the Input Flange (Item 10).
2. Remove the Input Flange (Item 10), Backing Plate (Item
15) and eight Springs (Item 9).
3. Remove and replace the Friction Facing (Item 8) in the
Air Chamber (Item 6). Make certain that the angled
sides mate with the wall of the Air Chamber and the
tapered disc of the Output Shaft (Item 1).
4. Replace the 10 Springs (Item 9) and Input Flange
(Item 10).
5. Apply a drop of Loctite® 242 (blue) to the threads
of each of the eight Socket Head Cap Screws (Item
11).
6. Reinstall and tighten the eight Socket Head Cap
Screws (Item 11), securing the Air Chamber (Item 6)
to the Input Flange (Item 10). Alternately tighten the
eight Cap Screws so the Input Flange stays parallel
to the Air chamber (Item 6) and does not pinch any of
the Springs (Item 9). Refer to Table 5 (page 11) for the
recommended assembly torque.
FIGURE 9
FIGURE 10
Item 14
Item 9
Item 10
Item 11
Item 7
Item 15
Item 8
Item 1
Item 2 Item 3
Item 4
Item 5
Item 6
Item 23
CAUTION
Working with spring or tension loaded
fasteners and devices can cause injury.
Wear safety glasses and take the
appropriate safety precautions.