6-48 P/N 9-500-0255
Service Manual
Chapter 6: Maintenance—Remove and Replace Procedures
C-Arm Components—Remove and Replace
3.3.3 Compression Clutch & Clutch Brake Assembly
The Compression Clutch & Clutch Brake assembly is made up of a clutch
mechanism, a brake, a handwheel assembly, and a series of gears and sprockets.
Access to this assembly requires removal of the top & bottom compression device
covers.
1. Turn power OFF. Remove the top and bottom compression device covers as per
Section 3.3.1. Use care not to damage the compression device bellows.
2. Loosen the set screws that secure the right side compression knob (Figure 6-33,
Item 5) to the clutch shaft (Figure 6-33, Item 1). Slide the knob off the shaft.
3. Loosen the screws that secure the locking bar (Figure 6-33, Item 6) to the clutch
shaft. Slide the clutch shaft out of the compression device from the left side.
4. Remove the slip clutch (Figure 6-33, Item 4) from the compression device. If it is
only necessary to replace the clutch, skip steps 5 and 6.
5. Remove the screws that secure the clutch brake magnet assembly (Figure 6-33,
Item 2) to the left side compression device frame. Remove the clutch brake
magnet assembly and the brass spacer (Figure 6-33, Item 3) from the
compression device.
6. Remove the clutch brake harness connector from the main harness.
7. Install the replacement clutch brake and tighten the mounting screws. Connect
the clutch brake harness to the main wiring harness.
8. Slide the clutch shaft into the compression device from the left side until the
shaft end protrudes through the opening in the clutch brake. Slide the brass
spacer (raised edge first) over the shaft and into the brake.
9. Place the armature on the end of the replacement clutch (machined side toward
the brake). Slide the clutch shaft through the clutch, then out the opposite side
of the compression device. Install the previously removed knob and tighten the
set screws.
10. Adjust the clutch shaft by sliding it back and forth until both knobs are equal
distances from the sides of the compression device.
11. Place a .015" feeler gauge (or equivalent shim stock) between the armature and
the clutch brake. Spread the clutch mechanism so that the clutch sprocket is
pressed firmly against the chain gears (at right), and that the armature is pressed
against the feeler gauge.
12. Tighten the locking bar mounting hardware, then remove the feeler gauge.
Check that the gap between the armature and the brake is .010" (minimum) to
.020" (maximum). Verify that there is no more than .020” left-to-right “play” in
the clutch.
13. Verify proper compression movement. Perform the following before releasing
the unit to the user:
• Chapter 4, Section 8.1, Compression Chain Tension Adjustment
• Chapter 4, Section 3.1, Compression Force Calibration
• Chapter 4, Section 3.2, Compression Thickness Calibration
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