PM: Inspect and maintain the couch clutch/brake assembly (dry type)
Perform this preventive-maintenance task on the patient couch's clutch/brake assembly — the dry-type unit sitting between the couch's longitudinal-drive motor (M11) and the drive pulley (see the longitudinal-drive theory page in Related). It combines a routine maintenance checklist with the inspection checks to run whenever the clutch or brake misbehaves.
Tools & parts
| Item | Part number | Qty |
|---|---|---|
| Clutch/brake assembly (couch horizontal/longitudinal-drive, dry type) | n/a in source | 1 (assy) |
| Mounting bolts / small screws (clutch/brake assembly hardware) | n/a in source | as fitted |
| Brake release lever | n/a in source | 1 |
Safety
Hazard: Oil, grease, or any other contaminant reaching the friction surfaces of this dry-type clutch/brake assembly
Consequence: Operation failure or suction failure of the clutch/brake
Avoidance: Never allow oil or other contaminants to reach the friction surfaces — this assembly is dry-type and must not be lubricated
Hazard: Armature-to-rotor clearance increasing beyond 0.5 mm as the clutch friction surface gradually abrades with use
Consequence: Operation failure or suction failure of the clutch/brake
Avoidance: Periodically check the clearance; if it exceeds 0.5 mm, stop relying on the assembly and return it to Toshiba/Canon Nasu Operations rather than continuing to run it or repairing it on-site
Hazard: Excessive force applied to the brake release lever when releasing the brake for a power failure or electrical problem
Consequence: The lever is deformed or damaged, and the brake can then no longer be released using the lever
Avoidance: Do not apply excessive force to the release lever; before turning the system power back ON, confirm that no force remains applied to the release lever
Full step-by-step for PM: Inspect and maintain the couch clutch/brake assembly (dry type)
All 5 steps are documented in the FSELIB Activion16 (TSX-031A) service manual — re-authored, web-first, with the real figures from the source.
Open the full procedureRelated Couch/Table guides
Source: 2D201-112EN*D §2.6.8 (pp. 171-172) — Maintenance and inspection of the clutch/brake assembly. Preview re-authored by FSELIB — the full procedure with figures and steps is in the paid service manual.