Replace the patient couch hydraulic unit
Remove and replace the hydraulic unit — the cylinder, oil tank, and motor pump assembly that raises and lowers the patient couch (see Related: vertical-drive theory) — when it malfunctions. This is heavy, two-person work: the couch itself must be lowered onto support bars and held there while the old unit comes out and the new one goes in.
Tools & parts
| Item | Part number | Qty |
|---|---|---|
| Hydraulic unit (cylinder + oil tank + motor pump assembly) | n/a in source | 1 |
| Securing screws, motor pump/oil tank mounting bracket (M4) | n/a in source | 4 |
| Bolt, cylinder-to-upper-frame (M6) | n/a in source | 2 |
| Screw-locking compound | n/a in source | n/a in source |
| Retainer, cylinder lower-end shaft | n/a in source | 1 |
| Cable clamps / cable ties | n/a in source | n/a in source |
| Straps, 3 m | n/a in source | 2 |
| Support bars, 50 mm × 50 mm × 600 mm | n/a in source | 2 |
| Phillips screwdriver, No. 2 (medium size) | n/a in source | 1 |
| Hexagonal wrenches, 3 mm and 5 mm | n/a in source | 1 |
| Hammer | n/a in source | 1 |
| Punch | n/a in source | 1 |
Safety
Hazard: Bending or kinking the hydraulic hose while handling it during mounting (minimum permissible bend radius: 45 mm)
Consequence: The hose is permanently damaged and can no longer be used
Avoidance: Be extremely careful when handling the hydraulic hose at every step; keep it clear of the 45 mm minimum bend radius (source CAUTION, §2.5.3.3; see safety library G-CB12)
Hazard: Handling the heavy hydraulic unit (cylinder + oil tank + motor pump) with fewer than two workers, or disturbing the support bars before the couch is confirmed to be securely resting on them (Removing, Steps 4–10)
Consequence: Dropped component causing injury, or the patient couch shifting/lowering further and crushing a hand or foot
Avoidance: Use two workers as specified in Preparation — one to hold the cylinder, one to hold the tank/pump (Removing, Step 10); place both support bars at the specified locations and positively confirm the couch cannot lower any farther before disconnecting anything (Removing, Steps 4–5). Not printed as a callout in §2.5.3 itself; grounded in the section's own opening statement that "this work involves the handling of heavy objects" and in the couch heavy-load cautions the safety library documents elsewhere (G-CA16, G-CA17).
Hazard: Removing the hose clamps or disconnecting the hydraulic-hose connector before the CT system's power is confirmed OFF (between Removing Steps 5 and 6)
Consequence: Electric shock or unexpected system operation
Avoidance: Complete Removing Step 5 (turn OFF power of the CT system, once the couch is confirmed securely supported) before Step 6's clamp/connector work. Sequence is explicit in source; the general power-isolation principle is codified separately in the safety library as G-D02/G-W01.
Full step-by-step for Replace the patient couch hydraulic unit
All 25 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 §2.5.3 (pp.149–154) — Replacing the hydraulic unit. Preview re-authored by FSELIB — the full procedure with figures and steps is in the paid service manual.