Midmark 411 / 417 Series

Preventive Maintenance Procedure

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Asset Type

Exam Table

Manufacturer

Midmark

Model

411 / 417 Series

Models Covered

Midmark 411-001 through 411-018 Power Examination Tables and Midmark 417-001 through 417-003 Power Podiatry Treatment Tables. Identify the complete dash number and serial prefix before testing: 411-001 through -008 use AV, DJ, or DW; 411-009 through -010 use FA or FB; 411-011 through -018 use GT, GV, HY, JX, JY, or LS; 417-001 through -003 use BP, EP, or V. Do not transfer revision-specific limits or interlock behavior between families.

Manual Reference

Midmark 411 Service and Parts Manuals, Part Nos. 004-0004-00 and 004-0042-00, for the applicable dash number/serial prefix; and Midmark 417-001 through -003 Service and Parts Manual, Part No. 003-0709-00 Rev. R. Use the exact current manual for the nameplate configuration.

Manufacturer Recommendation / AEM Status

The 411 and 417 service manuals specify the scheduled-maintenance inspection semiannually. The charts require inspection for damage, hardware, labels, controls, actuators, interlocks, accessories, upholstery, receptacles, lubrication, and the complete operational test. Midmark's service program also describes annual inspection, operational, leakage-voltage, and ground-fault testing; this procedure retains the more frequent six-month service-manual interval.

Use trained, qualified personnel and the revision-specific manual. A longer interval requires a documented facility AEM assessment and may not omit an applicable OEM safety or performance check.

What This PM Procedure Covers

Required Tools and Equipment

Step-by-Step PM Procedure

1. Verify Identity and Manual Applicability

Action: Record asset tag, complete model/dash number, serial number/prefix, voltage, department, programmable/non-programmable configuration, controls, and accessories. Match the nameplate to the correct 411 or 417 manual and document which branch below applies.

Expected outcome: The equipment and CMMS record agree, and the correct revision-specific limits and safety functions are established before testing.

2. Review History and Prepare Safely

Action: Review prior PMs, repairs, drift, motion, noise, control, interlock, receptacle, and electrical-safety complaints. Remove the patient and clinical load, clear the full motion envelope, unplug before inspection, and plan safe handling of test weights.

Expected outcome: Known defects and repair-related retest needs are identified, and the table is safely controlled for PM.

3. Clean and Inspect Patient Surfaces

Action: Clean only with products compatible with the applicable Midmark manual. Inspect the seat, back, headrest, foot/leg section, seams, attachment points, and retainers for rips, tears, excessive wear, looseness, contamination, or exposed substrate.

Expected outcome: Surfaces are clean, securely attached, dry, and free of damage affecting safe use or infection control.

4. Inspect Structure, Hardware, and Labels

Action: Inspect covers, frame, base, column, welds, pivots, mounting points, fasteners, floor-contact surfaces, and power-entry area for cracks, dents, looseness, missing parts, corrosion, or other damage. Verify warning, instructional, load, model, and serial labels are present and legible.

Expected outcome: No visible condition compromises safety or performance; required hardware is secure and labels are readable.

5. Inspect Power and Control Components

Action: Inspect the hospital-grade cord, grounding pin, plug, strain relief, hand control, foot control, membranes, pedals, connectors, and hangers for damage, pinching, contamination, looseness, overheating, or unintended activation.

Expected outcome: Power and control components are intact, correctly retained, and safe to energize.

6. Inspect and Lubricate Moving Components

Action: Qualified personnel shall inspect exposed pivots, moving parts, accessories, slides, and actuator ball screws. Apply silicone-based lubricant to the points specified by the exact manual. Where the scheduled-maintenance chart calls for ball-screw service, extend the actuator as directed, wipe foreign matter from exposed threads, apply STP treatment oil or the approved equivalent, cycle through travel twice, and remove excess.

Expected outcome: Required points are clean and correctly lubricated, motion is smooth, and no lubricant contaminates patient surfaces, controls, or flooring.

7. Verify Installed Controls and Safety Disable Functions

Action: Connect to a grounded, correctly polarized outlet of the nameplate voltage. With the path clear, operate every installed hand- and foot-control function. On 417 units, place CONTROL DISABLE in disable and confirm no TABLE, BACK, or TILT command operates; re-enable and retest.

Expected outcome: Each control commands only the selected direction, motion stops correctly, and the 417 control-disable switch prevents powered movement when disabled.

8. Verify Powered Motion and Published Limits

Action: Run each function through full travel while observing smoothness, clearance, endpoint stopping, and abnormal noise. For applicable 60 Hz 411 units, use the exact service-manual limits; commonly published 411 limits are base 12 ±1 seconds and 22-40 inches ±1 inch, back 10 ±1 seconds and 0-85 degrees, tilt 14 ±1 seconds and 0-30 degrees foot-up, and foot 12 ±1 seconds and -90 to 0 degrees. For 417 units, verify TABLE 22.5-41 inches, TILT 0-30 degrees, BACK -16 to -83 degrees, with TABLE up about 15 seconds, BACK up about 8 seconds, and TILT up about 8 seconds. Do not apply these values to a configuration the manual excludes.

Expected outcome: Every powered function moves steadily through its applicable range and time without binding, squeal, excessive noise, or incorrect direction.

9. Check Actuator Drift and Endpoint Protection

Action: Position each powered section away from an endpoint, release the control, and observe for unintended movement. Verify base limit switches stop travel before mechanical damage or sustained freewheeling; do not continue commanding a stalled function. On 417, confirm AUTO RETURN completes without base freewheeling and STOP interrupts automatic movement.

Expected outcome: No section drifts; limit switches stop motion correctly; 417 AUTO RETURN and STOP operate safely.

10. Perform 411-Specific Safety and Accessory Checks

Action: On 411 units only, verify the treatment pan is fully stowed before FOOT UP can operate and that the applicable PAN OUT indication works. Test the early-unit headlock interlock only when the exact manual confirms it is installed. Verify the foot extension latches, stirrups lock in all three positions, pan slides/locks, headrest joints hold, and the applicable headrest supports 45 lb without drift.

Expected outcome: Revision-applicable 411 interlocks prevent hazardous motion, and all manual accessories move smoothly and lock securely.

11. Perform 417-Specific Mechanical Checks

Action: On 417 units only, verify armrests remain parallel to the seat with the back fully raised, the foot section moves correctly, and the foot-section brake lever holds it securely. Check the base subassembly for excessive fore/aft play and verify installed gas-spring-supported and plastic sections remain secure.

Expected outcome: Armrests align correctly, the foot section is secure when its brake is released, and the base has no excessive play.

12. Verify Programmed Functions When Equipped

Action: Record existing programmed positions. Using safe unloaded positions and the exact operator manual, test PROGRAM storage/recall, position buttons, HOME or AUTO RETURN, indicators, warning tones, and STOP/interruption behavior. Restore the original facility positions. Do not perform control-board calibration or reinitialization unless the service manual and qualified-service workflow require it.

Expected outcome: All installed programmed functions operate and stop as documented, with original settings restored.

13. Inspect Stability, Accessories, and Receptacles

Action: With power removed and the table at a safe height, check the column/base for excessive play without entering pinch points. Inspect paper holder, treatment/podiatry accessories, rails, attachments, and options. On applicable 115 VAC units, inspect and safely test accessory receptacles without exceeding their rating.

Expected outcome: The table is stable, accessories are complete and secure, and receptacles provide stable correctly wired power without damage or heat.

14. Perform the Model-Specific Load Test

Action: Only when authorized by the exact manual and facility lifting policy, secure and distribute the specified test load on the seat: approximately 325 lb for the applicable 411 operational test or 300 lb for the 417 operational test. Raise and lower TABLE/BASE through the manual-specified travel once while observing motion, noise, and endpoint protection, then remove the load safely. Never use personnel as test weight.

Expected outcome: The base raises and lowers the applicable load without stall, squeal, excessive noise, or faulty endpoint stopping.

15. Perform Electrical Safety Testing

Action: Perform protective-earth continuity and applicable equipment/enclosure leakage-current tests under the facility's adopted standard for grounded medical equipment. Exercise the cord during earth testing and include installed receptacles as required. Record analyzer ID, standard, configuration, limits, and readings; the cited service manuals do not provide numeric electrical-PM acceptance limits.

Expected outcome: Protective-earth continuity is stable and all leakage readings pass the documented governing standard.

16. Restore, Final-Check, and Document

Action: Remove test loads and tools, wipe away excess lubricant, reconnect and secure controls/accessories, restore programmed positions and normal configuration, then perform a final unloaded motion, stop, interlock, and visual check. Document measured times/ranges, load and safety-function results, electrical readings, parts, corrective action, and disposition.

Expected outcome: The table is clean, complete, correctly configured, and either returned to service with traceable results or clearly removed from service.

Electrical Safety Testing

The 411 and 417 families use grounded hospital-grade power connections. Perform protective-earth continuity and applicable equipment/enclosure leakage testing to the facility's current adopted standard, including installed accessory receptacles where applicable. The cited OEM service manuals do not publish numeric electrical-PM acceptance limits; document the governing standard and its limits rather than inventing values. Any intermittent ground path, damaged cord/plug, incorrect receptacle result, or leakage value above the adopted limit is a failure.

Pass / Fail Criteria

Pass

Remove From Service

Copy/Paste CMMS Work Order Procedure

Follow the exact current Midmark manual for the complete dash number and serial prefix. This field guide does not replace OEM training, revision-specific service documentation, safe test-weight handling, or facility policy.

Sources

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