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Ultra Chair Scheduled Maintenance

The Semi-annual Maintenance Recommendations Chart lists inspections and services that should be performed periodically on the Midmark® Ultra-Series Dental Chair.

Semi-annual Maintenance Recommendations
Inspection or Service	What to Do
Obvious damage	Visually check condition of chair for obvious damage such as: cracks in components, missing components, dents in components, frayed or damaged cords, or any other visible damage which would cause chair to be unsafe to operate or would compromise its performance. Repair chair as necessary.
Fasteners / hardware	Check chair for missing or loose fasteners / hardware. Replace any missing hardware and tighten any loose hardware as necessary.
Warning and instructional decals	Check for missing or illegible decals. Replace decals as necessary.
Pivot points / moving parts / accessories	Lubricate all exposed pivot points, moving parts, and accessories with silicone based lubricant.
Membrane switch panels	Check each switch on each membrane switch panel for proper operation. Depress each membrane switch to make sure selected function operates. If any switch does not work, Refer to: Troubleshooting.
Foot control	Check each switch on foot control for proper operation. Depress each foot control switch to make sure selected function operates when its button is depressed. If any switch does not work. Refer to: Troubleshooting Guide.
Base and Back Hydraulic Cylinders	Check Base and Back hydraulic cylinders and related fittings . If cylinders or fittings will not operate properly due to external or internal hydraulic fluid leakage, repair or replace cylinder or fitting(s). Refer to: Hydraulic Back Cylinder.
Hydraulic Motor Pump and Capacitor	Check hydraulic motor pump operation per instructions in Operational Test, para 2.1. If motor does not lift properly Refer to: Troubleshooting and repair or replace malfunctioning component(s).
Hydraulic Reservoir	Check condition of reservoir, related fittings and fluid level. If necessary, correct any problem and/or add fluid. Refer to: Hydraulic Reservoir and Hydraulic Fluid Level.
Headrest	Check headrest for proper operation by sliding headrest up and down. Headrest should not take excessive force to move but should require a slight force to begin movement. If necessary, adjust headrest Refer to: Headrest Adjustments.
Rotation	Check rotation for proper operation. Unlock brake and rotate chair top. Chair top should rotate smoothly and easily 30° (15° for LR Models) in each direction from centerline of chair. If binding occurs, adjust or repair brake. Refer to: Rotational Brake. Move brake release lever to brake position and attempt to rotate chair top. Chair top should not be able to be moved. If necessary, adjust or repair brake. Refer to: Rotational Brake.
Safety Bail Limit Switches	Test both Safety Bail Limit switches to assure they function, stopping the chair’s. Press upward on the bottom lift arm cover during the descent. If descent continues adjust or replace malfunctioning limit switch(es). Refer to: Back Potentiometer.
Upholstery	Check all upholstery for rips, tears, or excessive wear.
Accessories	Check that all accessories have all of their components and that they function properly.
Operational Test	Perform an Operational Test to determine if the chair is operating within its specifications. Refer to: Operational Test. Replace or adjust any malfunctioning components.