A-dec 511 Dental Chair

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A-dec 511 Dental Chair


Product Overview – Pg 10 A-dec 511 Chair

Features Headrest Armrest Baseplate Back Seat Hydraulic Motor Pump Assembly


Chair Specifications – Pg 11 Load Capacity

Patient 300 lb (135 kg) Accessory 250 lb (113 kg) Note: Bolt chair to floor

Power On/Off Button Limp-Along Feature


Chair Specifications – Pg 12 Chair Power Supply

Comes standard with the 511 chair

Electric switch connects the power supply to pilot air


Chair Flow Diagram – Pg 15


Service/Usage Information – Pg 16 Chair Covers

Motor pump cover requires hex wrench

Lift arm cover: pull outward to flex cover over stops

Stop plate cover: pull tabs out over pegs


Service/Usage Information – Pg 17 Factory Default Routine

Sets the base and back upper limits Calculates new presets base on actual range of the chair Verifies that the potentiometers work


Chair Circuit Board – Pg 18-19 Circuit Board Components

Refer to the table on page 18 and Figure 6 on page 19


Chair Circuit Board Revisions

Rev D Adds bump up when chair lockout detected Increased electrical current for lift and support arm limit switches, released

01/05

Rev E Base up/down travel limits can be set, released 04/05

Rev F Positioning improved when using button for x-ray/rinse, released 06/05


Circuit Board Components – Pg 20 LED Identification


Hydraulic System – Pg 21 How the Hydraulic System Operates

Motor-driven hydraulic pump with solenoids Hydraulic cylinders Hydraulic Fluid Reservoir

Check with base and back full up Use only A-dec fluid 61.0197.00

System holds 40 ounces 1.18 liters.


Hydraulic System Bidirectional motor

Replace as compete assembly

Depressurize the system before disassembling hydraulic components.


Hydraulic System – Pg 22 Hydraulic Cylinders

The hydraulic cylinders operate during Base Up and Back Up functions. Springs and gravity retract the piston during Base Down and Back Down functions.

The chair seat travels vertically from a low point of 13.5” (343mm) to a high point of 31.5” (800mm) above the floor.


Chair Hydraulic Base Cylinder Base cylinder replacement

Remove motor pump, lift arm and stop plate covers

Position chair base up Lower chair on solid support Remove rod screw and the pivot

pin Remove reservoir cap Operate base down while pushing

rod into cylinder Remove 2 screws at base of

cylinder Remove hydraulic hose from

cylinder


Chair Hydraulic Back Cylinder Back cylinder replacement

Remove seat and back upholstery Position chair back down Remove hydraulic hose and vent

line from cylinder Remove snap ring at rear of

trunion Unscrew cylinder rod from

bearing clevis using a 9/64 hex key through hole

Pull cylinder out from front of trunion


Hydraulic System – Pg 23 Capacitor

The capacitor is energized during chair Base Up or Back Up functions.

Voltage and F specific


Hydraulic System – Pg 24 Solenoids

Down only Line voltage specific

How to Test Solenoids To check for a failed solenoid,

test the solenoids using a volt/ohm meter or magnetic pull test.


Hydraulic System Pump Motor Assembly

Soft Start/Stop Accumulator - dampens hydraulic shock

by acting like a shock absorber. Bi-directional Pump

Turns one direction for Base Up,the opposite for Back Up

Gravity and springs only forBase Down and Back Down

Accumulator


Potentiometer – Pg 25 Back and base pots are

interchangeable assemblies P/N 90.1069.00


Chair Stop Plate – Pg 26 Activation causes chair to

stop down movement, PCB signals momentary base up


Swivel Brake – Pg 27 Swivel Brake Adjustment

Release brake tension Insert 7/64” hex wrench in through-

hole and into adjustment screw Turn wrench to right to increase

brake friction


Headrest – Pg 28 Drift Adjustment

Use 1/8” hex wrench Turn clockwise to increase

friction on glide bar


IPB – Pgs 29-47 Part Identification

Baseplate & Motor Pump Assembly Hydraulic Hose & Solenoid Assembly Lift Cylinder & Link Arm Lower Assembly Upper Structure/Swivel Assembly Upper (Seat Assembly) Headrest Assembly


A-dec 511 Dental Chair

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A-dec 511 Dental Chair