A-dec 511 Dental Chair
Copyright 2005
All Rights Reserved
1
Product Overview – Pg 10

A-dec 511 Chair

Features
 Headrest
 Armrest
 Baseplate
 Back
 Seat
 Hydraulic Motor Pump Assembly
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2
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
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3
Chair Specifications – Pg 12

Chair Power Supply


Comes standard with the 511
chair
Electric switch connects the
power supply to pilot air
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4
Chair Flow Diagram – Pg 15
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5
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
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6
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
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7
Chair Circuit Board – Pg 18-19

Circuit Board Components

Refer to the table on page 18 and Figure 6 on page 19
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8
Chair Circuit Board Revisions

Rev D



Rev E


Adds bump up when chair lockout detected
Increased electrical current for lift and support arm limit switches, released
01/05
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
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9
Circuit Board Components – Pg 20

LED Identification
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11
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.
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12
Hydraulic System

Bidirectional motor


Replace as compete assembly
Depressurize the system
before disassembling
hydraulic components.
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13
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.
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14
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
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15
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
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16
Hydraulic System – Pg 23

Capacitor


The capacitor is energized during
chair Base Up or Back Up
functions.
Voltage and mF specific
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17
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.
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18
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 for
Base Down and Back Down
Accumulator
Copyright 2005
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19
Potentiometer – Pg 25

Back and base pots are
interchangeable assemblies

P/N 90.1069.00
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20
Chair Stop Plate – Pg 26

Activation causes chair to
stop down movement,
PCB signals momentary
base up
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21
Swivel Brake – Pg 27

Swivel Brake Adjustment



Release brake tension
Insert 7/64” hex wrench in throughhole and into adjustment screw
Turn wrench to right to increase
brake friction
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22
Headrest – Pg 28

Drift Adjustment


Use 1/8” hex wrench
Turn clockwise to increase
friction on glide bar
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23
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
Copyright 2005
All Rights Reserved
24
A-dec 511 Dental Chair
Copyright 2005
All Rights Reserved
25