1. A-dec 500 Adjustments
Most adjustments are set at the factory during assembly or prior to packaging so they should not need initial adjustments.
If they do require further adjustment to suit individual needs or after extended use, follow these guidelines.
There is one exception you will see on a future slide. The delivery arm rotation is one adjustment that is not factory set. The clamp must be relaxed to allow the arm to fit over the post.

2. A-dec 500 Leveling
Leveling should be checked and corrected before tension adjustments are made
Rough leveling is done during assembly
Final leveling should be done after all equipment is installed on the chair and the systems are in their normal use positions
Level from the ground up:
Link arm and Support arm
Front mount
Control head
Tray
A leveling video is available at a-dec.biz
The order of leveling is important. You should start from the ground up. First the mounts, front and support, then the delivery system and tray, then the assistants holder.
Level when all equipment is mounted on the chair and the systems are in their normal operating positions.
Leveling should be checked and corrected before adjustments are made.
Rough leveling can be done during assembly
Final leveling should be done after all equipment is installed on the chair and the systems are in their normal use positions.
Level from the ground up:
Front mount
Support arm
Control head
Tray

3. Front Mount Leveling Front Mount Final or Re-Leveling
A bubble level is fixed to the front mount to check for level
You will need two ¾” open end wrenches, a 7/16” wrench and a 5/16” hex wrench
Loosen cam bolts, leveling bolt flanged nuts and stabilization screws
Rotate cam for left – right level
Move leveling studs in or out equally for front to back leveling
Secure all fasteners to ensure leveling is locked in position
Front mount arm and delivery/monitor system should be centered over chair.
Front Mount Final or Re-Leveling:
A bubble level is fixed to the front mount to check for level
You will need a ¾” open end wrench, a 7/16” wrench and a 5/16” hex wrench
Loosen cam bolts, leveling bolt flanged nuts and Stabilizing screws
Rotate cam for left – right level
Move leveling studs in or out for front – back level
Notice how you can use either an open/box end combination wrench or 2 chair straps to keep the seat frame up so it is easy to get to the cam bolts!

4. Front Mount Rotation Stops
Stops are positioned in holes to limit arm rotation
If support center is installed, place a stop in forward position on support center side
If converting left to right, the stops can be repositioned
Front Mount Rotation Stops
Stops are positioned in holes to limit arm rotation:
If support center is installed, place a stop in forward position on support center side
If converting left to right, the stops can be repositioned
CHANGES THE MATERIAL ON THE BOM FOR THE ROTATIONAL STOP BUMPER ON THE UNIT MOUNT MODULE. THE MATERIAL , TUBING, WAS , TUBING. THIS CHANGE IS A RESULT OF QUALITY ISSUES WITH THE VINYL TUBING MATERIAL PINCHING OFF AND/OR FALLING OFF THE ROTATIONAL STOP PIN FOR THE LOWER ARM.

5. Front Mount Rotation Tension
Front Mount Tension Adjust
Use 15/16” wrench to adjust rotational tension
Nut on under side is self locking and captured
Front Mount Tension Adjust:
This should not need adjustment, but it can be used to change the rotation tension.
Use 15/16” wrench to adjust rotational tension

6. Delivery Arm Rotation Tension
Delivery System Rotational Tension Adjustment
Should be adjusted at installation
Use 3/32” hex wrench to set tension
Note that this is one adjustment that is not factory set. The clamp must be relaxed to allow the arm to fit over the post.
Delivery System Rotational Tension Adjustment
Should be adjusted at installation
Use 3/32” hex wrench to set tension
Note that this is one adjustment that is not factory set. The clamp must be relaxed to allow the arm to fit over the post.
This is a must adjust after initial installation of the delivery system because the clamp is left loose so the post will fit into the arm. So after first installing the arm to the post you should adjust the tension. Note that if you want to remove the arm after the tension has been adjusted, you will not be able to lift the arm off the post because of the clamping action. So you will have to release the tension fully to relax the clamp.

7. Delivery Flex Arm Adjustment
Delivery System Flex Arm Counter Balance Adjustment
All instruments and accessories should be installed prior to making this adjustment
Turn Master Toggle OFF to release air brake
Remove the 3 covers from rigid arm end of flex arm using a 5/64” hex wrench
Lower control head and slide flex arm cover off
Use a 7/16” open end wrench to adjust spring tension
Note: Apply Lubriplate to the cover grooves to make installation easier
Delivery System Flex Arm Counter Balance Adjustment
All instruments and accessories should be installed prior to making this adjustment
Turn Master Toggle OFF to release air brake
Remove the 3 covers from rigid arm end of flex arm using a 5/64” hex wrench
Lower control head and slide flex arm cover off
Use a 7/16” open end wrench to adjust spring tension

8. Delivery System Leveling
Front to Back Leveling Adjustment
Remove joint covers with a 5/64” hex wrench
Use 3/16” hex wrench to level control head
Turn wrench clockwise to raise front of control head
Position the delivery system centered over the chair when leveling
Delivery System
Front to Back Leveling Adjustment
Remove joint covers with a 5/64” hex wrench
Use 3/16” hex wrench to level control head
Turn wrench clockwise to raise front of control head

9. Control Head Leveling Control Head Leveling Left to Right
Use 5/32” hex wrench
Loosen and tighten the two leveling screws on opposite sides of the round support
Position the delivery system centered over the chair when leveling
Control Head Leveling Left to Right, use the two screws to “jack” the head until level in the straight ahead position.
Use 5/32” hex wrench
Loosen and tighten the two leveling screws on opposite sides of the round support

10. Control Head Rotation Tension
Control Head Rotation Tension Adjustment
Use 5/32” hex wrench
Turning wrench clockwise increases brake tension
Control Head Tension Adjustment
Use 5/32” hex wrench
Turning wrench clockwise increases brake tension

11. Tray Holder Leveling Tray Holder Leveling Adjustments
Use a 5/32” hex wrench
Left to right
Front to back
Tray Holder Leveling Adjustments
Use a 5/32” hex wrench
Left to right
Front to back

12. Tray Holder Rotation Tension
Tray Holder Adjustments
Swivel tension in two places
Remove cover for access to rotation adjustment for upper arm
Use 9/16” socket
Tray Holder Adjustments
Swivel tension in two places
Remove cover for access to rotation adjustment for upper arm
Use 9/16” socket

13. Support Link Leveling Leveling of Rear Support Link
Loosen all four ¾” cap screws
Loosen leveling bar ¾” jamb nut
Use a ¾” end wrench to turn leveling bar bolt
Tighten jam nut while holding leveling bolt
Tighten the four cap screws to secure Support Link
You will need to remove the support arm limit switch to gain access.
Leveling of Rear Support Link
Loosen all four ¾” cap screws
Loosen leveling bar ¾” jam nut
Use a ¾” end wrench to turn leveling bar bolt
Tight jamb nut while holding leveling bolt
Tighten the four cap screws to secure Support Link

14. Lower Support Arm Tension
Rotation tension
Use 3/16” hex wrench to eliminate any free play in the bearing and to increase or decrease rotational tension
This adjustment should be done when lower arm is mounted to link arm and prior to mounting modules to the arm.
Assistants Arm Leveling
This adjustment is at the top joint
Remove joint cover
Use 5/32” hex wrench to loosen the two screws
Level top of Assistant’s package
Tighten the screws to lock the new position
Move arm back and forth to observe consistent level

15. Assistants Arm Tilt Tension
Tilt up tension adjustment
Note: this tilt up resistance is factory set and should not need further adjustment
Use 3/16” hex wrench to change tilt up resistance
Assistants Arm
Tilt up tension adjustment
Note: this tilt up resistance is factory set and should not need adjustment unless required
Use 3/16” hex wrench
300 inch pound break a way force

16. Assistants Arm Rotation Tension
Remove cap from top of joint
Use 5/32” hex wrench to adjust tension
Note position of data cable and the power cord
Assistants Arm Rotation
Remove cap from top of joint
Use 5/32” hex wrench to adjust tension

17. Assistants Arm Leveling
This adjustment is at the top joint
Remove joint cover
Use 5/32” hex wrench to loosen the two screws
Level top of Assistant’s package
Tighten the screws to lock the new position
Move arm back and forth to observe consistent level
Assistants Arm Leveling
This adjustment is at the top joint
Remove joint cover
Use 5/32” hex wrench to loosen the two screws
Level top of Assistant’s package
Tighten the screws to lock the new position
Move arm back and forth to observe consistent level

18. Monitor Mount Tension Monitor Mount Adjustments
Pull tension and push resistance can be adjusted separately
Remove cover from top of mount
Use a 5/32” hex wrench
Left screw adjusts push resistance
Right screw adjusts pull tension
Monitor mount has a clutch mechanism that allows separate push and pull tension to be set.
Remove cover from top of mount
Use a 5/32” hex wrench
Left screw adjusts push resistance
Right screw adjusts pull tension

19. Dental Light Flex Arm Balance
Dental Light Adjustments
To adjust flex arm tension
Remove cover by removing the Phillips screw and the two 5/64” hex button head screws
Using a ½” open end wrench adjust tension on the spring so the light head stays in position
Dental Light Adjustments
To adjust flex arm tension
Remove cover by removing the Phillips screw and the two 5/64” hex button head screws
Using a ½” open end wrench adjust tension on the spring so the light head stays in position

20. Dental Light Adjustments
Use 5/32”” hex wrench to adjust the tension for:
Horizontal
Diagonal
Dental Light Adjustments
Use 5/32”” hex wrench to adjust the tension for:
Horizontal
Diagonal

21. Dental Light Adjustments
For vertical adjustment:
Use 5/64”” hex wrench to loosen set screw
Use flat tip screw driver to adjust tension screw
Note: Access to screw is under right side yoke plug
To focus use flat tip screw driver to obtain uniform pattern
Focus range is 18 to 31 inches
Factory set at 27 inches
Dental Light Adjustments
For vertical adjustment:
Use 5/64”” hex wrench to loosen set screw
Use flat tip screw driver to adjust tension screw
Note: Access to screw is under right side yoke plug
To focus use flat tip screw driver to obtain uniform pattern
Focus range is 18 to 31 inches
Factory set at 27 inches

22. Swivel Brake Adjustment
Swivel Brake Adjustment, p. 33
Release brake tension
Insert 7/64” hex wrench in through-hole and into adjustment screw
Turn wrench to right to increase brake friction
Hinged handle available as of Jan. ’06
P/N TBA
Jan 06: New hinged brake handle avail to replace previous versions. Hinged Brake Handle design for the 511 Chair, to replace the and Brake Handles. The new handle design addresses an identified field quality issue. The current handle is being broken, at the base of the cam, as a result of the chair being lifted by the handle to position it during install or by the chair being lowered onto the handle when the chair is unloaded from the dealer vans.
Swivel Brake Adjustment
Release brake tension, you must move the handle to the released position in order to get the hex wrench through the hole and into the adjustment screw.
Insert 7/64” hex wrench in through-hole and into adjustment screw
Turn wrench to right to increase brake friction
The actual brake pad is the brass cylinder with an alignment groove in the top.

23. Headrest Adjustment Headrest clutch assembly is not serviceable.
Headrest lever adjustment
Amount of play in lever actuation can be adjusted
Use 1/16” hex wrench to control amount of play in lever actuation
Headrest clutch assembly is not serviceable.
511 Chair Headrest Locking Mechanism
A few of the A-dec 511 chair headrests have been built with inadequate actuation lever clearance. This lack of clearance results in headrests which do not hold position. These are not field serviceable units and must be exchanged for new ones ( ) using the FIR process. If your customers have inadequate tension in their headrest mechanism, please return the headrests that are affected. As of August 13, 2004 all production has been corrected.
Headrest lever adjustment:
Amount of play in lever actuation can be adjusted
Use 1/16” hex wrench to control amount of play in lever actuation

24. Glide bar Adjustment Glide bar adjustment Use 1/8” hex wrench
Turn clockwise to increase friction on glide bar
Glide bar adjustment
Use 1/8” hex wrench
Turn clockwise to increase friction on glide bar

25. Air Pressure Adjustment
Adjust Air Regulator to 80 PSI
Rotate the pre regulator knob to change system air pressure
Clockwise to increase air pressure
Counter clockwise to decrease air pressure, note: you will need to release some air from the system to get an accurate reading
Adjust Air Regulator to 80 PSI
Rotate the pre regulator knob to change system air pressure
Clockwise to increase air pressure
Counter clockwise to decrease air pressure, note: you will need to release some air from the system to get an accurate reading
Note also that there is no water regulator adjustment now. The water regulator utilizes 80 PSI which is then reduces to about ½ (40PSI) by the use of the white spacer.

26. Water Pressure Water regulation
Water bottle has built in regulator set to maintain 40 PSI. Not adjustable.
City water regulator has built in pressure reducer to maintain 35 to 40 PSI
Air regulator
Check/replace air filter
Set regulated air pressure to 80 PSI
Water regulator
Check/replace water filter
For proper operation:
Air: 2.5 cfm (70.8 liters/minute) at 80 psi (551 kPa)
Water: 1.5 gpm (5.68 liters/minute) at 40 psi (276 kPa)
Vacuum: 12 cfm ( liters/minute) at 8 inches of mercury (27 kPa)

27. Cuspidor Water Adjustment
Cuspidor Water Intensity Adjustments
Correct intensity adjustment will prevent splash and splatter
Cup fill intensity is the lower of the two top flow controls.
Note: the uppermost is reserved for future use
Bowl rinse intensity adjust is on bottom
Use 1/8” hex wrench to adjust desired water flow
Cuspidor Water Intensity Adjustments
Correct intensity adjustment will prevent splash and splatter
Cup fill intensity is the lower of the two top flow controls.
Note: the uppermost is reserved for future use
Bowl rinse intensity adjust is on bottom
Use 1/8” hex wrench to adjust desired water flow

28. Cuspidor Water Flow Timing
Cuspidor Water Cup Level and Bowl Timing Adjustments
Cup fill level is factory set to 2.5 seconds
Bowl rinse timing is factory set to 15 seconds
To change cup level or bowl timing:
Press the program button (1 beep)
Press cup or bowl button for as long as flow is desired then release (3 beeps confirms setting)
To stop a timed flow, press the button once
Cuspidor Water Cup Level and Bowl Timing Adjustments
Cup fill level is factory set to 5 seconds
Bowl rinse timing is factory set to 30 seconds
To change cup level or bowl timing:
Press the program button (1 beep)
Press and hold cup or bowl button for as long as flow is desired then release (3 beeps)
To stop a timed flow, press the button once

29. Control Block Adjustments
Control block adjustments for handpiece operation
Begin by closing all control valves: drive air, air coolant and water coolant
Water coolant adjustment
Lift handpiece from holder
Select water coolant and press Foot Control
Open water coolant flow control until one drop of water per two seconds is observed
Control block adjustments for handpiece operation:
Begin by closing all control valves: drive air, air coolant and water coolant
Water coolant adjustment
Lift handpiece from holder
Select water coolant and press Foot Control
Open water coolant flow control until one drop of water per two seconds is observed
Note: If drive air flow interferes, it can be pinched off

30. Control Block Adjustments
Control block adjustments for handpiece operation
Air coolant adjustment
Open air coolant flow control until a fine mist is observed
Control block adjustments for handpiece operation
Air coolant adjustment
Open air coolant flow control until a fine mist is observed

31. Drive Air Readout
Digital readout of Drive Air Pressure on the control PCB
Reference only and not to be used to set pressure.
It will read higher than actual depending on HP, tubing length/material.
If needed, it can be used to verify HP or control block operation.
Control block adjustments for handpiece operation
Digital readout of Drive Air Pressure on the control PCB is for reference only and not to be used to set pressure.
It will read higher than actual depending on HP, tubing length, material.
If needed, it can be used to verify HP or control block operation.
If you are operating W&H handpieces, you could set the digital readout to 51, this should equate to 45 PSI and the HP.

32. Drive Air Pressure Gauge
Drive air adjustment using a handpiece pressure gauge
Open control head cover
Lift handpiece from holder
Press on Foot Control
Rotate Drive Air flow control on top of block associated with the selected handpiece position
Observe true Drive Air pressure on gauge
This is the recommended method for setting handpiece drive air pressure.
Control block adjustments for handpiece operation
Drive air adjustment using a handpiece pressure gauge
Open control head cover
Lift handpiece from holder
Press on Foot Control
Rotate Drive Air flow control on top of block associated with the selected handpiece position
Observe true Drive Air pressure on gauge

33. Syringe Flow Adjustment
Syringe air and water flow adjustment
Delivery System syringe flow control adjustment inside control head
Lift up control head cover for access
Assistant’s syringe flow control adjustment in lift arm
Remove lift arm cover for access
Syringe flow control is maintained by dual pinch valves. One screw sets the air pressure and one screw sets the water flow.
Note that these may need a follow up adjustment to increase flow/pressure. This is because the vinyl material of the tubing flattens out over time creating a larger area of decreased flow/pressure.

34. A-dec 500 Adjustments

35. A-dec 500 Maintenance
The items requiring periodic maintenance will be reviewed.
The adjustments should also be checked and re-adjusted if necessary as part of a maintenance plan.

36. Hydraulic Fluid Chair hydraulic fluid
Position chair base and back full up
Remove both the lift arm cover and the safety plate cover
View fluid level from the rear
Top up if need, cycle chair, inspect system for leaks
Use only A-dec Hydraulic fluid P/N
Chair hydraulic fluid
Position chair base and back full up
Remove both the lift arm cover and the safety plate cover
View fluid level from the rear
Top up if need, cycle chair, inspect system for leaks
Use only A-dec Hydraulic fluid P/N System holds 36oz.

37. Air and Water Filters Air regulator Water regulator Notes:
Check/replace air filter
Water regulator
Check/replace water filter
Notes:
Turn off supply valves before attempting to remove filter caps.
Install new filter with stepped edge down against manifold.
Air regulator
Check/replace air filter
Set regulated air pressure to 80 PSI
Water regulator
Check/replace water filter

38. Handpiece Oil Collector
Cap hinges down for access
Cap pulls off on models after July 2005
Gauze pad should be change weekly
Note:
Muffler can be replace if missing or dirty with P/N

39. Vacuum Solids Collector
Solids Collector pulls off for access to collection screen
Collection basket should be changed or cleaned daily
Hot water should be drawn through the vacuum instruments daily
Screens are available for vacuum instruments to prevent large objects from entering the tubing
Solids Collector
Collection basket should be changed or cleaned daily
Hot water should be drawn through the vacuum instruments weekly
Screens are available for vacuum instruments to prevent large objects from entering the tubing

40. Waterline Maintenance
ICX Waterline maintenance
One tablet in empty water bottle
Fill with treatment water
Wait one minute
Connect to unit
Repeat for each bottle refill
Type of Water
Tap
Distilled if tap water contains high mineral content
Shock treatment
If test show high bacteria level
Sterilex Ultra startup
ICX maintenance
ICX tablet needs to be added to each refill of the bottle. Do not touch tablet, just to preclude any contamination of the tablet and the water.
Tap water is fine if not too hard or purity is doubtful.
Distilled will work fine too but not a requirement.
Testing can be done to determine bacterial level:
ADA recommends lower than 200 CFU
CDC recommends lower than 500 CFU
Testing can be done with in-office testers from Millipore or in a lab
Shocking the unit with Sterilex Ultra is recommended to get the unit’s lines cleaned up, then use ICX

41. A-dec 500 Adjustments Questions?
Most adjustments are set at the factory during assembly or prior to packaging so they should not need initial adjustments.
If they do require further adjustment to suit individual needs or after extended use, follow these guidelines.
There is one exception you will see on a future slide. The delivery arm rotation is one adjustment that is not factory set. The clamp must be relaxed to allow the arm to fit over the post.