Forest Dental DentalEZ 3900 Installation Instruction

Delivery Bearing Assembly

Pivot cover 1. Place a thrust washer on the bearing surface of the arm pivot pin.
3/8-16 x 2-1/4" Hex bolt
2. Apply lubricant to a thrust bearing and install the bearing, followed by a second thrust washer.
3. Insert arm pivot pin and bearing stack into pivot delivery arm.
3/8" Lock washer
4. Position a thrust washer onto the flat member of the pivot delivery arm and arm pivot pin.
5. Apply lubricant to the second thrust bearing and install followed by a thrust washer.
3/8" Flat washer
6. Insert the arm pivot pin and pivot delivery arm with thrust bearing and washers into the chair
Arm pivot pin
adapter.
Slot CAUTION: To avoid damage to the pivot bushing, do not use force when installing the arm
pivot pin into the pivot delivery arm.
Thrust washers
Thrust bearing
NOTE: Engagement is a slip fit, provided the pivot delivery arm is held in alignment.
Tapped hole
7. Make sure the arm pivot pin slot faces the side of the pivot delivery arm having the
tapped hole.
1/4-20 x 3/8"
8. Seat the bearing assembly until the arm pivot pin is in full contact with the bottom and
set screw
Pivot delivery sides of the chair adapter.
arm
Thrust washers
9. Use 3/8-16 x 2-1/4" hex bolt, lockwasher and flat washer to secure arm pivot pin to chair
Thrust bearing adapter.
10. Locate the 1/4-20 x 3/4" set screw in the threaded hole on the chair adapter. Tighten the
Post stop
set screw to prevent the arm pivot pin from rotating.
Chair adapter
12. Place a 1/4-20 x 3/8" set screw into the threaded hole in the flat end of the pivot delivery arm.
13. Engage the 1/4-20 x 3/8" set screw with a 1/8" hex key to deform the internal bushing
against the arm pivot pin until a 3-pound force is achieved to rotate the pivot delivery arm.
1/4-20 x 3/4"
14. Install the pivot cover over the bolt head.
set screw

Light/Monitor Bearing Assembly

1. Plug in the chair to mains power.
2. Raise the chair base to its upper travel limit and disconnect from mains power.
3. Apply lubricant to both sides of all thrust washers and thrust bearings.
Arm stop
1/4-20 x 3/4"
4. Place a thrust washer, bearing and another thrust washer onto the arm pivot pin. Insert the
Set screw
arm pivot pin and bearing stack through the 1-1/4" brass bushing at the end of the pivot
light/monitor arm. Place another thrust washer, bearing and thrust washer onto the arm
Chair
pivot pin.
adapter
5. While holding the bearings and arm pivot pin in the pivot light/monitor arm, align the slot
in the arm pivot pin with the chair adapter's bottom counter bore. Adjust the pivot light/
Thrust washers
Counter bore
monitor arm and arm pivot pin so it will slide into the counter bore.
CAUTION: To avoid damage to the pivot bushing, do not use force when installing the arm
Thrust bearing
1/4-20 x 3/8"
pivot pin into the pivot light/monitor arm.
Set screw
Pivot light/monitor
NOTE: Engagement is a slip fit, provided the pivot light/monitor arm is held in alignment.
arm
Tapped hole
6. Seat the bearing assembly until the arm pivot pin is in full contact with the bottom and
1-1/4" Brass bushing
sides of the chair adapter.
7. Make sure the arm pivot pin slot faces the side of the light/monitor arm having the tapped hole.
Thrust bearing
8. While holding the pivot light/monitor arm in position, install the 3/8-16 x 2-1/4" hex bolt
Thrust
with 3/8" lock and flat washers through the arm pivot pin so that it threads into the chair
Slot washers
adapter. Tighten the bolt enough to remove most of the clearance between the bearings.
9. Install the 1/4-20 x 3/4" set screw into the threaded hole on the pivot light/monitor arm.
Arm pivot pin
Tighten the set screw to prevent the arm pivot pin from rotating.
3/8" Flat washer
10. Finish tightening the bolt in the arm pivot pin until all the clearance between the bearings
are eliminated and the pivot light/monitor arm move freely. Tighten the set screw.
3/8" Lock
3/8-16 x 2-1/4" Bolt 11. Place the 1/4-20 x 3/8" set screw into the threaded hole of the flat end of the pivot light/
washer
monitor arm.
Pivot cover
12. Engage the 1/4-20 x 3/8" set screw with a 1/8" hex key to deform the internal bushing against
the arm pivot pin until a 3-pound force is achieved to rotate the pivot light/monitor arm.
13. Install the pivot cover over the bolt head.
Forest Dental Equipment
Phone 800 . 423 . 3555  503 . 640 . 3012 Fax 503 . 693 . 9715
|
DTE Oregon, Inc.
Address 6200 ne cherry drive hillsboro oregon 97124
Digital sales@forestdental.com
|  forestdental.com
7.13.20 0097-046
  Rev. A
Alert Symbols
The safety notices associated with the following should be given special attention when they appear in maintenance,
operating and emergency procedures in the guide.
CAUTION indicates that a particular procedure or precaution must be followed to avoid system irregularity or possible damage to the product.
NOTE indicates special information to improve the ease of maintaining the product, or to clarify important information.
WARNING indicates that the personal safety of the patient, end user or technician could be compromised by disregarding the WARNING.
Not following instructions may result in an injury.
CAUTION: Field modifications that alter the electrical and/or mechanical safety of Forest products conflict with agency construction file
requirements and are not sanctioned by Forest.
NOTE: Installation Verification: Refer to Operator's Guide or Service Manual on our website at Forestdental.com; perform all operations.
If operations performing as intended installation complete. If operations not performing as intended, review steps in installation instructions
to confirm correct installation or call Forest Technical Support at 800-423-3555.
Tools Required: 1/8", 3/16", 5/32" & 5/16" Allen Wrenches, 1/8", & 5/16" Allen Sockets with Torque Wrench, 15/16" Wrench, Standard and
Metric Hex Key Set, Flathead Screwdriver, Bubble Level, and Nitrile Gloves.

Chair Adapter Installation

Mounting
Leveling set
bolt and
screw holes (3)
washer
1. Plug in chair to mains power.
2. Raise the chair base and back to full up position.
3. Unplug the chair from the mains power.
NOTE: Skip steps 4-7 if chair adapter is already installed.
Slide washer over lip of chair
5. Slide lip of the washer onto lip of the chair.
 USA
6. Install the 15/16" mounting bolt loosely into
the back of the mount and into the chair.
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
Pivot Chair Adapter, Delivery
& Light Installation Instruction
Lip of chair
4. Position the chair adapter so that the lip of the chair rests
underneath the lip of the washer. The mount will hold
itself in place.
Underside of
Chair adapter
chair adapter
installed
Leveling
set
screws
(3)
7. Place a level on the chair adapter, parallel with and perpendicular to the chair center line.
8. Verify the chair adapter is level.
NOTE: If leveling is necessary, adjust the 3/16" set screws (3) until the unit chair adapter is level.
9. Tighten 15/16" mounting bolt (55 foot-pounds).
NOTE: Verify steps 7, 8 and 9 after unit and light are installed. Re-level if necessary.
Mounting
bolt
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