To Open The Door Manual; Care Of Your Opener - Chamberlain POWER DRIVE PD300 Manual

Operation
To Open the Door Manually
To prevent possible SERIOUS INJURY or DEATH from a falling garage door:
• If possible, use emergency release handle to disengage trolley ONLY when garage door is
CLOSED. Weak or broken springs or unbalanced door could result in an open door falling
rapidly and/or unexpectedly.
• NEVER use emergency release handle unless garage doorway is clear of persons and
obstructions.
• NEVER use handle to pull door open or closed. If rope knot becomes untied, you could fall.
DISCONNECT THE TROLLEY
1. The door should be fully closed if possible.
2. Pull down on the emergency release handle so the trolley release arm snaps to the vertical
position. The door can now be raised and lowered as often as necessary.
RECONNECT THE TROLLEY
1. Pull the emergency release handle toward the garage door opener so the trolley release arm
snaps to the horizontal position.
The trolley will reconnect on the next UP or DOWN operation, either manually or by using the
door control or remote control.

Care of Your Opener

LIMIT AND FORCE ADJUSTMENTS
Weather conditions may cause some minor changes in door operation requiring some re-adjustments,
particularly during the first year of operation. Pages 28 and 29 refer to the limit and force adjustments.
Only a screwdriver is required. Follow the instructions carefully. Repeat the safety reverse test
(Adjustment Step 3, page 30) after any adjustment of limits or force.
FORCE CONTROLS
LIMIT CONTROLS
MAINTENANCE SCHEDULE
Every Month
Manually operate door. If it is unbalanced or binding, call a trained door systems technician.
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Check to be sure door opens and closes fully. Adjust limits and/or force if necessary (see
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pages 28 and 29).
Repeat the safety reverse test. Make any necessary adjustments (see Adjustment Step 3).
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Two Times a Year
Check chain tension. Disconnect trolley first. Adjust if necessary (see page 9).
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Every Year
Oil door rollers, bearings and hinges. The opener does not require additional lubrication. Do
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not grease the door tracks.
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