Operator Maintenance - Chamberlain LiftMaster Professional SW420 Manual

DESCRIPTION
Internal speed sensor
External entrapment
protection systems
Gate caution signs
Manual disconnect
Drive chain
Sprockets & Pulleys
Gate
Accessories
Electrical
Frame bolts
Total unit
All power must be disconnected from operator before maintenance can be performed.
All maintenance must be done by a LiftMaster dealer.
NOTES:
1. Severe or high cycle usage will require more frequent maintenance checks.
2. Inspection and service should always be performed anytime a malfunction is observed or suspected.
3. When servicing, please do some "house cleaning" of the operator and the area around the operator. Pick up any debris in the area. Clean the
operator as needed.
4. It is suggested that while at the site voltage readings be taken at the operator. Using a Digital Voltmeter, verify that the incoming voltage to the
operator is within ten percent of the operators rating.
O P E R A T O R M A I N T E N A N C E
TASK
Check for proper operation
Check for proper operation
Make sure they are present
Check and operate
Check for excessive slack & lubricate
Check for excessive slack & lubricate
Inspect for wear or damage
Check all for proper operation
Inspect all wire connections
Check for tightness
Inspect for wear or damage
CHECK AT LEAST ONCE EVERY
3 MONTHS
28
6 MONTHS 12 MONTHS