LiftMaster SW420 SW420 S3 BOARD Manual - Page 26

26 Required Maintenance Required Maintenance Normal Usage ITEM Internal speed sensor External safety systems Gate caution signs Sprockets & pulleys Gate Accessories Electrical Frame bolts Total unit ACTION Check for proper operation Check at least once every (#) of months 1 3 6 12 >Complete Checkout < Check for proper operation Make sure they are present Check for set screw tightness Inspect for wear or damage Check all for proper operation Inspect all wire connections Check for tightness Inspect for wear or damage Table 6 CAUTION When servicing, always disconnect operator from electrical power supply. NOTES Severe or high cycle usage will require more frequent maintenance checks. Inspection and service should always be performed anytime a malfunction is observed or suspected. 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 if needed. It is suggested to take some voltage readings of the operator while at the site. Using a VOM, double check the incoming voltage to the operator to make sure it is within ten percent of the operator's rating. While you are at the site, now would be a good time to let the owner or manager know about any new items available or any safety items that could and should be added to the site. Doc 01-G0610 Rev A