Rev C Doc 6001194 (01-20259) 25 of 36
D. MAINTENANCE
WARNING
To avoid injury, always turn off the unit power switch before working on gate.
Regularly performance of preventive maintenance is essential for reliable system operation
because it corrects small problems before they turn into emergencies. LiftMaster recommends
performing preventive maintenance every 6 to 12 months, depending upon the amount of gate
usage.
• If the gate is installed in a private residence or small apartment house where usage is not
severe, yearly preventive maintenance is acceptable
• If the gate is installed in a high-traffic application, semi-annual preventive maintenance is
essential.
PREVENTIVE MAINTENANCE TASKS
1. Gate: must roll freely without any impediment. Check wheels, grease if necessary.
2. Chain: Check for wear and tension. If loose, adjust chain tension. Do not oil chain.
3. Sprocket: must not be loose on the shaft. Tighten set screws if loose ➊.
4. Idlers: Check for wear. Tighten bolts if loose. Do not oil idler assembly.
5. Limit switches: contacts must bounce back rapidly when they are pressed and released.
Cam lock plate (see Figure 14) must firmly hold the cams. Do not oil gearbox shaft.
6. Belt: Check for wear and tension (25 to 30 lb.). Adjust the AC motor up or down to set
proper tension.
7. Pulleys: must all line up and be firmly secured to their shafts. Tighten set screws if loose ➊.
8. Gear Box: Check for no oil leakage around the bushings. Do not oil gearbox.
9. Control board: Check for water damage or burned spots. All connectors secured to the
board.
10. Wiring: Check all wirings for any insulation damage. Check for loose wire connections.
11. No Rust: Check for rust throughout the unit. Check corners for water entrapment.
12. Fire Open: Activate Fire department switch to verify emergency gate opening.
13. Gate Sense: Check for the gate sensitivity (refer to Part 2, System Installation, paragraph H,
Gate Sensitivity Adjustments).
14. Power Fail Option (PFO): Check for proper operation (refer to Part 2, System Installation,
paragraph J, Power Fail Option Connection, item B, Power Fail Option Operation Test).
NOTES:
➊: To prevent loosening, LOCTITE threadlocker 242 is applied to set screws.