Chamberlain MADCBB - Manual (Page 16)

16
OPERATION AND MAINTENANCE »
GENERAL SERVICE + SHEAR PIN REPLACEMENT + BATTERY
To avoid SERIOUS PERSONAL INJURY or DEATH from electrocution, disconnect ALL electric power BEFORE performing ANY maintenance.
Check at the intervals listed in the following chart:
GENERAL SERVICE
• If the belt is loose or needs replacement, adjust with 4 bolts that support motor
to allow 1/4" play.
• Battery voltage should be 27.5 +0.05, -0 Vdc disconnected (set with R63,
shown on the Control Board Layout page ).
 Repeat ALL procedures.
1. Turn the S3 Manual Open switch to OPEN on the control board to rotate gate
arm bracket to the up position.
2. Disconnect AC power and disconnect batteries.
3. Remove the gate arm bracket and pieces in collar.
4. Drive out pin pieces with hammer and punch (Solid sharp blows are better than
light ones).
5. Reinstall gate arm bracket.
6. Lightly oil the new pin and insert into collar.
7. Fully seat pin in shaft by tapping on large end.
8. Reinstall the barrier arm if required.
9. Connect AC power and batteries.
10. Turn off S3 Manual Open switch to CLOSE to put gate into operation.
SHEAR PIN REPLACEMENT
If gate arm is vandalized and the tapered pin in the output shaft has been sheared, it must be replaced correctly and with the right pin type. Replacement must be done by
always punching out the pin (or pieces) from the small end only. If drilling is required, DO NOT DAMAGE THE SHAFT, use a drill bit smaller than the small hole size of the pin.
(Correct pin (P/N MA013) is a 2" pin with a number 6 taper only.)
NEVER USE A BOLT AS A TEMPORARY FIX, THIS WILL DAMAGE THE SHAFT AND COLLAR.
BATTERY
BATTERY DISPOSAL
Replaced batteries must be treated as a hazardous waste and disposed of in
accordance with State, Local and Federal Regulations. See the battery manufacturer’s
Material Safety Data Sheets (01-30839 “MSDS Sheets, Battery, Standard”).
BATTERY REPLACEMENT
Service Kits are available for battery replacement. Please contact Technical Support
(see back of this document for contact information). Replace the batteries with
LiftMaster P/N MBAT batteries. Replace in pairs.
BATTERY MAINTENANCE / TESTING
The batteries are maintenance free. However, to ensure proper and safe operation, it is
recommended that the batteries be replaced every two years. Battery testing is
conducted automatically. See the Battery Test Description section for manually
initiating the battery test.
BATTERY HANDLING / STORAGE
Refer to the battery manufacturer’s Material Safety Data Sheets (01-30839 “MSDS
Sheets, Battery, Standard”). LiftMaster does not recommend storage of batteries in
the field. Batteries are intended for immediate use.
(Operator)
Gate Arm Bracket
Barrier Arm
Shear Pin
Collar
ITEM PROCEDURE EVERY 3 MONTHS EVERY 6 MONTHS EVERY 12 MONTHS EVERY 24 MONTHS
Fasteners Check and tighten as required z ◆
Bearings and Shafts Check for wear and lubricate z ◆
Battery Maintenance Replace batteries. ◆ z