General Maintenance and Troubleshooting
SM 6495, Rev. 7, December 2008 3-7
If necessary, the air gap may be adjusted as low as 0.015” and as high as 0.025” to obtain the proper
pick-up and drop-away values.
3.2.6. Gearmotor
The gearmotor (see Figure 5-1, Figure 5-3, or Figure 5-7, Item 40) is a contained unit with a special gel
lubricant sealed in the gearbox. Should the gearmotor become faulty, it is recommended that the entire
unit be replaced. The hold clear device is attached to the gearmotor at the bottom of the gate
mechanism.
1. Disconnect (white) brake wires from contacts labeled 1B and 4B on 12-volt systems and 2B and
4B on 24-volt systems.
WARNING
To avoid bodily injury, remove power from the gate mechanism before
attempting to remove or replace the gearmotor. The following steps
MUST be taken:
1. Position the gate arm of the Mechanism being serviced in the
desired position (See Section 3.2.9),
2. Electrically disconnect the Mechanism being serviced by
loosening the gold nut on Terminal 5B, and
3. Remove and insulate the B12 (or B24) supply wire from
Terminal 2C.
2. Disconnect (red and black) power wires from contacts labeled T4 and T5. (For models with
maintenance switch, contacts are labeled T6 and T7.)
3. Remove screws from the limit resistor. Temporarily move limit resistor to the side to clear
gearmotor when removing.
4. Remove pinion gear on output shaft of gearmotor.
NOTE
Place your hand under the gearmotor to secure it before removing the
last bolt.
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