General Maintenance and Troubleshooting
SM 6495, Rev. 7, December 2008 3-11
6. Toggle the maintenance switch to the NORMAL position.
7. Tighten the gold nut on Terminal 5B.
3.2.9.2. Maintenance Switch Not Installed
If it becomes necessary to replace the gate arm on the mechanism, the following procedures may be
used. (For models with maintenance switch, see Section 3.2.9.1).
1. Remove red motor lead from terminal T4.
2. Loosen the gold nut on terminal 5B (refer to
Figure 2-2, Figure 2-3, Figure 2-4, and Figure 2-5 for
terminal locations).
3. Temporarily connect a jumper from terminal 6B on the terminal board to red motor lead.
4. Connect another jumper from terminal 2C on the terminal board to T5 of the terminal strip (T5
usually has a black wire connected to it).
5. Allow the support arm to drive down. Immediately insert the provided hold down pin into an
appropriate opening in the large idler gear.
CAUTION
Remove jumpers quickly after pinning the gear. With the jumpers
installed the motor will be in a stalled condition which may potentially
cause damage to the motor.
6. Remove the jumper wires connected to terminal 2C and 6B on the terminal board.
7. Replace the gate arm.
8. Remove hold down pin.
9. Reconnect red motor lead to terminal T4 and tighten gold nut on 5B.
3.2.10. Eliminating Brush Dust Related System Grounds in the Gearmotor
"Dust and dirt may collect in the gearmotor and create a ground on the system. These grounds can be
removed as follows:
1. Remove the gearmotor from the gate mechanism per Section 3.2.6.
2. Disassemble the gearmotor completely, clean the gearmotor thoroughly per standard motor
cleaning processes, and reassemble the gearmotor.
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