3-5-2 Exhaust Blower Drive
Removal, Repair and Replacement. See figure 3-25.
This procedure assumes a complete removal, repair and replacement of the assembly. A partial disassembly repair and
replacement is possible. Follow the procedure to the point of removing only those components requiring repair or
Disconnect and lock out the breaker for the exhaust blower drive motor.
Removal the two piece drive guard on the belt drive.
Remove the junction box cover on the electrical motor. Label the electrical wires and disconnect the three power
wires and the ground. Disconnect the ground strap from the electric motor to the frame.
Loosen the four bolts holding the electric motor to the mount. Adjust the motor mount take up until there is slack
in the drive belts.
Remove the belts.
Remove the sheaves following the instructions in Section 3-5-14.
Remove the four bolts holding the electric motor. Remove the electric motor.
Inspect all components that have been removed for wear or damage.
Inspect the drive belts and replace the complete set if any belt is found to be damaged or broken. Check the
length of each belt in the set to determine if they are identical. Replace the belts with a matched set if one belt is
found to have a different length than the others.
Inspect the sheaves for wear or damage. Replace either or both of them if the damage cannot be repaired.
Have the electric motor inspected and tested by a qualified facility. Repair or replace as necessary.
Bolt the electric motor into place on the frame leaving the nuts hand tight. The