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はじめに

Follow this guide to replace the head assembly on a EDCO Disk Grinder model 50200-HD.

This repair requires two people.

  1. Before you begin, ensure the device is powered down and cool to the touch.
    • Before you begin, ensure the device is powered down and cool to the touch.

    • Ensure the machine is unplugged.

    • Turn the power switch counterclockwise into the OFF position.

  2. Use a 9/16 inch socket to remove the two bolts securing the weighted hood. During reassembly, ensure the bolts are reinstalled with the washers and lock washers in the correct order. During reassembly, ensure the bolts are reinstalled with the washers and lock washers in the correct order.
    • Use a 9/16 inch socket to remove the two bolts securing the weighted hood.

    • During reassembly, ensure the bolts are reinstalled with the washers and lock washers in the correct order.

  3. Remove the weighted hood. The weighted hood weighs 37 pounds. Wear gloves and handle with caution. The weighted hood weighs 37 pounds. Wear gloves and handle with caution.
    • Remove the weighted hood.

    • The weighted hood weighs 37 pounds. Wear gloves and handle with caution.

  4. Use a 9/16 inch socket to loosen the bolts securing the motor mount. Do not completely remove the bolts.
    • Use a 9/16 inch socket to loosen the bolts securing the motor mount.

    • Do not completely remove the bolts.

  5. Slide the motor towards the front of the machine as far as it will go to loosen the belt tension. Use a 9/16 inch socket to tighten the four bolts back down to lock the motor in a position where there's the least belt tension.
    • Slide the motor towards the front of the machine as far as it will go to loosen the belt tension.

    • Use a 9/16 inch socket to tighten the four bolts back down to lock the motor in a position where there's the least belt tension.

    • During reassembly, have one person slide the motor mount towards the rear of the machine to tension the belt while the other person tightens the bolts.

  6. Tilt the front of the machine up and rest the handlebars on the ground. Have someone hold down the handlebars to prevent tipping while working on the belt. Have someone hold down the handlebars to prevent tipping while working on the belt.
    • Tilt the front of the machine up and rest the handlebars on the ground.

    • Have someone hold down the handlebars to prevent tipping while working on the belt.

  7. Pinch a flathead screwdriver between the belt and sheave. Rotate the sheave and pivot the belt up and away from its groove. Rotate the sheave and pivot the belt up and away from its groove.
    • Pinch a flathead screwdriver between the belt and sheave.

    • Rotate the sheave and pivot the belt up and away from its groove.

  8. Continue to rotate the sheave with once hand while holding the flathead screwdriver with the other to fully dislodge the belt from the groove. Continue to rotate the sheave with once hand while holding the flathead screwdriver with the other to fully dislodge the belt from the groove.
    • Continue to rotate the sheave with once hand while holding the flathead screwdriver with the other to fully dislodge the belt from the groove.

  9. Remove the belt from the motor pulley, then fully remove it from the machine. Reassembly tip: loop the belt around the motor pulley before placing it on the sheave. Reassembly tip: loop the belt around the motor pulley before placing it on the sheave.
    • Remove the belt from the motor pulley, then fully remove it from the machine.

    • Reassembly tip: loop the belt around the motor pulley before placing it on the sheave.

  10. Reassembly tip: place the belt over the rim and rotate the sheave to guide the belt into the groove. Reassembly tip: place the belt over the rim and rotate the sheave to guide the belt into the groove. Reassembly tip: place the belt over the rim and rotate the sheave to guide the belt into the groove.
    • Reassembly tip: place the belt over the rim and rotate the sheave to guide the belt into the groove.

  11. Remove the rubber skirt surrounding the disk head. Remove the rubber skirt surrounding the disk head. Remove the rubber skirt surrounding the disk head.
    • Remove the rubber skirt surrounding the disk head.

  12. Tilt the machine back into working position. Tilt the machine back into working position. Tilt the machine back into working position.
    • Tilt the machine back into working position.

  13. Use a 5/32 inch hex wrench to loosen the set screw securing the sheave to the head assembly shaft.
    • Use a 5/32 inch hex wrench to loosen the set screw securing the sheave to the head assembly shaft.

    • If the set screw is seized, use an impact driver with a 5/32 inch hex socket to loosen it.

  14. Lift the sheave straight up off of the head assembly shaft. Lift the sheave straight up off of the head assembly shaft. Lift the sheave straight up off of the head assembly shaft.
    • Lift the sheave straight up off of the head assembly shaft.

  15. Remove the key from the head assembly shaft.
    • Remove the key from the head assembly shaft.

  16. Use a 5/32 inch hex bit with an extension to loosen the two set screws securing the head assembly shaft to the upper bearing. Use a 5/32 inch hex bit with an extension to loosen the two set screws securing the head assembly shaft to the upper bearing.
    • Use a 5/32 inch hex bit with an extension to loosen the two set screws securing the head assembly shaft to the upper bearing.

  17. Use a 5/32 inch hex bit with an extension to loosen the two set screws securing the head assembly shaft to the lower bearing. The set screws can be accessed through the opening in the shroud on the front of the machine.
    • Use a 5/32 inch hex bit with an extension to loosen the two set screws securing the head assembly shaft to the lower bearing.

    • The set screws can be accessed through the opening in the shroud on the front of the machine.

  18. Tilt the front of the machine up off the ground. Have someone hold down the handlebars to prevent tipping while working on the head assembly. Have someone hold down the handlebars to prevent tipping while working on the head assembly.
    • Tilt the front of the machine up off the ground.

    • Have someone hold down the handlebars to prevent tipping while working on the head assembly.

  19. Use a 7/32 inch hex key to remove the four flat screws securing the disk to the head assembly.
    • Use a 7/32 inch hex key to remove the four flat screws securing the disk to the head assembly.

  20. Wear gloves. The edges of the disk can be sharp. Remove the disk.
    • Wear gloves. The edges of the disk can be sharp.

    • Remove the disk.

  21. Use a dead blow hammer to hit the head assembly shaft straight down until it is flush with the upper bearing bracket, or as far as it will go. Use a dead blow hammer to hit the head assembly shaft straight down until it is flush with the upper bearing bracket, or as far as it will go. Use a dead blow hammer to hit the head assembly shaft straight down until it is flush with the upper bearing bracket, or as far as it will go.
    • Use a dead blow hammer to hit the head assembly shaft straight down until it is flush with the upper bearing bracket, or as far as it will go.

  22. Use an appropriately-sized punch to knock the head assembly the rest of the way out. Once the head assembly shaft clears the last bearing, it will fall out. If necessary, have someone hold it to prevent it from hitting the ground.
    • Use an appropriately-sized punch to knock the head assembly the rest of the way out.

    • Once the head assembly shaft clears the last bearing, it will fall out. If necessary, have someone hold it to prevent it from hitting the ground.

  23. Remove the head assembly. Remove the head assembly.
    • Remove the head assembly.

  24. During reassembly: Insert the new head assembly up into the bearing as far as you can by hand. Use a dead blow hammer to knock the head assembly up into the machine until there is no play in the shaft spacer.
    • During reassembly:

    • Insert the new head assembly up into the bearing as far as you can by hand.

    • Use a dead blow hammer to knock the head assembly up into the machine until there is no play in the shaft spacer.

    • Ensure there is no play in the shaft spacer before tightening the set screws onto the new head assembly.

終わりに

To reassemble your device, follow these instructions in reverse order.

Sam Omiotek

メンバー登録日: 2019年02月25日

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