Difficulty

Moderate

Steps

31

Time Required

                          45 minutes - 1 hour

Sections

3

  • Safety Precautions
  • 4 steps
  • Belts
  • 19 steps
  • Arbor Shaft Bearings
  • 8 steps

Flags

0

  • BackEDCO PRO Walk Behind Concrete Saw 18" KL-18

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Introduction

What you need

Step 1

              Chock the wheels
  • Before you begin, ensure the machine is powered down and cool to the touch.
  • Chock the wheels to prevent the machine from moving while you are working on it.

Before you begin, ensure the machine is powered down and cool to the touch.

Chock the wheels to prevent the machine from moving while you are working on it.

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Step 2

              Turn off the ignition switches
  • Flip the ignition switches on the motor and the handle bar into their “OFF” positions.

Flip the ignition switches on the motor and the handle bar into their “OFF” positions.

Step 3

              Close the fuel valve
  • Flip the fuel cutoff valve switch into the off position.

Flip the fuel cutoff valve switch into the off position.

Step 4

              Disconnect the spark plug
  • Grab the plastic housing at the end of the spark plug wire.
  • Pull firmly to disconnect the wire from the spark plug.

Grab the plastic housing at the end of the spark plug wire.

Pull firmly to disconnect the wire from the spark plug.

Step 5

              Remove the belt guard
  • Use a 9/16 inch socket to remove the two bolts securing the belt guard to the main frame.

Use a 9/16 inch socket to remove the two bolts securing the belt guard to the main frame.

Step 6

  • Remove the belt guard.

Remove the belt guard.

Step 7

              Loosen the belt-tensioner lock nut
  • Use a 9/16 inch wrench to loosen the lock nut on the belt-tensioner bolt.

Use a 9/16 inch wrench to loosen the lock nut on the belt-tensioner bolt.

Step 8

  • Use your finger to spin the lock nut counterclockwise until there is a about a one inch gap between it and the frame.
  • Wrap a piece of tape around the belt-tensioner bolt where it meets the frame.
  • During reassembly, tighten the belt-tensioner bolt until the tape is flush against the frame (or until the belt is sufficiently tensioned) and then tighten down the belt-tensioner lock nut to the frame.

Use your finger to spin the lock nut counterclockwise until there is a about a one inch gap between it and the frame.

Wrap a piece of tape around the belt-tensioner bolt where it meets the frame.

During reassembly, tighten the belt-tensioner bolt until the tape is flush against the frame (or until the belt is sufficiently tensioned) and then tighten down the belt-tensioner lock nut to the frame.

Step 9

              Remove the belt-tensioner bolt
  • Use a 9/16 inch socket to remove the belt-tensioner bolt from the frame.

Use a 9/16 inch socket to remove the belt-tensioner bolt from the frame.

Step 10

              Disconnect the ground wire
  • Use a 9/16 inch wrench to remove the nut securing the ground wire to the engine block.

Use a 9/16 inch wrench to remove the nut securing the ground wire to the engine block.

Step 11

  • Remove the ground wire and tooth washer from the engine mount.

Remove the ground wire and tooth washer from the engine mount.

Step 12

              Relieve tension on the bolts
  • Use a 9/16 inch wrench to loosen the four nuts securing the engine block to the frame, two on the front and two on the back.
  • Do not completely remove these nuts.

Use a 9/16 inch wrench to loosen the four nuts securing the engine block to the frame, two on the front and two on the back.

Do not completely remove these nuts.

Step 13

  • Slide the engine towards the front of the frame to relieve tension on the belts.
  • To keep the motor in the de-tensioned position, tighten a couple of the nuts down.

Slide the engine towards the front of the frame to relieve tension on the belts.

To keep the motor in the de-tensioned position, tighten a couple of the nuts down.

Step 14

              Remove the belts from the motor pulley
  • Lift the outermost belt out of its pulley groove and rotate the motor pulley to remove it.
  • Repeat for the two remaining belts.

Lift the outermost belt out of its pulley groove and rotate the motor pulley to remove it.

Repeat for the two remaining belts.

Step 15

              Remove the cutter blade
  • Place the guide bar onto the ground out of the way of the blade guard.

Place the guide bar onto the ground out of the way of the blade guard.

Step 16

  • Lift the blade guide straight up and off of the frame and place it next to the machine.
  • The blade guard is still attached to the device via the water hose.

Lift the blade guide straight up and off of the frame and place it next to the machine.

The blade guard is still attached to the device via the water hose.

Step 17

  • When working with the blade, wear gloves. The edges of the blade are sharp. Be careful not to cut your arms on the blade.
  • Use the two included 1-1/2 inch wrenches to twist the arbor shaft nut counterclockwise while holding the backing plate in place.

When working with the blade, wear gloves. The edges of the blade are sharp. Be careful not to cut your arms on the blade.

Use the two included 1-1/2 inch wrenches to twist the arbor shaft nut counterclockwise while holding the backing plate in place.

Step 18

  • Remove the arbor shaft nut, lock washer, and blade cap from the arbor shaft.

Remove the arbor shaft nut, lock washer, and blade cap from the arbor shaft.

Step 19

  • Remove the blade.

Remove the blade.

Step 20

              Remove the arbor shaft
  • Lift the guide bar back up off the ground into its vertical position.

Lift the guide bar back up off the ground into its vertical position.

Step 21

  • Use a 9/16 inch socket to remove the four bolts securing the arbor shaft bearings to the frame.
  • If necessary, have a second person hold the arbor shaft to prevent it from hitting the ground.

Use a 9/16 inch socket to remove the four bolts securing the arbor shaft bearings to the frame.

If necessary, have a second person hold the arbor shaft to prevent it from hitting the ground.

Step 22

  • Remove the arbor shaft.

Remove the arbor shaft.

Step 23

              Remove the belts
  • Remove the belts from the arbor shaft pulley.

Remove the belts from the arbor shaft pulley.

Step 24

              Mark the pulley location
  • Use a pen to mark the location of the pulley on the arbor shaft.
  • During reassembly, line the pulley up with this marking to ensure the belts are straight.

Use a pen to mark the location of the pulley on the arbor shaft.

During reassembly, line the pulley up with this marking to ensure the belts are straight.

Step 25

              Remove the arbor shaft pulley
  • Use a 5/32 inch hex key to loosen the two arbor shaft pulley set screws.
  • The set screws do not need to be completely removed.

Use a 5/32 inch hex key to loosen the two arbor shaft pulley set screws.

The set screws do not need to be completely removed.

Step 26

  • Remove the arbor shaft pulley.
  • Remove the shaft key.

Remove the arbor shaft pulley.

Remove the shaft key.

Step 27

              Mark the bearing locations
  • Use a pen to mark the locations of both of the arbor shaft pulleys.
  • During reassembly, slide the new bearings up to these marks to ensure they align with the mounting locations on the frame.

Use a pen to mark the locations of both of the arbor shaft pulleys.

During reassembly, slide the new bearings up to these marks to ensure they align with the mounting locations on the frame.

Step 28

              Remove the left arbor shaft bearing
  • Use a 1/8 inch hex key to loosen the two set screws on the arbor shaft bearing opposite the backing plate.
  • During reassembly, do not tighten these set screws until the bearings have been secured to the frame to ensure proper alignment.

Use a 1/8 inch hex key to loosen the two set screws on the arbor shaft bearing opposite the backing plate.

During reassembly, do not tighten these set screws until the bearings have been secured to the frame to ensure proper alignment.

Step 29

  • Remove the left arbor shaft bearing.

Remove the left arbor shaft bearing.

Step 30

              Remove the right arbor shaft bearing
  • Use a 1/8 inch hex key to loosen the two set screws on the arbor shaft bearing next to the blade backing plate.
  • During reassembly, do not tighten these set screws until the bearings have been secured to the frame to ensure proper alignment.

Use a 1/8 inch hex key to loosen the two set screws on the arbor shaft bearing next to the blade backing plate.

Step 31

  • Remove the right arbor shaft bearing.

Remove the right arbor shaft bearing.

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

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Author

                    Sam Omiotek

Member since: 02/25/2019

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