Walker DB6680, SB6670, DB6660 Replace Reduction Chain, Two-Stage Snowblower Reduction Sprocket

Maintenance Instructions REPLACING/REPAIRING

Master Link

Plate

Open End

of Clip

Closed End

of Clip

Replace Reduction Chain

6.Adjust the chain tension. Refer to ADJUST- MENTS of Two-Stage Snowblower Reduc- tion Chain Tension in this section.

7.Reinstall the reduction box cover by reversing the removal procedures.

Two-Stage Snowblower Reduction Sprocket

A sprocket should be replaced when the teeth be- come asymmetric (when the front of a tooth is a dif- ferent shape than the back side of the tooth).

Symmetric (Acceptable)

Asymmetric (Replace)

Reduction Sprocket Wear

NOTE: Generally, a small sprocket wears faster than a large sprocket.

1.Remove the reduction box cover and reduction chain. Refer to REPLACING/REPAIRING of Two-Stage Snowblower Reduction Chain in this section.

2.Loosen the set screws that fasten the sprocket to the fan assembly by applying heat to the thread sealant used on these screws during as- sembly.

3.Slide the sprocket off the fan assembly. Use a puller if necessary.

4.Position the new sprocket on the fan assembly. Apply Loctite® Threadlocker to set screws be- fore tightening.

Roll Pin

Set

Screw

Drive Shaft

Sprocket

Set Screw

Locking Collar

Remove and Replace Sprocket

5.Install chain and adjust the chain tension. Refer to ADJUSTMENTS of Two-Stage Snowblow- er Reduction Chain Tension in this section.

6.Lubricate the reduction chain. Refer to LUBRI- CATION of Two-Stage Snowblower Reduc- tion Chain in this section.

7.Reinstall the reduction box cover by reversing the removal procedures.

Debris Blower Drive Belt

1.Remove the belt guard from the debris blower housing by removing the two (2) cover pins and hairpins securing it to the housing.

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