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

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Maintenance Instructions

REPLACING/REPAIRING

Reversible

Cutting Edge

Snowblower Cutting Edge Replacement

Two-Stage Snowblower Gearbox

Remove and replace the gearbox as follows:

1.Stop the tractor engine, set the parking brake, and remove the ignition key.

Auger Shear	Support	Pinion
Bolt	Bracket	Shaft

						Bolt



								Collar
								Bearing
								Screw


Auger
Auger				Gearbox
				Gearbox


		Shaft
	Assembly
	Assembly				Bearing Flange Bolt
					Bearing Flange Bolt

Replace Snowblower Gearbox

2.Remove the three (3) 5/16 nuts and the three

(3) 5/16 x 3/4 bolts holding the bearing flanges on each end of the snowblower. Loosen the (2) two set screws on each collar bearing.

3.Remove the 5/16 nut and the 5/16 x 2 hex pin- ion shaft bolt.

4.Remove the two (2) 5/16-NC nylon locknuts and the two (2) 5/16-NC x 1-1/4 in. hex bolts fasten- ing the support bracket and gearbox to the snowblower frame.

5.Hold and move the gearbox/auger assembly to the left and the right side will slide out. Slide the left side out.

6.Remove the two (2) 5/16-18 auger shear bolts and two (2) 5/16 nuts. Remove augers from gearbox/shaft assembly.

7.Replace the gearbox by reversing the removal procedures.

Two-Stage Snowblower Reduction Chain

The reduction chain should be replaced if, when ad- justed properly, it can be pulled away from the front of the reduction sprocket more than 1/2 the height of a tooth on the sprocket. Running the snow- blower with a worn chain increases wear on the sprockets.

1.Remove the 1/4 x 7-1/2 in. bolt, lock washer, and nut from the reduction box cover.

2.Remove the box cover from the reduction box.

Reduction

Chain

Remove Reduction Box Cover

3.Turn the reduction box drive shaft until the mas- ter link for the chain is accessible.

4.Remove the master link from the chain and re- move the chain from the sprocket.

5.Place the new chain on the sprockets and install the master link. Install the clip on the master link properly. The closed end of the clip should point in the direction of chain travel.

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Contents Illustrated Parts Manual Foreword Table of Contents Maintenance Schedule Chart Torque SpecificationsImplement Hitch Assembly Electrical Components KEY to Abbreviations Used in Illustrated Parts ListGeneral Information GlossaryIdentifying Number Locations Fill In By PurchaserSerial Number Serial Number Rotary Broom Serial Number LocationUnit Descriptions Specifications Implement HitchDozer Blade Rotary BroomTWO-STAGE Snowblower Debris Blower Implement Hitch Top View Not Installed Component IdentificationDozer Blade Rear View and Right Side View Not Installed Rotary Broom Rear View and Right Side View Not Installed TWO-STAGE Snowblower Two-Stage Snowblower Rear View Not Installed Debris Blower Front View and Left Side View Not Installed Debris Blower Rear View and Right Side View Not Installed Safety Instructions Before OperatingDo not operate with bystanders in the area Operating Maintenance SAFETY, CONTROL, and Instruction Decals PTO Shield Walker P/N Attaching Hitch Hitch Mount AdjustSAFETY, CONTROL, and Instruction Decals Assembly Instructions Setup InstructionsImplement Hitch Installation Implement Hitch Jam Nut AdjustmentDrill Holes for Implement Hitch Wiring Attach Toggle Switch Mounting BracketAttach Wiring Harness and Toggle Switch Connect Harness Wire to Circuit BreakerComplete Implement Hitch Wiring Implement Hitch Wiring Diagram Attach Spring to Blade Assembly Insert Adjustment Pin and Set Blade AngleInsert Female Hitch into Blade Attachment Install Skid Shoes Rotary Boom InstallationAttach Blade to Tractor Prepare Rotary Broom for Installation Assemble Rotary Broom DrivelineAttach Broom to Implement Hitch Connect Broom Driveline to Tractor PTO ShaftAdjust Brush to Ground Contact Lock Stopper Pin in PlaceGHS Blower Intake Cover Install Hand Guard on Chute Install Plastic Insert over Chute Base LipInstall Rotation Worm Assembly Install Chute over Plastic InsertInstall Skid Shoes Snowblower Installation Install Bolt in Reduction Box Install Reduction Box CoverAttach Drive Shaft Yoke to Reduction Shaft Mount Female Hitch to SnowblowerAttach Snowblower to Implement Hitch Connect Driveline Coupler to Tractor PTOAttach Parallel Bar to Female Hitch Insert Rotation Handle into Rotation WormAttach Tractor PTO to Debris Blower Input Shaft Attach Debris Blower to Implement HitchRefer to Angle Adjustment Pin in Operating Refer to Hitch Locking Lever in Operating InstrucRefer to Angle Adjustment Lever in Operating Refer to Ground Contact Knob in OperatingOperating Instructions TWO-STAGE Snowblower ControlsTWO-STAGE Snowblower Operation Engaging the Snowblower PTO Clutch EngagedThrow Snow to Both Sides Clogging Checklist Throw Snow to One SideRaising and Lowering the Debris Blower Engaging the Debris Blower Stopping the MachineMaintenance Instructions Maintenance procedures requiring special training orModel Service Item Daily Hours Tools should be performed by a trained technicianLubrication Rotary Broom GearboxRotary Broom Gearbox with Cover Removed Remove Chain Guard CoverSnowblower Lubricant Plug Location Two-Stage Snowblower Reduction ChainRemove Reduction Box Cover Grease Fitting and Oil Point LubricationLubrication Implement Hitch Lubrication Points Angle Adjustment Pin Oil Dozer Blade Lubrication Points Ident Rotary Broom Lubrication Points Location Type Two-Stage Snowblower Lubrication Points Ident Lubrication Location Type Debris Blower Lubrication Points REPLACING/REPAIRING Dozer Blade Cutting Edge Replacement Rotary Broom BrushSupport Rear of Broom Housing Remove Brush from Broom Housing Loosen Chain Idler and Set ScrewsReplace Rotary Broom Gearbox Rotary Broom Drive Chain Remove Chain Guard Loosen Chain Tension Replace Drive ChainRotary Broom Drive Sprocket Sprocket WearCheck Sprocket Alignment with Chain Installed Remove and Replace SprocketAlign Sprockets Replace Snowblower Gearbox Replace Reduction Chain Two-Stage Snowblower Reduction SprocketReduction Sprocket Wear Debris Blower Drive BeltAdjustments Dozer Blade Skid ShoesSkid Shoe Height Adjustment Rotary Broom Brush Leveling Side to Side Level Adjustment Rotary Broom Gauge WheelsGauge Wheel Height Adjustment Loosen Chain Idler Nut Proper Drive Chain Tension Two-Stage Snowblower Skid ShoesAnce under the blade. On level, paved surfaces Surface. On uneven or gravel surfaces, allow 1/2Proper Drive Belt Deflection Drive Belt Tension Adjustment Debris Blower Rotation Pinions Debris Blower Rotation Pinions Handle AdjustmentTorque Specifications Removal and Storage Instructions RemovalDetach Blade from Implement Hitch Detach Rotary Broom from Implement Hitch Detach Snowblower from Implement HitchDetach Implement Hitch from Tractor END of Season StorageRotary Broom Implement Hitch Assembly FastenersUse only genuine Walker replacement parts Implement Hitch Electrical Components Implement Hitch Electrical Components FastenersRAD Technologies Inc Implement Hitch Electrical Components Dozer Blade Assembly Dozer Blade Assembly Rotary Broom Assembly Rotary Broom AssemblyKit I391 Side Caster Wheels Kit Rotary Broom Assembly Gearbox Assembly Driveline and Sprockets Assembly FastenersRotary Broom Drive Components Rotary Broom Drive Components Snowblower Housing Components Chute Rotation AssemblySnowblower Mount Assembly Reduction Box AssemblySnowblower Housing Components Snowblower Drive Components Driveline and Auger ComponentsSnowblower Drive Components Debris Blower Components Debris Blower ComponentsDebris Blower Components Debris Blower Manual Rotation Components Debris Blower Manual Rotation ComponentsDebris Blower Manual Rotation Components KEY to Abbreviations Used in Illustrated Parts Manual Limited Warranty For Walker Commercial Rider Mower Walker MFG. CO E. Harmony ROAD, Fort COLLINS, CO 80528 970