Service

Maintenance, repair, or replacement of the emission control devices and systems on this engine, which are being done at the customers expense, may be performed by any nonroad engine repair establishment or individual. Warranty repairs must be performed by an authorized John Deere dealer.

Avoid Fumes

c CAUTION: Avoid injury! Engine exhaust fumes contain carbon monoxide and can cause serious illness or death.

Move the vehicle to an outside area before running the engine.

DO NOT run an engine in an enclosed area without adequate ventilation.

· Connect a pipe extension to the engine exhaust pipe to direct the exhaust fumes out of the area.

· Allow fresh outside air into the work area to clear the exhaust fumes out.

Grease


IMPORTANT: Avoid damage! Use recommended John Deere greases to avoid component failure and premature wear. The recommended John Deere greases are effective within an average air temperature range of -29 to 135 degrees C (-20 to 275 degrees F). If operating outside that temperature range, contact your Servicing dealer for a special-use grease.

The following greases are preferred:

· John Deere Multi-Purpose SD Polyurea Grease

· John Deere Multi-Purpose HD Lithium Complex Grease

· John Deere Moly High Temperature EP Grease

If not using any of the preferred greases, be sure to use a general all-purpose grease with an NLGI grade No.2 rating.

Wet or high speed conditions may require use of a special-use grease. Contact your Servicing dealer for information.

Engine Oil

Use oil viscosity based on the expected air temperature range during the period between oil changes.

The following John Deere oils are preferred:

M1999061615130

· TURF-GARD®

· PLUS-4®

Other oils may be used if above John Deere oils are not available, provided they meet the following specification:

· API Service Classification SG or higher

Gear Oil

Use oil viscosity based on the expected air temperature range during the period between oil changes.

The following John Deere gear case oil is PREFERRED:

· GL-5 GEAR LUBRICANT®-SAE 80W-90.

The following John Deere gear case oil is also recommended if above preferred oil is not available:

· GL-5 GEAR LUBRICANT®-SAE 85W-140.

Other gear case oils may be used if above recommended John Deere gear case oils are not available, provided they meet the following specification:

· API Service Classification GL-5.

Checking Engine Oil Level

M94189

1. Park snowblower on a level surface.

2. Clean area around dipstick.

3. Remove dipstick (A). Wipe it off with clean, lint free towel.


IMPORTANT: Avoid damage! DO NOT fill above FULL mark (B) on dipstick.

4. Install and tighten dipstick. Remove dipstick and locate oil level.

M71567

5. Add oil to bring level to the FULL mark on dipstick.

· Add oil through dipstick tube.

6. Install and tighten dipstick.

Changing Engine Oil

NOTE: Change oil after first two operating hours.

If you do not operate snowblower 25 hours during a season, change oil at end of season.

M94190

1. Run engine a few minutes to warm oil. Oil will flow more freely and carry away more contamination when warm.

2. Clean area around oil drain plug (A).

3. Position unit so engine oil drain plug is lowest point on engine.

4. Remove oil drain plug (A) and dipstick (B) to drain engine oil.


IMPORTANT: Avoid damage! DO NOT fill above FULL mark (C) on dipstick.

5. Install oil drain plug and tighten.

M94189

6. Add oil to bring level to the FULL mark on dipstick.

· Add oil through dipstick tube.

Approximate crankcase capacity:

· 724D - 621 mL (21 fl. oz.)

M71567

· Install and tighten dipstick.

Cleaning And Gapping Spark Plug

c CAUTION: Avoid injury! Before you remove spark plug:

· STOP engine

· Let engine cool.


IMPORTANT: Avoid damage! DO NOT clean spark plug with abrasives.

Clean and gap spark plug at the beginning of season or every 25 operating hours.

M94191

1. Clean area around spark plug.

2. Disconnect spark plug wire (A).

3. Remove and inspect spark plug:

· Clean plug and check for damage, replace if necessary.

· If plug is in good condition, check gap.

M85200

4. Check and adjust spark plug gap (B):

· 0.76 mm (0.030 in.)

5. Install spark plug and tighten to 20 N·m (15 lb-ft.).

6. Install spark plug wire.

Cleaning Cylinder Fins

M94189

Inspect cooling fins (A):

· Every 100 operating hours or yearly (more often if conditions require) remove cooling shrouds and clean cooling fins.

· Also clean external surfaces of your engine of dust, dirt, and oil deposits which can contribute to improper cooling.

Replacing Shear Bolts

c CAUTION: Avoid injury! Stop engine, remove key, wait for all moving parts to stop and remove wire from spark plug before leaving operator's position and attempting to maintain or inspect auger.


IMPORTANT: Avoid damage! Replacement shear bolts MUST BE the same as original shear bolts on your snowblower. · Softer bolts may shear too easily. · Harder bolts may not shear and may cause other parts of your snowblower to suffer damage.

NOTE: Two extra shear bolts were included with your snowblower.

1. Stop engine.

M94196

2. Inspect both shear bolts (A). If necessary, remove broken shear bolt(s).

3. Lubricate auger shaft at four points (B). Turn auger shaft several times to distribute grease.

4. Line up holes in auger with hole in auger shaft.

5. Install new shear bolt and lock nut.

6. Tighten nut.

Checking Tire Pressure

M86550

Check tires for wear or damage, replace as required.

Check tire pressure (A) with an accurate gauge. Tire pressure should be:

· 165 kPa (24 psi) maximum.

Adjusting Carburetor

NOTE: The carburetor is calibrated by the engine manufacturer and should not require any adjustments.

If engine is operated at altitudes above 1829 m (6,000 ft.), some carburetors may require a special high altitude main jet. See your John Deere dealer.

Possible engine surging will occur at high rpm when the transmission is in neutral ("N") and the PTO switch is in the OFF position. This is a normal condition due to the emission control system.

If engine is hard to start or runs rough, check the Troubleshooting section of this manual.

After performing the checks in the troubleshooting section and your engine is still not performing correctly, contact your John Deere dealer.

Drain Carburetor

M94184

To remove fuel from the carburetor bowl:

· Turn fuel shut off valve (A) to the closed (OFF) position.

· Place a small container under the carburetor.

· Press drain plug (B) in until all fuel is removed from bowl.

M94192

· Release drain plug.

Lubricating Auger Gearbox

M86551

Check oil level at the beginning of season or every 25 operating hours.

Check gearbox fluid level:

1. Clean area around fill plug.

2. Park unit on level surface.

3. Remove plug (A).

4. Fluid level should be at oil fill plug.

5. If necessary, add fluid.

6. Install plug.

Lubricating Auger Shaft

Auger shaft should be lubricated at the beginning of season or every 25 operating hours.

Lubricate auger shaft:

M94196

1. Remove shear bolts (A).

2. Turn auger on shaft while applying grease to grease fittings (B).

3. Install shear bolts.

Lubricating Internal Drive

Internal drive should be lubricated at the beginning of season or every 25 operating hours.

1. Park snowblower on a hard, smooth surface.

2. Stop engine, remove key, wait for all moving parts to stop.

c CAUTION: Avoid injury! Help prevent fuel spillage. Before tipping unit up onto housing, remove enough fuel so that no spillage will occur.

3. Remove wire from spark plug to prevent accidental starting.

M94193

4. Tip machine forward onto housing (A).

M86553

5. Remove two bolts (B) and loosen two bolts (C) to remove access panel (D).

c CAUTION: Avoid injury! DO NOT touch engine or snowblower drive parts which are hot from operation. Allow such parts to cool before servicing unit.


IMPORTANT: Avoid damage! DO NOT allow grease or oil to get on friction wheel and drive disc (E) or drive belts.

M86554

6. Lightly apply oil to:

· Wheel drive spring assembly (F).

· Hex shaft (G).

· Speed selector linkage (H).

· Bushing (I).

7. Install access panel.

Lubricating Discharge Chute

Discharge chute should be lubricated at the beginning of season or every 25 operating hours.

M86555

Lubricate discharge chute:

· Turn discharge chute while applying grease to base (A).

Changing Friction Wheel

1. Park snowblower on a hard, smooth surface.

2. Stop engine, remove key, wait for all moving parts to stop.

c CAUTION: Avoid injury! Help prevent fuel spillage. Before tipping unit up onto housing, remove enough fuel so that no spillage will occur.

3. Remove wire from spark plug to prevent accidental starting.

M94193

4. Tip machine forward onto housing (A).

M86553

5. Remove two bolts (B) and loosen two bolts (C) to remove access panel (D).

c CAUTION: Avoid injury! DO NOT touch engine or snowblower drive parts which are hot from operation. Allow such parts to cool before servicing unit.


IMPORTANT: Avoid damage! To ensure proper machine operation, DO NOT allow grease or oil to get on friction wheel (E), drive disc or drive belts.

M86554

6. Remove right hand wheel and tire.

7. Remove bearing flange on right side of frame

8. Slide friction wheel assembly (E) and hex shaft (F) to the right until left end of hex shaft comes free of the left bearing and pinion.

9. Remove three cap screws securing friction wheel to hub and remove friction wheel.

10. Secure new friction wheel onto hub with three cap screws. Tighten cap screws to 11-13 N·m (8-10 lb-ft).

11. Position friction wheel hub in forks (G). Be sure washers are in place on bearing flange pins. Slide hex shaft to left and into pinion and left bearing with flat washers in position. Pinion gear must mesh with large gear.

12. Install bearing flange and right hand tire and wheel.

13. Install access panel.

Changing Auger Drive Belt Or Traction Drive Belt

1. Park snowblower on a hard, smooth surface.

2. Stop engine, remove key, wait for all moving parts to stop.

c CAUTION: Avoid injury! Help prevent fuel spillage. Before tipping unit up onto housing, remove enough fuel so that no spillage will occur.

3. Remove wire from spark plug to prevent accidental starting.

M94198

4. Disconnect auger chute rotation linkage:

· Remove 1/4 x 1-1/4 cap screw (A), Lock washer, Flat washer and spacer.

· Remove 5/16 x 5/8 cap screw (B), Lock washer and Flat washer.

· Lift discharge chute (C) off housing.

M86557

5. Remove two cap screws (D) to remove belt cover (E).

M86558

6. Disconnect belts from engine:

· Auger drive belt (E).

· Traction drive belt (D).

M86559

7. Loosen lower cap screws (G).

8. Support handle bars and remove upper cap screws (F).

9. Push down on handle bars. Unit will separate, put handle bars on floor.

M86560

A - Auger drive belt

B - Traction drive belt

10. Inspect drive belts. Remove and replace belts as required.

Assemble Unit


IMPORTANT: Avoid damage! Lower cap screws (G) must fully engage slots in frame. Auger drive belt (E) must be fully engaged around sheave.

1. Install upper and lower hardware (F and G).

2. Install drive belts on engine.

3. Install belt cover.

4. Install discharge chute and connect auger linkage.

Adjusting Chute Crank

M86561b

1. Park snowblower on a hard, smooth surface.

2. Stop engine, remove key, wait for all moving parts to stop.

3. Remove wire from spark plug to prevent accidental starting.

4. Adjust chute crank:

· If chute crank is too tight, loosen nut (A).

· If chute crank is too loose, tighten nut (A).

Adjusting Chute Deflector

M94199

1. Park snowblower on a hard, smooth surface.

2. Stop engine, remove key, wait for all moving parts to stop.

3. Remove wire from spark plug to prevent accidental starting.

4. Adjust chute deflector:

· If chute deflector is too loose, tighten nut (A).

· If chute deflector is too tight, loosen nut (A).

Adjusting Impeller / Auger Brake

M86565

1. Park snowblower on a hard, smooth surface.

2. Stop engine, remove key, wait for all moving parts to stop.

3. Remove wire from spark plug to prevent accidental starting.

4. Remove two cap screws (A) to remove belt cover (B).

M86566

5. Check clearance between brake pad (C) and auger drive belt (D):

· With auger drive lever released, the brake pad (C) must contact auger drive belt (D).

NOTE: When the auger drive cable has some slack in it; that means maximum spring force is being applied to the brake arm (E).

M86567

6. Check auger drive cable (F), cable should have some slack in it. If cable is tight or very loose, change cable length by adjusting nuts (G).

7. Install belt cover.

Adjusting Auger Drive Belt Tension

M86565

1. Park snowblower on a hard, smooth surface.

2. Stop engine, remove key, wait for all moving parts to stop.

3. Remove two cap screws (A) to remove belt cover (B).

c CAUTION: Avoid injury! It is necessary to perform this adjustment with the belt cover removed, and extreme care is to be taken to prevent injury. Stand well clear of the open belt drive while engine is running.

4. Check impeller / auger brake adjustment before adjusting tension on the auger drive belt.

M86563

5. Start the engine and run at full throttle.

6. Slowly depress the auger drive lever (C) until the auger shaft begins to rotate. At this point the auger drive lever should be between 76 to 83 mm (3 to 3-1/4 in.) (D) from the handle grip.

7. If your dimension is not within this range, shut off the engine and adjust the auger drive belt tension as required.

NOTE: A 1.5 mm (1/16 in.) adjustment of the pulley will result in an approximate 6 mm (1/4 in.) change in the measurement (D).

M86566

8. To adjust the belt tension, loosen the idler arm pulley lock nut (E) and move the pulley (F) to loosen or tighten the belt tension.

9. Tighten lock nut (E).

10. Repeat steps 5 through 8 until adjusted properly.

Adjusting Traction Drive Clutch

Adjust traction clutch to compensate for wear of friction wheel when slippage occurs.

M94180

1. Park snowblower on a hard, smooth surface.

2. Stop engine, remove key, wait for all moving parts to stop.

3. Remove wire from spark plug to prevent accidental starting.

4. Put speed selector lever (A) in first gear.

M86568

5. Pull the wheel drive clutch arm (B) upward until you feel a positive stop. Hold the wheel drive clutch arm in this position.

M86564

6. Move the traction drive lever (C) until it is 83 - 95 mm (31/4 - 3-3/4 in.) (D) from the handle grip.

7. With the wheel drive clutch arm (B) held upward and the traction drive lever held down to dimension (D) there should be no slack in cable (E), adjust the cable length as required:

a. Loosen lock nut (F).

b. Lengthen or shorten cable (E) by turning adjusting sleeve (G).

c. Tighten lock nut (F).

d. Repeat steps 5 - 7 until there is no slack in cable.

Adjusting Speed / Shift Linkage

c CAUTION: Avoid injury! Help prevent fuel spillage. Before tipping unit up onto housing, remove enough fuel so that no spillage will occur.

M94180

1. Park snowblower on a hard, smooth surface.

2. Stop engine, remove key, wait for all moving parts to stop.

3. Remove wire from spark plug to prevent accidental starting.

4. Put speed selector lever (A) in reverse R2 position.

M94193

5. Tip machine forward onto housing (B).

M86553

6. Remove two bolts (C) and loosen two bolts (D) to remove access panel (E).

M86569

7. Loosen both lock nuts (F) on the shift lever linkage.

M86570

8. Slide hex shaft (H) to the right. Roll pin (G) will be up against the side frame. Hold shaft in the position.

9. Slide friction wheel (I) to the left until it is up against roll pin (J).

10. Tighten both lock nuts (F) on shift lever swivel.

11. Check to make sure friction wheel (I) is up against roll pin (J) and roll pin (G) is up against the side frame.

12. Check operation of shift lever linkage:

· Shift lever in "R2", the friction wheel should contact roll pin (J).

· Shift lever in "6", the friction wheel should not travel beyond the friction plate diameter.

13. Install access panel and return unit to its operating position.

14. Start engine and check for proper operation of the speed selector lever.

Filling Fuel Tank

Use regular grade 87 octane unleaded fuel.

Add John Deere fuel stabilizer to fuel before using it in your machine to prevent engine damage due to stale fuel. Follow directions on stabilizer container.


IMPORTANT: Avoid damage! Dirt and water in fuel can cause engine damage: · Clean dirt and debris from the fuel tank opening. · Use clean, fresh, stabilized fuel. · Fill the fuel tank at the end of each day's operation to keep condensation out of the fuel tank. · Use a non-metallic funnel with a plastic mesh strainer when filling the fuel tank or container.