MTD 643 Shift Rod Adjustment, Chute Assembly, Auger Control, Skid Shoes, Carburetor, Drive Wheels

Models: 663 643

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Shift Rod Adjustment

To adjust the shift rod, proceed as follows:

Remove the hairpin clip and slide the shift rod connector up, to separate the upper shift rod from the lower shift rod. See Figure 10.

 

Shift Lever

Hairpin

 

Clip

 

Flat Washer

Ferrule

 

Clutch Rod

Upper Shift Rod

Connector

 

Hairpin Clip

 

Lower Shift Rod

 

Shift Arm

Figure 10

Place the shift lever into the sixth (6) position.

Rotate the shift arm clockwise (from the operator’s position) as far as it will go.

Thread the upper shift rod downward until the elbow on its lower end aligns with the hole found in the lower shift rod.

Reconnect the upper shift rod to the lower shift rod by reinserting the hairpin clip removed earlier and sliding the shift rod connector back down into place.

IMPORTANT: Make certain to check for correct adjustment of the shift rod as instructed under Final Adjustments in the Assembly Section, before operating the snow thrower.

Chute Assembly

The distance snow is thrown can be adjusted by changing the angle of the chute assembly. To do so, stop the engine by removing the ignition key and loosen the plastic wing knobs found on either side of the discharge chute. Pivot the chute upward or downward before re-tightening the wing knobs.

Auger Control

Refer to Auger Control Test in the Operating Section to adjust the auger control.

Skid Shoes

The space between the shave plate and the ground can be adjusted. See Figure 11.

For close snow removal on a smooth surface, raise skid shoes higher on the auger housing.

Use a middle or lower position when the area to be cleared is uneven.

Carriage

 

Bolts

Hex Nuts

 

 

Skid

 

Shoes

Figure 11

WARNING: Do not operate this snow thrower on gravel as loose gravel can be easily picked up and thrown by the auger causing injury to the operator and/or damage to the snow thrower.

Adjust skid shoes by loosening the four hex nuts and carriage bolts. Move skid shoes to desired position.

Make certain the entire bottom surface of skid shoe is against the ground to avoid uneven wear on the skid shoes. Retighten nuts and bolts securely.

Carburetor

Minor carburetor adjustment may be required to compensate for differences in fuel, temperature, altitude and load.

Refer to the separate engine manual, packed with your unit, for carburetor adjustment information.

WARNING: If any adjustments need to be made to the engine while the engine is running (e.g. carburetor), keep clear of all moving parts. Be careful of muffler, engine and other surrounding heated surfaces.

Drive Wheels

The wheels may be adjusted for two different methods of operation. Follow the steps below for adjustment. See Figure 12.

One Wheel Driving

On the right side of the unit, place klick pin in the outside axle hole only. Do not place pin through

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MTD 643, 663 manual Shift Rod Adjustment, Chute Assembly, Auger Control, Skid Shoes, Carburetor, Drive Wheels