MTD 643 Assembling Your Snow Thrower, Unpacking, Loose Parts, Assembly, Shear Bolts Hex Lock Nuts

Models: 663 643

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SECTION 2: ASSEMBLING YOUR SNOW THROWER

NOTE: References to right or left side of the snow thrower are determined from behind the unit in the operating position. The “operator’s position” is defined as standing directly behind the snow thrower, facing the handle panel.

Unpacking

Remove screws from the top sides and ends of the shipping crate.

Set panel aside to avoid tire punctures or personal injury.

Remove and discard plastic bag that covers unit.

Remove any loose parts included with unit (i.e., Operator’s Manual, etc).

Roll unit out of crate.

Loose Parts

The augers are secured to the auger shaft with two shear bolts and hex lock nuts. If you hit a foreign object or ice jam, the snow thrower is designed so that the bolts may shear. Two replacement shear bolts and nuts are provided for your convenience. Store in a safe place until needed. See Figure 1.

Shear Bolts

Hex Lock

 

Nuts

Figure 1

 

Raise the upper handle assembly until it locks over the lower handle.

Look at the lower rear of the snow thrower frame to be sure all the cables are aligned with the cable roller guides.

Secure the upper handle and lower handle with the two plastic wing nuts, cupped washers and carriage bolts previously removed and tighten the upper two plastic wing nuts. See Figure 3.

Upper

Shift Rod

Shift Rod

Connector

Lower

Shift Rod

Wing Nuts

Figure 3

Slide the shift rod connector down over the end of the lower shift rod. Tap the connector until it locks over the lower shift rod. See Figure 3.

NOTE: If the connector is not properly assembled, the shift rod will pivot and you will not be able to change speeds or change directions.

Assembly

WARNING: Disconnect the spark plug wire and ground it against the engine to prevent unintended starting.

Remove the lower two plastic wing nuts, cupped washers and carriage bolts from each side of the lower handle. See Figure 2.

Lower

Handle

Handle

Panel

 

Upper Handle

 

Wing Nuts,

 

Washers, & Bolts

Figure 2

If not already attached, slip the cables that run from the handle panel to the chute into the cable guide located on top of the engine. See Figure 4.

Cable Guide

Figure 4

Unwrap the headlight wire, which is attached to the headlight beneath the handle panel.

Wind the headlight wire around the right handle until excess slack is removed.

Plug the wire from the headlight into the wire lead coming from the right side of the engine, beneath the fuel tank.

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MTD 643, 663 manual Assembling Your Snow Thrower, Unpacking, Loose Parts, Assembly, Shear Bolts Hex Lock Nuts