SERVICE AND MAINTENANCE
Check spark plug yearly or every 100 operating hours.
1.Remove choke control knob and safety key.
2.Loosen and remove the mounting screws from the snow hood.
3.Slowly remove the snow hood, making sure that the primer bulb hose and ignition wire remain connected. See Figure 15.
4.Remove and inspect spark plug.
5.Replace spark plug if porcelain is cracked or if electrodes are pitted, burned or fouled with deposits.
6.Check electrode gap with a feeler gauge and set gap to .030 (0.76mm) if necessary. See Figure 16.
7.Reinstall spark plug and tighten securely.
8.Remount the snow hood to the engine with the mounting screws, again making sure the primer bulb hose and ignition wire are connected.
9.Connect the choke control knob to the choke shaft on the carburetor. If the choke control knob is not installed correctly, the choke will not operate.
10.Install the safety key.
NOTE: A resistor spark plug must be used for replacement. Contact a Sears Parts and Repair Center for a replacement spark plug.
Carburetor
Engines operated at about 3000 to 5000 feet (900 to 1500 meters) above sea level may require a high altitude carburetor main jet. If erratic performance is observed, contact a Sears Parts and Repair Center for cost to install/purchase a high altitude carburetor main jet.
Engine Speed
Lubrication
Drive and Shifting Mechanism
WARNING
Avoid serious injury or death, DO NOT modify engine in any way. Tampering with the governor setting can cause the engine and equipment to operate at unsafe speeds. NEVER tamper with factory setting of engine governor. Running the engine faster than the speed set at the factory is dangerous.
At least once a season or after every 25 hours of operation, remove rear cover. Lubricate all chains, sprockets, gears, bearings, shafts, and the shifting mechanism. Use engine oil or a spray lubricant. Refer to Figure 17.
NOTE: Be careful not to get any oil on the aluminum drive plate or rubber friction wheel. Doing so will hinder the snow thrower’s drive system. Wipe off any excess or spilled oil.
Wheels
At least once a season, remove both wheels. Clean and coat the axles with a multipurpose automotive grease before reinstalling wheels.
Chute Directional Control
Once a season, lubricate the eye bolt bushing and the spiral with
Mounting
Screws 
Snow Hood
Choke Control
Knob
Spark Plug
Figure 15
2 | 3 |
|
1
1. .030 (.76 mm) Gap
2.Electrodes
3.Porcelain
Figure 16
Hex Shaft
Figure 17
17