Pole saw

An outdoor tool comprising:

• a powerhead;
• a tool unit powered by the powerhead;
• and
• an elongated shaft assembly extending along a shaft axis between the powerhead and the tool unit, the tool unit including
• a transmission housing fixed to the shaft assembly,
• a support plate coupled to the transmission housing,
• a cover coupled to the support plate, wherein the support plate and the cover define a cavity,
• a guide bar adjustably supported by the support plate,
• a drive gear rotatably supported by the transmission housing, and
• a chain circumscribing a portion of the drive gear and a portion of the guide bar, the drive gear operatively coupled to the powerhead for driving the chain about the guide bar,
• wherein the drive gear, a portion of the guide bar, and a portion of chain are housed in the cavity;
• and
• a lubrication system operable to lubricate the chain, the lubrication system including
• an oil reservoir,
• a pump drivingly coupled to the drive gear, an inlet tube extending from the oil reservoir to the pump defining fluid communication between the pump and the oil reservoir, a channel defined in the cavity between the support plate and a surface of the guide bar, an outlet tube extending from the pump to the cavity defining fluid communication between the pump and the cavity, and wherein operation of the pump pumps lubricant from the oil reservoir to the cavity.