Grease gun including a relief valve and pressure monitoring

A grease gun configured to expel grease, the grease gun comprising:

• a housing;
• a pump housing supported in the housing;
• a canister coupled to the pump housing having an interior in which a quantity of grease is stored;
• a motor supported in the housing;
• a pump assembly at least partially supported in the pump housing, the pump assembly coupled to the motor to receive an output from the motor to pump grease from the canister through a flow path to an outlet of the pump housing;
• a pressure sensor in fluid communication with the flow path, the pressure sensor configured to generate a pressure signal indicating a fluid pressure in the flow path;
• a current sensor configured to measure a current drawn by the motor and generate a current signal indicating the current;
• a controller configured to receive the pressure signal and the current signal and generate an indicator signal;
• and
• a display unit coupled to the housing, the display unit including an indicator light that is illuminated based on the indicator signal.

A grease gun configured to expel grease, the grease gun comprising:

• a housing;
• a pump housing supported in the housing;
• a canister coupled to the pump housing having an interior in which a quantity of grease is stored;
• a motor supported in the housing;
• a pump assembly at least partially supported in the pump housing, the pump assembly coupled to the motor to receive an output from the motor to pump grease from the canister through a flow path to an outlet of the pump housing;
• a current sensor configured to measure a current drawn by the motor and generate a current signal indicating the current, the current signal indicating a pressure of the grease;
• a controller configured to operate the motor in a first mode and in a second mode, the controller generating an indicator signal based on the current signal;
• and
• a display unit coupled to the housing, the display unit including an indicator light that is illuminated based on the indicator signal.