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Follow this guide to replace the motor and pump assembly on a Mi-T-M heater model MH-0190-0M10.
This guide includes the motor, pump, and capacitor all as one assembly. If only the capacitor needs to be replaced, follow this guide.
After the new motor and pump assembly is installed, use a flat blade screwdriver to adjust the pump pressure back to 7.5 PSI as instructed on page 17 of the user manual.
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Flip the power switch into the OFF position.
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Unplug any extension cords from the included power cord.
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Use a 5/16 inch socket or Phillips screwdriver to remove the eight screws securing the upper shell, four on each side.
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Lift the upper shell straight up off of the machine to remove it.
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Use a 5/16 inch socket or Phillips screwdriver to remove the four bolts securing the right-side cover.
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Tilt the right-side cover down to access the PCB board.
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Use needle nose pliers to remove the wire with the blue connector.
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Remove the wire with the clear connector.
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Remove the right-side cover.
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Use a 5/16 inch socket or Phillips screwdriver to remove the screw securing the two green ground wires to the frame.
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Use a pair of needle nose pliers to release the hose clamp from the fuel line.
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Slide the hose clamp off of the nipple, about one inch down the fuel line.
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Pull to disconnect the fuel line from the motor and pump assembly.
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Use a pair of needle nose pliers to remove the fuel line hose clamp.
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Use a pair of needle nose pliers to disconnect the wires connecting the motor and pump assembly to the main PCB board:
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One red cable labeled MOTOR 2 on the main PCB board
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One orange cable labeled MOTOR 1 on the main PCB board
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Use a pair of flush cutters to cut the cable tie harnessing the wires running from the main PCB assembly.
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Remove the cable tie.
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Use a pair of flush cutters to cut the cable tie harnessing the orange, red, white, and black wires near the fuel line.
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Use a pair of flush cutters to cut the cable tie harnessing the orange and red wires next to the motor.
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Use a Phillips screwdriver to remove the screw securing the capacitor band clamp.
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Remove the capacitor from the band clamp.
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Feed the orange and red wires out through the opening in the lower shell.
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Use a 5/16 inch socket or Phillips screwdriver to remove the four bolts securing the left-side cover.
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Use a 5/16 inch socket or Phillips screwdriver to remove the four screws securing the motor mount bracket, two on each side.
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Lift the motor, pump, and bracket assembly straight up out of the machine.
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Use a 3 mm hex key to loosen the set screw securing the fan to the motor shaft.
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Use a 5/16 inch socket or Phillips screwdriver to remove the two screws securing the motor and pump assembly to the motor mount bracket.
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Remove the motor mount bracket.
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Only the motor and pump assembly remain.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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