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Follow this guide to replace the worm gear in the Mantis 7940 Tiller (2017).
For this guide, you will need to use a hammer to tap out certain components that are friction fit into place. In order to do this, you will need to find a way to brace the tiller in place so it doesn’t move around during the process. You can use a vice, or have someone else brace the part while you use the hammer.
You will need replacement lithium grease for this repair.
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Use a 4 mm hex wrench to remove the bolt securing the spark plug housing.
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Remove the spark plug housing from the engine.
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Grab the rubber housing at the end of the spark plug wire.
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Pull firmly to disconnect the wire from the spark plug.
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Twist and remove the knobs and acorn nuts from either side of the handle assembly.
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Remove the upper handle assembly from the lower handle assembly.
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Un-clip the throttle cable from the cable clips on either side of the handle assembly and set the upper handle assembly aside.
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Slide off and remove the tine retaining pin from the outer face of each tine assembly.
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Slide off and remove both tine assemblies from the tine shaft.
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Use a Phillips #2 screwdriver to remove the four screws securing the gear housing cover.
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Remove the gear housing cover gasket.
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Use an adjustable wrench to turn the right half (in the orientation pictured) of the tine shaft clockwise, as shown.
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Continue to turn the shaft clockwise until it is unthreaded from the worm gear inside the housing.
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Use a dead blow hammer to tap the right half of the tine shaft towards the worm housing until it can be removed.
we tried, the gear spins but feels like it keeps catching on something? im doing everything as its telling me but yet, the shaft wont budge an inch..
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Slide the tine shaft assembly out from the left side of the worm housing and remove it.
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Slide the worm gear up out of the worm gear housing about 1 cm.
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Use a flat head screwdriver to separate the right worm gear thrust washer from the worm gear.
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Remove the worm gear and left worm gear thrust washer from the worm housing.
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Separate the left thrust washer from the worm gear.
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Remove the right worm gear thrust washer from the worm gear housing.
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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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crwdns2947410:01crwdne2947410:0
Help I can't get the shaft to unthread
