Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement

简介

Follow this guide to replace the two tine shaft roller bearings 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.

你所需要的

步骤 1 Turn off the ignition switch

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Turn off the ignition switch: 步骤 1 中的图像 1，1

Before starting any repair, ensure the ignition switch is in the "off" position, as shown.

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步骤 2 Remove the spark plug housing

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Remove the spark plug housing: 步骤 2 中的图像 1，1

Use a 4 mm hex wrench to remove the bolt securing the spark plug housing.
Throughout this repair, keep track of each screw and make sure it goes back exactly where it came from.

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步骤 3

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement: 步骤 3 中的图像 3，3

Remove the spark plug housing from the engine.

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步骤 4 Disconnect the spark plug

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Disconnect the spark plug: 步骤 4 中的图像 1，3

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Disconnect the spark plug: 步骤 4 中的图像 2，3

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Disconnect the spark plug: 步骤 4 中的图像 3，3

Grab the rubber housing at the end of the spark plug wire.
Pull firmly to disconnect the wire from the spark plug.

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步骤 5 Unfasten the upper handle assembly

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Unfasten the upper handle assembly: 步骤 5 中的图像 1，1

Twist and remove the knobs and acorn nuts from either side of the handle assembly.

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步骤 6 Set aside the upper handle assembly

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Set aside the upper handle assembly: 步骤 6 中的图像 1，2

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Set aside the upper handle assembly: 步骤 6 中的图像 2，2

Remove the upper handle assembly from the lower handle assembly.
Do not pull the upper handle assembly too far from the rest of the tiller as it is still connected to the engine via the throttle cable.
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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步骤 7 Remove the tine assemblies

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Remove the tine assemblies: 步骤 7 中的图像 1，2

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Remove the tine assemblies: 步骤 7 中的图像 2，2

Slide off and remove the tine retaining pin from the outer face of each tine assembly.
Caution: Take care when handling the sharp tines to prevent injuring yourself. Wear work gloves if necessary.
The tine assemblies can slide freely once their respective retention pins are removed. Do not let the assemblies fall off the tine shaft as this may damage them or result in injury.

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步骤 8

Slide off and remove both tine assemblies from the tine shaft.

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步骤 9 Remove the gear housing cover

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Remove the gear housing cover: 步骤 9 中的图像 1，1

Use a Phillips #2 screwdriver to remove the four screws securing the gear housing cover.

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步骤 10

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement: 步骤 10 中的图像 3，3

Remove the gear housing cover.

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步骤 11 Remove the worm housing gasket

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Remove the worm housing gasket: 步骤 11 中的图像 1，2

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Remove the worm housing gasket: 步骤 11 中的图像 2，2

Remove the gear housing cover gasket.
We suggest you replace this gasket during reassembly every time you open the worm gear housing to prevent any grease from leaking from the worm drive.
During reassembly, refill the worm gear housing with an adequate amount of lithium grease before installing the gasket and housing cover to ensure smooth operation of the worm drive.

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步骤 12 Remove the tine shaft

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Remove the tine shaft: 步骤 12 中的图像 1，2

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Remove the tine shaft: 步骤 12 中的图像 2，2

Use an adjustable wrench to turn the right half (in the orientation pictured) of the tine shaft clockwise, as shown.
Continue to turn the shaft clockwise until it is unthreaded from the worm gear inside the housing.

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步骤 13

Use a dead blow hammer to tap the right half of the tine shaft towards the worm housing until it can be removed.
If the shaft won't budge with the dead blow hammer, you can try using a ball-peen hammer instead.

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步骤 14

Slide the tine shaft assembly out from the left side of the worm housing and remove it.

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步骤 15 Remove the worm gear

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Remove the worm gear: 步骤 15 中的图像 1，3

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Remove the worm gear: 步骤 15 中的图像 2，3

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Remove the worm gear: 步骤 15 中的图像 3，3

Slide the worm gear up out of the worm gear housing about 1 cm.
Use a flat head screwdriver to separate the right worm gear thrust washer from the worm gear.

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步骤 16

Remove the worm gear and left worm gear thrust washer from the worm housing.
Separate the left thrust washer from the worm gear.
During reassembly, insert the worm gear into the housing before inserting the thrust washers next to it on either side. All three will be aligned properly once the tine shaft is reinserted.

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步骤 17

Remove the right worm gear thrust washer from the worm gear housing.

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步骤 18 Remove the left-hand tine shaft roller bearing assembly

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Remove the left-hand tine shaft roller bearing assembly: 步骤 18 中的图像 1，3

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Remove the left-hand tine shaft roller bearing assembly: 步骤 18 中的图像 2，3

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Remove the left-hand tine shaft roller bearing assembly: 步骤 18 中的图像 3，3

Slide off the left-hand tine shaft roller bearing assembly from the tine shaft.

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步骤 19 Separate the left-hand bearing assembly

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Separate the left-hand bearing assembly: 步骤 19 中的图像 1，2

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Separate the left-hand bearing assembly: 步骤 19 中的图像 2，2

Separate the tine shaft roller bearing from the assembly and remove it.
It is recommended that you also replace the bearing seal next to the roller bearing to prevent any grease from leaking out of the worm gear housing.

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步骤 20 Tap out the right-hand tine shaft roller bearing assembly

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Tap out the right-hand tine shaft roller bearing assembly: 步骤 20 中的图像 1，2

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Tap out the right-hand tine shaft roller bearing assembly: 步骤 20 中的图像 2，2

Insert a properly sized bushing driver into the left (as in pictured orientation) tine shaft aperture.
Use a dead blow hammer to gradually tap out the right-hand tine shaft roller bearing assembly from the gear housing.
If the bearing won't budge with the dead blow hammer, you can try using a ball-peen hammer instead.

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步骤 21 Remove the right-hand tine shaft roller bearing

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Remove the right-hand tine shaft roller bearing: 步骤 21 中的图像 1，3

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Remove the right-hand tine shaft roller bearing: 步骤 21 中的图像 2，3

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Remove the right-hand tine shaft roller bearing: 步骤 21 中的图像 3，3

Remove the right-hand tine shaft roller bearing assembly.
Separate the tine shaft roller bearing from the assembly and remove it.
It is recommended that you also replace the bearing seal next to the roller bearing to prevent any grease from leaking out of the worm gear housing.

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步骤 22 Reassembly tip: right-hand tine shaft bearing assembly

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Reassembly tip: right-hand tine shaft bearing assembly: 步骤 22 中的图像 1，2

Mantis Tiller 7940 (2017) Tine Shaft Roller Bearings Replacement, Reassembly tip: right-hand tine shaft bearing assembly: 步骤 22 中的图像 2，2

During reassembly, In order to reinstall the right-hand tine shaft roller bearing assembly, use the bushing driver to tap in the roller bearing, then bearing seal from the right side of the housing until there is enough space to insert the bearing seal retainer.
If the bearing won't budge with the dead blow hammer, you can try using a ball-peen hammer instead.

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