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This guide documents the replacement of the transmission assembly for a 30" Toro TimeMaster Lawmower (21199). This transmission (part #131-9665) can be found at https://www.themowershop.com/product/tor... .
This is a moderately difficult replacement that will take approximately 2 1/2 hours and potentially require a few niche tools to be purchased.
Successful completion of this replacement will fix the self drive system.
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Remove spark plug wire and spark plug using a 5/8" socket to prevent accidental ignition of mower.
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Prop up the rear end of the lawnmower using a jack stand, scissor jack, or some other stable platform. Both rear wheels should be off the ground.
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Use 2 wedges/wood blocks to keep the front wheels stationary.
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Set tire-height adjustment lever to forward-most position (past "A").
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Remove center nut from wheel using 9/16" socket.
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Remove the wheel, washer, and plastic cover.
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Pry off the metal gear-retaining clip using a flathead screwdriver.
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Remove gear.
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Remove the snap ring using snap ring pliers.
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Use a 1/2" socket wrench to remove the bolt holding the bearing assembly from the wheel.
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Flip the lawnmower so that the underside is visible.
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Remove the drive belt from the two mounted locations at the transmission housing and engine shaft.
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Disconnect transmission stabilizing spring.
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Remove the plastic covers (3) from the transmission shaft.
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Use a 3/8" socket wrench to remove the bolts from the supporting tab.
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Remove the transmission from the underside of the lawnmower.
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Remove the drive cable from the transmission housing.
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Ensure that the large spring located on the right side of the picture is disconnected from the transmission housing as well.
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Re-attach the drive cable at the cable mounting point of the new transmission.
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Slide on the transmission support tab to the transmission shaft.
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Slide transmission shaft back into slot.
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Re-attach the springs to the transmission housing.
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Use a 3/8" socket wrench to install the 2 bolts on the bearing support tab to the underside of the lawnmower.
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Re-install the belt to the two mounting points.
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Re-attach the plastic covers (3) to the transmission shaft.
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Flip the lawnmower back to its original position.
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Place the scissor jack and wood blocks to support the lawnmower.
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Re-install the wheel bearing and bolt on the right-side wheel using a 1/2" socket wrench.
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Secure a clamp between the gold rod assembly and the mower sidewall to ensure that the components added next won't slide off.
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On the other side, re-install the height adjustment lever, wheel bearing, and bearing bolt using a 1/2" socket wrench.
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Re-install the snap ring using a pair of snap ring pliers. There is a groove in the rod that the snap ring must fit around.
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Use a flathead screwdriver to re-install the metal gear-retaining clip.
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Re-install the wheel cover and the washer.
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Re-install wheel and use a 9/16" socket wrench to re-attach the center nut.
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Return to the other side and remove the clamp.
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Refer to Steps 25, 27-32
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Use a 5/8" socket wrench to re-install the spark plug.
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Re-attach the spark plug cable.
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Is there supposed to be a return spring on the other end of the lever that the traction cable attaches to?
