Toro 22473, Operator'S Manual

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G008940
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Figure 10
1. Bearing case fill hole plug
4. Remove the plug from the bearing case fill hole
(Figure 10).
5. Look in the hole, the level should be up to the
bottom of the hole; if not add gear lube until it
comes out of the hole.
6. Replace the plug and torque it to 15 to 17 ft-lb (20
to 23 N-m).
Changing the Gear Lube
1. Clean the area around the bearing case fill hole plug
(Figure 10).
2. Remove the plug from the bearing case fill hole
(Figure 10).
3. Lift the trencher until the boom is vertical, draining
the lube through the fill hole and into a pan.
4. Return the trencher to the ground.
5. Fill the bearing case with gear lube until it comes
out of the fill hole.
6. Replace the plug and torque it to 15 to 17 ft-lb (20
to 23 N-m).
Adjusting Digging Chain
Tension
Service Interval: Every 25 hours
With the trencher parallel to the ground, ensure that
there are 1-1/2 to 2-1/2 inches (3.8 to 6.3 cm) between
the bottom of the boom and the top of the bottom
chain span. If not, adjust the chain using the following
procedure:
Important:
Do not over tighten the chain. Excess
chain tension may damage drive components.
1. Loosen the 2 bolts and nuts securing the boom to
the trencher arm (Figure 3).
2. Loosen the jam nut securing the adjustment bolt
(Figure 3).
3. Turn the adjustment bolt in or out as needed to
achieve the desired tension.
4. Tighten the jam nut.
5. Torque the 2 bolts and nuts securing the boom to
135 to 165 ft-lb (183 to 223 N-m).
Flipping a Worn Boom
Service Interval: Every 25 hours
Inspect the bottom of the boom for wear, if it is worn,
complete the following:
Note:
If you have already flipped the boom once,
replace the boom when both sides are worn.
1. Remove the 2 bolts and nuts securing the boom to
the trencher arm (Figure 3).
2. Loosen the jam nut on the adjusting bolt in the
boom (Figure 3).
3. Loosen the adjusting bolt until you can remove the
chain from the boom (Figure 3).
4. Remove the chain from the drive sprocket.
5. Remove the boom, flip it over so the bottom
becomes the top (or if you have already flipped it
once, replace it), and install the boom again.
6. Replace the nuts, bolts, and washers securing the
boom.
7. Install the chain over the drive sprocket and front
roller.
8. Adjust the chain tension as described in Adjusting
the Digging Chain Tension.
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