Toro 22533, Operator'S Manual, Page: 18 / 20

Replacing the Drive
Sprocket
Over time, the drive sprocket will wear, especially
when used in sandy or clay soils. When this happens,
the digging chain will begin to slip. If the chain slips,
replace the drive sprocket as follows:
1. Park the machine on a level surface, disengage
the auxiliary hydraulics, engage the parking
brake, and lower the loader arms.
2. Raise the trencher a few centimeters (inches)
above the ground.
3. Shut off the engine and remove the key.
4. Remove the spoils auger ( Figure 20 ).
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Figure 20
1. Bolt (5/8 x 4 inches) 4. Drive sprocket
2. Spoils auger 5. Jam nuts and tensioning
bolt (2)
3. Locknut (5/8 inch)
5. Loosen the jam nuts and move them to as close
to the head of the tensioning bolts as possible
(
Figure 20 ).
6. Remove the chain from the drive sprocket and
boom.
7. Remove the 6 bolts (5/8 x 2-1/2 inches) and nuts
(5/8 inch) securing the drive sprocket (
Figure
20 ).
8. Remove and discard the drive sprocket ( Figure
20 ).
9. Clean the sprocket mounting surface on the
trencher.
10. Apply thread-locking compound to the 6 bolts
(5/8 x 2-1/2 inches), and install the sprocket
halves, bolts, and nuts (5/8 inch) finger tight
(
Figure 20 ).
11. Slowly begin tightening the bolts progressing
around the sprocket until all bolts are torqued to
129 to 155 N∙m (95 to 115 ft-lb).
Important:
Tighten each bolt only half way
first, working your way around the 6 bolts,
then return to each bolt in turn and torque
them.
12. Install the digging chain; refer to Installing the
Digging Chain (page 16) .
13. Install the spoils auger; refer to 4 Installing the
Spoils Auger (page 8) .
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