Replacing The Drive Sprocket - Toro TRX-16 Operator's Manual

7. Tighten the jam nut.
8. Torque the 2 bolts and nuts securing the boom
to 183 to 223 N∙m (135 to 165 ft-lb).
Replacing the Drive
Sprocket
Over time, the drive sprocket wears, especially when
it is used in sandy or clay soils. When this happens,
the digging chain begins to slip. If the chain slips,
replace the drive sprocket as follows:
1. Park the machine on a level surface, engage
the parking brake
2. Raise the trencher a few inches above the
ground.
3. Shut off the engine and remove the key.
4. Remove the spoils auger
1. Spoils auger
2. Bolts
3. Drive sprocket
4. Sprocket mounting surface
5. Loosen the 2 bolts and nuts securing the boom
to the trencher arm.
6. Loosen the jam nut on the adjusting bolt in the
boom.
7. Loosen the adjusting bolt until you can remove
the chain from the boom.
8. Remove the chain from the drive sprocket.
9. Remove the 6 bolts securing the drive sprocket
(Figure 61).
10. Remove and discard the drive sprocket
61).
11. Clean the sprocket mounting surface on the
trencher (Figure
(Figure 61).
Figure 61
61).
12. Slide the new sprocket onto the shaft
61).
Important:
should be visible from the right side of
the trench and should point in a clockwise
direction; if not, turn the sprocket around.
13. Thread the 6 bolts into the sprocket finger tight
(Figure
14. 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:
first, working your way around the 6 bolts,
then return to each bolt in turn and torque
them
15. Loop the chain over the auger drive shaft and
onto the drive sprocket, ensuring that the teeth
point forward on the upper span.
16. Set the upper span of the chain into place on
the trencher boom, then wrap the chain around
the roller at the end of the boom.
17. Thread the adjustment bolt into the boom and
turn it in until there is 3.8 to 6.3 cm (1-1/2 to 2-1/2
inches) of slack in the chain on the bottom span.
18. Thread the jam nut down the adjusting bolt and
tighten it securely against the boom.
19. Torque the 2 bolts and nuts securing the boom
to 183 to 223 N∙m (135 to 165 ft-lb).
20. Install the spoils auger using the bolt and nut
you removed previously.
g007842
Note:
ft-lb).
(Figure
43
The arrow on the sprocket face
61).
Tighten each bolt only halfway
Torque the bolt and nut to 102 N∙m (75
(Figure