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B. Loosen the jam nut on the adjusting bolt in the
boom.
C. Loosen the adjusting bolt until you can remove
the chain from the boom
D. Remove the chain from the drive sprocket.
E. If the chain needs replacing, remove the bolt and
nut securing the spoils auger and remove the
auger and chain.
F. 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.
G. Replace the nuts, bolts, and washers securing the
boom.
H. If installing a new chain, connect the links by
pressing or hammering the clevis pin supplied
with the chain through the links, then secure the
clevis pin with the cotter pin supplied with the
chain.
Important: To avoid bending the chain
links, place blocks under and between
the links when hammering the clevis pin
through.
I. Install the chain over the drive sprocket and front
roller.
J. If you removed the spoils auger, install it using
the bolt and nut you removed previously. Torque
the bolt and nut to 75 ft-lb (102 N-m).
K. Skip to step 4 to complete the adjustment.
2. Loosen the 2 bolts and nuts securing the boom to
the trencher arm
3. Loosen the jam nut securing the adjustment bolt.
4. Turn the adjustment bolt in or out as needed to
achieve the desired tension.
5. Tighten the jam nut.
6. Torque the 2 bolts and nuts securing the boom to
135 to 165 ft-lb (183 to 223 N-m).
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. Raise the trencher a few inches above the ground.
2. Stop the engine and remove the key.
3. Remove the spoils auger (Figure 60).
1. Spoils auger
2. Bolts
3. Drive sprocket
4. Sprocket mounting surface
4. Loosen the 2 bolts and nuts securing the boom to
the trencher arm.
5. Loosen the jam nut on the adjusting bolt in the
boom.
6. Loosen the adjusting bolt until you can remove the
chain from the boom.
7. Remove the chain from the drive sprocket.
8. Remove the six bolts securing the drive sprocket
(Figure 60).
9. Remove and discard the drive sprocket (Figure 60).
10. Clean the sprocket mounting surface on the trencher
(Figure 60).
11. Slide the new sprocket onto the shaft (Figure 60).
Important: The arrow on the sprocket face
should be visible from the right side of the
trench and should point in a clockwise direction;
if not, turn the sprocket around.
12. Thread the six bolts into the sprocket finger tight
(Figure 60).
13. Slowly begin tightening the bolts progressing around
the sprocket until all bolts are torqued to 95 to 115
ft-lb (129 to 155 N-m).
Important: Tighten each bolt only half way
first, working your way around the six bolts,
then return to each bolt in turn and torque them
14. Loop the chain over the auger drive shaft and onto
the drive sprocket, ensuring that the teeth point
forward on the upper span.
15. 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.
39
Figure 60
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