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Reconfiguring the Digging
Chain
The chain can be set up in different configurations,
depending on the width of the trench desired and the soil
conditions at the work site. Each chain has 32 links;
however, depending on the type of chain you purchased,
either all 32 or 16 of these links can have teeth fastened to
them. In this section, a link that can have teeth fastened
to it is referred to as a tooth position. At each tooth
position, the teeth are fastened in various configurations
with spacers and tubes to vary the width of cut. The tooth
configurations are placed along the chain in an order that
maximizes digging efficiency.
2
8
1
10
12
1. Chain link
2. Left, cupped tooth
3. Right, cupped tooth
4. Large spacer (comes in 3
sizes for 8", 10", and 12"
cutting width)
To reconfigure the chain, complete the following
procedure:
1. Select the chain configuration you want to install from
the chain configuration tables contained on the
following pages and obtain all necessary parts.
2. Lower the loader arms, stop the engine, and remove
the key.
3. Remove the unneeded teeth and other hardware from
the links on the top span of the chain.
Note: When removing teeth, keep the components of each
tooth set together so you can assemble them later.
4. Install each tooth set across the top span from front to
back, in the order listed in the appropriate chain
configuration table.
5
8
9
2
4
9
11
13
1
5. Short tube
6. Long tube
7. Spacer for 6", double cupped
configuration.
There are two types of teeth, cupped and triangular rock
teeth. Cupped teeth are designed to cut through and
remove soil. Triangular rock teeth cut rock and other hard
ground. The teeth are cupped or angled differently
depending on which side of the chain they are intended to
be fastened (i.e., either left or right).
The teeth are fastened to the chain links using bolts, nuts,
tubes, and spacers of varying sizes. Figure 9 illustrates
the various components of several tooth configurations.
The tables on the pages following Figure 9 illustrate the
possible chain configurations, detailing which tooth
configuration should be installed at each tooth position
around the chain for each chain configuration.
9
2
Figure 9
8. Bolt
9. Nut
10. Left triangular rock tooth
11. Right triangular rock tooth
Note: Install the tooth configuration illustrated for tooth
position 1 first, followed by the configuration for tooth
position 2, and so on.
5. Torque the bolts to 27–33 ft. lbs. (37–45 Nm).
6. When all positions are installed on the top span, start
the engine, raise the trencher slightly off the ground
using the loader arms, and slowly run the chain
forward to expose a new section of chain.
7. Stop the engine and remove the key.
8. Repeat steps 3 through 7 until all chain positions have
been changed.
10
7
1
7
3
3
8
m–4407, 4408, 4409, 4449
12. Spacer for 6", triangular rock
tooth configuration
13. Washer (for use with
triangular rock teeth only)
6
8
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