Toro 25200, Руководство оператора

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Operation
Selecting the Proper
Components for the Trencher
Using the correct trencher components helps to increase
the trenching speed and extending the life of the trencher.
Contact an Authorized Toro Service Dealer for more
information on parts for your trencher.
Selecting the Proper Chain
It is important to have the correct chain for the job. The
soil conditions will determine the type of chain that has the
strength and tension that you need. A chain that is too light
wears fast or breaks; a chain that is too heavy increases the
load on the machine and reduces the trencher digging speed;
however, a heavy chain has a longer wear life than a lighter
chain.
You can configure the trencher with an anti-backflex digging
chain that is designed for hard digging conditions or a welded
H-plate chain for extreme conditions. The side plates of the
anti-backflex digging chain are close together. As the chain
leaves the sprocket, each link comes together and forms a
solid digging channel. This action keeps each tooth at the
correct digging angle. The welded H-plate chain is for digging
in the most extreme conditions.
Important:
Maintain the correct chain tension. If the
chain is too tight or too loose, the digging efficiency
decreases and the parts wear more quickly. Refer to
Checking the Chain Tension (page 18) .
Note:
Trencher chains are rated by their tensile strength; for
example, a 34 019 kg (75,000 lb) chain takes a minimum of 34
019 kg (75,000 lb) of pull to break the chain.
Select the chain type; choose either a anti-backflex chain or a
welded H-plate chain (
Figure 20 and Figure 21 ).
Figure 20
1. Anti-backflex chain
Figure 21
1. H-plate chain
Selecting the Proper Digging Teeth
The most important component of the trencher are the
digging teeth; the type of teeth that you select and the
arrangement of teeth that you use greatly affects the digging
efficiency and tooth wear.
•
Choose the teeth type:
– cupped teeth
– rock/frost bit
– shark teeth
– cupped teeth and rock/frost bit combination
– cupped and shark teeth combination
•
Choose the tooth arrangement width:
– 152 mm (6 inch)
– 203 mm (8 inch)
Types of Digging Teeth
The types of digging teeth are as follows:
•
Cupped teeth ( Figure 22 ) are the best for cutting
through light to medium soil. The cupped design of the
tooth cuts through the soil and then moves it up and out
of the trench.
1
G02191 1
Figure 22
1. Cupped teeth
•
Rock and frost teeth ( Figure 23 ) or shark teeth ( Figure
24 ) are best for cutting ground that is very hard, rocky, or
frozen; it is also used for cutting through asphalt.
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