Toro RT600 Operator's Manual page 16

Figure 27
1. Crumber bar (optional)
5. When the engine has reached the operating
temperature, move the machine to the work area and
position the machine to cut the trench.
Note: Ensure that the end of the trencher boom is
several feet beyond the starting point of the trench.
6. Align the machine to the center line of the new trench.
7. Adjust the engine speed to the Full throttle position,
and lower the boom to just above the ground.
8. Start the digging chain by moving the rear attachment
control lever toward the front of the machine.
Note: You must be seated in the operator seat before
moving the machine; otherwise, the engine stops in
1 second.
Note: The crumber (if equipped) automatically moves
from the T
RANSPORT
position when the trencher attachment reaches the
maximum dig depth.
9. Move the utility-traction lever forward until the
machine starts to move forward.
10. Lower the boom into the ground.
11. When the digging chain is lowered to the desired depth,
move the utility-traction lever forward until the engine
speed decreases about 10% (200 to 300 rpm).
Note: Remember that speed on the tachometer.
position into the O
PERATING
12. Decrease the digging chain speed and look at the
tachometer.
Note: If the engine speed increases, push the
utility-traction lever forward until the engine speed is
the same that in step 11. Repeat this step to obtain
the best trenching speed.
Note: Some hard soil conditions allow you to dig a
trench faster by reducing the chain speed.
WARNING
Operating a trencher attachment without a
restraint bar or a crumber could result in server
personal injury or death if the chain breaks.
Do not operate a trencher attachment without
a restraint bar.
Note: The trencher operates best when the engine is
at full throttle. Adjust the ground speed to keep from
lugging the engine.
Important: All steering should be gradual. Do not
make sharp turns with the boom in the ground.
Marking sharp turns while digging with the
trencher will damage the trencher.
Note: Check the chain tension when you are starting
a new trench in each location; refer to
Chain Tension (page
Cutting a Curved Trench
Important: Do not make sharp turns with the boom in
the ground. Marking sharp turns while digging with the
trencher will damage the trencher.
You can make a gradual curve by using the rear-wheel steering
control only as needed to slightly articulate the machine. Do
not make steering corrections, as this will swing the boom
into the side of the trench and undercut it.
Straightening a Crooked Trench
As the trencher is digging, it may vary slightly from a straight
line; this can occur if you are digging too quickly for the soil
conditions. To straighten the trench, raise the boom, reverse
the ground travel and move the trencher forward until the
digging chain clears the trench. Correct the alignment of the
trencher to the trench and lower the boom.
Finishing the Trench
1. When you complete the trench, stop the machine.
2. Slowly raise the boom until it is out of the trench about
15 cm (6 inches).
3. Move the attachment ground speed control lever to the
N (disengaged) position to stop the digging
EUTRAL
chain.
16
Checking the
18).