OPERATING INSTRUCTIONS
AU103170 H5B 34
7. Move the trencher boom lever to LOWER the boom to
approximately 152 mm (6 inches) above the ground.
8. Move the digging chain clutch lever to ENGAGE
(start).
NOTE:
You MUST be seated in the operator’s seat before
engaging the digging chain clutch or the engine will shut
down in 5 seconds.
9. Move the creep lever to REVERSE to begin slight
reverse travel. This will counter chain pull in the
opposite direction when the chainline contacts the
ground.
10. Slowly move the trencher boom lever to LOWER the
boom to the necessary depth.
11. After the trench is approximately 610 mm (2 feet)
long, stop the machine. Raise the boom and pull the
digging chain clutch Lever to the DISENGAGE (stop)
position to stop the digging chain.
12. Move the crumber bar into the operating position.
13. Move the digging chain clutch Lever to the ENGAGE
(start) position to actuate the digging chain.
14. Slowly lower the boom into the open trench until the
boom is at the correct depth. Continue the trench.
NOTE:
The trencher operates best at full throttle. Adjust
ground speed to keep from lugging the engine.
15. Any steering must be gradual.
Do not make sharp
turns with the boom in the ground. Sharp turns with
the trencher operating will cause damage to the
machine.
16. Check the digging chain tension when starting a new
trench in each location. See Trencher Digging Chain
Tension in this manual.
Do the following when you have finished the trench:
1. When the trench is completed, stop the machine by
moving the creep lever to NEUTRAL. Raise the boom
slowly until the boom is out of the trench
approximately 152 mm (6 inches).
2. Move the digging chain clutch Lever to the
DISENGAGE (stop) position to stop the digging chain.
3. Move the trencher boom lever to RAISE until the
boom is in the TRANSPORT position.
4. Move the throttle to IDLE and stop the engine, apply
the parking brake, and remove the key.
Cutting A Straight Trench
To cut a straight trench, stretch a string line parallel to the
the proposed trench on the opposite side of the machine
auger. Using the tire as a reference point on the machine,
move the trencher parallel to the string line. Maintain an
equal distance between the tire and the string line and
the trench will be straight.
If the Trench Becomes Crooked
As the trencher is digging it may vary slightly from a
straight line. This can occur if you are digging too fast 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.
Cutting A Curved Trench
NOTE:
Do not make sharp turns with the boom in the
ground. Sharp turns with the trencher operating will
cause damage to the machine.
A gradual curve can be made by GRADUALLY moving the
direction/speed control 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. To cut a
sharp curve with the trencher, see the illustration below.
B1493A88
Example “A” - If the cable or pipe is flexible enough for
a sharp 90 degree corner, cut a new trench 90 degrees to
the previous trench.
Example “B” - If the cable or pipe is not flexible enough
for a sharp corner, use a backhoe to open up the corner
to allow for a more gradual bend.
Digging Efficiency
In order to obtain maximum digging efficiency from your
trencher, always keep good sharp teeth at the necessary
spaces. As teeth become worn, replace them immediately.
EXAMPLE “A”
EXAMPLE “B”
EXCAVATION
HOLE
BACKHOE
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