912 Operator’s Manual
12/4/14
Page
7
of 1 2
912 TRENCHER OPERATING INSTRUCTIONS (continued)
GETTING STARTED:
1. Start and warm up engine.
2. Put the Wheel Drive Control in neutral.
3. One wheel hub may be disengaged (free wheeling) for easier steering before driving
machine to work location.
4. Squeeze the clutch lever and change the Wheel Direction Control to desired speed and
direction.
5. Adjust the wheel speed and navigate the trencher to the starting position. The trencher is
designed to dig toward the operator (with the Wheel Drive Control in reverse). With this
in mind, position the machine to start the trench.
COLD WEATHER OPERATIONS: Before operating in cold weather, refer to the Engine
Owner’s Manual for recommended engine oil. Do not spray starting fluid into the air cleaner as
engine damage could result. If the machine is operated at temperatures below +32°F (0°C) then
changing the hydraulic fluid to ISO 46 is recommended. If you do not want to change the
hydraulic fluid but want to operate the machine at temperatures below +32°F (0°C), then do the
following:
•
Warm up engine at a low speed.
•
Gradually increase engine speed, allowing
30 minutes
for the hydraulic fluid to warm up
.
Reduce the engine speed if the hydraulic pump whines. Pump noise may indicate a lack of
hydraulic fluid flow that could damage the pump.
For frequent starts below 18°F consult your Barreto Manufacturing dealer.
TRENCHING PROCEDURE:
1. Put the Wheel Drive Direction Control in neutral
2. Be sure both hubs are engaged.
3. Have engine at full throttle (forward).
4. Hold the Dig Chain On/Off Control in On position.
5. Squeeze the clutch lever.
6. Slowly lower the digging boom until the desired trench depth is achieved.
7. Put the Wheel Drive Control in reverse. Start at slow speed.
8. Adjust the wheel speed until a workable speed is reached. Use a very slow speed for
trenching and adjust for soil conditions as necessary. If objects such as rocks or roots jam
in the chain, release the clutch lever, and then reverse the chain to dislodge the debris. If
necessary move the trencher forward a few inches and trench the area again.
TRENCHING TIPS
THE PLUNGE CUT:
If
the boom bounces when lowering it, use a more gradual “boom down” action. A little ground
travel toward the operator during the plunge cut may help reduce bounce. Adjust the boom
lowering speed for soil conditions as necessary.
Do not overload engine. If the engine lugs down or the digging chain slows down, raise the boom
until speed increases, then continue lowering the boom slowly.
Do not attempt to force the boom down faster than the digging chain can remove the
material!
