Figure 5. Trenching
SIDE SLOPE TRENCHING OR
EXCAVATING
Be careful when swinging loaded bucket on hill- side. Always dump spoil on uphill side of backhoe to minimize rollover possibility.
When operating on a side slope, the backhoe must be positioned using one of these two methods as shown in Figure 6 or Figure 7.
When operating on a side slope, always place the trench spoil on the uphill side.
Figure 6. Level with Stabilizers
Cut a level pad for the uphill side of the machine and place spoil on the downhill side as shown in Figure 7.
Figure 7. Level with Cut Out
THUMB OPERATION
The mechanical thumb is used for grabbing objects and securing them between the thumb and the bucket.
Become familiar with the geometry and extra weight the thumb adds to the backhoe before operating. Large heavy objects such as rocks and logs can increase momentum when pivoting backhoe to the side. DO NOT make sudden stops and starts. Be extremely careful lifting and moving long items such as poles or tree limbs which may extend beyond the normal back- hoe operating area.
Improper usage can also damage the thumb or back- hoe.
●Do not use the thumb to rake material.
●Do not use the thumb to push or pull material.
●Do not use the side of the thumb to move material.
●Do not use as a lifting device with chain or rope.
●Do not use as a pry bar to dislodge objects.
The thumb has six operating positions. Place lower channel in the hole furthest from the dipper pivot pin and secure with clevis pin (9). Select one of the six operating positions and secure with hitch pin (7). Rotate the bucket to hold material against the thumb.
When normal backhoe operation is required, place thumb in storage position. Remove pin clevis pin (9) from end of thumb, place lower channel in hole closest to the dipper pivot pin and secure with clevis pin. Rotate thumb up against dipper, and insert hitch pin to lock thumb into storage position. See . Thumb in Stor- age Position, page 16.
7. Hitch pin, 3/4 x 4
9. Clevis pin, 1.0 x 8.0
Figure 8. Thumb in Operating Position
MAN0306 (Rev. 5/23/2008) | Operation 15 |
|
|
