TM 5-2420-232-10
0004
BACKHOE CONTROLS
0004
Prepare Backhoe for Operation
0004
WARNING
The stabilizers must be down when you use the backhoe or the machine may become unstable.
Each stabilizer has its own control lever and can be operated independently. Failure to follow this
warning may result in injury to personnel.
The machine is equipped with SAE ("+") pattern controls. There are two backhoe control levers. The left-hand lever operates
the boom and swing. The right-hand lever operates the dipper and bucket.
Both levers move in a "+" pattern for individual backhoe actions. Combined actions can be selected by moving the levers in
directions between the four main ones.
Both levers can be operated at the same time, for more efficient operation. The speed of the backhoe action depends on how far
you move the levers. The further you move a lever, the faster the action.
Both levers are spring-loaded to their central (hold) positions. The backhoe will stay in any position until you move it with the
levers.
A decal near the controls shows, by symbols, what lever movements cause which backhoe actions. The lever movements and
backhoe actions are explained on the following pages.
WARNING
Before you start using the backhoe, you must convert the machine into a safe and suitable working
platform. Failure to follow this warning could lead to injury or death to personnel.
Ensure the correct suspension mode is selected for the operation you are carrying out. Failure to
follow this warning may result in injury or death to personnel or damage to equipment.
NOTE
Choose a suitable digging position, avoid digging uphill if possible. Whenever possible, dump the
load on the uphill side of the excavation. Both these precautions will help to keep the machine
stable.
1.
When the machine is in the desired position, select the suspension excavator mode.
NOTE
When working on asphalt surfaces, do not roll the bucket fully forward. Keep the bottom of the
bucket flat on the ground. This will minimize damage to the surface.
2.
Roll the bucket forward, then lower it to take the weight off the front tires.
3.
Set the gear selection column switch to Neutral. Ensure it is in its detent position.
4.
Engage the parking brake (WP 0005).
5.
Turn the operator s seat to face the backhoe controls. Ensure the seat locks into position.
6.
Set the engine speed using the hand throttle to 1,800 rpm (this speed is considered suitable for most backhoe operations).
7.
Lower the stabilizers.
8.
Release the backhoe boom lock.
9.
Release the backhoe swing lock.
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