WORK EQUIPMENT CONTROLS AND OPERATIONS

Warning

● If the lever is operated when the auto-deceleration is being actuated, the engine speed will suddenly rise, so be careful when operating the lever.

● If the work equipment control lever is operated quickly, the work equipment will move quickly; if the lever is operated slowly, the work equipment will move slowly.

The work equipment is operated by the left and right work equipment control levers.The left work equipment control lever operates the arm and swing, and the right work equipment control lever operates the boom and bucket.

The movements of the lever and work equipment are as shown in the diagrams on the right.When the levers are released, they automatically return to the neutral position and the work equipment is held in place.

● When the machine is at a standstill, and the work equipment levers are put in neutral, the engine speed is kept at medium speed due to the function of the auto-deceleration, even if the fuel control dial is set at the MAX position.

Remark

If the levers are operated within 15 seconds after stopping the engine, it is possible to lower the work equipment to the ground.

In addition, the levers can al so be operated to release any remaining pressure inside the hydraulic cylinder circuit and to lower the boom after loading the machine on a trailer.

Handling Working Mode

Working Mode

The mode selector switch can be used to switch the mode to match the operating conditions and purpose, thereby enabling work to be carried out efficiently.

Make effective use of each mode as follows.

When the starting switch is turned ON, the working mode is automatically set to H mode, so normal operations can be carried out without setting the mode.

Use the working mode switch to set the mode to the most efficient mode to match the type of work.

Working modeApplicable work

DH mode

Large capacity digging, loading in a short time quarry

H modeNormal digging, loading operations

G mode

Fine operations not needing digging power or speed, Grading, leveling, hauling operations

Prohibited Operations

Warning

● If it is necessary to operate the work equipment control lever when the machine is traveling, be extremely careful when operating.

● If any lever is operated when the auto-deceleration is being actuated, the engine speed will suddenly increase, so be careful when operating.

Operations Using Swing Force

Do not use the swing force to compact soil or break objects. This is not only dangerous, but will also markedly reduce the life of the machine.

Operations Using Travel Force

Do not dig the bucket into the ground and use the travel force to carry out excavation. This will damage the machine or work equipment.

Operations Using Hydraulic Cylinder Stroke Ends

If the cylinder is used when the cylinder rod has been operated to the end of its stroke during operations, external force will cause impact to the work equipment, and this will damage the hydraulic cylinders. Avoid ca rrying out operations with the hydraulic cylinder fully retracted or fully extended.

Operations Using Bucket Dropping Force

Do not use the dropping force of the machine for digging, or use the dropping force of the bucket as a pickaxe, breaker, or pile driver.

This will markedly reduce the life of the machine.

Operations Using Machine Dropping Force

Do not use the dropping force of the machine for digging.

Digging Hard Rocky Ground

It is better to excavate hard rocky ground after breaking it up by some other means. This will not only reduce damage to the machine but make for better economy.

General Operation Information Traveling

When traveling over obstacles such as boulders or tree stumps, the machine (in particular, the undercarriage) is subjected to a large shock, so reduce the travel speed and travel over the obstacle at the center of the tracks. As far as possible, remove such obstacles or avoid traveling over them.

Permissible Water Depth Caution

When driving the machine out of water, if the angle of the machine exceeds 15°, the rear of the upper structure will go under water, and water will be thrown up by the radiator fan. This may cause the fan to break. Be extremely careful when driving the machine out of water.

Do not drive the machine in water deepen than of the center of carrier roller (1).

Supply grease to the parts which have been under water for a long time until the used grease is projected out of the bearings (around the bucket pin, in particular).