A-10. Bleeding air from hydraulic cylinders

A-10

After disassembling for transportation, changing the oil in the hydraulic tank, or removing the hydraulic cylinders or work equipment piping, bleed the air from the hydraulic circuit as follows. When checking the hydraulic oil level, see "4. Oil level check position".

1.Cylinder with piston valve (Blade lift cylinder)

1)Check the oil level in the hydraulic tank. (Check that the oil level is between "L" and "H" of the sight gauge. If it is not between "L" and "H", add oil.)

2)Start the engine and run at low idle for approx. 5 minutes.

3)While running the engine at low idle, extend and retract the cylinder for 5 minutes.

However, do not move the cylinder to the stroke end. a Operate the piston rod to approx. 100 mm from the end of the stroke; do not relieve the circuit under any circumstances.

4)Keeping the engine at low idle, retract the cylinder to a point approx. 100 mm before the end of the stroke, then use fine control (at least 10 seconds) to retract the cylinder to the end of its stroke. While operating the lever, hold the cylinder in this position for 3 minutes.

5)With the engine at high idle, retract the cylinder to a point approx. 100 mm before the end of the stroke, then use fine control (at least 10 seconds) to retract the cylinder to the end of its stroke. While operating the lever, hold the cylinder in this position for 1 minute.

2.Cylinder without piston valve (Blade tilt cylinder, ripper lift cylinder, ripper tilt cylinder)

1)Check the oil level in the hydraulic tank. (Check that the oil level is between "L" and "H" of the sight gauge. If it is not between "L" and "H", add oil.)

2)Start the engine and run at low idle for approx. 5 minutes.

3)While running the engine at low idle, extend and retract the cylinder for 5 minutes.

However, do not move the cylinder to the stroke end. a Operate the piston rod to approx. 100 mm from the end of the stroke; do not relieve the circuit under any circumstances.

4)While running the engine at high idle, repeat this operation for 5 minutes. Then run the engine at low idle and operate the piston rod to the end of its stroke to relieve the circuit.

k If from the beginning the engine is run at full throttle; or the cylinders are operated to the end of their stroke, the piston packing may be damaged, so never operate in this way.

k Check the oil level, and add oil to the specified level if necessary.

A-10

3.After bleeding air, leave the engine stopped for 1 hour.

1)After leaving for 1 hour, check the oil level in the hydraulic tank. (Check that the oil level is between "L" and "H" of the sight gauge. If it is not between "L" and "H", add oil.)

4.Oil level check position (Sigmadozer) Lower the blade on the ground so that angle (a) of its backside is 6°. Lower ripper (b) on the ground vertically so that the pin is at the lowest position.

<Reference>

Blade (DUAL)

Ripper (VGR, VMR) Item Dimension

Tilt cylinder length1,294 mm

Lift cylinder length1,477 mm Tilt cylinder length1,431 mm

(Semi U-dozer, U-dozer) Lower the blade on the ground so that backside (a) is upright. Lower ripper (b) on the ground vertically so that the pin is at the lowest position. <Reference>

Blade (SINGLE)

Ripper (VGR, VMR) Blade (SINGLE) Ripper (VGR, VMR) Item

Dimension Tilt cylinder length1,294 mm Brace 1,294 mm Lift cylinder length1,477 mm

Blade (DUAL)

Ripper (VGR, VMR) Item Dimension

Tilt cylinder length1,372 mm

Lift cylinder length1,477 mm Tilt cylinder length1,431 mm

Tilt cylinder length1,431 mm Item

Dimension Tilt cylinder length1,372 mm Brace 1,372 mm Lift cylinder length1,477 mm Tilt cylinder length1,431 mm