Scope of application
B70 B90 pneumatic breakers are simple in design and easy to operate. They are designed for vertical demolition of concrete, asphalt, frozen soil and other hard materials in road construction and other demolition and construction work. No other use is permitted. The tools are not intended for rig-mounting.
For use in noise sensitive areas, there is an efficient muffler available as a option.
Specification
| |
|
B90 |
B70 |
| Dimensions |
mm |
745*496*162 |
725*496*162 |
| Weight without muffler |
kg |
34 |
29 |
| Cylinder diameter |
mm |
58 |
52 |
| Working pressure |
Bar |
4-6 |
4-6 |
| Max working pressure |
Bar |
6 |
6 |
| Impact energy (6 bar) |
J |
110 |
72 |
| Impact energy (5 bar) |
J |
90 |
58 |
| Impact frequency (6 bar) |
Hz |
18 |
18 |
| Impact frequency (5 bar) |
Hz |
17 |
17 |
| Air consumption (6 bar) |
l/s |
43 |
30 |
| Air consumption (5 bar) |
l/s |
37 |
24 |
| Air house inner diameter |
mm |
19 |
19 |
Troubleshooting
If the pneumatic breaker dose not start, has low power or an uneven performance, check the following points:
1) Check that the chisel used has the correct shank dimension.
2) Check that the pneumatic breaker is getting the correct amount of lubrication.
3) Note, that too much lubricant may cause starting problems, low power or uneven performance.
4) Check that the compressed air system supplies the machine with sufficient air pressure to get full power.
5) Check that the dimension and length of the air hose are in accordance to the recommendations.
6) If there is a risk of freezing, check that the machine's exhaust ports are not blocked.
7) If the machine function is still not satisfactory after this procedure, contact an authorized service workshop.
1. Machine operation and maintenance
- Clean the parts from rust-protecting oil before starting the breaker for the first time. All surfaces should be lubricated before reassembly. The tool should then be test run.
- Blow away any dirt adhering to couplings and air lines before connecting an air hose to the breaker.
- Warning! Make sure that each threaded connector is tightened before operation, in order to avoid injury t people caused by loose air hoses or parts.
- Operation without lubrication oil is not allowed. Fill the lubricator at the start of every shift. The oil chamber should be filled with the machine lying down. It should be filled to the bottom thread for the oil plug (roughly 40 ml).
- Check regularly, clean inside and change damaged parts.
- For any lengthy period of non-use, please clean and lubricate the machine for storage.
- The machine must not be modified.
Operation
- The chisel should be correctly inserted into the breaker. The chisel should be of good quality and have the correct shank dimensions.
- Keep a good balance and keep your feet away from the chisel.
- The breaker must be pressed against the work object and sufficient feed force should be applied to ensure that vibrations are at a minimum.
- Always follow local laws and safety rules.
3.Air hose an air pressure
- The inner diameter of the air hose should be no less than 19 mm and the ideal length is less than 30m. If the hose length is between 30 m and 100 m, a hose with a minimum diameter of 25 mm should be used.
- Working pressure should be 4-6 bar measured at the machine. Higher pressure (more than 6 bar) may damage the parts and be a risk, whereas, if the pressure is lower than 4 bar, the efficiency will be relatively low.
4. Lubrication oil
The choice of the correct oil viscosity varies with working temperature. Use oil with high viscosity at high temperature, use low viscosity oil at low temperature.
| Temperature |
Name |
viscosity |
| 15-50ºC |
Mineral oil or synthetic oil |
ISO VG 46-68 |
| -20-15ºC |
Mineral oil or synthetic oil |
ISO VG 22-32 |
5. Chisels
The chisels should be of good quality and have a shank of the right size and shape (including the collar).
6. Replacement of parts
Always immediately replace worn and damaged parts. Use genuine parts only; otherwise the correct functioning of the machine cannot be safeguarded.
7. Maintenance
Check the tightening of the side bolts once a week.
The nuts for the side bolts should be tightened to a torque of 160N/m. after turning to the correct torque continue turning in the same direction until you first opportunity to lock the nut with the spring pin.
Check the breaker for wear every 3 months.
Make sure the breaker is overhauled every 150 impact hours or twice a year.
A complete overhaul is required when (without a chisel in the machine) the piston can be heard to strike against metal.
8. Notes for dismantling/reassembling
All work for dismantling or reassembling should be done in accordance with the product drawing. Special care should be taken with the air valve, avoiding dirt-from the work to get into the machine. The valve must be moving freely after reassembly.
Tighten the side bolts by alternately increasing the torque on the bolts until the correct tightening torque is reached. The tightening torque of the side bolts/nuts should be 16Nm. After turning to the correct torque, continue turning to the same direction until your first opportunity to lock the nut with the spring pin.
Audited Supplier 
){kind=link}
){kind=link}