BorMann BCD4050 Manual page 6

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• The guide bar is not deformed or damaged.
• There is no obvious change in the depth of the guide bar groove.
• The guide rail is smooth and free of burrs.
• There is no shrinkage or cracking in the guide bar groove.
Warning: If the guide bar is not intact or cannot fit the chain well, there is a danger that the chain will eject out of the guide and cause
serious or even fatal injuries.
• Use only undamaged guide bars.
• Remove stains and foreign objects from the guide bar after each use of the chain saw.
Chain
The chain is safe to use if it meets the following conditions:
• The chain is not broken or damaged in any way.
• The cutting edges of the teeth are sharp.
• The cutting depth of the cutting edges of the teeth conforms to the service mark description.
• The length of the cutting edges of the teeth meets the grinding standard.
Warning: If the parts do not meet the safety standards, they will not be able to perform properly and the safety devices will fail, resulting
in serious personal injury or even death.
During operation
Cutting precautions
• Operators must concentrate on the work, otherwise they may trip or fall, leading to serious injury.
- Keep calm and work with a plan.
- Do not use the chain saw in dim areas with low visibility.
- Do not hold the chain saw above your shoulder height during operation.
- Beware of obstacles.
- While operating the chain saw, keep your balance and maintain a proper posture.
• If the workpiece is in an elevated position, use a lift or safe scaffolding.
• Do not touch the saw chain when it is in motion.
• During operation, the temperature of the chain will increase. If the chain cannot be effectively cooled and re-tensioned, the chain may eject from the guide
bar and break. This can cause serious injury and property damage.
- Ensure that the chain is properly lubricated.
- Check whether the chain is properly tensioned during operation. If the chain is not properly tensioned, adjust it.
• If the chain saw starts abnormally and runs abnormally, the chain saw may not be safe to use and can cause serious personal injury or property damage.
- Stop working and contact the supplier.
• The chain saw vibrates when it is running. Wear gloves. Take frequent breaks. If the operator suffers from a physical condition, consult a doctor.
• If the running chain hits a hard object, sparks will be generated. Sparks can cause a fire in an area with combustible materials. This can cause serious injury
and property damage. Do not use the chain saw in an area with combustible materials.
• The chain saw will continue running for a short while after the trigger is released and can cause serious injury.
- Before touching the chain, the operator must make sure that the chain saw has stopped moving completely.
Warning: If the tree is under tension, the guide bar may be pinched. The user will lose control of
the chain saw, resulting in serious injury. (Fig. 1)
• First cut a force-relief groove from the tight side (1), and then cut into the loose side (2).
Pruning precautions
• If the branches under a fallen tree are pruned first, the trunk will not be supported by the branches and may roll, causing serious or fatal injuries.
- Turn the main trunk over and then trim the branches on it.
- Do not stand on the log for trimming operations.
- Do not stand directly underneath a branch that is being cut.
Kickback warning (Fig. 2)
The following conditions may cause kickback of the chainsaw:
• During operation, the chain saw stops running suddenly due to jamming.
• During operation, the guide bar head touches any object.
Warning: If the running chain saw touches a hard object and is clamped, the operator will
lose control of the chain saw, causing serious or fatal injury.
• Grasp the chain saw handle with both hands.
• Operate the chain saw as described in the manual.
• Keep the guide bar stable when cutting.
• Use full speed when cutting.
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Fig. 1
Fig. 2