text: Engine coolant Operators have the responsibility to check the engine coolant level of the feller buncher before starting the engine. The coolant prevents cylinder linear erosion and pitting, and provides protection during extremely low temperature for up to -37 °C (-34 °F). It is recommended to use coolants for heavy-duty engines which are relatively low silicate ethylene glycol base. There are two forms of coolants: pre-diluted  or concentrate. Water is required to dilute the concentrated coolant with an approximate ratio of 50:50. The use of supplemental coolant addictive might be also required in the concentrated coolant in order to provide protection against corrosion. Distilled, deionised, or demineralised water is suggested for mixing the concentrated coolant because when some water compositions mix with other substances could form a precipitate, causing damage or blockage in the engine.
  Risk management approach
  During maintenance, there are common working hazards related to two main areas: working environment and exhaust system. When working on the exhaust system, be aware of the hot components around the engine. Workers could wear personal protective equipment such as safety spectacles, heat-proof gloves and safety boots. When feller buncher is elevated for service or maintenance, falls from height might happen. Related injuries could be avoided by ensuring dryness of all the walking surface, wiping any oils or other liquid substances on the floor. Also, ensure the feller buncher is parked on a level and stable ground during maintenance. When getting in and out of the machinery, workers are suggested to use three point of contact with two hands holding the handrails and one foot on a step. It is also important to provide sufficient lighting for all the working sites at all time of service.