ISO 13772:2018 pdf free
ISO 13772:2018 pdf free.Forestry machinery一Portable chain-saws一Non-manually actuated chain brake performance
The non-manually actuated chain brake function shall be checked on a new normal production saw equipped with the shortest and longest guide bars specified in the instruction handbook, but no longer than 500 mm. Battery-powered chain-saws shall be checked with the lightest and heaviest battery packs.When tested in accordance with Clause 8, the performance of the actuation function of a non-manually actuated chain brake is considered acceptable if each of the horizontal and vertical acceleration levels (ax and ay) at which the chain brake actuates is below the appropriate threshold level as shown in Figure 1 a). b) or c) for different chain-saw tvnes and sizes.
Prepare the chain-saw for testing as follows.
a) Check that the chain-saw is in accordance with the product specification.
b) Precondition the saw by actuating the non-manually actuated chain brake ten times一for example,by dropping the saw while holding the rear handle, so that the bar tip hits a rigid, wooden surface.
c) Mount a saw-chain suitable for the guide bar and cut softwood for the time it takes to use one tank full of fuel at approximately maximum power speed (gasoline engine powered chain-saws) or for the time it takes to use one tank full of chain oil (electric-powered chain-saws). The chain brake shall not be activated during this cutting. Do not clean the chain-saw after cutting. Remove the chain with minimum disassembly and disturbance. The guide bar used for the cutting may also be, with minimum disturbance, replaced by a comparable, unused, guide bar having the same characteristics (i.e. length, bar nose radius, gauge).
d) Set the chain tension adjuster to its middle position and move the guide bar to its uppermost position, in order to eliminate play. Fasten the guide bar on the saw.
The saw chain shall not be installed and the tanks shall be empty. The throttle trigger or power switch (for electric-powered chain-saws) shall be set to its fully actiyated position.ISO 13772 pdf free download.
