This follows on from the January issue, where simple techniques to increase productivity, reduce fuel consumption and minimise wear and tear on the carrier and processing equipment are highlighted.
Part 1 focused on the set-up and roadside processing, whilst in this issue we focus on harvesters.
Harvesting:
-
Work close – Moving the harvester closer to the standing timber speeds up the cycle time.
-
Pile by swinging – The largest log should be placed the furthest back, then swing to separate the next sort, swinging until the tree is processed. The different sorts should have the tops of the logs spaced 30 to 60 cm (1 to 2 foot) apart. After cutting the first log, the arc of the boom while swinging will provide the correct spacing between the sorts, setting the tops far enough apart for the forwarder operator to tell the difference.
-
Sort by species – When sorting multiple species, first cut as much of the primary species as possible. Pile secondary species on the opposite side of the main species. This works best when the forwarder is close behind the harvester.
-
Deposit tops evenly – Deposit the tops evenly in front of the harvester to provide a good brush mat to travel over.
-
Feed while falling – Try to start feeding while the tree is falling. This can help prevent the shock of the tree hitting the ground from being transmitted to the head and possibly damaging it, as well as speeding up cycle times.
-
Let go of large trees – When cutting oversize trees, try to let go of the tree, allowing it to fall to the ground. It can then be picked up again. This will extend the overall life of the machine as large trees place a great deal of stress on all parts of the machine when they hit the ground.
-
Sharp tools – Sharp knives allow for better delimbing which can help with measuring both diameter and length. A sharp chain reduces the occurrence of “barber chairs” when felling, and log splitting during cross cutting.
-
Open the bottom arm – If the bar becomes pinched when felling a tree, open the bottom arms (if it is possible) as this sometimes releases the bar. If the bar is not released, you may be able to swing with the bottom arm open when the tree is leaning and tear the tree from the stump. This will leave a “barber chair” but at least the bar will not be ruined. The technique is not easy, but will work when done correctly.
Source: Gary MacDonald in “Between the Branches” Nov 09 – the official publication of Tigercat Industries. www.tigercat.com