By Bernard R Kestel
The Chainsaw Operator's guide is the basic security device for all specialist and leisure clients of chainsaws. The booklet contains easy-to-follow charts, color illustrations and directions to lead chainsaw clients via uncomplicated go slicing, easy tree felling and challenge tree felling, together with laptop assisted tree felling innovations The sections of the publication correspond to the nationwide Competency criteria for chainsaw operators, which shape the foundation for accreditation in executive corporations. those criteria are noted in every one part. The 6th version has been considerably revised in accordance with new defense measures and competency criteria and likewise illustrated with new color line drawings and color pictures.
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Additional info for Chainsaw Operator's Manual: The Safe Use of Chainsaws
Example text
26 | Chainsaw Operator’s Manual Tang fits inside rims Splined hub Sawdust hole Rim sprocket The rim sprocket is mounted on a splined hub, welded to the clutch drum. This spline allows the rim sprocket to self align with the guide bar groove. The more common type of rim is now the Radial Port Rim. This sprocket uses a system of radial ports to discharge the wood chips. Level 1 Discharge holes face away from clutch drum Clutch drum Rim Splined hub Sprocket replacement To avoid sprocket problems Guide bar Sawchain • Replace when worn with a correctly pitched sprocket.
Grip the top edge of the front handle, since this will tilt the saw at the right angle for sawing the upper cut. Humbolt scarf • Frequently used in saw log operation. • Sometimes difficult to cut very low to the ground. • Can be an advantage when felling uphill. This cut provides an extra ‘step’ to prevent the tree sliding back over stump. Desired direction of fall Level 2 Other types of scarf *V scarf Desired direction of fall Simple tree felling • Fairly difficult – must match the two sloping cuts.
Keep chain correctly tensioned. • Grease bearing each fortnight or upon sprocket removal from saw. • Keep guide bar rails in good order. • Maintain a good oil flow in guide bar groove. Rim slides to align with cutter bar groove Rim Clutch drum Sprocket pitch It is important that chain and sprocket pitch are matched. The pitch of the chain is determined by measuring from the distance between 3 adjacent rivets divided by 2. This distance divided by two Chain pitch Chainsaw Operator’s Manual | 27 The cutting attachment Drive sprockets are subjected to extreme heat and friction and therefore wear.