Comparison of Productivity of Kranman Bison 10000 Forwarder in Stands Harvested With Harvester and Chainsaw

Abstract

The aim of this study is to investigate potential uses of Kranman Bison 10000 6WD forwarder in stands, where roundwood is extracted with a chainsaw and Vimek 404 T5 harvester in normal and difficult forwarding conditions. Productivity of Kranman forwarder was compared with medium-sized John Deere 810 forwarder under normal conditions. In total 230 loads were forwarded during the study, including 63 loads from areas, harvested with a chainsaw, and 167 loads from areas, harvested with Vimek 404 harvester. The average forwarded load is 2.0 m³ (the maximum load is 2.5 m³ therefore the average load capacity is 80%). In average 33 minutes of productive work time were spent by forwarding one load (the proportion of productive working time is 94% from total engine hours of the machine). The average length of forwarding road in trials is 286 m. In normal conditions forwarding of 1 m³ of roundwood extracted with a chainsaw takes 15 minutes of productive working time, but in difficult forwarding conditions the time consumption increases by 13%. The average forwarder fuel consumption is 1.8 L per hour. Accordingly, 0.8 L of fuel are consumed to forward 1 m³ roundwood. In comparison, John Deere 810 under similar conditions consumed 1.6 L fuel to forward 1 m³ roundwood. Study results prove that the best application of Kranman Bison 10000 is forwarding small stands or individual trees logged with a chainsaw. Forwarder can work on soils with low bearing capacity, however productivity can be significantly reduced by stumps and uneven terrain.

Investigation of Structure of Technology Cycle Time of Hydraulic Manipulators in the Process of Loading Forwarders with Logs

“…Total time of loaded movements (including the capture of logs) in the obtained data takes 51-72% of the total operating time of the manipulator, which is generally consistent with the results of other studies 54-71% (Berg et al 2017, Kaleja et al 2017. There are some differences between the experimental data obtained and the results presented by Cadei et al (2020).…”

“…This technological process consists of both individual operations and special techniques that are used when performing operations. The fact is that individual manipulator operations make different contributions to the total operating time of the manipulator, which is confirmed, among other things, by the studies of Berg et al 2017 andKaleja et al 2017.…”

“…Total time of empty is 20 to 45% of the total manipulator operating time when loading the forwarder. In other studies, this time is on average 20-26% (Berg et al 2017, Kaleja et al 2017.…”

Factors affecting productivity of machined logging in thinning using small size forest machines

“…Analysing the previous experience of mechanised thinning, the potential total volume for the small size forest machines is to 117.8 thousand. ha, taking into account the previous experience of mechanised thinning in the range of tree diameter from 1 to 28 cm (Kaleja et al, 2017; Lazdiņš, Zimelis, & Spalva, 2015; Zimelis, Lazdins, & Spalva, 2017).…”

Increase of forwarding productivity and reduction of tree damages in thinning by use of loading grapple with tilt function

“…In earlier trials with standard grapple the average productivity of John Deere 810 E forwarder was 6.2 m³ per engine hour (the average hauling distance 0.8 km), and the average productivity of Logbear F4000 forwarder was 5.6 m³ per engine hour (the average hauling distance 0.3 km) [2][3][4].…”