Abstract
We carried out the performance tests for Komatsu WD45 wheel tractor on the grass land (A) and the field (B) at Shin-den-baru (Kyushu), where the soils were very hard clay. The results obtained were as follows.
1. Coefficient of adhesion on the grass land ……0.835
2. Practical maximum drawbar pull on the grass land……1600kg at 20% slippage ……1800kg at 26% slippage.
3. Max. tractive efficiency on the grass land……about 71%
4. It is able to pull a mounted type single standard subsoil plow (Pan-breaker) at a penetration of 43cm on the grass land under 1st, gear operation (0.76m/sec).
Efficiency is 0.44ha/hr, and fuel consumption is about 1.6lt./10a, however the each intervals between adjoining penetration are about 2m.
5. On the grass land, a slippage of the rear wheels becomes 20% at a penetration of about 39cm, however about 40% at a max, allowable penetration of 48.5cm.
6. Plowing efficiency, under pulling 2 bottom 14″ integral-mounted moldboard plow on the field B, is 0.196ha/hr., 3lt/10a fuel consumption, at a depth of 24cm under 1st, gear operation. However under 2nd. gear operation, efficiency is 0.313ha/hr, about 2.8lt/10a fuel consumption, at a depth of 22cm.
7. Efficiency of rotary pulverizer (power-take-off driven, 185cm wide, 48 tines attached) is 0.46ha/hr, about 1.7lt/10a fuel consumption, under 1st gear operation. However under 2nd. gear operation, it was hard work for WD 45 wheel tractor to drive the rotary pulverizer continuously.
