| 摘要 |
PURPOSE:To prevent the oil pressure of a hydraulic circuit from being reduced by providing a force-circulation circuit cleaning the transmission oil on a car body separately from the hydraulic circuit for lifting a work machine in an agricultural tractor using the transmission oil as the hydraulic oil concurrently. CONSTITUTION:A hydraulic pump 10 is provided on the rear side of a front drive case 8 in connection with a rear shaft, its intake port and the lower section of a rear transmission case 7 are connected with a suction pipe 11, and a discharge port and the upper section of the said case 7 are connected with a high-pressure pipe 13 having a filter 12. Thereby, the transmission oil is spattered from the high-pressure pipe 13 to the upper section in the said case 7. On the other hand, a hydraulic pump 15 is provided on a front axle bracket 5 in connection with an invariably-rotating shaft protruded in the front end of a front transmission case 2, the hydraulic pump 15 and the said case 2 are communicated with a suction pipe 6, and the discharge port of the hydraulic pump 15 and a work machine lifting valve 17 are communicated with a high-pressure pipe 18.
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