| 摘要 |
A PTO lever 10 operates a PTO valve via a link (24) and the PTO drive is disengaged and engaged in positions (10) and (10A) respectively. The valve is biased to disengage the drive (arrow 24A) but is held engaged by hydraulically , biased detend balls so that there is automatic disengagement if hydraulic pressure is lost. To prevent inadvertent knocking of the lever (10) to engaged, e.g. when it is mounted through the dashboard (16) on the offside of the steering wheel, its pivot hole (26) is slotted and a tension spring (28) pulls a roller (42) on the lever into a slot (40) in a fixed sector (36) when the lever is disengaged. To select engaged the lever has to be pulled out to position (10B) before it can be swung up to position (10A). Free automatic return to disengaged on loss of pressure is not impeded because the roller (42) runs freely on the edge (38) of the sector (36). |
