Neutral start circuit for a vehicle including a power take-off assembly
This patent describes a starting circuit adapted for use in a tractor having a transmission shiftable among Neutral and various GEAR conditions and a power take-off including a mechanically engaged, electrically held clutch. The circuit comprises: an ignition switch having separate first and second outputs and switching element movable among an OFF position, a START position for energizing both outputs and a RUN position for energizing only the first output; a start relay including a grounded start coil, a first relay input, a second relay input, a relay output and a relay switch element normally connecting the second relay input to the relay output and being responsive to energization of the relay coil for connecting the first relay input to the relay output; a power take-off switch connected between the first ignition switch output and the start coil and adapted for being closed only when the power take-off clutch is disengaged; a transmission switch connected between the second ignition switch output and the first start relay input and adapted to be closed only when the tractor transmission is in its Neutral condition; the output of the start relay being adapted for connection to a starter solenoid; and a power take-off engagement indicator lamp coupled directly to the first output of the ignition switch and the second input of the start relay and effecting, when lit, a drop in voltage sufficient to prevent energization of a starter embodying the starter solenoid adapted for connection to the start relay output. The start relay is operable to ensure that the relay output will receive sufficient voltage for effecting starting only if the power take-off and transmission switches are both closed while at the same time establishing a current path for energizing the lamp at all times when the power take-off switch is open.
- Assignee:
- Deere and Co., Moline, IL
- Patent Number(s):
- US 4651018
- OSTI ID:
- 6658896
- Resource Relation:
- Patent File Date: Filed date 12 Aug 1985
- Country of Publication:
- United States
- Language:
- English
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