John Deere stx38 - Manual (Page 136)

4 - 52
3/21/97
CIRCUIT OPERATION AND DIAGNOSIS ELECTRICAL
PTO CIRCUIT OPERATION
STX30 & STX38 (SN —210000)
Function:
To provide power to energize the PTO clutch.
Operating Conditions:
The key switch must be in the run position and the PTO
switch must be ON.
Theory of Operation:
The PTO circuit uses the ignition circuit to stop the
engine if the operator gets off the seat with the PTO
engaged.
Current flows from the battery (G1) positive terminal to
the fusible link or circuit breaker (F1) and key switch
(S1) battery terminal. With the key switch in the RUN
position, current flows to the PTO switch (S2). When
the PTO switch is moved to the ON position, current
flows through the PTO switch terminals B and A and
energizes the PTO clutch (Y1).