MTD Garden Tractors User Manual page 42

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Figure 3-44.
If the blades engage without stalling the
engine, the screws on the reverse safety
switch are grounding out against the support
bracket or panel.
Correct by removing the screws that hold the
reverse safety switch to the bracket or panel.
Inspect the insulator plate for cracks or distor-
tion, which can occur if the screws are improp-
erly installed. Replace if defective.
If the engine stalls, reconnect yellow wires and
proceed to the next step.
2. Check the seat safety switch by disconnecting
both yellow wires or the harness from the
switch. See Figure 3-45.
Figure 3-45.
With the engine running, engage the cutting
deck. If the engine continues to run with the
blades engaged, the problem is with the insu-
lator plate on the seat safety switch. Inspect in
the same manner as the reverse safety switch.
Replace if defective.
Problem: PTO starts but disengages when the
switch is moved to the run position.
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1. Check the wiring at the PTO switch. See Fig-
ure 3-46.
Figure 3-46.
If correct, check voltage at PTO when blade
stops turning. If voltage is present and blades
are not turning, check the clutch air gap and
adjust, retest, and replace the clutch if the test
fails. See Figure 3-47.
Figure 3-47.
2. If voltage is not present, disconnect the wires
from the seat safety switch and the reverse
safety switch.
Operate the PTO. If it remains running, check
the safety switches for shorts or broken insula-
tor plates.
3. If the PTO doesn't operate, test the relays as
follows:
Relay one has yellow, white, and brown wires.
Relay two has red, white, and blue wires.
a. Test for voltage on relay one at the white
wire with the PTO switch in the start posi-
3-22
NOTE