Fuse; Key Switch - MTD "A" Series Professional Shop Manual

A and B series mowers

Fuse

The "A" and "B" series mowers with electric start are
equipped with a 40 amp ATO automotive blade type fuse.
The fuse is located in the battery box, on top of the
battery. See Figure 6.9.

Key switch

The key switch used on "A" and "B" series mowers is a
normally open (NO) momentary switch. This means that
the contacts inside the switch are open until the key is
turned (NO). Turning the key will close the contacts. As
soon as the key is released the contacts will open
(momentary switch).
To remove/replace the key switch:
1. Remove the key switch retaining nut.
See Figure 6.10.
2. Pull the key switch out of the mounting bracket by
the harness.
NOTE: There is an internal star washer that should
come out with the key switch.
3. Unplug the wires going to the switch.
See Figure 6.11.
4. Install the key switch by following the previous steps
in reverse order.
5. Test drive the mower before returning it to service.
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Figure 6.9
Figure 6.10
Key switch
Internal star washer
Figure 6.11
Fuse
Retaining nut