Troy-Bilt 12168 owner manual Tine Maintenance, Maintenance Operational Interlock System

Section 5: Maintenance
Tine Maintenance	THE TWO INNER TINE
Tine Sets Should Be Inspected	SETS HAVE THICKER TINES
Regularly and Replaced When Worn
Inspect the tines every 25 hours of	This could unexpected-
operation (or at least a couple of times a	ly cause the machine to
year) for wear and general condition. If	jump backward. Also–
any tines are broken, or if you notice that	the tines must all point
tilling and cultivating do not mix the soil	inward and the two tine
as thoroughly as when the tines were	sets with the thicker
new, it’s time to inspect and perhaps	tines must be mounted
replace the tine sets. Refer to your parts	inboard, as seen in Fig.
catalog for correct part number	5-4.
information. NOTE: The tine sets with the
thicker tines must be positioned closest	ALL TINES MUST
to the transmission. The hardware	FACE INWARD AND
securing the tine sets must be tightened	TINE CUTTING EDGES
securely (8 ft-lbs.).	MUST ENTER
The tine sets must be reinstalled as	SOIL FIRST
shipped originally from the factory. The
tines are designed to rotate backward,
with their curved cutting edges entering	Fig. 5-4: All of the tines point inward. The tines are thicker on the two
the soil first. If mounted incorrectly, the
tines may tend to run along on top of the	inner sets. Tines must be mounted so each tine’s cutting edge enters
ground rather than digging in the soil.	the soil first.

Maintenance of the
Operational Interlock System
The Operational Interlock System is an		N
	M
electrical safety system that prevents the
engine from starting (or shuts the engine
off) if either of two unsafe operating
conditions were to occur: 1) while in use
as a rear tine tiller with the handlebar		O
extending over the tine hood, the interlock
will shut the engine off if the tine hood
were not securely locked in place; 2)
while in use as a front tine tiller/cultivator
with the hood removed and the
handlebars positioned over the engine,	Fig. 5-5: Location of interlock switch.	Fig. 5-6: Engine shutoff locations.
the interlock will shut the engine off if the
handlebar is swiveled more than 900	Also check the two electrical
toward the exposed tines.	connections (N and O, Fig. 5-6) on the
Keep the interlock switch area (M,	engine. The connectors must be securely
Fig.5-5) clean and free of all debris.	attached.
Inspect this location every time the
equipment is used and clean if dirty.

22