Safety Interlock System; Engine Starting - HUSTLER Super Z Owner's Manual

Models 927558, 927566, 927921, 927939, 927947 &
927954 only — an audible alarm will sound when the
engine coolant is close to overheating.

Safety interlock system

The tractor is equipped with a safety interlock system
consisting of the park brake switches, seat switch, and deck
clutch switch.
Check tractor safety start interlock system daily, prior to
operation. This system is an important tractor safety feature.
It should be repaired immediately if it malfunctions. The
machine incorporates a separate seat switch which will stop
the tractor engine when the operator is unseated for any
reason while the tractor is operating. This is a safety feature
designed to prevent runaway or accidental entanglement. To
inspect the system:
1. The operator must be on the seat when testing the seat
switch.
2. Set both control levers in the park brake position.
3. Start the engine and allow it to warm up to operating
temperature.
4. With the deck clutch switch down and the control
levers in the park brake position, slowly raise off of the
seat. The engine should continue to run.
5. With the deck clutch switch up and/or the control
levers in the neutral position, slowly raise off of the
seat. The engine should stop.
6. If the engine fails to stop when the deck clutch switch
is up or one or both of the control levers is up and the
operator is off the seat, check the function of the seat
switch. If the seat switch is not operating properly (is
not opening or closing) and if the cause can not be
determined, replace the seat switch.
If the problem can not be located, contact your Hustler
Dealer.
WARNING: The safety interlock system should
always function per steps 4 and 5. If it does not
function properly, it should be corrected
immediately. Do not operate machine without
properly functioning seat safety switch.

Engine starting

The Hustler Z safety start interlock system is also
designed to protect the operator and others from accidental
injury due to unintentional engine starting. The engine
starting motor will not engage until:
A. Control levers are in the park brake position.
B. Deck clutch switch is in the down (OFF) position.
WARNING: The safety interlock system must
not be disconnected or bypassed.
NOTE: The operator's seat is equipped with a separate
safety switch. If for any reason the operator should become
unseated when the brake switches are disengaged or the
deck clutch switch is engaged the engine will stop.
The following steps are the correct procedures for
starting the engine. If difficulty is encountered, contact the
375527_0406
Bypass valve
Super Z shown
Hustler Dealer in your area.
1. Before starting tractor each day, perform daily pre-
operation checking.
2. Make sure the control levers are in the park brake
position and deck clutch switch is disengaged.
3. Use choke when engine is cold, or if warm engine fails
to start within 5 seconds of cranking. Avoid flooding
and operate engine without choking as soon as
possible.
NOTE: There is no choke control on Models 927053,
927061, 928010, 928028 & 928036 proceed to Step 4.
4. Set throttle at approximately 1/2 open position.
5. Insert key in ignition switch and rotate full clockwise
to engage starting motor. Release key when engine
starts.
IMPORTANT: The engine starter should not be
operated for periods longer than 30 seconds at a time. An
interval of at least two minutes should be allowed between
such cranking periods to protect the starter from overheating
and burn-out.
6. Perform test to make sure safety start interlock system
is operating properly. Refer to Safety start interlock
system section.
7. As soon as engine begins to run, check to make certain
the oil warning light is off. If not, stop engine
3-3
H H u u s s t t l l e e r r Z Z s s h h o o w w n n
Figure 3-7
Bypass valve
Figure 3-8