Safety Interlock System; Adjustment Procedures; Neutral Adjustment - Simplicity ZT4000 Series Manual

ZT4000 - 44" & 48" Mower Deck

SAFETY INTERLOCK SYSTEM

This unit is equipped with safety interlock switches. These
safety systems are present for your safety, do not attempt
to bypass safety switches, and never tamper with safety
devices. Check their operation regularly.
Operational SAFETY Checks
Test 1 — Engine should NOT crank if:
• PTO switch is engaged, OR
• Parking brake is not engaged, OR
• Ground speed control levers are not in the NEUTRAL
position.
Test 2 — Engine SHOULD crank if:
• PTO switch is NOT engaged, AND
• Parking brake is engaged, AND
• Ground speed control levers are locked in the NEUTRAL
position.
Test 3 — Engine should SHUT OFF if:
• Operator rises off seat with PTO engaged, OR
• Operator rises off seat with parking brake disengaged.
• Operator moves ground speed control levers out of their
neutral positions before disengaging parking brake.
Test 4 — Blade Brake Check
Mower blades and mower drive belt should come to a
complete stop within five (5) seconds after electric PTO
switch is turned off (or operator rises off seat). If mower
drive belt does not stop within five (5) seconds, see your
dealer.
NOTE: Once the engine has stopped, the PTO switch must
be turned off, the parking brake must be engaged, and
the ground speed control levers must be locked in the
NEUTRAL position after the operator returns to the seat in
order to start the engine.
WARNING
If the unit does not pass a safety test, do not operate
it. See your authorized dealer. Under no circumstances
should you attempt to defeat the purpose of the safety
interlock system.
14

Adjustment Procedures

Neutral Adjustment

If the tractor "creeps" while the ground speed control levers
are locked in NEUTRAL, then it may be necessary to adjust
the linkage rod.
NOTE: Perform this adjustment on a hard, level surface such
as a concrete floor.
1. Disengage the PTO, engage the parking brake and turn
off the engine.
2. The locking nuts (D, Figure 27) are to be used together
to turn the rod. Loosen the jam nut that locks against
the ball joint (B) and turn the linkage rod (A) to adjust.
If the machine creeps forward, turn the rod CLOCKWISE
(while standing at the rear of the machine, facing
forward), if the machine creeps backward, turn the rod
COUNTER-CLOCKWISE.
3. Lock the jam nut (B) against the ball joint (C) when
neutral is achieved.
NOTE: This adjustment should not be performed while the
machine is running. It may take several attempts to achieved
neutral, depending upon how much the machine creeps.
B
D
A
Figure 27. Neutral Adjustment (RH side shown)
A. Adjustment Linkage Rod
B. Jam Nut
C. Ball Joint
D. Locking Nuts
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