John Deere z425 - Manual (Page 14)

Operating - 13
OPERATING
Testing Safety Systems
The safety systems installed on your machine should be checked before
each machine use. Be sure you have read the machine operator manual
and are completely familiar with the operation of the machine before
performing these safety system checks.
Use the following checkout procedures to check for normal operation of
machine.
If there is a malfunction during one of these procedures, do not operate
machine. See your authorized dealer for service.
Perform these tests in a clear open area. Keep bystanders away.
Testing Park Brake Switch
1. Park machine safely. (See Parking Safely in the SAFETY section.)
2. Sit on seat.
3. Unlock the park brake.
4. Try to start engine.
Result: Engine must not crank. If engine cranks, there is a problem with
your safety interlock circuit.
Testing Park Brake
1. Park machine safely. (See Parking Safely in the SAFETY section.)
2. Engage bypass valve lever.
3. Lock the park brake.
4. Try to push machine manually.
Result: Park brake must prevent machine from moving. If machine moves,
parking brake needs to be adjusted.
Testing Mower Engagement (PTO) Switch
1. Park machine safely. (See Parking Safely in the SAFETY section.)
2. Sit on seat.
3. Lock the park brake.
4. Engage the mower.
5. Try to start engine.
Result: Engine must not crank. If engine cranks, there is a problem with
your safety interlock circuit.
Testing Seat Switch
1. Park machine safely. (See Parking Safely in the SAFETY Section.)
2. First test:
a.Start engine.
b.Move throttle lever up to maximum engine speed.
c.Unlock park brake.
d.Engage mower.
e.Raise up off seat. Do not get off machine.
Result: Engine and mower blades should stop. If engine and mower
blades do not stop, there is a problem with your safety interlock circuit.
3. Second test:
a.Lock park brake.
b.Disengage mower.
c.Start engine.
d.Unlock park brake.
e.Raise up off seat. Do not get off machine.
Result: Engine should stop. If engine does not stop, there is a problem
with your safety interlock circuit.
4. Third test:
a.Disengage mower.
b.Start engine.
c.Lock park brake.
d.Raise up off seat. Do not get off machine.
Result: Engine should continue to run. If engine stops, there is a problem
with your safety interlock circuit.
Using Park Brake
Setting Park Brake
1. Press button, and raise park brake lever to lock park brake.
Releasing Park Brake
1. Press button, and lower park brake lever to unlock park brake.
c
CAUTION: Avoid injury! Engine exhaust fumes contain
carbon monoxide and can cause serious illness or death.
Do not run an engine in an enclosed area, such as a garage, even
with doors or windows opened.
Move the machine to an outside area before running the engine.
c
CAUTION: Avoid injury! Children or bystanders may
attempt to move or operate an unattended machine.
Always lock the park brake and remove the key before leaving the
machine unattended.