General Troubleshooting - Toro Z MASTER 4000 Series Service Manual

General Troubleshooting

Problem
The starter does not crank
The engine does not start, starts
hard, or fails to keep running
Engine loses power
4000 Series Z MASTER® Service Manual
3442-427 Rev A
Possible Cause
The blade control switch (PTO) is
engaged.
The parking brake is not engaged.
The battery is dead.
The electrical connections are corroded
or loose.
A switch is worn or damaged.
The fuse is blown.
The fuel tank is empty.
The throttle is not in the correct position.
There is dirt in the fuel filter.
There is dirt, water, or stale fuel in the
fuel system.
The air cleaner is dirty.
The seat switch is not functioning
properly.
The electrical connections are
corroded, loose, or damaged.
The spark plug is fouled or improperly
gapped.
The ignition coil(s) have failed.
The spark plug wire is not connected.
A switch is worn or damaged.
The engine load is excessive.
The air cleaner is dirty.
The oil level in the crankcase is low.
The cooling fins and air passages
above the engine are plugged.
One of the ignition coils has failed.
The fuel tank vent system is plugged.
There is dirt in the fuel filter.
There is dirt, water, or stale fuel in the
fuel system.
Page 3–3
Corrective Action
Move the blade-control switch (PTO) to
the disengaged position.
Move the motion control levers to the
neutral lock (Park) position.
Charge the battery.
Check the electrical connects for good
contact.
Test and replace faulty switch.
Replace the fuse.
Fill the fuel tank.
Be sure that the throttle control is
always in the fast positions.
Replace the fuel filter.
Clean and flush the fuel system.
Clean or replace the air cleaner
element.
Check the seat-switch and replace if
faulty.
Check the electrical connections for
good contact. Clean the connector
terminals thoroughly with electrical
contact cleaner and apply dielectric
grease.
Adjust or replace the spark plug.
Test and replace faulty coil(s).
Check the spark plug wire connection.
Test and replace faulty switch.
Reduce the ground speed or raise
height-of-cut.
Clean or replace the air cleaner
element.
Add oil to the crankcase.
Remove the obstruction and thoroughly
clean cooling fins and the air passages.
Test and replace the faulty coil.
Inspect fuel tank vent system for
obstruction and repair system.
Replace the fuel filter.
Clean and flush the fuel system.
Troubleshooting: General Troubleshooting