John Deere z425 - Manual (Page 41)

Troubleshooting - 40
TROUBLESHOOTING
factory look of your vehicle’s painted surfaces.
Repairing Minor Scratches (surface scratch):
1. Clean area to be repaired thoroughly.
2. Use automotive polishing compound to remove surface scratches.
3. Apply wax to entire surface.
Repairing Deep Scratches (bare metal or primer showing):
1. Clean area to be repaired with rubbing alcohol or mineral spirits.
2. Use paint stick with factory-matched colors available from your
authorized dealer to fill scratches. Follow directions included on paint stick
for use and for drying.
3. Smooth out surface using an automotive polishing compound. Do not
use power buffer.
4. Apply wax to surface.
Troubleshooting
Using Troubleshooting Chart
If you are experiencing a problem that is not listed in this chart, see your
authorized dealer for service.
When you have checked all the possible causes listed and you are still
experiencing the problem, see your authorized dealer.
Engine
IMPORTANT: Avoid damage! Do not use rubbing compound on
painted surfaces.
IF CHECK
Poor Engine Performance Dirt in fuel system or fuel is old.
Replace fuel with fresh stabilized fuel.
Obtain fuel from another supplier
before suspecting machine problems.
Suppliers blend fuels differently and
changing suppliers will generally solve
any performance problems
Fuel blended with alcohol or ether may
contribute to performance problems by
causing gum and varnish deposits,
especially if fuel is stored for several
weeks or more. Obtain fresh fuel.
Engine Will Not Start - No
Crank Park brake not locked.
Motion control levers not in Start/
Shutdown position.
Mower is engaged.
Defective brake, mower engagement,
or key switch.
Electrical problem - See Electrical
Troubleshooting Section
Engine Cranks But Will Not
Start Spark plug wire is loose or
disconnected.
Improper fuel.
Plugged fuel filter.
Electrical problem - See Electrical
Troubleshooting Section
Engine Is Hard To Start Carburetor is not adjusted properly or
dirty.
Choke not fully closing.
Plugged fuel filter.
Faulty spark plug.
Stale or improper fuel.
Loose or corroded electrical
connections.
Engine oil viscosity.
Engine Runs Unevenly Cooling fins plugged.
Loose electrical connections.
Choke or throttle cable sticking.
Choke not fully open.
Fuel line or fuel filter plugged.
Stale or dirty fuel.
Improper fuel.
Air cleaner element plugged.
Engine Misses Under Load Faulty spark plug.
Stale or dirty fuel.
Plugged fuel filter.
Engine Vapor Locks Fuel tank vent plugged.
Dirt in fuel filter.
Cooling fins plugged.
Loose hose connection at fuel filter or
fuel pump.
Engine Overheats Engine air intake screen plugged.
Cooling fins plugged.
Engine oil low or too high.
Engine operated too long at a slow idle
speed.
Engine Will Not Idle Spark plug not gapped correctly.
Faulty spark plug.
Operator raising off the seat.
Engine Knocks Stale or low octane fuel.
Engine overloaded.
Low engine speed.
Oil level low.
Engine Stops Or Misses
When Operating On Hillsides Fuel tank less than half full of fuel.
Operator raising off of the seat.
Engine Backfires Faulty spark plug.
Operator raising off of the seat.
IF CHECK