John Deere z425 - Manual (Page 42)

Troubleshooting - 41
TROUBLESHOOTING
Electrical
Machine
Mower
Engine Loses Power Engine overheating.
Too much oil in engine.
Dirty air cleaner.
Faulty spark plug.
Travel speed is too fast for conditions.
Improper fuel.
Excessive Fuel Consumption Choke is not fully open.
Black Exhaust Smoke Air filter is dirty or oil soaked.
IF CHECK
Starter Does Not Work Or
Will Not Turn Engine Park brake not locked.
Mower is engaged.
Battery terminals are corroded.
Battery not charged.
Motion control levers not in Start/
Shutdown position.
Blown fuse.
Defective key switch
Battery Will Not Charge Dead cell in the battery.
Blown charging fuse.
Battery cables and terminals are dirty.
Low engine speed or excessive idling.
Lights Do Not Work Light plug disconnected.
Loose or burned out bulb.
Blown headlight fuse.
IF CHECK
Machine Vibrates Too Much
Or Rattles Excessively Attachment drive belts worn or
damaged.
Mower blades not balanced.
Traction drive belt damaged or worn.
Dirt on drive sheaves.
Machine Will Not Move With
Engine Running Transmission hydraulic oil level low.
Transmission belt broke.
Bypass valve levers are engaged
(Z225).
Bypass valves are in open position
(Z425 and Z445).
Machine Moves With Engine
Running And Hydrostatic
Control In Neutral Linkage out of adjustment.
Transmission neutral out of adjustment.
Mower Lift Will Not Latch in
Transport Deck is adjusted too high.
IF CHECK
IF CHECK
Discharge Chute Plugged Travel speed too fast.
Grass too long.
Grass too wet.
Engine rpm not at mow position.
Restricted air flow.
Belt installed incorrectly.
Adjust cutting height to remove only
1/3 of grass at a time.
Patches Of Grass Uncut Travel speed too fast.
Engine rpm not at mow position.
Mower deck needs cleaning.
Belt Slipping Debris in sheaves.
Worn belt.
Belt tension is incorrect.
Too Much Vibration Debris on mower deck or in
sheaves.
Damaged drive belt.
Damaged sheaves or sheaves out of
alignment.
Blades out of balance.
Front Tires Vibrate Set front tire pressure to 10 psi. If
vibration continues, reduce tire
pressure by 1 psi until vibration
stops. Do not reduce tire pressure
below 6 psi.
Blades Scalping Grass Cutting too low.
Mower wheels not adjusted
correctly.
Turning speed too fast.
Ridges in terrain.
Rough or uneven terrain.
Low tire pressure.
Mower Loads Down Tractor Engine rpm too low.
Travel speed too fast.
Debris wrapped around mower
spindles.
Adjust cutting height to remove only
1/3 of grass at a time.
Uneven Cut Mower deck not leveled properly.
Travel speed too fast.
Blades dull.
Mower wheels not adjusted
correctly.
Tire pressure unequal.
Adjust cutting height to remove only
1/3 of grass at a time.