John Deere

OMM144025

Issue H0

Front Mowers

F510 and F525

PIN (120001 -)

Introduction

Product Identification

Safety

Operating

Replacement Parts

Service Intervals

Service Lubrication

Service Engine

Service Transmission

Service Steering & Brakes

Service Mower

Service Electrical

Service Miscellaneous

Troubleshooting

Using Troubleshooting Chart

Engine

Electrical

Mower

Storage

Assembly

Specifications

Warranty

John Deere Quality Statement

Service Record

Copyrightę Deere & Company

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Troubleshooting


Using Troubleshooting Chart

If you are experiencing a problem that is not listed in this chart, see your John Deere dealer for service.

When you have checked all the possible causes listed and you are still experiencing the problem, see your John Deere dealer.

Engine

IF

CHECK

Engine Will Not Start Or Hard To Start

Open fuel shutoff valve.

Push brake pedal down or lock the park brake.

Connect spark plug wire.

Replace spark plug.

Allow travel pedal to return to neutral.

Sit on the operator's seat.

Fill the fuel tank.

Drain and fill tank with the correct fuel

Drain and fill engine with the correct oil.

Put PTO switch in the off position.

Engine Overheats

Clean the cooling fins.

Add oil.

Do not operate at slow idle: Operate implement at fast idle.

Clean the air intake screen.

Replace the air cleaner element(s).

Engine Runs Rough

Replace the fuel filter.

Drain and fill the tank with the correct fuel.

Drain the fuel system. Flush dirt and add fresh fuel.

Replace air cleaner element(s).

Check electrical connections.

Replace spark plug.

Clean the cooling fins.

Clean the choke control pivot (located below the fuel pump).

Engine Lacks Power

Reduce the load.

Replace the air cleaner element(s).

Replace the fuel filter.

Drain and fill the tank with the correct fuel.

Clean the cooling fins to help prevent overheating.

Replace the spark plug.

Low Oil Light Comes On

Add oil.

Change the oil filter.

Drain and fill the engine with correct oil.

Engine Knocks

Drain the fuel tank. Fill the tank with fresh fuel with the correct

octane.

Reduce the load.

Run the engine at fast idle.

Engine Backfires

Replace the spark plug.

Engine Will Not Slow Idle

Check the spark plug gap.

Replace the spark plug.

Engine Vapor Locks

Replace the fuel filter.

Tractor Vibrates Too Much

Attachment drive belts worn or damaged.

Dirt on drive sheaves.

Tractor Will Not Move Or Moves Too Slowly With Engine Running

Transmission hydraulic oil level low.

Parking brake locked.

Free-wheeling lever pushed forward.

Tractor Moves With Engine Running And Foot Pedals In Neutral

Linkage out of adjustment.


Electrical

IF

CHECK

Starter Does Not Work Or Will Not Turn Engine

Push the brake pedal down or lock the park brake.

Push the PTO switch lever down.

Clean the battery terminals and cable ends.

Check for a blown fuse.

Check electrical connections.

Starter Turns Slowly

Low battery output.

Engine/transmission oil viscosity too heavy.

Loose or corroded connections.

Battery Will Not Charge

Dead cell in battery.

Check the electrolyte level.

Low engine speed or excessive idling.

Battery cables and terminals dirty.

Fan/alternator belt loose or damaged.

Battery Discharge Indicator Stays On With Engine Running

Low engine speed.

Defective battery.

Lights Do Not Work

Fuse blown.

Loose bulb.


Mower

IF

CHECK

Tractor Will Not Move With Engine Running Or Moves Very Slowly

Engine/transmission oil level low.

Free-wheeling lever pushed forward, not disengaging valve.

Parking brake locked.

Belt Slipping

Remove belt shields. Clean sheaves and belts.

Replace belt if it is badly worn.

Replace jacksheave post if it is badly worn.

Excessive Belt Wear

Inspect sheaves for burrs or bent rims.

Inspect bushings on jacksheave idler arm. Replace if worn.

Check for belt rubbing.

Mow near 2.5 in. height for optimum belt life.

Tractor Moves With Engine Running And Foot Pedals In Neutral

Brake linkage out of adjustment.

Belt Rubs Frame Cross Member

Deck attached incorrectly to chassis pivot bracket.

Check for damaged or dull blades.

Engine Slows Down When Mower Engaged

Slow down tractor speed.

Check for debris wrapped around spindles.

Mow at fast idle.

Drive Tires Lose Traction

Weight transfer pedal not being used correctly.

Weight transfer cable not adjusted correctly.

Inspect for worn drive tires. Replace if needed.

Install wheel weights and/or tire chains.

Too Much Vibration

Remove belt shields. Clean sheaves and belt.

Remove and balance blades.

Check for worn or damaged belt.

Patches Of Grass Uncut

Reduce travel speed.

Mow at FAST idle.

Sharpen blades.

Uneven Cut

Check tire pressure.

Reduce travel speed.

Sharpen blades.

Check to make sure mower deck is level.

Discharge Chute Plugged

Attachment drive belts worn or damaged.

Dirt on drive sheaves.