Gravely 420RX Operator's Manual page 32

Symptoms
Engine runs unevenly
Engine starts in gear
Engine stops running
Shift Selector is malfunctioning
Parking brake doesn't work
Starter cranks slowly
Probable Causes
Electrical connections are loose.
Engine cooling fins are plugged.
Throttle cable is sticking.
Choke cable is sticking.
Fuel is stale or dirty.
Fuel line or filter are plugged.
Fuel type is incorrect.
Fuel leaks into the crankcase.
Spark plug wires defective.
Spark plug is defective.
Spark plug is fouled.
Carburetor is not adjusted correctly.
Air cleaner is plugged.
Neutral switch is adjusted incorrectly.
Shifter link is out of adjustment.
Fuel tank is empty.
Spark plug wires defective.
Ignition switch is defective.
Battery is worn out or defective.
Crankshaft is broke.
Foot feed throttle spring is loose or broken.
Throttle cable is sticking.
Engine idle return spring is loose or broken.
Engine idle set too high.
Governor spring is loose or broken.
Drive Clutch does not disengaged.
Shift selector jumps out of gear.
Parking brake cable is not adjusted correctly.
Parking brake cable is broken.
Parking brake cable is jammed with debris.
Battery power is low.
Battery connections are loose or corroded.
Battery is worn out or defective.
Harness connections are loose.
Harness pin connections are bent.
Harness is defective.
Ignition switch is defective.
Starter is defective.
Engine oil is too heavy.
GB - 32
Suggested Remedies
Inspect and repair electrical connections.
Allow engine to cool. Clean cooling fins with
high pressure air.
Clean and oil throttle cable. Replace worn or
damaged cable.
Clean and oil choke cable. Replace worn or
damaged cable.
Replace fuel with new fuel.
Clean fuel line. Replace fuel filter.
Refer to engine manual.
Clean or replace fouled spark plugs.
Verify that choke is not stuck on.
Replace spark plug wires.
Replace spark plugs.
Clean spark plugs or replace.
Gravely
See your dealer.
Replace air cleaner.
Adjust neutral switch to be engaged with shift
selector in neutral.
With shift selector in neutral, adjust shifter link
at engine to be in neutral position.
Filling Fuel Tank
Refill fuel tank. See
page 23.
Replace spark plug wires.
Replace ignition switch.
Replace battery.
Gravely
See your dealer.
Reattach disconnected foot feed spring.
Replace defective spring.
Clean and oil throttle cable. Replace worn or
damaged cable.
Reattach disconnected engine idle spring.
Replace defective spring.
Gravely
See your dealer
Reattach disconnected governor spring.
Replace defective spring.
Clean drive clutch by blowing air through it.
With shift selector in neutral, adjust shifter link
at engine to be in neutral position.
Adjust parking brake cable at the caliper.
Replace parking brake cable.
Clean debris from parking brake cable.
Recharge battery.
Clean and tighten battery connections.
Replace battery.
Inspect and connect harness connections.
Straighten harness pins.
Replace harness.
Replace ignition switch.
Replace starter.
Refer to engine manual for suggested grades.
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