Troubleshooting - MTD Series 770 Operator's Manual

Troubleshooting
Problem I
Cause
Remedy
Engine runs erratic
Engine hesitates at high
RPM
Uneven cut
1. Unit running with CHOKE activated.
2. Spark plug wires loose.
3. Blocked fuel line or stale fuel.
4. Vent in gas cap plugged.
5. Water or dirt in fuel system.
6. Dirty air cleaner.
1, Spark plug gap too close.
1. Deck not leveled properly.
2. Dull blade.
3. Uneven tire pressure.
1. Move the throttle contol out of the CHOKE
position.
2. Connect and tighten spark plug wire.
3. Clean fuel line; fill tank with clean, fresh
gasoline and replace fuel filter, is so equipped.
4. Clear vent or replace cap if damaged.
S. Drain fuel tank. Refill with clean, fresh
gasoline.
6. Replace air cleaner paper element or clean
foam precleaner, is so equipped.
1. Remove spark plug and reset the gap.
1. Perform side-to-side deck adjustment.
2. Sharpen or replace blade.
3. Check tire pressure in all four tires.
28