MTD 21AA405C500 User Manual

Problem Cause Remedy
Engine does not start Spark plug wire disconnected.1.
Engine Throttle Control Lever incorrectly set.2.
Fuel tank empty.3.
Stale gasoline.4.
Dirty air filter. 5.
Defective or incorrectly gapped spark plug. 6.
Carburetor out of adjustment. 7.
Misadjusted throttle control. 8.
Dirt or water in fuel tank. 9.
Reconnect wire.1.
Put lever in START position.2.
Add fuel.3.
Drain fuel and add fresh fuel.4.
Clean or replace filter (see separate Engine 5.
Manual).
Inspect spark plug (see separate Engine 6.
Manual).
Contact authorized service dealer.7.
Contact authorized service dealer.8.
Contact authorized service dealer.9.
Engine runs poorly Defective or incorrectly gapped spark plug.1.
Dirty air filter(s). 2.
Carburetor out of adjustment.3.
Stale gasoline.4.
Dirt or water in fuel tank.5.
Engine cooling system clogged.6.
Inspect spark plug (see Engine Manual).1.
Clean or replace (see Engine Manual).2.
Contact authorized service dealer.3.
Replace with fresh gasoline.4.
Contact authorized service dealer.5.
Clean air cooling system (see Engine Manual).6.
Engine overheats Engine cooling system clogged.1.
Carburetor out of adjustment.2.
Oil level is low.3.
Clean air cooling area (see Engine Manual).1.
Contact authorized service dealer.2.
Check oil level (see Engine Manual).3.
Engine does not shut off Misadjusted throttle control or ignition 1.
switch.
See separate Engine Manual or Service 1.
Dealer.
Wheels/Tines will not turn Improper use of controls.1.
Worn, broken, or misadjusted drive belt(s).2.
Internal transmission wear or damage.3.
Bolt loose in transmission pulley.4.
Review Operation section.1.
Replace or adjust belts.2.
Contact authorized service dealer.3.
Tighten bolt.4.
Tines turn, but wheels don’t Wheel Drive Pins not in WHEEL DRIVE.1.
Bolt loose in transmission pulley.2.
Internal transmission wear or damage.3.
Inserts Drive Pins properly.1.
Tighten bolt.2.
Contact authorized service dealer.3.
Wheels turn, but tines Don’t Tine holder mounting hardware missing.1.
Bolt loose in transmission pulley.2.
Internal transmission wear or damage.3.
Replace hardware.1.
Tighten bolt.2.
Contact authorized service dealer.3.
Poor tilling performance Worn tines.1.
Improper Depth Regulator setting.2.
Incorrect throttle setting.3.
Forward Drive Belt slipping.4.
Replace Tines.1.
See “Tilling Tips & Techniques.”2.
See separate Engine Manual.3.
See Service Section.4.
Troubleshooting
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MTD 21AA405C500 Specifications

General

Engine Type	4-Cycle
Engine Displacement	208cc
Number of Tines	4
Forward Speeds	1
Reverse Speeds	1
Tilling Width	18 in
Tilling Depth	8"
Weight	136 lbs
Engine	208cc MTD Engine
Tine Direction	Forward-Rotating