Page 1
Operator’s Manual 21” Self Propelled Mulching Mower Model No. 12A-559K401 IMPORTANT: Read safety rules and instructions carefully before operating equipment. Warning: This unit is equipped with an internal combustion engine and should not be used on or near any unimproved forest- covered, brush-covered or grass-covered land unless the engine’s exhaust system is equipped with a spark arrester meeting...
SECTION 1: MAINTAINING SAFE OPERATION PRACTICES WARNING: THIS SYMBOL POINTS OUT IMPORTANT SAFETY INSTRUCTIONS WHICH, IF NOT FOLLOWED, COULD ENDANGER THE PERSONAL SAFETY AND/OR PROPERTY OF YOURSELF AND OTHERS. READ AND FOLLOW ALL INSTRUCTIONS IN THIS MANUAL BEFORE ATTEMPTING TO OPERATE YOUR LAWN MOWER. FAILURE TO COMPLY WITH THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.
DO NOT: • The blade control handle is a safety device. Never attempt to bypass its operation. Doing so makes • Do not mow near drop-offs, ditches or the safety device inoperative and may result in embankments. The operator could lose footing or personal injury through contact with the rotating balance.
Page 5
• Before cleaning, repairing, or inspecting, make certain the blade and all moving parts have stopped. • After striking a foreign object, stop the engine, Disconnect the spark plug wire, and keep the wire remove the wire from the spark plug, and thoroughly away from the spark plug to prevent accidental inspect the mower for any damage.
SECTION 3: HARDWARE PACK Please identify each piece of the hardware pack as Figure 1 shown in Figure 1. Wing Nut 1/4-20 (2) Carriage Bolt 1/4-20 (2) SECTION 4: UNPACKING Removing Unit From Carton • Roll or slide unit out of carton. Check carton thoroughly for loose parts.
Page 8
• Raise the upper handle in the direction shown in Figure 3 (step 3). Tighten the wing nuts which are Cable Tie already on the handle. See Figure 4. Upper Handle Lower Lower Handle Handle Tighten wing nut Figure 6 Figure 4 Attaching Starter Rope NOTE: Make sure to route the cables inside the lower...
NOTE: Make sure that the cables are routed to the outside of the handle and out of the way when attaching Lift discharge door the grasscatcher. • Place the hooks of the grasscatcher into the slots in the handle bracket assemblies on both sides. See Figure 9.
Starter Rope The blade control handle is located on the upper handle of the mower. The blade control handle must be The starter rope is attached to the handle. Stand behind depressed in order to operate the unit. Release the the unit and pull the starter rope to start the unit.
Starting Engine • For best results, do not cut wet grass because it tends to stick to the underside of the mower, preventing proper discharge of grass clippings, and WARNING: Be sure no one other than the could cause you to slip and fall. New grass, thick operator is standing near the lawn mower grass or wet grass may require a narrower cut.
SECTION 8: MAINTAINING YOUR LAWN MOWER WARNING: Always stop the engine and • Service foam filter in the air cleaner every 25 hours disconnect the spark plug wire before of use and replace the paper filter component every performing any maintenance work or 100 hours.
SECTION 9: SERVICE Blade Care • Secure the blade to the assembly with two hex bolts and lock nuts. Tighten the hex bolts to the Periodically inspect the blade adapter and pulley for recommended torque. Refer to ‘Blade Mounting cracks, especially if you strike a foreign object. Replace Torque’...
Page 14
• Loosen the center hex bolt and lower the blade and • Reassemble in reverse order with new belt (part # engine pulley until there is adequate clearance to 754-0465). NOTE: Begin idler reassembly by move the belt past the belt keeper. inserting bolt up through the idler bracket hole.
Adjusting Handle Height An adjusting plate and thumb lever at each wheel position provides cutting height adjustment. Each Your mower is shipped with the handle in the higher adjusting plate has nine height positions. Height of cut height position. To lower the handle height, proceed as will be changed when the thumb lever is moved from follows.
SECTION 10: OFF-SEASON STORAGE Engine Prepare your lawn mower for storage at the end of the season or if the unit will not be used for 30 days or • Follow recommendations in the accompanying more. Store the mower in a clean, dry area. engine manual for off-season storage of the engine.
SECTION 11: TROUBLE-SHOOTING GUIDE PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION Engine fails to start 1. Blade control handle disengaged 1. Engage blade control handle 2. Spark plug wire disconnected 2. Connect wire to spark plug 3. Fuel tank empty, or stale fuel 3.
Page 22
MODEL 559K Ref. No Part No. Description Ref. No Part No. Description 712-3025 Hex Jam Nut 5/16-24 732-0708 Bearing Retainer 736-0425 Bell Washer .325 x .930 x .045 741-0604 Bearing Sleeve .50 I.D. 756-1042 Pulley, 3.82 x .313 x .68 748-0355 Bearing Support 736-0425...
Page 23
MANUFACTURER’S LIMITED WARRANTY FOR: c. Routine maintenance items such as lubricants, filters, The limited warranty set forth below is given by MTD blade sharpening and tune-ups, or adjustments such PRODUCTS INC (“MTD”) with respect to new merchan- as brake adjustments, clutch adjustments or deck dise purchased and used in the United States, its posses- adjustments;...