Walk Behind Lawn Mower Owner/Operator Manual Models 911250 – Pro21 911252 – Pro21 911254 – Pro21 CARB ENGLISH 01283600B 1/08 Printed in USA
TABLE OF CONTENTS Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Storage . . . . . . . . . . . . . . . . . . . . . . . . . 24 Assembly . . . . . . . . . . . . . . . . . . . . . . . . 9 Troubleshooting . . . . . . . . . . . . . . . . . 25 Controls and Features . . . . . . . . . . . . 11 Service Parts . . . . . . . . . . . . . . . . . . . . 26 Operation . . . . . . . . . . . . . . . . . . . . . . . 12 Accessories . . . . . . . . . . . . . . . . . . . . . 26 Maintenance. . . . . . . . .
DEALER DELIVERY • Record Unit Model and Serial numbers here: • Record Engine Model & Serial numbers here: PRODUCT REGISTRATION The Ariens dealer must register the product at the time of purchase. Registering the product will help the company process warranty claims or contact you with the latest service information. All claims meeting requirements during the limited warranty period will be honored, whether or not the product registration card is returned.
SAFETY CAUTION: POTENTIALLY HAZARDOUS SITUATION! If not avoided, MAY RESULT in minor or moderate injury. It may also be used to alert against unsafe practices. WARNING: This cutting machine is capable of amputating hands and feet and throwing objects. Failure to observe the safety instructions in the manuals and on decals could result in serious injury or death. Slopes are a major factor related to slip and fall accidents. Operation on all slopes requires extra caution.
SAFETY DECALS AND LOCATIONS Keep safety devices (guards, shields, switches, etc.) in place and working. ALWAYS replace missing or damaged safety decals. Refer to Figure 2 for safety decal locations. OL3030 1 3 • • • • Go across slopes, not up and down. Look down and behind before and while moving backward. Do not park on a slope unless chocked or blocked. Do not allow operation of machine by untrained personnel. 2.
Complete a walk around inspection of unit and work area to understand: • work area • your unit • all safety decals. Clear work area of stones, sticks, wire and foreign objects which might be picked up and thrown. Tall grass can hide obstacles. Know the work area. Stay alert for holes, rocks, rough terrain and hidden hazards. Keep away from drop-offs, ditches, or embankments that could cause operator to lose footing or control of unit. ALWAYS be aware of traffic when operating along streets or curbs.
Check grass bag for wear, damage, and/or deterioration. Replace only with Ariens original equipment replacement parts for safety. To reduce fire hazard and overheating, keep equipment free of grass, leaves, debris or excessive lubricants. Use extra care when approaching blind corners, shrubs, trees, or other objects which may obscure vision. DO NOT mow at too fast a rate. DO NOT change engine governor setting or overspeed the engine. Do not operate mower on gravel or loose material such as sand.
Charge batteries in an open, well-ventilated area, away from spark and flames. Unplug charger before connecting or disconnecting battery. Wear protective clothing and use insulated tools. Accidental engine start up can cause death or serious injury. Except where specifically recommended, ALWAYS stop engine, remove key (electric start models), wait for moving parts to stop, allow parts to cool and disconnect spark plug wire before inspecting, servicing, adjusting or repairing unit.
ASSEMBLY CAUTION: AVOID INJURY. Read and understand the entire Safety section before proceeding. 1 CARTON CONTENTS 2 1 3 2 4 1 1. 2. 3. 4. 6 Mounting Hardware Handlebar Brace Handlebar Bracket Figure 4 3 4 5 1. 2. 3. 4. 5. 6. Mower Unit Mulch Cover Side Discharge Chute Mulch Plug Literature Pack Grass Bag NOTE: Make sure the cables (connected to the handlebar) are on the left side of the unit and that the cable routing clips do not crimp or kink the cables at the top of the handlebar.
3. Connect the engine/blade control cable to the engine. Route the z-bend cable end into engine shutoff lever as shown below. Insert the cable connector into the cable mounting bracket on the engine. Make sure the connector snaps into place securely. Kawasaki Engines 4. Fill engine crankcase with oil. See engine manual. 5. Set-up mower for bagging, side discharge or mulching. See MOWER SET-UP on page 15.
CONTROLS AND FEATURES 2 3 1 15 5 18 (911252) 4 6 14 18 (911250, 254) 7 13 8 12 17 9 11 16 10 OM3155 Figure 7 1. Handlebars 2. Wheel Drive Control 3. Engine/Blade Control 4. Throttle 5. Oil Fill/Dipstick 6. Fuel Tank and Cap 7. Air Filter 8. Primer Bulb 9. Lock Pin 10. Muffler and Muffler Guard 11. Mulch Cover 12. Cutting Height Levers 13. Grass Bag 14. Rear Door 15. Recoil Starter Handle 16. Side Discharge Chute 17. Mulch Plug 18.
OPERATION CONTROLS AND FEATURES CUTTING HEIGHT ADJUSTMENT See Figure 7 for locations. DANGER: Avoid injury from rotating blade. ALWAYS shut off engine before adjusting cutting height. WARNING: Improper operation can lead to injury. Learn what the controls do and how they work. Thoroughly read and understand entire Operator Manual. CAUTION: Both rear wheels must be set at same height or traction drive may not work properly. CAUTION: AVOID INJURY.
Rear Wheel P6 P1 1 Front Wheel 1. Lock Pin H2 H4 H6 H8 Figure 9 H1 H3 Rear Wheel H5 To change cutting height, move cutting height levers one notch at a time on each wheel to set desired height. NOTE: Each wheel on mower must be set at the same height for a level cut. H7 H9 Front Axle Bracket Figure 8 1 Front Wheel Remove the lock pin from the left front wheel and then remove the wheels and axle from the unit.
Cutting Height Range Wheel Drive Control The rear wheels have two cutting height ranges. To change the range, support the rear of the unit and then remove the rear wheels. Remove the mounting hardware from the cutting height adjuster and then turn the adjuster forward or rearward to raise or lower the cutting height range. Replace the mounting hardware and reinstall the rear wheel. See Figure 11.
MOWER SET-UP 911252 CAUTION: DO NOT operate mower unless either side discharge cover or side discharge deflector is installed. Thrown objects may cause damage or injury. Never operate unit with rear door open unless grass bag is in place. Fuel shutoff valve open. Fuel shutoff valve closed. CAUTION: If clogs or obstruction prevents grass flow, release engine/blade control and disconnect spark plug wire before attempting to clear away any clogs.
To Mulch 1. Shut off unit. 2. Remove grass bag and install side discharge cover. See Figure 13. 3. Open rear door and insert Mulchmaster plug with the beveled face to the left. Mulchmaster Plug Side Discharge Cover Figure 13 Grass Bag Removal 1. Shut off unit. 2. Lift rear door. 3. Use handle to lift bag off mounting flange. 4. Close rear door. NOTE: Empty grass bag and clean mower pan after each use. DO NOT allow grass clumps or a grass coating to collect inside of grass bag or mower pan.
STARTING AND SHUT OFF Shut Off 1. Release wheel drive control and allow unit to stop completely (self-propelled models). 2. Release engine/blade control. WARNING: Improper operation can lead to injury. Learn what the controls do and how they work. Thoroughly read and understand entire Operator Manual. MOWING TIPS See Figure 7 for all Controls and Features. NOTE: Start engine on a level surface that is free of debris. Manual Start 1.
MAINTENANCE MAINTENANCE SCHEDULE CAUTION: AVOID INJURY. Read and understand the entire Safety section before proceeding. Service Performed Before Each Use Ariens Dealers will provide any service, parts or adjustments which may be required to keep your unit operating at peak efficiency. Should engine require service, contact an Ariens Dealer or an authorized engine manufacturer's service center.
CHECK WHEEL DRIVE CONTROL (self-propelled models) Sharpen the Mower Blades CAUTION: DO NOT sharpen mower blades while on unit. An imbalanced mower blade will cause excessive vibration and eventual damage to unit. Check mower blade balance before reinstalling blades. NEVER weld or straighten bent blades. The unit must stop quickly and completely when the control is released. Adjust or repair if necessary. See WHEEL DRIVE CONTROL ADJUSTMENT (self-propelled models) on page 23.
3. Check mower blade balance. Slide mower blade on an unthreaded bolt. A balanced blade should remain in a horizontal position. If either end of mower blade moves downward, sharpen the heavy end until blade is balanced (Figure 17). 4. Install mower blade on unit. 5. Tighten the bolts to a torque of 37.5 50 lbf-ft (51-68 N•m). REPLACE OIL FILTER (KAWASAKI ENGINES) Replace oil filter every 100 hours of use or every season. 1. Change engine oil. 2. Clean around filter. 3.
CHECK MUFFLER REPLACE ENGINE/BLADE CONTROL CABLE Check muffler for debris, cracks, wear, or other damage. Every 500 hours of operation, have your authorized Ariens dealer replace the Engine/Blade Control Cable on your mower. CAUTION: Replace worn-out mufflers immediately. Continued use could result in fire or explosion. SERVICE AND ADJUSTMENTS 1 CAUTION: AVOID INJURY. Read and understand the entire Safety section before proceeding.
1 Note belt routing around idlers and belt fingers. Push belt through belt channel and install it on the engine pulley. 2 4 3 1. 2. 3. 4. Drive Belt Engine Pulley Bent Belt Finger Belt Channel Figure 20 Figure 21 To install the drive belt: IMPORTANT: Be sure the belt seats in idler and pulley grooves with the idler touching the back (flat) side of belt. 1. Install the new belt on the transmission input pulley and idlers, route it through the belt channel, and then install the belt on the engine pulley.
Check the adjustment 8. Replace the transmission cover. 9. Connect spark plug wire to the spark plug. 1. Start the engine and slowly squeeze the wheel drive control against the handlebar and then release the wheel drive control. 2. The unit should move forward as you squeeze the wheel drive control and then stop immediately and not "creep" slowly forward when you release it. ENGINE/BLADE CONTROL ADJUSTMENT NOTE: The engine/blade control has no user serviceable adjustments.
STORAGE Fuel System CAUTION: AVOID INJURY. Read and understand the entire Safety section before proceeding. IMPORTANT: NEVER spray unit with highpressure water or store unit outdoors. Store mower in a cool, dry, protected location. Cleaning Allow unit to cool. Clean unit thoroughly with mild soap and low pressure water. Brush off dirt and debris from all surfaces. Touch up all scratched surfaces to prevent rust. Matching touch-up paint is available from your Ariens Dealer.
TROUBLESHOOTING PROBLEM PROBABLE CAUSE CORRECTION Engine will not start 1. Fuel tank empty or low. Engine is difficult to restart 1. Mower clogged with grass. 1. Clear clippings from under mower. (Allow the mower to clear clippings before shutting off engine.) Cut is poor 1. Worn blade. 1. Check blade (see CHECK MOWER BLADE on page 19). 2. Raise cutting height. 2. Fuel shutoff valve closed. 3. Spark plug wire loose or off. 4. Engine/Blade control cable detached, broken, or not adjusted properly.
SERVICE PARTS Always use genuine Ariens parts to keep your mower running like new. Description Part Number Air Filter 21541000 (911252) Air Filter 08270501 (911250, 254) Spark Plug 21540800 (911252) Spark Plug 21540400 (911250, 254) Oil Filter 21540900 (911252) Blade 01137000 Drive Belt 07200114 ACCESSORIES See your authorized Ariens Dealer to add these optional accessories.
SPECIFICATIONS Model Number Description 911250 911252 911254 Pro21 Pro21 Pro21 CARB Length - in. (cm) 62.5 (158.8) Height - in. (cm) 40.6 (103.1) Width - in. (cm) 23.5 (54.6) Actual Weight - lbs (kg) 126 (57.1) 129 (58.5) 126 (57.1) Cutting Width- in. (cm) 21 (53.3) 21 (53.3) 21 (53.3) Cutting Height - in. (cm) Engine, 4 cycle 1 – 4 (2.5 – 10.4) Honda OHV Kawasaki Honda OHV Model GXV5.5 FJ180V GXV CARB 5.5 Engine Power - HP (kW) @ Max. RPM 5.5 (4.0) 6.0 (4.5) 5.5 (4.
Two-Year Limited Lawn and Garden Walk Behind Warranty This warranty statement applies only to 21-Inch Walk Behind Lawn Mowers, Wide Area Walks, Super Striper Mowers, and Power Brushes Ariens Company (Ariens) warrants to the original purchaser that Ariens and Gravely brand consumer products manufactured and sold by Ariens after December 31, 2007 will be free from defects in material and workmanship for a period of two years after the date of purchase.
Exclusions – Items Not Covered by This Warranty • • • • • Engines and engine accessories are covered only by the engine manufacturer’s warranty and are not covered by this warranty. Parts that are not genuine Ariens or Gravely service parts are not covered by this warranty.
Ariens Company 655 West Ryan Street Brillion, WI 54110-1072 920-756-2141 Fax 920-756-2407 www.ariens.
