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Operator’s Manual
21” Rear & Side
Discharge Mulching
Mower
Model PR-521
(11A-438C100)
IMPORTANT: READ SAFETY RULES AND INSTRUCTIONS CAREFULLY
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
applicable local or state laws (if any). If a spark arrester is used, it should be maintained in ef
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TABLE OF CONTENTS Content Page Important Safe Operation Practices................................................................... 3 Slope Gauge...................................................................................................... 6 Assembling Your Lawn Mower........................................................................... 7 Know Your Lawn Mower .................................................................................... 9 Operating Your Lawm Mower ...........
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SECTION 1: IMPORTANT SAFE OPERATION PRACTICES 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. When you see this symbol, heed its warning. WARNING: The Engine Exhaust from this product contains chemicals known to the State of
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Mow only in daylight or good artificial light. Never assume that children will remain where you Stop the blade when crossing gravel drives, walks last saw them. or roads. Keep children out of the mowing area and under the If the equipment should start to vibrate abnormally, watchful care of a responsible adult other than the stop the engine and check immediately for the operator. cause. Vibration is generally a warning of trouble. Be alert and turn mower off if a child enters the
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Never attempt to make a wheel or cutting height Mower blades are sharp and can cut. Wrap the adjustment while the engine is running. blade(s) or wear gloves, and use extra caution Grass catcher components are subject to wear, when servicing them. damage and deterioration, which could expose Do not change the engine governor setting or moving parts or allow objects to be thrown. For overspeed the engine. Excessive engine speeds safety protection, frequently check components and are da
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SECTION 2: SLOPE GAUGE Use this page as a guide to determine slopes where you may not operate the lawn mower safely. 6 USE THIS PAGE AS A GUIDE TO DETERMINE SLOPES WHERE YOU MAY NOT OPERATE SAFELY. SIGHT AND HOLD THIS LEVEL WITH A VERTICAL TREE A POWER POLE A CORNER OF A BUILDING OR A FENCE POST 15° WARNING Do not mow on inclines with a slope in excess of 15 degrees (a rise of approximately 2-1/2 feet every 10 feet). A riding mower could overturn and cause serious injury. If operating a wal
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SECTION 3: ASSEMBLING YOUR LAWN MOWER To Remove Unit From Carton Remove staples, break glue on top flaps, or cut tape Tighten at carton end and peel along top flap to open carton. hand knob Remove loose parts if included with unit (i.e., operator’s manual, etc.). Cut along corners and lay carton down flat. Remove packing material. Roll or slide unit out of Tighten hand knob carton. Check carton thoroughly for loose parts. NOTE: Parts included for assembly of grass catcher are listed
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IMPORTANT: Make sure cables are routed to the Assembling Grass Catcher outside of the handle so they are not in the way when attaching the grass catcher. NOTE: Make certain bag is turned right side out before assembling (warning label will be on the outside). Lift the rear discharge door on the mower. Place the hooks on the grass catcher into the slots Parts for Soft Grass Bag: in the handle bracket assemblies. See Figure 7. 1. Front Frame & Rear Frame Release the rear discharge door. 2.
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SECTION 4: KNOW YOUR LAWN MOWER Compare the illustration in Figure 9 with your lawn mower to familiarize yourself with the location of various controls and adjustments. WARNING: The operation of any lawn mower can result in foreign objects being thrown into the eyes, which can result in severe eye damage. Always wear safety glasses or eye shields. We recommend wide vision safety mask for over spectacles or standard safety glasses. Mulching Plug Blade Control Handle Both the mulching baffle a
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Be sure that lawn is clear of stones, sticks, wire, or To Start Engine and Engage Blade other objects which could damage lawn mower or engine. Such objects could be accidentally thrown WARNING: Never run engine indoors or in by the mower in any direction and cause serious enclosed, poorly ventilated areas. Engine personal injury to the operator and others. exhaust contains carbon monoxide, an For best results, do not cut wet grass because it odorless and deadly gas. Keep hands, feet, te
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wheels must be placed in the same relative Remove the hairpin clips from the weld pins on the position. See Figure 10. handle brackets. Press outward on the legs of the lower handle, and remove it from the mower. Turn the lower handle around so the notches on the bottom of the lower handle are facing forward as shown in Figure 11. Reassemble, placing the Height bottom holes in the handle over the weld pins in the Adjustment handle mounting bracket. Lever Reassemble the upper handle.
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NOTE: An unbalanced blade will cause excessive Engine vibration when rotating at high speeds and may cause Refer to the separate engine manual. damage to the mower and/or personal injury. The blade can be tested by balancing it on a round Lubrication shaft screwdriver. See Figure 14. Remove metal (Refer to Lubrication Chart in Figure 15.) from the heavy side until it balances evenly. It is recommended that the blade always be removed WARNING: Always stop engine and from the adapter for
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SECTION 8: OFF-SEASON STORAGE The following steps should be taken to prepare lawn Store mower in a dry, clean area. Do not store next mower for storage. to corrosive materials, such as fertilizer. Clean and lubricate mower thoroughly as described NOTE: When storing any type of power equipment in in the lubrication instructions. an unventilated or metal storage shed, care should be Refer to engine manual for correct engine storage taken to rust-proof the equipment. Using a light oil or
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SECTION 10: PARTS LIST FOR MODEL PR-521 1 12 68 69 7 82 9 11 16 83 3 2 4 13 A 6 14 29 76 57 19 4 59 79 77 20 15 71 80 53 39 40 66 22 23 18 45 72 58 21 52 30 54 56 31 46 20 A 62 76 47 50 65 81 59 80 45 45 48 67 44 76 79 63 55 43 51 41 64 32 42 44 45 40 49 59 39 17 36 76 77 46 34 33 14
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Model PR-521 Ref. Part No. Description Ref. Part No. Description No. No. 1 647-0004 Control Handle Assembly 46 738-0102 Front Axle Bolt 2 710-1205 Rope Guide 47 720-0190 Spring Lever Knob 3 720-0279 Handle Knob 1/4-20 Thd. 48 732-0417A Rear Spring Lever 4 710-1174 Curved Hd. Bolt 5/16-18 x 2" Lg. 49 14578 Height Adj. Assy. Comp. - RH 6 720-0314 Hand Knob N/I 14579 Height Adj. Assy. Comp. - LH 7 710-1270 Oval C-Sunk Mach. Scr. 50 14765 Pivot Bar R.H. 9 712-0324 Hex L-Nut 1/4-20 Thd. N/I 14766 P
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MANUFACTURER’S LIMITED WARRANTY FOR: TWO-YEAR RESIDENTIAL ONE-YEAR COMMERCIAL Proper maintenance of your Cub Cadet equipment is the owner’s responsibility. Follow the instructions in your operator’s manual for correct lubricants and maintenance schedule. Your Cub Cadet dealer carries a complete line of quality lubricants and filters for your equipment’s engine, transmission, chassis and attachments. Riding mowers, lawn tractors, garden tractors, Cub Cadet attachments and home maintenance produc
