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3.

Check the blade and engine mounting bolts at frequent 
intervals for proper tightness. Also, visually inspect blade 
for damage (e.g., bent, cracked, worn) Replace blade 
with the original equipment manufacture’s (O.E.M.) blade 
only, listed in this manual. “Use of parts which do not 
meet the original equipment specifications may lead to 
improper performance and compromise safety!”  

4.

Mower blades are sharp and can cut. Wrap the blade or 
wear gloves, and use extra caution when servicing them.

5.

Keep all nuts, bolts, and screws tight to be sure the 
equipment is in safe working condition.

6.

Never tamper with safety devices. Check their proper 
operation regularly.

7.

After striking a foreign object, stop the engine, disconnect 
the spark plug wire and ground against the engine. 
Thoroughly inspect the mower for any damage. Repair 
the damage before starting and operating the mower.

8.

Never attempt to make a wheel or cutting height 
adjustment while the engine is running.

9.

Grass catcher components, discharge cover, and trail 
shield are subject to wear and damage which could 
expose moving parts or allow objects to be thrown. For 
safety protection, frequently check components and 
replace immediately with original equipment 
manufacturer’s (O.E.M.) parts only, listed in this manual. 
“Use of parts which do not meet the original equipment 
specifications may lead to improper performance and 
compromise safety!”

10. Do not change the engine governor setting or overspeed 

the engine. The governor controls the maximum safe 
operating speed of the engine. 

11. Maintain or replace safety and instruction labels, as 

necessary.

12. Observe proper disposal laws and regulations. Improper 

disposal of fluids and materials can harm the 
environment. 

Your Responsibility

Restrict the use of this power machine to persons who read, understand and follow the warnings and instructions in 
this manual and on the machine.

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Summary of Contents for PR-521

Page 1: ...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 effective workin...

Page 2: ...epartment or an authorized dealer You can locate the model number by standing in the operating position and looking down at the rear of the deck A sample model plate is explained below For future refe...

Page 3: ...n bystanders helpers and pets at least 75 feet from the mower while it is in operation Stop machine if anyone enters the area 6 Always wear safety glasses or safety goggles during operation and while...

Page 4: ...r 5 Keep children away from hot or running engines They can suffer burns from a hot muffler 6 Never allow children under 14 years old to operate a power mower Children 14 years old and over should rea...

Page 5: ...nd operating the mower 8 Never attempt to make a wheel or cutting height adjustment while the engine is running 9 Grass catcher components discharge cover and trail shield are subject to wear and dama...

Page 6: ...LY 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 walk behind mower...

Page 7: ...lower handles for shipping purposes Pull up and back on the upper handle to raise the handle into the operating position Make certain the lower handle is seated securely into the handle mounting brack...

Page 8: ...Your lawn mower is equipped with both a mulching baffle and a mulching plug While the mulching baffle is located at the rear of the mower the mulching plug is located on the right side of the cutting...

Page 9: ...g are used only for mulching purposes Instead of collecting the grass clippings in a grass catcher some mower models have the option of recirculating the clippings back to the lawn This is called mulc...

Page 10: ...To Stop Engine and Blade Release the blade control handle to stop the engine and blade WARNING The blade will continue to rotate for three seconds after the blade control lever is released Disconnect...

Page 11: ...the handle in the higher height position To lower the handle height for your convenience proceed as follows Remove the starter rope from the rope guide Remove the upper handle by removing the hand kn...

Page 12: ...he blade adapter with light oil or engine oil Also lubricate the bolt holes bolts and inner surface of the nuts Install the blade adapter on the crankshaft with the star away from the engine Refer to...

Page 13: ...with light oil Engine oil may also be used Engine Follow engine manual for instruction and schedule of lubrication NOTE When tipping the unit empty the fuel tank and keep engine spark plug side up SE...

Page 14: ...tank with clean fresh gasoline 3 Refer to the engine manual packed with your unit Engine overheats 1 Engine oil level low 2 Dirty aircleaner 3 Air flow restricted 4 Carburetor not adjusted 1 Fill cra...

Page 15: ...15 NOTES...

Page 16: ...16 NOTES...

Page 17: ...17 NOTES...

Page 18: ...1 11 9 7 82 16 15 18 3 2 19 4 6 4 31 50 48 47 44 45 64 56 20 55 63 36 34 33 32 40 39 57 59 20 45 44 43 41 42 59 23 66 67 58 30 51 53 62 65 81 49 22 72 21 14 13 12 71 52 54 39 40 29 A A 83 45 46 76 80...

Page 19: ...48 732 0417A Rear Spring Lever 49 14578 Height Adj Assy Comp RH N I 14579 Height Adj Assy Comp LH 50 14765 Pivot Bar R H N I 14766 Pivot Bar L H 51 782 5002 Front Baffle 52 710 0654A Hex L Wash Scr 3...

Page 20: ...det equipment used commercially is warranted for one year only Commercial use is defined as either having hired operators or used for income producing purposes Items not covered The warranty does not...

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