Page 2 - READ THIS INFORMATION; ful hints to get you started.; Fueling; Cold Starting vs. Warm Starting; Flooded Engine; RUN
2 3 READ THIS INFORMATION Before you use your new trimmer/brushcutter, read the following help- ful hints to get you started. Fueling DANGER: Gasoline is extremely flammable and explosive. A fire or explosion from gasoline will burn you and others. 1. Obtain a clean container that is approved for us...
Page 4 - Introduction; Signal Word
4 5 Introduction Thank you for purchasing a Ryobi product.We would like for you to be completely satisfied with your new product, so feel free to contact an authorized service dealer for help with service, genuine Ryobi parts, or other information you may require.Whenever you contact an authorized s...
Page 5 - injury as well as damage to the product.; Safety Rules
4 5 This product has been designed and manufactured to meet or exceed the requirements of the current version of ANSI B175.3, safety requirements for gasoline-powered string trimmers and brushcutters.■ Physical Condition of the Operator. Do not operate this product when tired, ill, or under the infl...
Page 6 - Save these instructions.; Symbols
6 7 Symbols This engine is equipped with a spark arrester muffler. It is a violation of California Public Resource Code Section 4442 to use or operate this engine without a spark arrester muffler on any forest-covered, brush-covered, or grass- covered land. Other states or federal areas may have sim...
Page 7 - SAVE THESE INSTRUCTIONS
6 7 Symbols SERVICE Servicing requires extreme care and knowledge and should be performed only by a qualified service technician. For service we suggest you return the product to your nearest AUTHORIZED SERVICE CENTER for repair. When servicing, use only identical replacement parts. WARNING: To avoi...
Page 8 - Product Labels; Replace damaged or lost labels
8 9 Product Labels Product Labels Product labels and instructions are easily visible to the operator and are located near any area of potential danger. Replace damaged or lost labels . Part No. 986178-001 Part No. 984032-001 50' 15m Part No. 985102-001 50' 15m Part No. 984105-001 50' 15m Part No. 98...
Page 9 - Features; Product Specifications; Know Your Trimmer/Brushcutter
8 9 Features Product Specifications Engine 25.4 cc Full Crank Cutting Width Model No. ZR51950A 17 in. Model No. ZR51970A 18 in. Model No. ZR51990A 8 in. for brushcutter, 18 in. for trimmer Line Size .095 in. Weight Model No. ZR51950A 12-1/2 lbs. Model No. ZR51970A 13-1/2 lbs. Model No. ZR51990A 13-1...
Page 10 - Straight Shaft Trimmer; Brushcutter
10 11 Figure 1 Features Barrier Bar Brushcutter Guard Shoulder Strap Trigger Handle Blade Straight Shaft Trimmer (Model No. ZR51970A) Front Handle Engine Trigger Handle Curved Shaft Grass Deflector Grass Barrier Engine Trigger Handle Curved Shaft Trimmer (Model No. ZR51950A) Front Handle Straight Sh...
Page 11 - Unpacking; Packing List
10 11 Unpacking ■ Carefully remove the product from the box.■ Inspect the product carefully to make sure no breakage or damage occurred during shipping. ■ Do not discard the packing material until you have carefully inspected and satisfactorily operated the prod- uct. ■ If any parts are damaged or m...
Page 12 - Attaching the Front Handle
12 13 Connecting the Attachment to the Upper Shaft See Figure 2. Follow these steps to connect the attachment to the upper shaft. 1. Loosen the knob by turning it counterclockwise. 2. Remove the end cap from the attachment shaft. 3. Align the button on the attachment shaft with the guide recess on t...
Page 13 - Attaching the Grass Deflector; The line cutting blade on the grass deflector
12 13 Attaching the Grass Deflector Attaching the grass deflector differs depending on the type of trimmer: curved shaft or straight shaft. WARNING: The line cutting blade on the grass deflector is sharp. Avoid contact with the blade. Failure to avoid contact can result in serious personal injury. N...
Page 15 - Converting From Trimmer To Brushcutter
14 15 Converting From Trimmer To Brushcutter Model No. ZR51990A To convert from the trimmer to the brushcutter, remove the trimmer head assembly, remove the grass deflector, attach the brushcutter guard, and install the blade. To Remove the Trimmer Head Assembly and Grass Deflector See Figures 10 an...
Page 16 - Mixing the Fuel; Filling the Tank; Applications
16 17 Mixing the Fuel DANGER: Gasoline is extremely flammable and explosive. A fire or explosion from gasoline will burn you and others. This product is powered by a 2-cycle engine and requires pre- mixing gasoline and 2-cycle oil. The oil mix should be 50:1, using oil that meets or exceeds JASO-FC ...
Page 17 - Starting/Stopping the Product
16 17 WARNING: The product may throw objects during opera- tion, causing injury to the operator or to by- standers. Always wear suitable eye protection, long heavy pants, and boots while operating the product. Starting/Stopping the Product See Figure 14a, Figure 14b, Figure 14c and Figure 15. To sta...
Page 18 - Operating the Trimmer; Always hold the string trimmer away from the; PROPER OPERATING
18 19 Operating the Trimmer Operating the trimmer differs, depending on whether you are using the curved shaft trimmer or the straight shaft trimmer. WARNING: Always hold the string trimmer away from the body, keeping clearance between the body and the product. Any contact with the housing or string...
Page 20 - Maintenance; Emissions Maintenance Schedule; road engine repair establishment or individual.; Replacing the Cutting Line; Do not wind the line beyond the
20 21 WARNING: When servicing, use only Ryobi replacement parts. Use of any other parts may create a haz- ard or cause product damage. Cleaning the Product ■ Stop the product before cleaning.■ Clean the exterior of the product with a damp cloth.■ Avoid using solvents when cleaning plastic parts. Mos...
Page 21 - Replacing the Spool
20 21 Figure 20 Replacing the Spool See Figure 21. Note: For best performance, use only Ryobi spools (Part No. AR04118). The spool may wear during normal use of the line advance feature and may require occasional replace- ment. Replacement spools are available through your Ryobi retailer. 11. Repeat...
Page 22 - Checking the Fuel Cap; Cleaning the Air Filter; Replacing the Spark Arrester
22 23 Checking the Fuel Cap WARNING: A leaking fuel cap is a fire hazard and must be replaced immediately. The fuel cap contains a non-serviceable filter and check valve. A clogged fuel filter causes poor engine performance. If performance improves when the fuel cap is loosened, the check valve may ...
Page 23 - Replacing the Spark Plug; Storing the Product
22 23 Replacing the Spark Plug See Figure 24. All model numbers included in this manual use an NGK BPMR7A or Champion RCJ-6Y spark plug. Use an exact replacement and replace annually. 1. Remove the spark plug boot. 2. Loosen the spark plug by turning it counterclockwise with a socket. 3. Remove the ...
Page 25 - Warranty; LIMITED WARRANTY STATEMENT
24 25 Warranty Warranty LIMITED WARRANTY STATEMENT Ryobi Technologies, Inc. warrants to the original retail purchaser that this Ryobi Technologies, Inc. product is free from defect in material and workmanship and agrees to repair or replace, at Ryobi Technologies, Inc.’s discretion, any defective pr...
Page 26 - RYOBI TECHNOLOGIES, INC. LIMITED WARRANTY FEDERAL AND CALIFORNIA; THE FOLLOWING CALIFORNIA AIR RESOURCES BOARD
26 27 Warranty Warranty RYOBI TECHNOLOGIES, INC. LIMITED WARRANTY FEDERAL AND CALIFORNIA EMISSION CONTROL SYSTEMS NON-ROAD AND SMALL OFF-ROAD ENGINES The U.S. Environmental Protection Agency (EPA), the California Air Resources Board (CARB), and Ryobi Technologies, Inc. are pleased to explain the Emi...
Page 27 - THIS PRODUCT WAS MANUFACTURED WITH A CATALYST MUFFLER
26 27 EMISSIONS MAINTENANCE SCHEDULE AND WARRANTED PARTS LIST Emissions Parts Inspect Before Clean Every Replace Clean Every Replace Every Each Use 5 Hours Every 25 Hours 25 Hours 50 Hours or Yearly or Yearly CATALYTIC MUFFLER ASSEMBLY ...................................................................
