Scag Power Equipment SFC-21-4GX Operator's Manual
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Scag Power Equipment SFC-21-4GX Operator's Manual

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Congratulations on owning a Scag mower! This manual contains the operating
instructions and safety information for your Scag mower. Reading this manual
can provide you with assistance in maintenance and adjustment procedures to
keep your mower performing to maximum efficiency. The specific models that
this book covers are listed on the inside cover. Before operating your machine,
please read all the information enclosed.
© 2023
Scag Power Equipment
Division of Metalcraft of Mayville, Inc.
OPERATOR'S
MANUAL
Models: SFC-21-4GX
SFC-21-5CV
SFC-21-7CV
PART NO. 03539
PRINTED 01/23
PRINTED IN USA

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Summary of Contents for Scag Power Equipment SFC-21-4GX

  • Page 1 OPERATOR’S MANUAL Models: SFC-21-4GX SFC-21-5CV SFC-21-7CV Congratulations on owning a Scag mower! This manual contains the operating instructions and safety information for your Scag mower. Reading this manual can provide you with assistance in maintenance and adjustment procedures to keep your mower performing to maximum efficiency. The specific models that this book covers are listed on the inside cover.
  • Page 2 CONCERN, PRUDENCE, AND PROPER TRAINING OF THE PERSONNEL INVOLVED IN THE OPERATION, TRANSPORT, MAINTENANCE, AND STORAGE OF THE EQUIPMENT. This manual covers the operating instructions and illustrated parts list for: SFC-21-4GX with a serial number of W5000001 to W5099999 SFC-21-5CV...

  • Page 3: Table Of Contents

    Table of Contents Table of Contents SECTION 1 - GENERAL INFORMATION ...................1 1.1 INTRODUCTION ............................1 1.2 DIRECTION REFERENCE .........................1 1.3 SERVICING THE ENGINE AND DRIVE TRAIN COMPONENTS ............1 1.4 ASSEMBLY INSTRUCTIONS ........................2 1.5 SYMBOLS ..............................3 SECTION 2 - SAFETY INFORMATION ..................4 2.1 INTRODUCTION ............................4 2.2 SIGNAL WORDS ............................4 2.3 BEFORE OPERATION CONSIDERATIONS ....................4...
  • Page 4 Table of Contents SECTION 5 - TROUBLESHOOTING CUTTING CONDITIONS ..........19 SECTION 6 - ADJUSTMENTS ....................22 6.1 SELF-PROPEL DRIVE ADJUSTMENTS ....................22 6.2 THROTTLE CONTROL AND CHOKE ADJUSTMENTS ............... 24 6.3 TRANSMISSION DRIVE BELT ........................24 6.4 BLADE CONTROL BAR CABLE ADJUSTMENT .................24 6.5 CUTTER DECK ADJUSTMENTS ......................25 SECTION 7 - MAINTENANCE ....................26 7.6 MAINTENANCE CHART - RECOMMENDED SERVICE INTERVALS ..........

  • Page 5: Section 1 - General Information

    A D V E R S E LY A F F E C T T H E P E R F O R M A N C E , at the time of approval for printing. Scag Power Equipment DURABILITY OR SAFETY OF THIS PRODUCT.

  • Page 6: Assembly Instructions

    Section 1 1.4 ASSEMBLY INSTRUCTIONS 4. The engine installed on this mower is shipped "dry" from the factory. Add the recommended amount of oil to the engine per the engine operator's 1. In an open area, remove the grass bag, hardware manual supplied with this mower.

  • Page 7: Symbols

    Section 1 1.5 SYMBOLS SYMBOL DESCRIPTION SYMBOL DESCRIPTION Choke Transmission Parking Brake Spinning Blade 48071S On/Start Spring Tension on Idler Off/Stop Falling Hazard Thrown Object Hazard Fast Slow Continuously Variable - Linear Cutting Element - Basic Symbol Pinch Point Cutting Element - Engage 481039S Hour meter/Elapsed Operating Hours Cutting Element - Disengage...

  • Page 8: Section 2 - Safety Information

    EACH EMPLOYEE THAT HAS READ THE MANUAL. CAUTION A replacement manual is available from your Authorized Scag Power Equipment Dealer or by contacting Scag Power Equipment, Service Department at P.O. Box 152, Mayville, WI 53050 or contact us via the Internet at www.

  • Page 9: Testing The Blade Stop System

    Contact 12. DO NOT start the engine until any spilled fuel has your local Authorized Scag Power Equipment been cleaned up or has evaporated. Dealer immediately to have the blade stop system 13.

  • Page 10: Operation Considerations

    Contact 4. Position the machine next to a patch of grass and your local Authorized Scag Power Equipment approximately 3" away. See Figure 2-1. Dealer immediately to have the blade stop system repaired.

  • Page 11: Maintenance Considerations And Storage

    Section 2 WARNING DANGER DO NOT use your hand to dislodge the clogged DO NOT run the engine inside a building or discharge chute. Use a stick or other device to a confined area without proper ventilation. remove clogged material after the engine has Exhaust fumes are hazardous and contain carbon stopped running and the blade has stopped monoxide which can cause brain injury and death.

  • Page 12: Using A Spark Arrestor

    Section 2 5. Do not change the engine governor settings or overspeed the engine. See the engine operator's manual for information on engine settings. 6. To reduce fire hazard, keep the cutting units, drives, muffler and engine free of grass, leaves, excessive grease, oil and dirt.

  • Page 13: Safety And Instructional Decals

    Section 2 487489 DANGER DANGER Avoid injury from burns - Shut off engine - Allow to cool several minutes - Remove cap slowly - Do not overfill 485667 484803 2023 SFC21 Safety Decals...

  • Page 14: Section 3 - Specifications

    Section 3 SPECIFICATIONS 3.1 ENGINE General Type ....................Heavy Duty Industrial/Commercial Gasoline Model: Scag Model SFC-21-4GX ........................HONDA GXV160 Scag Model SFC-21-5CV ....................Kohler Command Pro CV173 Scag Model SFC-21-7CV ....................Kohler Command Pro CV224 Displacement: HONDA GXV160 ..............................163cc Kohler Command Pro CV173 ..........................173cc Kohler Command Pro CV224 ..........................224cc...

  • Page 15: Weights And Dimensions

    Section 3 3.5 WEIGHTS AND DIMENSIONS Length w/handle in lowest position ........................68-1/2" Length w/handle in highest position ........................... 63" Length w/handle in storage / transport position ......................41" Tracking Width ..............................21-1/4" Overall Width ................................ 23-1/4" Lowest Operating Height ............................32-3/4" Max Operating Height ............................

  • Page 16: Section 4 - Operating Instructions

    Section 4 OPERATING INSTRUCTIONS 1. Recoil Start (Figure 4-1). The recoil start is used to WARNING start the engine. 2. Blade Control Bar (Figure 4-1). Use to engage and disengage the cutter blade drive system. Do not attempt to operate this mower unless you Pulling the control bar will engage the cutter blades.

  • Page 17: Testing The Blade Stop System

    Contact your local Authorized Scag Power Equipment Dealer immediately to have the blade stop system repaired. 7. Shut the engine off and wait for all moving parts to...

  • Page 18: Initial Run-In Procedures

    Contact the engine is cold, choke the engine as needed by your local Authorized Scag Power Equipment moving the throttle / choke control lever fully forward Dealer immediately to have the blade stop system past the detent.

  • Page 19: Ground Travel

    Section 4 3. Slowly pull starter handle until just past To travel forward with the mower, slowly pull upward on the compression-STOP! Return starter handle then drive control bar. The further the drive control bar is pulled firmly pull straight out to avoid excessive rope wear upward the greater the forward speed will be.

  • Page 20: Slope Operation

    Section 4 2. To prevent tipping or loss of control, do not start or stop suddenly, avoid unnecessary turns and travel at reduced speed. If tires lose traction, disengage the blade and proceed slowly off the slope. 3. Avoid sudden starts when mowing on slopes. 4.

  • Page 21: Removing Clogged Material

    Section 4 4.10 REMOVING CLOGGED MATERIAL 5. Keep mower and discharge chute clean. 6. When mowing wet or tall grass, mow the grass twice. Raise the mower to the highest setting for DANGER the first pass and then make a second pass to the desired height.

  • Page 22: Adjusting Cutting Height

    Section 4 4.13 ADJUSTING CUTTING HEIGHT The mower deck can be adjusted from a height of 1-1/2 inches to 4-1/2 inches at 1/2-inch intervals. To adjust the cutting height: WARNING DO NOT adjust the cutting height with the mower blade rotating. Disengage the power to the cutter blades and then adjust cutting height.

  • Page 23: Section 5 - Troubleshooting Cutting Conditions

    Section 5 TROUBLESHOOTING CUTTING CONDITIONS CONDITION CURE CAUSE STRINGERS - OCCASIONAL Low engine RPM Run engine at full RPM BLADES OF UNCUT GRASS Ground speed too fast Slow speed to adjust for conditions Wet grass Cut grass after it has dried out Dull blades, incorrect sharpening Sharpen blades Deck plugged, grass accumulation...
  • Page 24 Section 5 TROUBLESHOOTING CUTTING CONDITIONS (CONT'D) CONDITION CAUSE CURE U N E V E N C U T O N F L AT Lift worn from blade Replace blade GROUND - WAVY HIGH-LOW APPEARANCE, SCALLOPED Blade upside down Mount with cutting edge toward ground CUT, OR ROUGH CONTOUR Deck plugged, grass accumulation Clean underside of deck...
  • Page 25 Section 5 TROUBLESHOOTING CUTTING CONDITIONS (CONT'D) CONDITION CAUSE CURE SCALPING - BLADES HITTING Bent spindle mounting area See your authorized SCAG dealer D I R T O R C U T T I N G V E RY CLOSE TO THE GROUND Ground speed too fast Slow speed to adjust for conditions May need to reduce ground speed, raise...

  • Page 26: Section 6 - Adjustments

    Section 6 ADJUSTMENTS 6.1 SELF-PROPEL DRIVE ADJUSTMENTS An adjustment to the self-propel system should be made whenever a new cable is installed. REMOVE COVER SPEED SELECT CONTROL CABLE ADJUSTMENT 1. Shut the engine off and wait for all moving parts to stop.
  • Page 27 - NOTE - If making the adjustment as outlined does not allow for proper speed select operation, contact your local Authorized Scag Power Equipment Dealer. DRIVE CONTROL BAR CABLE ADJUSTMENT 1. Shut the engine off and wait for all moving parts to Figure 6-3.

  • Page 28: Throttle Control And Choke Adjustments

    DRIVE CONTROL BAR 6.2 THROTTLE CONTROL AND CHOKE ADJUSTMENTS These adjustments must be performed by your Authorized Scag Power Equipment Dealer to ensure proper and efficient running of the engine. Should either need adjustment, contact your local authorized Scag service center.

  • Page 29: Cutter Deck Adjustments

    To convert and prepare the mower back to bagging the If additional information or service is needed, contact your grass clippings: Authorized Scag Power Equipment Dealer. 1. Lift the rear cover and remove the rear discharge plug from the cutter deck. See Figure 6-8.

  • Page 30: Section 7 - Maintenance

    Section 7 MAINTENANCE 7.6 MAINTENANCE CHART - RECOMMENDED SERVICE INTERVALS HOURS PROCEDURE COMMENTS BREAK-IN (FIRST 10) Check all hardware for tightness Check the transmission belt See paragraph 7.5 Change engine oil See paragraph 7.2 *Clean mower See paragraph 7.8 Check condition of blade See paragraph 7.6 Check blade stop system See paragraph 4.2...

  • Page 31: Engine Oil

    Section 7 7.7 ENGINE OIL A. CHECKING ENGINE CRANKCASE OIL ENGINE OIL FILL & DIPSTICK LEVEL The engine oil level should be checked after every 8 hours of operation or daily as instructed in the Engine Owner’s Manual furnished with this mower. B.
  • Page 32 Section 7 DO NOT over fill. The empty space in the fuel tank allows 1. Use only an approved gasoline container. the fuel to expand. Overfilling the fuel tank may result in 2. NEVER remove the gas cap or add fuel with the fuel leakage, damage to the engine and/or damage to the engine running.

  • Page 33: Engine Air Cleaner

    Section 7 ENGINE AIR ENGINE AIR FILTER LATCH FILTER LATCH FUEL SHUTOFF VALVE ENGINE FUEL FILTER ENGINE AIR FILTER Figure 7-3. Fuel Filter Figure 7-4. Engine Air Filter 7.9 ENGINE AIR CLEANER 7.10 DRIVE BELT A. CLEANING AND/OR REPLACING AIR The transmission drive belt has a fixed idler and should be CLEANER ELEMENT adjusted after the first 2, 4, 8 and 10 hours of operation.

  • Page 34: Cutter Blade

    The cutter blade should be balanced to 1-1/2 oz-in. blade appear bent, it will need to be replaced. See your Authorized Scag Power Equipment Dealer for blade balancing or special tools, if you choose to 4. Check the cutter blade for wear. If any part of the balance your own blades.

  • Page 35: Wheels

    Section 7 5. To install the new cutter blade, put the flatwashers 1. Remove the rear wheels and clean any debris from onto the blade bolts, and install the bolts into the the wheel area. holes in the cutter blade. 2.

  • Page 36: Section 8 - Illustrated Parts List

    Section 8 ILLUSTRATED PARTS LIST 8.1 SCAG APPROVED ATTACHMENTS AND ACCESSORIES Attachments and accessories manufactured by companies other than Scag Power Equipment are not approved for use on this machine. Scag approved attachments and accessories: Accessories Side Discharge Chute 926AV...
  • Page 37 Section 8 NOTES...

  • Page 38: Cutter Deck

    Section 8 CUTTER DECK...
  • Page 39 Section 8 CUTTER DECK Ref. No. Part No. Description *487347 Engine, GXV-160 *487348 Engine, 5CV *487393 Engine, 7CV 487344 Plug, Mulch 429163 Pin, Pivot 04011-29 Screw, 1/4-20 x 3/8" 44253 Rod, Support Spring 487414 Spring, Rear Cover 463514 Cover, Rear 487302 Trail Shield 487214...

  • Page 40: Sheet Metal Components

    Section 8 SHEET METAL COMPONENTS 12 22...
  • Page 41 Section 8 SHEET METAL COMPONENTS Ref. No. Part No. Description 463514 Cover, Rear 487414 Spring, Rear Cover 429083 Panel, Access 04017-04 Bolt, Hex Head Serrated Flange 1/4-20 x 1/2" 04019-03 Nut, 5/16-18 Serrated Flange 04138-01 Nut, 1/4-20 Cage 463502 Support Bracket, LH 463503 Support Bracket, RH 429193...

  • Page 42: Bag Assembly

    Section 8 BAG ASSEMBLY...
  • Page 43 Section 8 BAG ASSEMBLY Ref. No. Part No. Description 453347 Bag Frame Weldment 487326 Bag, GC...

  • Page 44: Handle Bar Components

    Section 8 HANDLE BAR COMPONENTS...
  • Page 45 Section 8 HANDLE BAR COMPONENTS Ref. No. Part No. Description 453387 Top Bail Weldment 04009-12 Bolt, Shoulder 5/16 x .375 HD 04021-02 Nut, 1/4-20 Center Lock 429122 Clamp, Cable 04117-03 Nut, 1/4-20 Flange Elastic Stop 453388 Bottom Bail Weldment 04003-51 Bolt, Carriage 1/4-20 x 2"...

  • Page 46: Rear Drive System Components

    Section 8 REAR DRIVE SYSTEM COMPONENTS 15 16...
  • Page 47 Section 8 REAR DRIVE SYSTEM COMPONENTS Ref. No. Part No. Description 483453-31 Bearing 487070 Wheel Assembly, Rear 04117-02 Nut, 3/8-16 Flange Elastic Stop 04117-03 Nut, 1/4-20 Flange Elastic Stop 486923 Cover, Wheel Gearing 04050-20 Retaining Ring, 1/2" Ext. HD 486719 Gear, Pinion 486765 Bearing (x2)

  • Page 48: Fuel System (Machines With 7Cv Engine)

    Section 8 FUEL SYSTEM (Machines with 7CV Engine) To Engine...
  • Page 49 Section 8 FUEL SYSTEM (Machines with 7CV Engine) Ref. No. Part No. Description 463366 Fuel Tank Assembly w/Decal (incl. #2, #3, #4, #5) 486939 Valve 486940 Grommet, Valve 482571 Bushing, .56 Viton 483748 Elbow w/ Screen, 90 Degree 486967 Cap, Fuel Tank 48059-01 Clamp, Fuel Hose 1/4"...

  • Page 50: Replacement Decals And Information Plates

    Section 8 REPLACEMENT DECALS AND INFORMATION PLATES DANGER DANGER Avoid injury from burns - Shut off engine - Allow to cool several minutes - Remove cap slowly - Do not overfill Lorem ipsum...
  • Page 51 Section 8 REPLACEMENT DECALS AND INFORMATION PLATES Ref. No. Part No. Description 487489 Decal, Warning - SFC21 484803 Decal, Danger - Cut Finger 485403 Decal, Metalcraft - USA 485667 Decal, Fuel Tank 487402 Decal, SFC-21 487416 Decal, Cut Height - Front 487406 Decal, 21 Commercial Grade 487417...

  • Page 52: Limited Warranty

    Cutter deck is warranted for a period of one (1) year (parts and labor) for commercial use or three (3) years (parts and labor) for non-commercial use The repair or replacement of the cutter deck will be at the option of Scag Power Equipment. We reserve the right to request components for evaluation.
  • Page 53 © 2023 Scag Power Equipment Division of Metalcraft of Mayville, Inc.

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