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Bad Boy MZ MAGNUM Owner's, Service & Parts Manual
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Bad Boy MZ MAGNUM Owner's, Service & Parts Manual

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MZ MAGNUM
ZERO-TURN MOWER
OWNER'S, SERVICE & PARTS MANUAL
For additional information, please see us at
www.badboymowers.com
MODELS
Bad Boy, Inc.
102 Industrial Drive
Batesville, Arkansas 72501
©2015 12-5

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Jerry
June 7, 2025

What is the size of a drive belt for magnum 48

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May 11, 2025

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Summary of Contents for Bad Boy MZ MAGNUM

  • Page 1 MZ MAGNUM MODELS ZERO-TURN MOWER OWNER’S, SERVICE & PARTS MANUAL For additional information, please see us at www.badboymowers.com Bad Boy, Inc. 102 Industrial Drive Batesville, Arkansas 72501 ©2015 12-5...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Basic Information ....................Section 1 (page 4) Bad Boy Safety Guidelines .................. Section 2 (page 5) Operation ......................Section 3 (page 9) Maintenance ...................... Section 4 (page 10) Storage and Transportation ................Section 5 (page 12) Troubleshooting and FAQ .................
  • Page 3 Kohler Engine Kawasaki Engine 063-5002-00 063-5003-00 063-2097-00 (Pre-Cleaner) (Element) Fuel Filter Kohler Engine Kawasaki Engine 063-5001-00 063-6000-00 Spark Plug Kohler Engine Kawasaki Engine 015-8000-00 015-8001-00 Motor Oil 10W-30 Motor Oil – Bad Boy Synthetic Blend Motor Oil Recommended PAGE 3...
  • Page 4 40 CFR 1060 within the first two years Bad Boy Inc. will replace the defective component. Your evaporative emission control system may include parts such as fuel tanks, fuel lines, carbon canisters, fuel caps, valves, vapor hoses, clamps, or connectors.
  • Page 5 SECTION 2: MOWER SAFETY GUIDELINES Never allow untrained people to operate this machine. It is the owner’s responsibility to get training and see to it that anyone who has permission to use your machine receives the proper training. Do not mow around people. The factory discharge chute is designed to deflect debris downward, but it could be possible for debris to be thrown in a way that can cause damage to people or property.
  • Page 6 SLOPE OPERATION Slopes are a major factor related to loss of control and tip over accidents, which can result in severe injury or death. Operation on all slopes requires extra caution. If you cannot back up the slope, or you feel uneasy on it, do not mow it. 2.22 Mow up and down slopes, not across.
  • Page 7 SERVICE: SAFE HANDLING OF GASOLINE To avoid personal injury or property damage, use extreme care in handling gasoline. Gasoline is extremely flammable and the vapors are explosive. 2.45 Extinguish all cigarettes, cigars, pipes, and all other sources of ignition. 2.46 Use only an approved gasoline container. 2.47 Never remove gas cap or add fuel with the engine running.
  • Page 8 SAFETY INTERLOCK SYSTEM Your Bad Boy mower is equipped with a safety interlock system. This system is designed to prevent serious injury or death to the operator and other people or property damage. The system consists of an operator presence switch in the seat, the parking brake, drive lever neutral position, the mower blade engagement switch, and the ignition switch.
  • Page 9 The machine could lose traction on a decline or tip backwards on an incline. 3.14 Once you become comfortable with your Bad Boy Mower you will notice your overall mowing time will decrease.
  • Page 10 SECTION 4: MOWER MAINTENANCE Interval Every 50 Every 100 Maintenance First 8 Every 200 Every 250 Daily hours or hours or Section hours hours hours annually* annually* Check and add engine oil • Section 3 Section 2 Check all belts for proper alignment •...
  • Page 11 Maintenance Log Date: Hours: Performed: Performed: Date: Hours: Performed: Date: Hours: Performed: Date: Hours: Performed: Date: Hours: Performed: Date: Hours: Performed: Date: Hours: Performed: Date: Hours: Performed: Date: Hours: Performed: Date: Hours: Performed: Date: Hours: Performed: Date: Hours: Performed: Date: Hours: Performed: Date:...
  • Page 12 SECTION 5: MOWER STORAGE & TRANSPORTATION Keep machine from collecting debris by storing in a covered area while not in use. 5.2 Fuel can harm your machine if left for more than 30 days without changing, especially if the fuel contains ethanol. Never use fuel with more than 10% ethanol by volume. E-15 is not permitted.
  • Page 13 SECTION 6: TROUBLESHOOTING Q: How do I prevent an uneven cutting pattern and increase the quality of cut? A: Check tire pressure, check blade sharpness (replace blades or sharpen at least once per year or when needed), make sure blades are tightened properly, check spring and belt tension, check the underside of the deck to ensure the mower deck is free of grass build-up and debris, make sure your machine is at full throttle, and vary your mowing pattern each time you cut your grass.
  • Page 14 SECTION 7: CONTROLS Ignition Switch—Bad Boy mowers have a three position ignition switch: off, run, and start. With key inserted, rotate it clockwise to START position and release key when engine starts, and switch will automatically return to he RUN position.
  • Page 15 By pulling the arms out, the mower can be put in a neutral position. Return the arms to the “forward position” for normal operation. Your Bad Boy Mower Weighs: MZ MAGNUM SERIES: 585—620 lbs *** Weights fluctuate with the addition of accessories.

  • Page 16: Greasing Bearings

    SECTION 10: MOWER BLADE MAINTENANCE 10.1 Check mower blades after each use. This is essential for maintaining well-groomed turf. Keep the blades sharp. If a dull blade is used for cutting, the grass will tear rather than cut. This could damage the grass leaving a brown frayed top on the grass within a few hours. A dull blade will also require more power from the engine.

  • Page 17: How To Choose The Right Blade

    HOW TO CHOOSE THE RIGHT BLADE Essentially there are only TWO basic styles of mowing blades used or approved for use on our current products: 1) The standard style of mowing blade is essentially designed for cutting grass and effectively discharging the clippings out from the deck to fall onto the lawn or to be captured in a grass collection system.

  • Page 18: Mowing Tips

    MOWING TIPS: • Mow header strips at the ends of the lawn and around flower beds first. Make them wide enough that you can turn the mower around in the already mown section. Then mow back and forth between these header strips overlapping each lap by about 1/8 the width of the mower’s deck.

  • Page 19: Service Section

    SERVICE SECTION SECTION 1: HYDROSTATIC SYSTEM The hydrostatic system on MZ models is a sealed lifetime transaxle system, so no maintenance is required. Under the rear of the mower, you will find the two levers shown in the image. These bypass levers serve as a neutral for moving the mower while the engine is not running.
  • Page 20 SECTION 2: DRIVE BELT Shown to the right is the MZ pump belt tensioner. Tightening the two 3/4" j am nuts on the right side w ill increase the belt tension. The tension should be adjusted so that there is between 50 to 55 lbs.
  • Page 21 Bad Boy recommends that the oil and filter be changed at intervals of 50 usage hours or yearly, whichever occurs first. The oil capacity is 2 quarts. Bad Boy 10W-30 synthetic blend engine oil is recommended for maximum protection.
  • Page 22 6) Fill crankcase with approximately 2 quarts of new oil. Level should top of indicator on dipstick. 7) Reinstall oil fill/dipstick and tighten securely. 8) Start engine; check for oil leaks. Stop Engine; correct oil leaks. Recheck oil level. 9) Dispose of used oil and filter in accordance with local ordinances.
  • Page 23 3.2 Changing your fuel filter 1) Locate your fuel filter and mark the direction it is facing. 2) Clamp each side of the fuel filter to minimize and gas spills. 3) Remove the clips from each side of the fuel filter and remove the fuel filter.
  • Page 24 3.3 Changing the air cleaner 1) Unlock the air cleaner cover and remove to access the air cleaner. 2) Remove the paper element and precleaner. 3) Replace or wash precleaner in warm water with detergent. Rinse and allow to air dry. 4) Lightly oil precleaner with new engine oil;...
  • Page 25 This machine has an oil drain hose installed on the engine to allow for easier oil changes. Bad Boy recommends that the oil and filter be changed at intervals of 50 usage hours or yearly, whichever occurs first. The oil capacity is 2 quarts.
  • Page 26 The fuel filter is located in the fuel line on the left side of the engine by the starter motor. Replace the filter yearly. Prior to the removal of the old filter, note the direction of fuel flow as indicated on the filter. Have towels readily available in order to quickly remove any fuel leakage.
  • Page 27 The air cleaner is the engine’s only defense against damaging foreign particles. It is very important that the air cleaner element is inspected prior to each use. Remove the element and tap its sides in order to remove debris. Do not blow the filter out using compressed air.
  • Page 28 3.4 Changing the spark plugs and checking the spark plug gap: 1) Remove the wire on the spark plug and use a 13/16” socket to remove the spark plug. 2) Check the gap on the spark plug to verify that it is 0.03 in using a feeler gauge.
  • Page 29 Make sure that wire terminal ends have not the mower’s electrical components. If a fuse is electrical components. If repeatedly blowing, contact your Bad Boy dealer. been pushed out of the relay block. a fuse is repeatedly blowing, contact your Bad Boy dealer.
  • Page 30 On most models, the red wire coming out of the engine is the charging wire from the alternator. Check for 13.6 - 14.2 volts dc at this wire with engine at full throttle. Check the condition and connection of the relays located under the control panel.
  • Page 31 PAGE 31...
  • Page 32 SECTION 5: FRAME Torque rear wheel lugs to 65-75 ft. lbs. Re-torque at every oil change and check at every mowing. There is one grease fitting on each of the actuator bar pillow blocks (Total of 4). Grease twice a season. The pump belt tensioner is located under the engine and has a grease fitting at its pivot point.
  • Page 33 SECTION 6: CUTTING DECK Deck belt removal: (1) Remove ignition key. (2) Lower the deck to its lowest position. (3) Remove both the right and left blade pulley cover. Use a 7/16” socket or wrench to remove the bolts. Then lift and remove the pulley covers. (4) Remove the belt on the left side blade pulley as facing the mower.
  • Page 34 (4) Ensure the belt is on every pulley and then place the belt on the bolt of the pulley on the left side and place pressure on it and roll the pulley to allow the belt to fall into place. (5) Check to make sure the belt is on all the pulleys and matches the belt routing sticker.
  • Page 35 Leveling the Deck: (1) Start on a flat surface. Rotate front casters forward. (3) Set the air pressure in all four tires to 12 psi. (4) Raise the deck up, and measure all four corners of the deck to see if it is level from left to right and front to back.
  • Page 36 Bad Boy recommends that blade sharpening be preformed by a professional. or left blade pulley cover. (5) While lifting up on the belt (as shown in the photograph), rotate the pulley until the belt is free of the pulley.
  • Page 37 Blade Removal: To change blades, it may be easier to use a piece of wood to keep the blade from turning so that the bolt can be loosened. Use a 15/16” socket and impact Drill, or a wrench and an extension to gain more leverage.

  • Page 38: Parts Section

    PARTS SECTION Front Tire Assembly Front Tire Assembly ITEM PART NUMBER DESCRIPTION 023-1000-00 Front Fork MZ 025-0008-00 Front Wheel Spanner 018-0004-00 1/2" x 7" Hex Bolt Grade 5 013-9004-00 1" Fine Thread 1/2" Nylock Nut 018-0005-00 1-14 x 5 Hex Bolt Grade 8 Zinc Yellow 010-2000-00 Caster Bearing 2009 &...
  • Page 39 Steering Arm Assembly Items Per Side Welded to Frame PAGE 39...
  • Page 40 Parts List ITEM PART NUMBER DESCRIPTION 069-4010-00 Rubber Grip 031-8821-00 Left Direction Steering Arm 031-8822-00 Right Direction Steering Arm 039-1125-00 MZ Switch Bracket 019-8027-00 .515 ID Nylon Shoulder Washer 034-8025-00 Drive Lever Spring 013-8043-00 5/16" Nut 018-4010-00 1/2" - 13 Nylon Insert Jam Locknut 019-8051-00 5/16"...
  • Page 41 MZ Magnum Shroud Assembly PAGE 41...
  • Page 42 MZ Magnum Shroud Assembly ITEM PART NUMBER DESCRIPTION 070-5900-00 2014 54" MZ Magnum Frame 039-1200-00 MZ Magnum Gas Tank Bracket Assy 201-2040-00 MZ Magnum Shroud Control Support Assy 201-2030-00 MZ Magnum Shroud Storage Support Assy 079-0075-00 Control Panel New MZ...
  • Page 43 Parts List ITEM PART NUMBER DESCRIPTION 026-2010-00 MZ Seat Plate 071-9001-00 Black Seat 034-8045-00 Seat Spring 014-8047-00 Spring Cap Cover 071-8062-00 Seat Saftey Switch 018-8065-00 5/16-18 x 1 Carriage Bolts Zinc 019-6042-00 .360 ID Plastic Washer 013-8049-00 5/16" Nylock Flange Nut 018-5040-00 3/8"...
  • Page 44 DETAIL B DETAIL A DETAIL C PAGE 44...
  • Page 45 54" MZ Frame 018-6012-00 3/8" x 1 1/2" Hex Bolt 026-2020-00 MZ Height Indicator Plate 031-1050-50 MZ Magnum Deck Level Lock Lever 013-5041-00 3/8 Nylock Nut 025-5203-00 Spacer 3/4 OD x 1/2 ID x 3\4 Length 4 (3 for Magnum) 019-2073-00 .390 ID Plastic Washer...
  • Page 46 Magnum Deck Lift Assembly Parts List ITEM PART NUMBER DESCRIPTION 070-5900-00 2014 54" MZ Magnum Frame 031-1010-00 MZ Front Arm 013-5202-00 3/8" Nylock Flange Nut 019-2073-00 .390 ID Plastic Washer 025-0010-00 Deck Spacer MZ 013-5201-00 3/8" Flange Nut 018-6012-00 3/8" x 1 1/2" Hex Bolt...
  • Page 47 Axle Assembly DETAIL A PAGE 47...
  • Page 48 Parts List ITEM PART NUMBER DESCRIPTION 039-1124-00 MZ Brake Lock Bracket 013-8073-00 1/4" Nylock Nut 019-7040-00 1/4" Flat Washer 034-3050-00 Brake Spring 018-8052-00 1/4" x 3/4" Hex Bolt 077-8073-00 Safety Switch 018-1076-00 1/4-20 x2-1/2 Gr2 hex C/s zinc 013-5019-00 10-24 Nylon Insert Locknut 018-5200-00 10-24 X 5/8 BS Button Head Bolt 201-2020-00...
  • Page 49 Kawasaki FR-651V Parts List ITEM PART NUMBER DESCRIPTION 033-2010-00 3-3/4" Motor Pulley 042-6030-00 1/4" x 1" Key 103-5400-00 Black Boot For Ground Cable 019-8051-00 5/16" Lock Washer 018-1075-00 3/8 x 1 1/8 bolt 015-5404-00 oil drain 064-8061_00 Ground Cable 018-5321-00 M8x1.20x20MM Hex head bolt 015-2709-00 Exhaust Gasket...
  • Page 50 Kohler KT-725 & KT-740 Parts List ITEM PART NUMBER DESCRIPTION 015-2014-00 Kohler KT-740 015-2015-00 Kohler KT-725 041-6400-00 Pump Belt 033-2010-00 3-3/4" Motor Pulley 042-6030-00 1/4" x 1" Key 018-1075-00 3/8 x 1 1/8 bolt 015-0060-00 2014 MZ Muffler-725cc Kohler 064-8061_00 Ground Cable 103-5400-00 Black Boot For Ground Cable...
  • Page 51 42" MZ & 48" 54" MZ Magnum- Chute Assembly ITEM PART NUMBER DESCRIPTION 206-6020-00 Chute Hanger 039-4891-00 Discharge Chute Bracket MZ (Upper) 210-6015-00 Rubber Discharge Chute MZ (Component) 013-8049-00 5/16" Nylon Flange Nut 018-8062-00 5/16-18x3/4 carriage bolt 019-6042-00 .360 ID Plastic Washer...
  • Page 52 MZ 48" Deck Assembly DETAIL A Page 52...
  • Page 53 Parts List ITEM PART NUMBER DESCRIPTION 060-2100-00 48 MZ Deck (Component) 013-5202-00 3/8" Nylock Flange Nut 019-5029-00 3/8" Flat Washer 034-2009-00 2009 Deck/Pump Idler Spring 013-8050-00 1/2-13 Nylon Flange Nut 025-5203-00 Spacer 3/4 OD x 1/2 ID x 3\4 Length 041-6027-00 B128 Deck Belt 013-0054-00...
  • Page 54 MZ Magnum 54" Deck Assembly DETAIL A PAGE 54...
  • Page 55 MZ Magnum 54" Deck Assembly ITEM PART NUMBER DESCRIPTION 060-2400-00 54 MZ Deck 206-6020-00 Chute Hanger 48 MZ 019-6042-00 .360 ID Plastic Washer 013-8049-00 5/16" Nylon Flange Nut 018-6036-00 1/2" x 2 3/4" Hex Bolt 033-5000-00 5 3/4" Deck Idler Pulley 025-5203-00 3/4"...
  • Page 56 037-2000-00 Spindle Assembly Parts List ITEM PART NUMBER DESCRIPTION 037-6027-00 Spindle Housing 037-6028-00 Spindle Spacer-Component 037-6025-00 Spindle Shaft 037-6024-00 Spindle Bearing PAGE 56...
  • Page 57 PAGE 57...

  • Page 58: Limited Warranty

    1. WHAT THIS WARRANTY COVERS, AND FOR HOW LONG: Bad Boy, Inc. will, at its option, repair or replace, without charge, any part covered by the warranty which is found to be defective in material and/or workmanship for two (2) years or (200) hours* after the date of sale to the original retail purchaser unless the product is used for commercial, industrial, or rental purposes, in which case the Bad Boy MZ mower will carry no warranty, whatsoever.
  • Page 59 Bad Boy, Inc. 102 Industrial Drive Batesville, AR 72501 www.badboymowers.com Technical Support: ............techsupport@badboymowers.com Warranty: ..................warranty@badboymowers.com Parts: ....................partsdept@badboymowers.com WARRANTY REGISTRATION Ensure selling dealership has registered mower within 30 days of purchase to validate warranty. Please record your serial number, date of purchase and dealership information for your records.
  • Page 60 MAGNUM MODEL For additional information, please see us at www.badboymowers.com Bad Boy, Inc. 102 Industrial Drive Batesville, Arkansas 72501...
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