57” ROUGH CUT MR55K MR55B OWNER’S MANUAL With Assembly Instructions For Models: MR55B-19HP, MR55B-23HP & MR55K KUNZ ENGINEERING, INC.
SAFETY INTRODUCTION Your safety, and the safety of others, is very important. To help you make informed decisions about safety, we have provided operating procedures and other information on labels and in this manual. This information alerts you to potential hazards that could hurt you or others. You will find important safety information in a variety of forms, including: Safety Labels – on the mower. Safety Messages – preceded by a safety alert symbol words: DANGER, WARNING, or CAUTION.
IMPORTANT SAFETY INFORMATION WARNING: Do not allow anyone to operate this equipment who has not fully read and comprehended the safety manual and who has not been properly trained in the safe operation of the equipment. WARNING: Operator should be familiar with all functions of the unit. DANGER: Keep hands, feet, hair and clothing away from moving parts. WARNING: Remove all objects from the work area that might be picked up and thrown by the blades. WARNING: Do not mow when children and others are around.
SAFETY SIGNS AND LOCATIONS 275003 – Danger Decal, Cut Hand & Foot 275007 – Warning Decal, Belt Sheild 275002 – Warning Decal, General Serial # and Model # Decal Clean or Replace Any Safety Signs That Are not Readable or Damaged Replacement decals can be purchased from your local dealer or Kunz Engineering Inc.
ASSEMBLY INSTRUCTIONS Read the complete assembly instructions before starting the assembly. You should have: - one mower deck assembly - two carrier arm assemblies - two rear tire assemblies - one ATV tongue assembly A. ASSEMBLY OF MOWER WHEELS 1. Set the mower deck assembly on wood blocks so that it is suspended off the ground. Note: The operator controls are on the front of the deck.
Carrier Arm Assembly Hex Nut and Lock Washer Rear Tire Cup Washer Bolt Flat Washer Figure 1: Rear Tire Assembly Installation Hitch Pivot – Attach to Either Left or Right Carrier Arm Assy. Tongue Height Adjust Screw Front (Rubber Flap Side) Rear Tire Assy. (Attach on outside for both left and right sides) Carrier Arm Assy. Offset Position Pivot Arm Direct Behind Position Figure 2: Assembly of Carrier Arm Assy.
Direction of Travel Screw Pin Shackle Clevis Shift Tongue Left or Right Between Holes Tongue 5/16” Wire Lock Pins Wire Lock Section of Wire Lock Pin (Placed Back From Direction of Travel) Figure 3: ATV Tongue Assembly OPERATIONS AND ADJUSTMENTS This safety alert symbol is used to indicate safety instructions. Follow these instructions to avoid personal injury and/or property damage. Read and follow all instructions in this manual and the attached engine manual.
The tongue is equipped with a screw pin shackle clevis to provide movement in all directions on rough uneven ground. To prevent loss of the screw pin due to vibration or debris, place the screw pin through the tow vehicle hitch and clevis and turn the screw pin until snug. The tongue is designed to adjust from left to right within the hitch pivot. This allows the mowers position to be varied behind the tow vehicle.
The cutting height can be adjusted in a range from 2.0" to 8.0". This is accomplished by turning the height adjust cranks on both sides of the mower. See Figure 5. Turn the cranks clockwise to raise the mower cutting height and counter-clockwise to lower the mower cutting height. DANGER: Shut off tow vehicle engine and allow mower blades to stop completely before attempting to measure the cutting height. Adjust the mower as follows: 1. Pull the mower on to a smooth, level surface. 2.
C. STARTING ENGINE WARNING: Set parking brake on tow vehicle. Attach mower tongue to tow vehicle. WARNING: Do not start rough cut mower unless it is attached to the tow vehicle. Turn on fuel shut off valve which is located on the underside of the gas tank. Set the choke to the desired position. Set the throttle at approximately half throttle. Start engine and allow engine to warm up. Set engine speed at about half throttle and engage mower blades clutch handle.
WARNING: Remove all objects from the work area that might be picked up and thrown by the blades. WARNING: Do not mow when children and others are around. WARNING: Do not fill fuel tank while engine is running or hot. WARNING: Keep all safety shields and deflectors in place during operation. CAUTION: Remove grass build up from under safety shields before each use. Do not remove safety shields while engine is running. Dry grass build up around belts and sheaves can cause fires.
F. DRIVE BELT REMOVAL AND TENSION – Refer to Figure 7 WARNING: Shut off engine and allow mower blades to stop turning before making any adjustments or repairs. Remove the safety shields. Loosen the nuts on the spring-loaded idler; adjust bolt until the belt can be slipped off the idler and drive sheaves. Slip the belt down under the drive sheave and off the blade spindle sheaves. Install the new belt and then adjust the tension as follows: See Figure 7.
of the brake stud and slide the brake stud in the slot. When the proper disengaged spring length is achieved, tighten the bolt on the top of the brake stud. For this procedure do not adjust the spring length. The spring length should only be changed when adjusting the belt tension. Brake Stud Clearance: This inspection is necessary to prevent over-braking. With the clutch engaged, check to make sure that there is at least 1/2” of clearance between the brake stud and the belt.
G. MOWER BLADE REMOVAL, BALANCING & INSTALLATION CAUTION: Sharp blades can cause bodily injury if not handled properly. When removing the blade, it is recommended that a block of wood be placed between the blade and the underside of the mower deck. This will allow the removal of the blade without the need to hold the blade by hand. CAUTION: Always balance the mower blades each time they are sharpened.
ACREASE ROUGH CUT MOWER SPECIFICATIONS Model Model Model MR55B-19HP MR55B-23HP MR55K Engine Make Briggs & Stratton Briggs & Stratton Kohler Engine Model ENGINE: Intek Professional OHV Intek Professional OHV Command OHV Cylinders 1 2 2 Cycles 4 4 4 Crankshaft Vertical Vertical Vertical Engine HP 19 23 20 3.12" 3.12" 3.03" Bore Stroke 3.06" 2.89" 2.64" Displacement 33.0 cubic inches 44.2 cubic inches 38.1 cubic inches Oil Capacity 1.5 U.S. qt 2 U.S. qt 2 U.S.
ACREASE ROUGH CUT MOWER PARTS LIST Item 1 2 3 4 5 6 7 8 8 9 9 10 11 12 13 14 15 16 17 18 19 20 21 22 22 22 23 23 23 24 24 24 24 24 24 24 24 25 26 27 28 29 Part # 202141 214021 216002 216009 222005 222012 225005 226003 226008 226004 226009 238004 241001 241009 241010 243007 243010 258022 900075 900160 243006 600271 241008 259002 260004 264000 264003 264010 269000 269007 269010 269001 269008 269009 275001 275002 275003 275011 275007 275019 275021 275022 277002 277011 277035 277036 277040 Description Blade
Item 30 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 48 49 50 51 52 Part # 600071 600173 600126 600133 600136 600142 600143 600146 600189 600290 600294 900023 900049 900058 900061 900062 900065 243005 900066 900069 900071 600172 900079 900082 900106 900148 Description Spacer, 1.38" O.D. x 1.33" Wall x 2.19" Long (MR55B-19.5HP & MR55B-23HP) Spacer, 1.38" O.D. x 1.33" Wall x 2.
9 36 42 4 17 46 34 3 52 44 8 50 6 15 47 51 35 14 31 2 43 45 39 26 11 7 41 33 24 22 21 12 10 37 16 23 18 1 20 32 17 13 30 5 28 48 40 19 29 25 27 38 49 ACREASE ROUGH CUT MOWER PARTS
OPTIONAL EQUIPMENT OPTIONAL WETLANDS KIT The optional wetlands kit features an extra set of tires for added ground support in soft or water saturated areas. The following are applications and features that the wetlands kit works best in. • • • • • • • Great for wetlands or marshy areas that stay wet all year around. Works well in combination with small personal amphibious vehicles or tracked ATVs. More than doubles the tire surface area in contact with the ground. Very easy to install bolt-on kit.
OPTIONAL EQUIPMENT OPTIONAL ELECTRIC LIFT KIT The optional electric lift kit consists of all of the mounting hardware, brackets, electric actuator and wiring with remote control panel. • • • • • Great for constantly changing terrain and grass/brush heights. Allows for quick cutting height changes on the go from the seat of the tow vehicle. Raise up and over rocks and logs with ease. Heavy duty 1500 lb linear screw actuator made by Linak. Works on all existing and new rough cut mowers.
OPTIONAL EQUIPMENT OPTIONAL FLOATATION KIT The optional floatation kit consists of one additional front and rear tire, mounting brackets and hardware. • • • • Great for mowing around ponds and on rough uneven ground where scalping would normally occur. Clamping style receiver allows for adjustments from side to side with both the front and rear tires. Pinned receivers make for quick kit removal when not needed. Works on all existing and new rough cut mowers.
