Baroness LM551 Service Manual
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Baroness LM551 Service Manual

5-unit reel mower
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5-Unit Reel Mower
Service Manual
Serial No.
LM551：10001-
　
　
Ver.1.0

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Summary of Contents for Baroness LM551

  • Page 1 5-Unit Reel Mower Service Manual Serial No. LM551：10001- 　 　 Ver.1.0...
  • Page 2 LM551 Introduction This manual describes about the procedures of maintenance and malfunction diagnosis etc. of this product. Items of description are categorized per system for representative maintenance contents. We hope you will use the product safely, and take advantage of its best performance.
  • Page 3 When replacing parts, be sure to use genuine Baroness parts or parts designated by Kyoeisha. Note that the Baroness product warranty may not apply to defects caused by the use of parts from other companies. For maintenance work on this product, refer to the following manuals.
  • Page 4 LM551 Introduction...

  • Page 5: Table Of Contents

    LM551 Contents Safety .............. Page 1-1 Safe Operating Practices .......Page 1-2 Safety Signs and Instruction Signs ....Page 1-5 Disposal ............Page 2-1 Recycle and Waste Disposal ......Page 2-2 Maintenance Standards and Maintenance .. Page 3-1 Unit Conversion ..........Page 3-2 Maintenance Standards .........Page 3-4...
  • Page 6 LM551 Contents...

  • Page 7: Safety

    LM551 Safety Safe Operating Practices ...... Page 1-2 Training ..........Page 1-2 Preparation ..........Page 1-2 Operation ..........Page 1-3 Maintenance and Storage ..... Page 1-4 Safety Signs and Instruction Signs ..Page 1-5 About Safety Signs and Instruction Signs ............Page 1-5...

  • Page 8: Safe Operating Practices

    LM551 Safety Failure to adequately follow these safety Never allow children or people unfamiliar precautions may cause an accident resulting in with these instructions to use or service the injury or death. machine. Local regulations may restrict the age of the...

  • Page 9: Operation

    LM551 Safety Add fuel before starting the engine. Never Never operate across the face of the remove the cap of the fuel tank or add fuel slope, unless the machine is designed for while the engine is running or when the this purpose.

  • Page 10: Maintenance And Storage

    LM551 Safety Never operate while people, especially To reduce the fire hazard, keep the engine, children, or pets are nearby. silencer/muffler, battery compartment fuel storage area, cutting unit and drives free of Slow down and use caution when making grass, leaves, or excessive grease. Clean up turns and crossing roads and sidewalks.

  • Page 11: Safety Signs And Instruction Signs

    If they are damaged, become dirty, or peel off, replace them with new ones. Part numbers for decals that need to be replaced are listed in the parts catalog. Order them from a Baroness dealer or Kyoeisha. Safety Signs and Instruction Signs Page 1-5...

  • Page 12: Safety Signs And Instruction Signs

    LM551 Safety Page 1-6 Safety Signs and Instruction Signs...

  • Page 13: Disposal

    LM551 Disposal Recycle and Waste Disposal ....Page 2-2 About Recycle ........Page 2-2 About Waste Disposal ......Page 2-2 Page 2-1...

  • Page 14: Recycle And Waste Disposal

    LM551 Disposal Recycle and Waste Disposal About Recycle Recycling battery etc. is recommended for environmental conservation and economical use of resources. It may be required by local laws. About Waste Disposal Make sure that waste generated when servicing or repairing the machine is disposed of in accordance with local regulations.

  • Page 15: Maintenance Standards And Maintenance

    LM551 Maintenance Standards and Maintenance Unit Conversion ........Page 3-2 Inch-Millimeter Conversion Table ..Page 3-2 US Unit-SI Unit Conversion Table ..Page 3-3 Maintenance Standards ......Page 3-4 Adjusted Value ........Page 3-4 Tightening Torques ....... Page 3-5 Standard Tightening Torques ....Page 3-5 Principal Tightening Torques ....

  • Page 16: Unit Conversion

    LM551 Maintenance Standards and Maintenance Unit Conversion Inch-Millimeter Conversion Table 1 mm = 0.03937 in 1 in = 25.4 mm Fractions Decimals Fractions Decimals 　 1/64 0.015625 0.397 33/64 0.515625 13.097 　 　 　 　 　 1/32 0.03125 0.794 17/32 0.53125...

  • Page 17: Us Unit-Si Unit Conversion Table

    LM551 Maintenance Standards and Maintenance US Unit-SI Unit Conversion Table To Convert Into Multiply By Miles Kilometers 1.609 Yards Meters 0.9144 Feet Meters 0.3048 Linear Measurement Feet Centimeters 30.48 Inches Meters 0.0254 Inches Centimeters 2.54 Inches Millimeters 25.4 mile Square Miles Square Kilometers 2.59...

  • Page 18: Maintenance Standards

    LM551 Maintenance Standards and Maintenance Maintenance Standards Adjusted Value Item Adjusted Value Details Mower stabilizer spring #1-5 140.0 mm (5.51 in) Spring total length LS62/66, #1, 4, 5 15.0 mm (0.59 in) Length from end of bolt to nut LH62 #2, 3 40.0 mm (1.57 in)

  • Page 19: Tightening Torques

    LM551 Maintenance Standards and Maintenance Tightening Torques Important Refer to the Tightening Torque table. Note that the Baroness product warranty may not apply to defects caused by incorrect or overtorque tightening, etc. Standard Tightening Torques Bolts and Nuts Important A number of bolts are used in each part of this machine.
  • Page 20 LM551 Maintenance Standards and Maintenance General bolt Strength classification 4.8 Nominal diameter tib3yb-001 kgf-cm lb-in 3 - 5 30.59 - 50.99 26.55 - 44.26 7 - 9 71.38 - 91.77 61.96 - 79.66 14 - 19 142.76 - 193.74 123.91 - 168.17 29 - 38 295.71 - 387.49...
  • Page 21 LM551 Maintenance Standards and Maintenance Hydraulic Hose The tightening torques for union joints and union adaptors with parallel pipe threads (G, PF) are shown in the table below. A union joint or adaptor will not become loose or leak as long as it is tightened by the specified torque.

  • Page 22: Principal Tightening Torques

    LM551 Maintenance Standards and Maintenance Principal Tightening Torques Tightening Torque by Model LM551 LM551A Tighten the following bolts and nuts at the torque specified in the table. For thread locking adhesive, apply a middle strength thread locker (ThreeBond 1322 or equivalent anaerobic sealant).

  • Page 23: General Precautions

    LM551 Maintenance Standards and Maintenance General Precautions Housing Bearing Bearing Bearing driver The bearing is a precision machine part. When pressing the bearing into the shaft and Handle the bearing in an appropriate work housing evenly, apply pressure evenly with...

  • Page 24: Stop Ring

    LM551 Maintenance Standards and Maintenance Stop Ring Shaft Stop ring (sharp edge side) Caution Stop ring groove When installing the stop ring to a hole or a When installing the stop ring for a hole, shaft, the stop ring may become disengaged...

  • Page 25: Spring Pin

    LM551 Maintenance Standards and Maintenance When installing spring pins, install them such Spring Pin that the slot in the spring pin is facing the direction in which load is applied from. Important As shown in the illustration, check the installation orientation of the spring pin if a When installing the spring pin, do not load is applied in the direction of the arrow.

  • Page 26: Special Tool

    LM551 Maintenance Standards and Maintenance Special Tool List of Special Tools Pressure gauge for high pressure measurements Pressure gauge for hydraulic pressure measurements K4701000010 Pressure range: 0 - 35 MPa (0 - 5,076.40 psi) (0 - 356.90 kgf/cm vasdfi-004 Pressure gauge for low pressure measurements...
  • Page 27 LM551 Maintenance Standards and Maintenance Pressure gauge seal Installed between the hydraulic K4701000050 pressure gauge and the pressure gauge joint. vasdfi-005 Pressure gauge joint Coupling for connecting the hydraulic pressure gauge and hydraulic hose. K4701000040 Thread size: PF3/8 x PT1/4...
  • Page 28 LM551 Maintenance Standards and Maintenance O-ring connector PF1/4PF1/4 Connector for installing the pressure gauge to the hydraulic valve pressure K3008000232-Y measuring port. Thread size: PF1/4 x PF1/4 q9c6v6-005 UNF90 adjustable elbow 1128-06-04 Connector for installing the pressure gauge to the hydraulic valve pressure K3008000932-Y measuring port.
  • Page 29 LM551 Maintenance Standards and Maintenance Branched joint 1/4 Coupling used for installing the hydraulic pressure gauge in the flow K3090000312-Y path for hydraulic pressure measurements. q9c6v6-057 F wheel mount fixing kit Used to remove or install the wheel LM551--8011Z0 mount of the front wheel.
  • Page 30 LM551 Maintenance Standards and Maintenance 6005 Bearing driver Used when driving in bearings with K4802000502 outer φ47 and inner φ25. q9c6v6-009 Page 3-16 Special Tool...

  • Page 31: Usage

    LM551 Maintenance Standards and Maintenance Usage Oil Seal Installer Bearing Driver Use an oil seal installer to install the oil seal etc. correctly. Use bearing drivers to drive in bearings etc. Caution accurately. Be careful not to hit your hand with a hammer Caution etc.

  • Page 32: Jacking Up The Machine

    LM551 Maintenance Standards and Maintenance Jacking Up The Machine 　 Jack-up points Front right frame About Jacking Up The Machine Front left frame Right pivot Warning Left pivot When replacing a tire or beginning any other Front right frame maintenance or repairs, be sure to chock the wheels to prevent the machine from moving.

  • Page 33: Greasing

    LM551 Maintenance Standards and Maintenance Greasing About Greasing Since there may be adhesion or damage due to lack of grease on moving parts, they must be greased. Add urea-based No. 2 grease in accordance with the Maintenance Schedule. Other locations where the specified grease or lubricant is used are indicated in "Greasing...

  • Page 34: Greasing Points

    LM551 Maintenance Standards and Maintenance Mower unit #3 No. of Location greasing 　 points Mower arm fulcrum Lift arm fulcrum Lift arm fulcrum shaft Swiveling bracket fulcrum Brake pedal shaft fulcrum Traveling pedal shaft fulcrum Operating speed stopper 8bq62b-361 Pivot...
  • Page 35 LM551 Maintenance Standards and Maintenance Lift arm fulcrum Mower unit #4 There is one greasing point on each lift arm fulcrum connected to the mower unit. Mower unit #1 8bq62b-367 Greasing Points_010 Mower unit #5 8bq62b-364 Greasing Points_007 Mower unit #2...
  • Page 36 LM551 Maintenance Standards and Maintenance Mower unit #5 Brake pedal shaft fulcrum 8bq62b-370 8bq62b-373 Greasing Points_013 Greasing Points_016 Swiveling bracket fulcrum Traveling pedal shaft fulcrum There is one greasing point on each swiveling bracket fulcrum connected to the mower unit.
  • Page 37 LM551 Maintenance Standards and Maintenance Rear wheel Left 8bq62b-377 Greasing Points_020 Rear wheel Right 8bq62b-378 Greasing Points_021 Joint 8bq62b-379 Greasing Points_022 Greasing Page 3-23...
  • Page 38 LM551 Maintenance Standards and Maintenance Page 3-24 Greasing...

  • Page 39: Hydraulic System

    LM551 Hydraulic System General Inspection and Repair .....Page 4-2 Note ............Page 4-2 Towing ........... Page 4-2 Neutral ........... Page 4-2 Depressurization ........Page 4-2 Hydraulic Traveling Circuit Failure ..Page 4-3 Replacement of Hydraulic Oil ....Page 4-3 Air Bleeding ........... Page 4-4 Hydraulic Hose ........

  • Page 40: General Inspection And Repair

    LM551 Hydraulic System After repair, check to see whether the General Inspection and Repair hydraulic system functions normally and whether there are any broken parts. Note When the hydraulic system has been Before Inspection and Repair repaired or replaced, operate the machine slowly, idling the engine, to allow the air to Move the machine to level surface.

  • Page 41: Hydraulic Traveling Circuit Failure

    LM551 Hydraulic System Fit the hydraulic hoses, piping, and hydraulic Hydraulic Traveling Circuit Failure fittings that have been removed. The hydraulic traveling circuit of this equipment Important is made up of a closed circuit. Use only the specified hydraulic oil.

  • Page 42: Air Bleeding

    LM551 Hydraulic System After the hydraulic circuit is filled with Air Bleeding hydraulic oil, operate the up/down cylinder several times. Important Stop the engine immediately when the cylinder does not move within 10 to 15 When you replace or repair the motor, pump, seconds or if there is any noise from the cylinder, etc., make sure that the hydraulic...

  • Page 43: Hydraulic Hose

    LM551 Hydraulic System Remove burrs on the inside and outside of Hydraulic Hose the tube with a file or the like, and clean. Hydraulic hoses may become severely worn if they are subjected to weathering, sun or chemicals, if they are stored in extremely hot warehouses, or if they are handled roughly during operations or maintenance.
  • Page 44 LM551 Hydraulic System Fix the temporary tightening tool onto the Sleeve A vise and apply hydraulic oil to the threads, Sleeve B tapered part, and sleeve. w7s31b-005 w7s31b-007 Bite Type Tube Fitting_005 Bite Type Tube Fitting_008 Put the tube end onto the hole bottom of...
  • Page 45 LM551 Hydraulic System Note: Adjustable Elbow ￭ For direct tightening, use the fitting body to follow procedures 1 to 5 when using a temporary tightening tool, and set the zero point. Further tighten for 1 and 1/4 turn from the zero point.
  • Page 46 LM551 Hydraulic System Make sure that the thread portion, sheet After fitting the opposite screw, tighten the surface of the O-ring port, and O-ring are lock nut while holding the elbow with a not contaminated with foreign objects. spanner etc. to ensure that the setting Apply oil or grease to the sheet surface position does not change.
  • Page 47 LM551 Hydraulic System Before connecting the joint, wind sealing Wrap it in clockwise direction (direction to ･ tape on the taper thread portion. tighten the screw). "How to Use The Sealing Tape" (Page Wrapping in the opposite direction may 4-9) cause the tape to be easily peeled off.

  • Page 48: Hydraulic Circuit Configuration

    LM551 Hydraulic System Hydraulic Circuit Configuration Hydraulic System Layout dwb7jb-016 Hydraulic System Layout_001 Gear motor Gear pump Breather Up/down cylinder Piston pump Orbitrol Stack valve Cross-valve Mower up/down solenoid valve Front wheel motor, right Oil cooler Reel rotation solenoid valve...
  • Page 49 LM551 Hydraulic System Gear motor Gear pump The gear rotates with the force of hydraulic The gear rotates with the engine rotation, to pressure supplied from the hydraulic discharge hydraulic oil to the hydraulic pressure pump, to convert rotation motion to circuit.
  • Page 50 LM551 Hydraulic System Line filter Electromagnetic check valve Filters contaminants present in the hydraulic Solenoid valve for delaying the timing for oil, and prevents them from entering the raising or lowering the #2, #3 mower units. hydraulic circuit. Moving the up/down lever to up activates the It is located under the seat on the left.

  • Page 51: Hydraulic Circuit Diagram

    LM551 Hydraulic System Hydraulic Circuit Diagram 6inb7c-025E Hydraulic Circuit Diagram_001 See Hydraulic Circuit Specifications for hydraulic equipment symbols. Hydraulic Circuit Configuration Page 4-13...

  • Page 52: Hydraulic Circuit Specifications

    LM551 Hydraulic System Hydraulic Circuit Specifications With LH52 mower unit installed Hydraulic Equipment Displacement Pressure Flow Rate Symbol* Name L/min G/min /rev /rev kgf/cm Piston pump 35.0 2.14 106.3 28.1 Gear pump 11.36 0.69 34.5 Gear pump 11.36 0.69 34.5 Gear pump 4.13...
  • Page 53 LM551 Hydraulic System With LH62/LS62/LS66 mower unit installed Hydraulic Equipment Displacement Pressure Flow Rate Symbol* Name /rev /rev kgf/cm L/min G/min Piston pump 35.0 2.14 106.3 28.1 Gear pump 11.36 0.69 34.5 Gear pump 11.36 0.69 34.5 Gear pump 4.13 0.25...

  • Page 54: Flow Of Hydraulic Oil

    LM551 Hydraulic System Flow of Hydraulic Oil Flow of Hydraulic Oil during Forward Traveling lxdezw-001 Flow of Hydraulic Oil during Forward Traveling_001 shows the flow of hydraulic oil. shows the port name. Line filter Front wheel motor, left Piston pump...

  • Page 55: Flow Of Hydraulic Oil During Steering Turning To Left

    LM551 Hydraulic System Flow of Hydraulic Oil during Steering Turning to Left xzbw4z-001 Flow of Hydraulic Oil during Steering Turning to Left_001 shows the flow of hydraulic oil within the hydraulic circuit. shows the port name. Orbitrol Steering cylinder Hydraulic tank...

  • Page 56: Flow Of Hydraulic Oil During Raising Mower Unit

    LM551 Hydraulic System Flow of Hydraulic Oil During Raising Mower Unit krbqmh-001 Flow of Hydraulic Oil During Raising Mower Unit_001 shows the flow of hydraulic oil within the hydraulic circuit. shows the port name. Mower up/down solenoid valve Suction filter...

  • Page 57: Flow Of Hydraulic Oil When Cutting With Mower Unit

    LM551 Hydraulic System Flow of Hydraulic Oil When Cutting with Mower Unit BKLP2 BKLP1 z1bvrg-001 Flow of Hydraulic Oil When Cutting with Mower Unit_001 shows the flow of hydraulic oil within the hydraulic circuit. shows the port name. #1 gear motor...

  • Page 58: Hydraulic Circuit Flow

    LM551 Hydraulic System Hydraulic Circuit Flow Traveling Circuit Forward Traveling (4WD) ms5j2m-017E Forward Traveling (4WD)_001 Page 4-20 Hydraulic Circuit Flow...
  • Page 59 LM551 Hydraulic System Reverse Traveling (2WD) pizs5v-013E Reverse Traveling (2WD)_001 Hydraulic Circuit Flow Page 4-21...

  • Page 60: Raise/Lower Circuit

    LM551 Hydraulic System Raise/Lower Circuit Up/Down Cylinder Raising qhyyzc-018E Up/Down Cylinder Raising_001 Page 4-22 Hydraulic Circuit Flow...
  • Page 61 LM551 Hydraulic System Up/Down Cylinder Lowering (Operation) jtjf9j-015E Up/Down Cylinder Lowering (Operation)_001 Hydraulic Circuit Flow Page 4-23...

  • Page 62: Steering Circuit

    LM551 Hydraulic System Steering Circuit Steering Cylinder Counter-Clockwise Turning zujak2-010E Steering Cylinder Counter-Clockwise Turning_001 Page 4-24 Hydraulic Circuit Flow...
  • Page 63 LM551 Hydraulic System Steering Cylinder Clockwise Turning c3cs72-009E Steering Cylinder Clockwise Turning_001 Hydraulic Circuit Flow Page 4-25...

  • Page 64: Reel Rotation Circuit

    LM551 Hydraulic System Reel Rotation Circuit Reel Positive Rotation (Operation) k46fs2-011E Reel Positive Rotation (Operation)_001 Page 4-26 Hydraulic Circuit Flow...
  • Page 65 LM551 Hydraulic System Reel Reverse Rotation (Back Lapping) 2naiq2-002E Reel Reverse Rotation (Back Lapping)_001 Hydraulic Circuit Flow Page 4-27...

  • Page 66: Measurement

    LM551 Hydraulic System Warm up the hydraulic oil before starting Measurement pressure measurement. Note Warning The most effective way of solving problems in Be sure to depressurize the hydraulic system the hydraulic system is to use a measuring before inspecting or repairing it.

  • Page 67: Hydraulic Pressure Measurement Preparation

    LM551 Hydraulic System Hydraulic Pressure Measurement Preparation Prepare the measuring instruments before starting the hydraulic pressure measurement. Caution Select the appropriate pressure gauge to suit the set pressure of the hydraulic circuit being measured. Assemble the following parts as shown in the illustration.

  • Page 68: Traveling Circuit

    LM551 Hydraulic System Traveling Circuit Forward Traveling (4WD) ms5j2m-018E Forward Traveling (4WD)_001 Hydraulic pressure gauge Page 4-30 Measurement...
  • Page 69 LM551 Hydraulic System Install the pressure gauge for high pressure Important measurements onto the O-ring connector Use a pressure gauge and hydraulic hose PF1/4-PF1/4. Secure the pressure gauge to the main which can withstand the pressure of 23.0 MPa vehicle with string so that it does not fall.
  • Page 70 LM551 Hydraulic System Use the slings to secure the main vehicle to a pillar so that it does not move forward. Always attach the slings to a pillar of sufficient strength. At this time, be careful that hydraulic hoses or electrical wires are not crushed by the slings.
  • Page 71 LM551 Hydraulic System Reverse Traveling (2WD) pizs5v-014E Reverse Traveling (2WD)_001 Hydraulic pressure gauge Measurement Page 4-33...
  • Page 72 LM551 Hydraulic System Install a pressure gauge for high pressure Important measurements on the UNF90 adjustable elbow 1128-06-04. Use a pressure gauge and hydraulic hose Secure the pressure gauge to the main which can withstand the pressure of 23.0 MPa vehicle with string so that it does not fall.
  • Page 73 LM551 Hydraulic System Use the slings to secure the main vehicle to a pillar so that it does not reverse. Always attach the slings to a pillar of sufficient strength. At this time, be careful that hydraulic hoses or electrical wires are not crushed by the slings.
  • Page 74 LM551 Hydraulic System Charge Circuit zg85f8-047E Charge Circuit_001 Hydraulic pressure gauge Page 4-36 Measurement...
  • Page 75 LM551 Hydraulic System Install branched joint 1/2 so that it is Important inserted between the line filter and Use a pressure gauge and hydraulic hose hydraulic hose. At this time, install it so that the tip of which can withstand the pressure of 1.4 MPa adapter 1013-6 attached to the branched (14.3 kgf/cm...
  • Page 76 LM551 Hydraulic System Lower the seat and sit on the driver's seat. Start the engine, and allow the hydraulic oil temperature to increase to the same temperature as during ordinary use. Check that there is no hydraulic oil leaking from the location where the pressure gauge was installed.

  • Page 77: Up/Down Circuit (Rise)

    LM551 Hydraulic System Up/Down Circuit (Rise) z4kw7w-053E Up/Down Circuit (Rise)_001 Hydraulic pressure gauge Measurement Page 4-39...
  • Page 78 LM551 Hydraulic System Install the pressure gauge for high pressure Important measurements to adapter 1013-6. Hold the pressure gauge with your hands. Use a pressure gauge and hydraulic hose which can withstand the pressure of 13.7 MPa (139.7 kgf/cm ) (1987.0 psi) or more.

  • Page 79: Steering Circuit (Turning To Left)

    LM551 Hydraulic System Steering Circuit (Turning to Left) g2hgdk-011E Steering Circuit (Turning to Left)_001 Hydraulic pressure gauge Measurement Page 4-41...
  • Page 80 LM551 Hydraulic System Install the pressure gauge for low pressure Important measurements to adapter 1013-6. Hold the pressure gauge with your hands. Use a pressure gauge and hydraulic hose which can withstand the pressure of 8.8 MPa (89.7 kgf/cm ) (1276.3 psi) or more.

  • Page 81: Reel Rotation Circuit

    LM551 Hydraulic System Reel Rotation Circuit Mower Units #1/#4/#5 8lilaz-006E Mower Units #1/#4/#5_001 Hydraulic pressure gauge Measurement Page 4-43...
  • Page 82 LM551 Hydraulic System Install the pressure gauge for high pressure Important measurements to adapter 1013-6. Secure the pressure gauge to the main Use a pressure gauge and hydraulic hose vehicle with string so that it does not fall. which can withstand the pressure of 17.2 MPa (175.4 kgf/cm...
  • Page 83 LM551 Hydraulic System Set the reel rotation/stop changeover levers of the gear motors of all mower units (#2, #3, #4, and #5) except mower unit #1 to the "Stop" position. zzpqiy-003 Mower Units #1/#4/#5_006 Reel rotation/stop switching lever Rotation Stop...
  • Page 84 LM551 Hydraulic System Mower Units #2/#3 x9s1w3-013E Mower Units #2/#3_001 Hydraulic pressure gauge Page 4-46 Measurement...
  • Page 85 LM551 Hydraulic System Follow the same procedure for measuring the pressure of the #1, #4, #5 mower units to measure the pressure of the #2, #3 mower unit reel cutter rotation circuits. ･ The location for installing the pressure gauge is the #2 mower unit.
  • Page 86 LM551 Hydraulic System Page 4-48 Measurement...

  • Page 87: Electrical System

    LM551 Electrical System General Inspection and Repair .....Page 5-2 Battery ........... Page 5-2 Electrical System Outline ......Page 5-8 Electrical Part Layout ......Page 5-8 Electric Wiring Diagram ....... Page 5-11 Interlock System ........Page 5-12 Electrical Circuit Configuration ..Page 5-13 Engine Start Circuit ......Page 5-13 Engine Start/Stop Circuit .....

  • Page 88: General Inspection And Repair

    LM551 Electrical System The electrolyte contained in the battery is General Inspection and Repair sulfuric acid. Contact of the electrolyte (sulfuric acid) with Battery the skin could cause blindness or burns. Handling of the Battery Contact of the electrolyte with the machine etc.
  • Page 89 LM551 Electrical System Danger Danger Do not throw, drop, tilt or tip over the battery, or subject it to physical impact. Doing so could cause the electrolyte to leak. If contact of the electrolyte with the eye, skin, or clothing occurs, immediately wash it off with plenty of water.
  • Page 90 LM551 Electrical System Danger Danger Caution If the battery has an unusual odor, if the If deformation of the exterior of the battery is electrolyte level goes down unusually fast, or observed, do not continue to use it. if the electrolyte leaks, do not continue to use Doing so could result in damage to the battery the battery.

  • Page 91: Battery

    LM551 Electrical System Cleaning the exterior Use a wet cloth for cleaning. Inspect the vent plugs or vent holes on the side of the battery, and if they are blocked U P P E R L E V E L...
  • Page 92 LM551 Electrical System (-) cable (black) (+) cable (red) Installing a New Battery S20 = St + 0.0007(t - 20) Install the new battery with the correct polarities and firmly secure the battery with the mounting bracket. Remove the protection caps attached to the terminals of the new battery.
  • Page 93 LM551 Electrical System Battery Charge Caution The temperature of the electrolyte must be When charging the battery with the battery 45°C or lower during charging. In the case of charger, follow the correct steps according to fast charging, it must be 55°C or lower.

  • Page 94: Electrical System Outline

    LM551 Electrical System Electrical System Outline Electrical Part Layout SOL4 SOL3 SOL1 SOL2 K10 K11 K1 K3 K4 K2 K7 K6 K5 SNS9 SOL8 SNS2 erq4ky-018 Electrical Part Layout_001 Page 5-8 Electrical System Outline...
  • Page 95 LM551 Electrical System SNS8 SNS7 SNS6 SNS5 SNS3 SOL6 SOL7 SOL5 SNS4 SNS1 erq4ky-019 Electrical Part Layout_002 Electrical System Outline Page 5-9...
  • Page 96 LM551 Electrical System Key switch SNS2 Proximity switch /#2 mower Tank unit Traveling/Working changeover SNS3 Proximity switch /#4 mower Level switch switch Reel rotation switch SNS4 Proximity switch /#5 mower Fuel pump Reel forward/reverse switch SNS5 Proximity switch/Parking brake Pilot lamp...

  • Page 97: Electric Wiring Diagram

    LM551 Electrical System Electric Wiring Diagram <59> Lg <E> B <4> Lg <55> GW Water temperature switch <51> BW Oil pressure switch <5> G <2> RW <3> RW <7> W <73> R <100> RW <E> B <99> RB <51> BW <54>...

  • Page 98: Interlock System

    LM551 Electrical System Interlock System The interlock system is a safety system to prevent injury or accident caused by operator inattentiveness using combined control with multiple switches and sensors. The system operates in coordination with the seat switch, proximity switches and control...

  • Page 99: Electrical Circuit Configuration

    LM551 Electrical System Reel Cutter Rotation/Mower Unit Up/Down Conditions ￭ The reel cutter rotation and mower unit up/down will not operate unless the following conditions are present. Note: The mower unit up/down and reel cutter rotation will not operate unless the engine is operating.
  • Page 100 LM551 Electrical System Engine start circuit diagram SNS5 SNS9 sldqbs-001 Engine Start Circuit_001 Key switch Fuse box Off Delay Timer Reel rotation switch Fusible link 50 A Relay 1/Seat switch Seat switch Battery Relay 3/Reel rotation Proximity switch/Parking brake Starter...

  • Page 101: Engine Start/Stop Circuit

    LM551 Electrical System Engine Start/Stop Circuit There are five switches related to engine operation, each of which operates a relay in coordination with each switch. These are configured so that the following switches control multiple circuits. Reel rotation switch Reel forward/reverse switch...
  • Page 102 LM551 Electrical System Engine start/stop circuit diagram SNS5 SNS9 ojv6cd-001 Engine Start/Stop Circuit_001 Key switch Fusible link 50 A Off Delay Timer Reel rotation switch Fusible link 30 A Relay 1/Seat switch Reel forward/reverse switch Battery Relay 2/Stop solenoid Seat switch...

  • Page 103: Mower Unit Up/Down Circuit

    LM551 Electrical System Mower Unit Up/Down Circuit The up/down of the mower unit is controlled by the following electrical components. Traveling/Working selector switch Proximity switch /#4 mower Proximity switch /#5 mower Proximity switch/Up/down lever (up) Proximity switch/Up/down lever (down) On delay timer...
  • Page 104 LM551 Electrical System Mower unit up/down circuit diagram SOL8 SNS8 SNS3 SNS4 SNS7 SOL6 SOL7 SOL5 pz6f78-003 Mower Unit Up/Down Circuit_001 Traveling/Working changeover switch Proximity switch /#4 mower All mower up/down solenoid Relay 10/#4 down detection Proximity switch /#5 mower...

  • Page 105: Reel Rotation Circuit

    LM551 Electrical System Reel Rotation Circuit The rotation of the reel cutter is controlled by the following electrical components. Reel rotation switch Reel forward/reverse switch Traveling/Working changeover switch Proximity switch /#1 mower Proximity switch /#2 mower Proximity switch /#4 mower...
  • Page 106 LM551 Electrical System Reel rotation circuit diagram SNS2 SNS3 SNS4 SNS1 SOL1 SOL2 SOL3 SOL4 dmxdti-028 Reel Rotation Circuit_001 Traveling/Working changeover switch Proximity switch /#1 mower Front mower rotation solenoid Reel rotation switch Proximity switch /#2 mower Rear mower rotation solenoid...

  • Page 107: Alarm Buzzer Circuit

    LM551 Electrical System Alarm Buzzer Circuit There are two alarm buzzers, which notify four alarms. Identifying whether the alarm is sounding continuously or intermittently helps to understand the type of fault that is present. 3zsw3j-001 Alarm Buzzer Circuit_001 Buzzer EBS-12 (intermittent)
  • Page 108 LM551 Electrical System Buzzer EBS-12 Circuit The buzzer EBS-12 activates and makes an intermittent sound under the following conditions, so check the usage conditions and water temperature. Overheating alarm, engine overload alarm (intermittent) ･ The buzzer sounds if the water temperature within the engine exceeds 110 degrees Celsius.
  • Page 109 LM551 Electrical System Buzzer EBM-12 Circuit The buzzer EBM-12 activates and makes a continuous sound under the following conditions, so check the usage conditions and level of hydraulic oil. ･ Hydraulic oil level warning, brake dragging alarm (continuous) The buzzer sounds when the hydraulic oil is approximately 3.0 dm (3.0 L) lower than the...

  • Page 110: About The Electrical Components

    LM551 Electrical System About The Electrical Components Timer unit Thermo-start Lamp Important Fuel gauge, water temperature gauge, charge lamp, oil pressure (engine oil pressure) lamp, When servicing electrical components, be buzzer EBS-12, buzzer EBM-12, hour meter sure to disconnect the negative battery cable.

  • Page 111: Fusible Link

    LM551 Electrical System Fusible Link Replacement of Fusible Link Fusible link 30 A The fuse can be removed by pulling it up ･ The fusible link functions as the fuse for the away from the holder. engine fuel cut solenoid.

  • Page 112: Key Switch

    LM551 Electrical System Key Switch START ￭ Use the key switch to start, operate, or stop the The engine starts by rotating the starter engine. motor, when the magnet switch of the starter Switching the electrical circuits in 4 stages motor is energized with the key at "START"...

  • Page 113: Seat Switch

    LM551 Electrical System emrg9g-001 Inspection of Key Switch_001 STOP GLOW 6m8tje-006 START Inspection of Seat Switch_001 Seat switch GLOW Terminal A START Terminal B emrg9g-002 Rocker Switch Inspection of Key Switch_002 Seat Switch The rocker switch is located in the operation...

  • Page 114: Proximity Switch

    LM551 Electrical System Reel forward/reverse switch Proximity switch Switch for changing the direction of rotation Plastic magnet of the reel cutter. Proximity switch detection part Moving this switch to the "Reverse" side changes the direction of rotation of the reel Important cutter to "Reverse rotation"...
  • Page 115 LM551 Electrical System Proximity switch/Up/down lever (up) Type Color Name Application Mounted to the lower side of the fulcrum of Proximit Proximity For rear mower the up/down lever, and detects the y Switch Grey switch /#2 reel cutter rotation operation position of the up/down lever.
  • Page 116 LM551 Electrical System Move the plastic magnet close to and Proximity Switch V-out away from the proximity switch, and check that the continuity is in the following Inspection of Output Voltage ￭ condition. NO type ･ Important When the plastic magnet detected:...
  • Page 117 LM551 Electrical System Adjustment of Proximity Switch /#1 Mower ￭ The proximity switch /#1 mower detects the position of the #1 mower unit lift arm. This signal operates in coordination with proximity switches /#4 & #5 mower to control the rotation start position of the #1, #4 and #5 reel cutters.
  • Page 118 LM551 Electrical System Start the engine and raise/lower the Loosen the bolt securing the up/down mower unit, until the distance (A) from the sensor mounting plate. ground to the grease nipple of the #1 Check that the terminal relay LED ⑤...
  • Page 119 LM551 Electrical System Terminal relay LED ⑤ Slowly move the proximity switch closer to the plastic magnet and secure the up/ down sensor mounting plate when LED ⑤ turns off. After adjustment, check the illumination condition of LED ⑤. Note: qqmvi3-001 The confirmation conditions for LED ⑤...
  • Page 120 LM551 Electrical System Set the traveling/working selector switch to "Working" and the reel rotation switch to "Rotation." #4mower up-down #5mower up-down All mowers up-down #1 #4 #5mower rotation #2 #3mower rotation #1 #4 #5mower reverse #2 #3mower reverse qqmvi3-003 Adjustment of Proximity Switch /#2 Mower_003...
  • Page 121 LM551 Electrical System Start the engine, and raise and lower the Adjustment of Proximity Switches /#4 ￭ mower unit so that the #4 mower unit Mower, /#5 Mower makes contact with the #4, 5 unit guide roller in a position with angle A.
  • Page 122 LM551 Electrical System Check that the terminal relay LED ① Slowly move the proximity switch closer turns off when moving the proximity to the plastic magnet and secure the up/ switch further away from the proximity down sensor mounting plate when LED sensor magnet.
  • Page 123 LM551 Electrical System Secure the parking brake at the second notch. as9qxl-004 Adjustment of Proximity Switch/Parking Brake_004 as9qxl-002 P brake sensor plate Adjustment of Proximity Switch/Parking Brake_002 Proximity switch/Parking brake Brake pedal Bolt Locking claw Plastic magnet Secure at the second notch...
  • Page 124 LM551 Electrical System Adjust the plastic magnet attached to the Operate the mower unit up/down lever and traveling pedal so that its bottom surface lower the mower unit #1. is parallel with the attachment as shown in the figure. lwkjk9-003...
  • Page 125 LM551 Electrical System While pushing on the traveling pedal, Pedal stopper move the proximity switch to a position Work speed lock lever close to the plastic magnet until the buzzer Traveling pedal sounds. Slowly move the proximity switch away from the plastic magnet, and secure the P...

  • Page 126: Relays

    LM551 Electrical System Move the up/down lever to the up side and down side, and check that the plastic magnet moves equally to the two proximity switches to complete the adjustment. 52bra2-008 Relays_002 Relay 1/Seat switch Relays Relay 2/Stop solenoid...
  • Page 127 LM551 Electrical System Relay 4/Starter Inspection of Relay (MR5A411A1K) Operates with other relays when specific conditions are met, to ensure safety. Remove the relay. Connected to the starter, and controls the The normal measured resistance between electrical circuit to the starter depending on relay terminals 1 and 2 is about 75 Ω.
  • Page 128 LM551 Electrical System Inspection of Relay (MR5A602A1K) Inspection of Relay (CA1aF-12V-N-5) Remove the relay. Remove the power relay. The normal measured resistance between The normal measured resistance between relay terminals 1 and 2 is about 75 Ω. relay terminals 1 and 2 is about 80 Ω.
  • Page 129 LM551 Electrical System Normal operation is when there is no Normal operation is when there is conduction between terminals 3 and 4. conduction between relay terminals 3 and 4 with the battery connected to relay terminals 1 and 2. 38jyg3-015...

  • Page 130: Terminal Relay

    LM551 Electrical System Terminal Relay Inspection of Relay (CA1-DC12V-N) Remove the relay. The terminal relay controls the following. The normal measured resistance between Reel cutter rotation direction relay terminals 1 and 2 is about 80 Ω. Up/down of all mower units...
  • Page 131 LM551 Electrical System Terminal Relay Operating Conditions Illuminated Operating Conditions Remarks 　 Controls the up position of the #4 mower ･ #4 mower unit up position detection unit, down start position of the rear mower Relay 1 Traveling/Working selector switch ①...
  • Page 132 LM551 Electrical System Inspection of Terminal Relay Measure the continuity of the terminal relay to #4mower up-down determine if it is good or faulty. #5mower up-down Remove all terminal relay wires. All mowers up-down Use a circuit tester and check that the continuity is in the following condition, using the table below as a guide.

  • Page 133: Solenoid Valve

    LM551 Electrical System Important This relay has a specific polarity. When connecting the battery, always connect positive (+) to terminal 8. Check that the continuity is in the following condition when applying battery voltage between relay terminals 1 and 8.
  • Page 134 LM551 Electrical System Reel Rotation Solenoid Valve Operation ￭ All mower up/down solenoid #4 mower up/down solenoid Front mower rotation solenoid #5 mower up/down solenoid The hydraulic circuit is switched with the signal from the terminal relay and relay 8/...
  • Page 135 LM551 Electrical System Electromagnetic Check Valve Operation ￭ #2, #3 mower up/down solenoid ･ The hydraulic circuit is switched with the electric signal from relay 11/#2, 3 up/down SOL related to the on delay timer, to control the up/down of the rear mower unit.

  • Page 136: Delay Timer

    LM551 Electrical System Solenoid Specifications ￭ Holding Valve Solenoid Resistance current Front mower rotation solenoid Rear mower rotation solenoid Front mower reverse rotation Reel Rotation Solenoid Valve 7.0 Ω 1.7 A solenoid Rear mower reverse rotation solenoid All mower up/down solenoid...
  • Page 137 LM551 Electrical System On Delay Timer (#2, #3 mower unit up/down switch timer) The on delay timer is located under the right side of the seat, and is connected to output an up/down signal to the rear mower unit after the up/down signal to the front mower unit.

  • Page 138: Alarm Buzzer

    LM551 Electrical System Circuit diagram Buzzer EBS-12 (continuous) Buzzer EBM-12 (intermittent) Inspection of Alarm Buzzer Important This alarm buzzer has a specific polarity. When connecting it to the battery, make sure to connect the positive (+) and negative (-) +12V terminals correctly.

  • Page 139: Level Switch

    LM551 Electrical System Level Switch Inspection of Level Switch The level switch is located on the top of the hydraulic tank and switches "ON" and "OFF" according to the rise and fall of the float. (The arrow indicates the float travel distance.) The relay can be determined to be good or faulty by measuring its continuity.

  • Page 140: Fuel Pump

    LM551 Electrical System Fuel Pump Charge Thermo-start The fuel pump is located under the seat on the Engine oil pressure side of the right frame, and powered by DC12V and its inside is composed of a solenoid, Charge diaphragm, check valve, etc.

  • Page 141: Fuel Gauge

    LM551 Electrical System Engine Oil Pressure The lamp turns on when the ignition key is set to the "ON" position before the engine starts. It turns off when the engine starts and engine oil pressure is generated properly. It is connected to an oil pressure switch...

  • Page 142: Hour Meter

    LM551 Electrical System Hour Meter LED work lamp ROPS The hour meter is located under the hood and indicates total operating time of the engine. The work lamps light up and off by operating Every six minutes of engine operation will the toggle switch (light switch).
  • Page 143 LM551 Electrical System Light switch LED work lamp Fuse (15 A) Inspection of LED Work Lamp (NS-2556) Important This work lamp has a specific polarity. When connecting it to the battery, make sure to connect the positive (+) and negative (-) terminals correctly.
  • Page 144 LM551 Electrical System Page 5-58 About The Electrical Components...

  • Page 145: Main Vehicle

    LM551 Main Vehicle Adjustment ..........Page 6-2 Adjustment of Brake ......Page 6-2 Adjustment of Parking Brake ....Page 6-3 Adjusting The Neutral Position of The Piston Pump ........Page 6-3 Adjustment of the Push-Pull Cable ..Page 6-4 Adjustment of Traveling Pedal ....Page 6-5 Adjustment of Pedal Stopper ....

  • Page 146: Adjustment

    LM551 Main Vehicle Adjust the travel of the brake pedal by Adjustment tightening the brake wire adjustment bolt. Adjustment of Brake If the brake pedal play is too large, the ･ braking power will be decreased and the pedaling will be light.

  • Page 147: Adjustment Of Parking Brake

    LM551 Main Vehicle Adjust the adjustment bolt so that the latch Adjustment of Parking Brake is positioned in the fourth or fifth notch from the top. Caution Make sure that the brake wire is not cracked or damaged. Important Make sure that the brake is effective on slopes and that it is not applied any longer when you release it.

  • Page 148: Adjustment Of The Push-Pull Cable

    LM551 Main Vehicle The lock nut uses a 1/2 inch wrench, and the Tighten the lock nut. traction adjusting cam uses a 1/4 inch wrench. Follow the steps below to adjust the neutral position. Loosen the lock nuts. Slowly rotate the traction adjusting cam until all tires stop.

  • Page 149: Adjustment Of Traveling Pedal

    LM551 Main Vehicle Forward travel pedal Reverse travel pedal Stopper bolt for forward travel Stopper bolt for reverse travel 20.0 mm (0.79 in) Press the forward travel pedal and check that the stopper bolt for forward travel is in contact with the stepped plate. Then, turn it...

  • Page 150: Adjustment Of Pedal Stopper

    LM551 Main Vehicle When the engine is at maximum speed, Turn the pedal stopper in the right foot area check that the forward travel speed is 16.0 to the "ON" position. km/h (9.94 mph) and rear travel speed is 8.0 km/h (4.97 mph).

  • Page 151: Adjustment Of Throttle Wire

    LM551 Main Vehicle Tighten the nut. Adjustment of Throttle Wire The movement of the lever may become sluggish, the play of the inner wire may change due to the R angle of the outer wire, and the inner wire may be stretched due to deterioration of parts.
  • Page 152 LM551 Main Vehicle Adjust the adjustment bolt (engine side) so Tighten the nut. that the engine low speed stopper bolt makes contact with the rotation adjustment lever. 6v3fj3-031 Adjustment of Throttle Wire_004 Throttle lever 6v3fj3-029 Stopper Adjustment of Throttle Wire_002...

  • Page 153: Adjustment Of Toe Angle

    LM551 Main Vehicle Adjustment of Toe Angle Adjustment of Pivot Stopper Misaligned toe angle may result in strange Warning handling feel, or cause vibrations. Inspect them and, if necessary, implement Before starting the engine, verify that no one adjustment. other than workers are around the mower unit and that the area is free of obstacles.

  • Page 154: Adjustment Of Control Arm

    LM551 Main Vehicle Adjustment of Control Arm Kingpin stopper The control arm can be adjusted up or down Stopper bolt and forward or backward. 1.0 mm (0.039 in) Adjust the position to fit the operator. Loosen the nut. Use the same procedure to adjust the...

  • Page 155: Adjustment Of Belt Tension

    LM551 Main Vehicle Adjustment of Belt Tension Adjustment of Stoppers Warning Important Be sure to stop the engine before adjusting The installation method and installation the belts. position of the stoppers differ depending on the mower unit model. Important The stopper is installed to prevent the mower...

  • Page 156: Adjustment Of Mower Stabilizer

    LM551 Main Vehicle Adjustment of Stopper Nuts Stopper Note: Spring washer Depending on the specifications, this function may not be available. Adjustment of Mower Stabilizer The stopper nut adjusts the movement range Note: of the mower unit. Depending on the specifications, this function Apply the parking brake, and then stop the may not be available.

  • Page 157: Adjustment Of Mower Unit Leveling Spring

    LM551 Main Vehicle Mower unit #3 Adjustment of Mower Unit Leveling Spring A coil spring is installed on the mower unit coupling. This keeps the mower unit level. Adjust the coil spring with the holes in the lift arm. Mower unit #1...

  • Page 158: Adjustment Of Mower Stopper

    LM551 Main Vehicle Adjustment of Mower Stopper Coil spring Lift arm Adjustment of Mower Stoppers for Mower Unit #1 Light spring load (standard position) The mower stopper is installed to prevent the Heavy spring load mower unit from interfering with the frame.
  • Page 159 LM551 Main Vehicle LH52・LS62・LS66 Remove the nuts of the mower stopper. oxie9a-008 oxie9a-002 Adjustment of Mower Stoppers for Mower Unit #1_002 Adjustment of Mower Stoppers for Mower Unit #2 and #3_001 Mower stopper Bolt Spring washer Spring washer Washer Washer Adjust the mower stopper position.
  • Page 160 LM551 Main Vehicle Mower unit #3 LH52・LS62 oxie9a-014 oxie9a-010 Adjustment of Mower Stoppers for Mower Unit #2 and Adjustment of Mower Stoppers for Mower Unit #2 and #3_003 #3_005 Mower stopper front position Mower stopper Mower stopper rear position Front Rear Attach the mower stoppers temporarily.
  • Page 161 LM551 Main Vehicle LS66 LH52・LS62 Mower unit #3 After installing the mower stoppers, press the stopper auxiliary fitting COMP firmly against the bottom side of the frame and secure it with the bolts. oxie9a-016 Adjustment of Mower Stoppers for Mower Unit #4 and...

  • Page 162: Removal And Installation Of Each Section

    LM551 Main Vehicle Remove the bolt, spring washer, and Removal and Installation of Each washer used to install the reel motor. Section Mower Unit Mower Unit Layout Mower Unit Layout 4 3 2 z4x8uv-001 Removal of LS62/LS66_001 Reel motor Bolt...
  • Page 163 LM551 Main Vehicle Lift up the mower connecting fitting and Reel motor remove it from the mower arm. Bolt Spring washer Washer Remove the reel motor and seal. z4x8uv-004 Removal of LS62/LS66_004 Mower connecting fitting Mower arm hbntv1-002 ￭ Removal of LH62...
  • Page 164 LM551 Main Vehicle Mower connecting fitting Reel motor Mower arm Remove the retaining snap pin, and then the flat-head pin and collar with hole. Removal of LH52 ￭ Caution The reel cutter (cutting cylinder), bed knife (bottom blade), and groomer blades are all edged tools.

  • Page 165: Axle

    LM551 Main Vehicle Rotate the threaded section of the tie rod Installation of Mower Unit end puller to the tightening side, and remove it from the kingpin. Caution The reel cutter (cutting cylinder), bed knife (bottom blade), and groomer blades are all edged tools.
  • Page 166 LM551 Main Vehicle Kingpin Wheel mount R wheel mount fixing kit Removal of Kingpin ￭ Bolt Caution Loosen the slotted nut with a socket wrench. Exercise care in handling the kingpin since it Note: is heavy. Socket wrench size: 37 mm Follow the steps below to remove the left kingpin.
  • Page 167 LM551 Main Vehicle Follow the steps below to remove the Wheel mount steering cylinder. Pulley remover Remove the U nut and disc spring Slotted nut washer. Remove the slotted nut and washer, and then remove the wheel mount. k8h973-007 Removal of Kingpin_007...
  • Page 168 LM551 Main Vehicle Follow the steps below to remove the Remove the collar and lid. kingpin. Important Note the position of the slot when removing the spring pin. Important Support the bottom of the kingpin with a jack to stop it falling down.
  • Page 169 LM551 Main Vehicle Apply grease to the O-ring and thrust Installation of Kingpin ￭ bearing. Reference: Caution "Replacement of The Kingpin Bearing" (Page 6-40) Exercise care in handling the kingpin since it is heavy. Important Be sure to replace the thrust bearing or O-ring with new ones, if they are damaged or are worn.
  • Page 170 LM551 Main Vehicle Align the hole of the collar with the hole Important of the shaft of the kingpin. When installing the kingpin on the pivot, support the bottom of the kingpin with a jack to stop it falling down.
  • Page 171 LM551 Main Vehicle Spring pin Steering cylinder Hammer Cylinder mounting shaft Jack U nut Disc spring washer Remove the jack. Install the tie rod. Follow the steps below to install the steering cylinder. Reference: "Installation of Tie Rod" (Page 6-21)
  • Page 172 LM551 Main Vehicle Use a wire to check that the key is in the Wheel mount key groove of the wheel motor shaft. R wheel mount fixing kit Bolt Important Wheel motor shaft slotted nut tightening torque 280 - 300 N-m (2,855.16 - 3,059.10 kgf-cm)
  • Page 173 LM551 Main Vehicle Remove the R wheel mount fixing kit. Remove the tie rod. Reference: Install a cotter pin to the wheel motor "Removal of Tie Rod" (Page 6-21) shaft hole, and bend it firmly. Remove the left and right kingpin.
  • Page 174 LM551 Main Vehicle Remove the nut, spring washer, washer, Remove the pivot shaft. and plain washer. gt9gk8-004 gt9gk8-002 Removal of Pivot_004 Removal of Pivot_002 Pivot shaft Slowly lower the jacks positioned on the Spring washer left and right of the pivot to a position...
  • Page 175 LM551 Main Vehicle Slide the pivot to the side and remove it Place the jacks in the positions shown in from mower frame. the illustration. gt9gk8-006 m8a59i-002 Removal of Pivot_006 Installation of Pivot_002 Pivot Jack Frame Slide the pivot in from the side of the frame.
  • Page 176 LM551 Main Vehicle Slowly raise the jacks until the holes in the Install the washers, spring washer, and pivot and frame are aligned. nut. m8a59i-003 gt9gk8-002 Installation of Pivot_004 Installation of Pivot_006 Pivot Frame Spring washer Washer Insert a washer between the frame and Washer pivot, and insert the pivot shaft.

  • Page 177: Brake

    LM551 Main Vehicle Loosen the slotted nut with a socket Brake wrench. Note: Removal of Brake Caliper Socket wrench size: 37 mm Jack up the machine and remove the front Remove the F wheel mount fixing kit. tires. Reference: "Jack-Up Points" (Page 3-18) Remove the cotter pin of slotted nut securing the wheel mount.
  • Page 178 LM551 Main Vehicle Place the wheel mount (disc rotor part) with Caution the calipers attached. As shown in the illustration, prepare two If you remove the wheel mount with the double-folded corrugated cardboards of an slotted nut removed, the wheel mount and appropriate size.
  • Page 179 LM551 Main Vehicle Place the caliper with the side where the Housing disc rotor is to be inserted oriented upward. Pad (cam) Remove the corrugated cardboard with Pad support (cam) holding the pads (cam) (carrier) by hand to Pad (carrier) prevent the pad (cam) from coming out.
  • Page 180 LM551 Main Vehicle Insert the pivot pin into the pivot pin Cam lever receiver of the housing. Pivot pin hole Pivot pin Pad support (cam) Spring retainer Installation of Brake Caliper Follow the steps below to install the brake caliper.
  • Page 181 LM551 Main Vehicle Install the pad support and pad of the Follow the steps below to install the wheel carrier through the groove of the housing. mount. Check the position of the key of the wheel motor. Align the key groove of the wheel mount with the key of the wheel motor.
  • Page 182 LM551 Main Vehicle Use a wire to check that the key is in the key groove of the wheel motor shaft. ikhpjf-009 Installation of Brake Caliper_010 ikhpjf-007 Torque wrench Installation of Brake Caliper_008 Follow the steps below to install the brake Wire wire.

  • Page 183: Inspection And Repair Of Each Section

    LM551 Main Vehicle Install the bottom brake wire as well Inspection and Repair of Each Section using the same procedure. Brake Inspection of Brake While traveling, depress the brake pedal firmly to make sure that the brake is applied effectively.

  • Page 184: Bearing

    LM551 Main Vehicle Brake caliper (CCW) Bearing This is mounted to the top side of the right front wheel and to the bottom side of the Replacement of The Kingpin Bearing left front wheel. If the bearing and O-ring become damaged...
  • Page 185 LM551 Main Vehicle Apply grease to the kingpin shaft. zd6qac-006 uf49yq-001 Replacement of The Kingpin Bearing_005 Replacement of The Kingpin Bearing_003 Shaft washer Kingpin shaft Housing washer Secured bearing inner diameter side After inserting the O-ring on the kingpin Secured bearing outer diameter side shaft, install the thrust bearing shaft washer, ball, and housing washer in order.

  • Page 186: Wire

    LM551 Main Vehicle Remove the step cover. Wire Replacement of The Brake Wire Caution If the brake wire is severed, the machine will be unable to stop. If there are cracks, damage or other defects in the brake wire, replace it immediately.

  • Page 187: Pivot

    LM551 Main Vehicle Tighten all bolts of the front tires to their Brake wire specified torque. Cotter pin Note: Washer Bolt tightening torque: 67 - 85 N-m (683.20 Flat-head pin - 866.75 kgf-cm) Start the engine and drive to check the Loosen the caliper side adjustment bolt following.
  • Page 188 LM551 Main Vehicle Install the bearing puller on the bushing to To install the bushing to the pivot, use a be removed. driver and press-fit the bushing with a press. xpxxkw-007 Replacement of Bushing_002 Bearing puller Bushing Caution Be careful not to pinch your hand with the xpxxkw-009 sliding hammer.

  • Page 189: Arm

    LM551 Main Vehicle Secure the arm on a vise table. Note: Protect the arm with waste cloth to prevent Replacement of Bushing it becoming damaged. If the bushing becomes damaged due to wear, insufficient lubrication, or due to water penetration, the bushing may develop looseness and the arm will not move smoothly.
  • Page 190 LM551 Main Vehicle Caution Bushing Be careful not to pinch your hand with the Driver sliding hammer. Press Slide the sliding hammer and remove the bushing. xpxxkw-004 Replacement of Bushing_005 Sliding hammer Bushing To install the bushing to the arm, use a driver and press-fit the bushing with a press.

  • Page 191: Troubleshooting

    LM551 Troubleshooting Engine Related ........Page 7-2 Main Vehicle Related ......Page 7-5 Mower Unit Related ....... Page 7-8 Page 7-1...

  • Page 192: Engine Related

    LM551 Troubleshooting Engine Related Problem Cause Reference The interlock system was activated (not sitting on Electrical System - the seat, parking brake not applied, reel rotation Electrical System Outline - switch not set to the "OFF" position, or traveling Interlock System pedal not in neutral).
  • Page 193 LM551 Troubleshooting Problem Cause Reference Electrical System - Electrical Components - Insufficient battery capacity or loose terminals General Inspection and Repair - Battery Electrical System - Faulty ignition key switch Electrical Components - Key Switch Engine Maintenance Faulty stop solenoid...
  • Page 194 LM551 Troubleshooting Problem Cause Reference Electrical System - Measurement - Battery Faulty battery Electrical System - General Inspections/Repairs - Battery No charge This machine's Owner's Insufficient fan belt tension Operating Manual Disconnected coupler in charging circuit wire or Inspect and repair the wire...

  • Page 195: Main Vehicle Related

    LM551 Troubleshooting Main Vehicle Related Problem Cause Reference This machine's Owner's Engine rpm is slow. Operating Manual Engine Maintenance Engine does not run smoothly Manual This machine's Owner's The parking brake is applied Operating Manual This machine's Owner's The unload valve is not completely closed...
  • Page 196 LM551 Troubleshooting Problem Cause Reference It does not travel (in the case Malfunction of the joint part between the engine where the aforementioned causes Replacement of the joint and pump do not exist). Main Vehicle - Adjustment - Malfunction of neutral of the piston pump...
  • Page 197 LM551 Troubleshooting Problem Cause Reference Tire pressure is low Reference - Specifications Maintenance Standards Lack of grease on the kingpin and Maintenance - Greasing - Greasing Points This machine's Owner's Amount of hydraulic oil is low Operating Manual Replacement of hydraulic...

  • Page 198: Mower Unit Related

    LM551 Troubleshooting Mower Unit Related Problem Cause Reference Malfunction of stack valve Repair and replacement of the stack valve Malfunction of the electro-magnetic Repair and replacement of the check valve check valve Malfunction of up/down cylinder Repair and replacement of the up/down cylinder...
  • Page 199 LM551 Troubleshooting Problem Cause Reference Hydraulic system - Measurement - Reel rotation circuit Malfunction of gear pump Reel rotation is slow Repair and replacement of the gear pump Engine rpm is slow This machine's Owner's Operating Manual Mower Unit Related...
  • Page 200 LM551 Troubleshooting Page 7-10 Mower Unit Related...

  • Page 201: Reference

    LM551 Reference Specifications ........Page 8-2 Maintenance Schedule ......Page 8-4 List of Consumables ......Page 8-9 Page 8-1...

  • Page 202: Specifications

    LM551 Reference Specifications Model LM551 Mower unit type 22 in 26 in Total length 116.14 in 295 cm ← ← Total width 86.61 in 220 cm ← ← Dimensi Roof 94.09 in 239 cm ← ← Total height Handle 62.99 in 160 cm ←...
  • Page 203 LM551 Reference 10.0 dm (10.0 Coolant volume 2.64 U.S.gals ← ← 30.3 dm (30.3 Hydraulic tank capacity 8.01 U.S.gals ← ← Operating width (Mowing width) 100.00 in 254 cm 111.02 in 282 cm 0.197 - 0.787 LH52 5.0 - 20.0 mm ←...

  • Page 204: Maintenance Schedule

    LM551 Reference Maintenance Schedule LM551 Follow the maintenance schedule below. ○・・・Inspect, adjust, supply, clean ●・・・Replace (first time) △・・・Replace Maintenance Item Remarks Check engine oil level and ○ 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　...
  • Page 205 LM551 Reference Maintenance Item Remarks Clean radiator 　 　 ○ 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 screen Clean radiator core 　 ○ 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　...
  • Page 206 LM551 Reference Maintenance Item Remarks whichever comes earlier Air cleaner Clean air cleaner should be element (Replace 　 　 　 　 ○ 　 　 　 　 　 　 　 　 　 △ 　 　 　 cleaned more the element after 6-...
  • Page 207 LM551 Reference Maintenance Item Remarks Replace hydraulic 500 hours 　 　 　 　 　 ● 　 　 　 △ 　 　 　 　 　 　 　 　 　 oil filter thereafter 100 hours first Replace hydraulic change, every 　 　 　 　 　 ● 　 　 　 △ 　 　 　 　 　 　 　 　 　...
  • Page 208 Replace brake pads 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 △ 　 　 *1: Consult your local Baroness Dealer or local KUBOTA Dealer for this service. ･ The items above (*2 marked) are registered as emission related critical parts by KUBOTA in the ･...

  • Page 209: List Of Consumables

    LM551 Reference List of Consumables The consumables are described below. Important Tools that are appropriate for each replacement operation should be selected. 　 　 Code Part name Qty. Remarks Fan belt PF16282-9701-3 Fan belt 　 Oil filter PF15241-3209-4 Oil filter cartridge 　...
  • Page 210 LM551 Reference 　 　 Code Part name Qty. Remarks For SV08-22MS *Solenoid valve Mower up/down solenoid valve YZ40068514 Seal kit (HF SK08-2N-T/B) HF85482-13COMP/ K3313000680 YZ48889625 Seal kit (HF SK10-4N-MMM) For SV10-40A YZ40078945 Seal kit (HF SK10-2N-T/B) For SVRV10-26 YZ48889624 Seal kit (HF SK10-3N-MM)
  • Page 211 LM551 Reference Code Part name Qty. Remarks 　 　 Proximity switch /#4 mower Proximity switch /#5 mower Proximity switch/Up/down lever (down) K3720000150 Proximity Switch NO V-in Brown Proximity switch/Up/down lever (up) Proximity switch/Traveling pedal application position detection Proximity switch/Neutral K3720000160...
  • Page 212 LM551 Reference Page 8-12 List of Consumables...
  • Page 213 1-26, Miyuki-cho, Toyokawa-city, Tel : +81 - 533 - 84 - 1390 Head Office Fax : +81 - 533 - 84 - 1220 Aichi-pref, 442-8530 JAPAN LM551---SM--GBZ/19K-00-S.K...

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