Kubota LA555 Workshop Manual
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Kubota LA555 Workshop Manual

Kubota LA555 Workshop Manual

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WORKSHOP MANUAL
FRONT LOADER
LA555,LA805,LA1055
KiSC issued 05, 2015 A

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Summary of Contents for Kubota LA555

  • Page 1 WORKSHOP MANUAL FRONT LOADER LA555,LA805,LA1055 KiSC issued 05, 2015 A...
  • Page 2 TO THE READER This Workshop Manual tells the servicing personnel about the mechanism, servicing and maintenance of KUBOTA Front Loader LA555, LA805 and LA1055. It contains 4 parts: "Information", "General", "Mechanism" and "Servicing".  Information This section primarily contains information below.
  • Page 3 Record of Revisions For pdf, use search function {Search word} to find all the revised locations. Last digit Issue Reference of the Main Revised Point and Corrective Measures {Search word} month Page Code No. 2015.05 Changed the ELECTRICAL CIRCUIT. 1-M9 KiSC issued 05, 2015 A...
  • Page 4 INFORMATION KiSC issued 05, 2015 A...

  • Page 5: Table Of Contents

    INFORMATION CONTENTS 1. SAFETY FIRST ..........................I-1 2. SAFETY DECALS .......................... I-4 3. LOADER TERMINOLOGY ......................I-7 4. SPECIFICATIONS.......................... I-8 [1] LOADER SPECIFICATIONS ....................I-8 [2] BUCKET SPECIFICATIONS ....................I-8 [3] DIMENSIONAL AND OPERATIONAL SPECIFICATIONS............I-9 KiSC issued 05, 2015 A...

  • Page 6: Safety First

    INFORMATION LA555,LA805,LA1055, WSM 1. SAFETY FIRST SAFETY FIRST • This symbol, the industry's "Safety Alert Symbol", is used throughout this manual and on labels on the machine itself to warn of the possibility of personal injury. Read these instructions carefully.
  • Page 7 INFORMATION LA555,LA805,LA1055, WSM OPERATE SAFELY • Do not use the machine after you consume alcohol or medication or when you are tired. • Put on applicable clothing and safety equipment. • Use applicable tools only. Do not use alternative tools or parts.
  • Page 8 INFORMATION LA555,LA805,LA1055, WSM KEEP A GOOD AIRFLOW IN THE WORK AREA • If the engine is in operation, make sure that the area has good airflow. Do not operate the engine in a closed area. The exhaust gas contains poisonous carbon monoxide.

  • Page 9: Safety Decals

    INFORMATION LA555,LA805,LA1055, WSM 2. SAFETY DECALS The following safety decals are installed on the machine. If a decal becomes damaged, illegible or is not on the machine, replace it. The decal part number is listed in the parts list. WSM000001INI0013US0...
  • Page 10 INFORMATION LA555,LA805,LA1055, WSM 9Y1210861INI0002US0 KiSC issued 05, 2015 A...
  • Page 11 INFORMATION LA555,LA805,LA1055, WSM 9Y1210861INI0003US0 CARE OF DANGER, WARNING AND CAUTION LABELS 1. Keep danger, warning and caution labels clean and free from obstructing material. 2. Clean danger, warning and caution labels with soap and water, dry with a soft cloth.

  • Page 12: Loader Terminology

    INFORMATION LA555,LA805,LA1055, WSM 3. LOADER TERMINOLOGY (1) Hydraulic Control Lever (3) Mounting Pin (5) Boom Cylinder (7) Bucket Cylinder (2) Sub Frame (4) Main Frame (6) Boom (8) Bucket 9Y1210861INI0005US0 KiSC issued 05, 2015 A...

  • Page 13: Specifications

    Net Weight (Approximate) 455 kg (1003 lbs) 580 kg (1279 lbs) 640 kg (1411 lbs) 9Y1210861INI0007US0 [2] BUCKET SPECIFICATIONS Loader Model LA555 LA805 LA555, LA805, LA1055 Round 72" Model Square 66" Square 72" Square 72" Light Material Type Quick Attach Quick Attach...

  • Page 14: Dimensional And Operational Specifications

    INFORMATION LA555,LA805,LA1055, WSM [3] DIMENSIONAL AND OPERATIONAL SPECIFICATIONS Dimensional Specifications Loader Model LA555 LA805 LA1055 Tractor Model L3560 L4060 L6060 Maximum lift height (To bucket pivot pin) 2448 mm (96.4 in.) 2659 mm (104.7 in.) 2863 mm (112.7 in.) Maximum lift height under level bucket 2277 mm (89.6 in.)
  • Page 15 GENERAL KiSC issued 05, 2015 A...
  • Page 16 GENERAL CONTENTS 1. LOADER IDENTIFICATION ......................G-1 2. GENERAL PRECAUTIONS......................G-2 3. LUBRICANTS ..........................G-3 4. TIGHTENING TORQUES......................G-4 [1] GENERAL USE SCREWS, BOLTS AND NUTS ..............G-4 [2] STUD BOLTS ......................... G-4 [3] AMERICAN STANDARD SCREWS, BOLTS AND NUTS WITH UNC OR UNF THREADS ..........................

  • Page 17: Loader Identification

    GENERAL LA555,LA805,LA1055, WSM 1. LOADER IDENTIFICATION When contacting your local KUBOTA distributor, always specify front loader serial number (1). (1) Serial Number 9Y1210861GEG0001US0 KiSC issued 05, 2015 A...

  • Page 18: General Precautions

    • When it is necessary to use special tools, use KUBOTA special tools. Refer to the drawings when you make special tools that you do not use frequently.

  • Page 19: Lubricants

    Grease fittings Until grease overflows Moly Ep type grease** NOTE • * KUBOTA original transmission hydraulic fluid. • ** "Extreme pressure" and containing Molybdenum disulfide is recommended. This grease may specify "Moly Ep" on it's label. 9Y1210861GEG0002US0 KiSC issued 05, 2015 A...

  • Page 20: Tightening Torques

    GENERAL LA555,LA805,LA1055, WSM 4. TIGHTENING TORQUES [1] GENERAL USE SCREWS, BOLTS AND NUTS Tighten screws, bolts and nuts whose tightening torques are not specified in this Workshop Manual according to the table below. Indication on top of bolt No-grade or 4T 7T or Property class 8.8...

  • Page 21: American Standard Screws, Bolts And Nuts With Unc Or Unf Threads

    GENERAL LA555,LA805,LA1055, WSM [3] AMERICAN STANDARD SCREWS, BOLTS AND NUTS WITH UNC OR UNF THREADS Grade SAE GR.5 SAE GR.8 Unit N·m kgf·m lbf·ft N·m kgf·m lbf·ft 11.7 to 15.7 1.20 to 1.60 8.63 to 11.5 16.3 to 19.7 1.67 to 2.00 12.0 to 14.6...

  • Page 22: Hydraulic Fittings

    GENERAL LA555,LA805,LA1055, WSM [5] HYDRAULIC FITTINGS (1) Adaptors, Elbows and Others Tightening torque Item Shape Thread size N·m kgf·m lbf·ft 37 to 44 3.8 to 4.4 28 to 32 9/16 Adjustable elbow, 48 to 54 4.9 to 5.5 36 to 39...

  • Page 23: Maintenance Check List

    GENERAL LA555,LA805,LA1055, WSM 5. MAINTENANCE CHECK LIST To keep the machine working in good condition as well as to avoid any accident and trouble, do periodic inspection and maintenance. Check the following points before use. Service Interval Check Points Reference page...

  • Page 24: Check And Maintenance

    2. If the level is too low, add new oil to the prescribed level at the oil. IMPORTANT • Use only KUBOTA UDT or SUPER UDT fluid. Use of other oils may damage the transmission or hydraulic system. Refer to "3. LUBRICANTS" on page G-3.

  • Page 25: Check Points Of Every 20 To 30 Hours

    GENERAL LA555,LA805,LA1055, WSM [3] CHECK POINTS OF EVERY 20 TO 30 HOURS Re-tightening of Hardware After 20 to 30 hours of initial loader operation, re-tighten all mounting bolts and nuts to the required torque value as follows. Main frames bolts (M16) 226 N·m...

  • Page 26: Front Loader

    FRONT LOADER KiSC issued 05, 2015 A...
  • Page 27 MECHANISM CONTENTS 1. HYDRAULIC CIRCUIT ....................... 1-M1 2. CONTROL VALVE ASSEMBLY ....................1-M2 [1] STRUCTURE ........................1-M2 [2] OPERATION ........................1-M3 (1) Neutral ..........................1-M3 3. 3rd. FUNCTION VALVE (OPTION) .................... 1-M4 [1] HYDRAULIC CIRCUIT ......................1-M4 [2] 3rd. FUNCTION SOLENOID VALVE OPERATION ............. 1-M5 (1) Neutral ..........................

  • Page 28: Hydraulic Circuit

    FRONT LOADER LA555,LA805,LA1055, WSM 1. HYDRAULIC CIRCUIT (1) Relief Valve Pump Port A1: A1 Port To Hydraulic Block (2) Boom Control Valve Tank Port A2: A2 Port (3) Bucket Control Valve B1: B1 Port (4) Front Loader Control Valve B2: B2 Port...

  • Page 29: Control Valve Assembly

    FRONT LOADER LA555,LA805,LA1055, WSM 2. CONTROL VALVE ASSEMBLY [1] STRUCTURE (1) Inlet and Outlet Section Pump Port A1: A1 Port B1: B1 Port (2) Boom Control Valve Tank Port A2: A2 Port B2: B2 Port (3) Bucket Control Valve PB: Power Beyond Port...

  • Page 30: Operation

    FRONT LOADER LA555,LA805,LA1055, WSM [2] OPERATION (1) Neutral (1) Boom Control Section (5) PB Passage 1 Tank Port B1: B1 Port (2) Bucket Control Section (6) PB Passage 2 Pump Port B2: B2 Port (3) Spool (7) Load Check Valve...

  • Page 31: Rd. Function Valve (Option)

    FRONT LOADER LA555,LA805,LA1055, WSM 3. 3rd. FUNCTION VALVE (OPTION) [1] HYDRAULIC CIRCUIT (1) Hydraulic Pump (5) Boom Cylinder Pump Port A Port (2) 3rd Function Valve Assembly (6) Bucket Cylinder PB: Power Beyond Port A1: A1 Port (3) Relief Valve...

  • Page 32: 3Rd. Function Solenoid Valve Operation

    FRONT LOADER LA555,LA805,LA1055, WSM [2] 3rd. FUNCTION SOLENOID VALVE OPERATION (1) Neutral (1) Spring (3) Spring A Port PB: Power Beyond Port (2) Spool B Port Tank Port Pump Port To Front Loader Valve 1. In neutral, the spool (2) is at the center position with the right and left springs (1), (3).

  • Page 33: Button A Is Pushed (Activation Switch A)

    FRONT LOADER LA555,LA805,LA1055, WSM (2) Button A is Pushed (Activation Switch A) (1) Coil A Port (To Implement) Pump Port To Front Loader (2) Spool B Port (From Implement) PB: Power Beyond Port 1. Current passes through the coil (1) while the button A is pressed.

  • Page 34: Button B Is Pushed (Activation Switch B)

    FRONT LOADER LA555,LA805,LA1055, WSM (3) Button B is Pushed (Activation Switch B) (1) Spool A Port (From Implement) Pump Port To Front Loader (2) Coil B Port (To Implement) PB: Power Beyond Port 1. Current passes through the coil (2) while the button B is pressed.

  • Page 35: 3Rd. Function Relief Valve

    FRONT LOADER LA555,LA805,LA1055, WSM [3] 3rd. FUNCTION RELIEF VALVE Relief Valve Closed This relief valve is suitable for a high pressure and large volumetric flow, and has better pressure override performance than direct acting relief valves. This relief valve consists of a pilot valve (4) and main valve (8).

  • Page 36: Electrical Circuit

    FRONT LOADER LA555,LA805,LA1055, WSM [4] ELECTRICAL CIRCUIT (1) Relay 1 (3) Solenoid Valve 1 (5) ON - OFF Switch (Front (7) Activation Switch B (2) Relay 2 (4) Solenoid Valve 2 Hydraulic Valve Main Switch) (8) Battery (6) Activation Switch A Color of Wiring B ...
  • Page 37 SERVICING CONTENTS 1. TROUBLESHOOTING.........................1-S1 2. SERVICING SPECIFICATIONS ....................1-S2 3. TIGHTENING TORQUES......................1-S3 4. DISMOUNTING FRONT LOADER FROM TRACTOR ..............1-S4 [1] STAND AND SIDE FRAME ....................1-S4 [2] HYDRAULIC HOSE.......................1-S5 (1) Standard Type .........................1-S5 (2) Multi-Coupler Type (Option) ....................1-S6 [3] ATTACHING THE LOADER ....................1-S10 5.

  • Page 38: Troubleshooting

    FRONT LOADER LA555,LA805,LA1055, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Control valve malfunctioning Repair or replace 1-S11 Boom Does Not Rise Boom cylinder damaged Repair or replace 1-S15, 1-S16 Control lever linkage damaged Repair or replace 1-S11 Hydraulic pump malfunctioning Repair or replace –...

  • Page 39: Servicing Specifications

    FRONT LOADER LA555,LA805,LA1055, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Relief Valve Setting Pressure 17.1 to 18.1 MPa – 175 to 184 kgf/cm Condition [L3560] • Engine Speed 2480 to 2620 psi [Manual Model and GST Model] Approx. 2700 min...

  • Page 40: Tightening Torques

    FRONT LOADER LA555,LA805,LA1055, WSM 3. TIGHTENING TORQUES [LA555] Item N·m kgf·m lbf·ft Boom and bucket cylinder head mounting torque 200 to 230 20.4 to 23.4 148 to 169 Boom and bucket cylinder piston mounting nut 150 to 180 15.3 to 18.3...

  • Page 41: Dismounting Front Loader From Tractor

    FRONT LOADER LA555,LA805,LA1055, WSM 4. DISMOUNTING FRONT LOADER FROM TRACTOR CAUTION To avoid personal injury: • Make sure an approved bucket is attached before removing the loader from the tractor. • For removing the loader, choose flat and hard ground, preferably concrete.

  • Page 42: Hydraulic Hose

    FRONT LOADER LA555,LA805,LA1055, WSM [2] HYDRAULIC HOSE (1) Standard Type Hoses 1. Slowly release all hydraulic pressure by moving the hydraulic control lever in all directions. 2. Disconnect the four hoses with quick couplers at the control valve and place them on the right side of the boom.

  • Page 43: Multi-Coupler Type (Option)

    FRONT LOADER LA555,LA805,LA1055, WSM (2) Multi-Coupler Type (Option) [A] 2P Multi-Coupler Hydraulic Hoses CAUTION To avoid personal injury: • Before connecting each, ensure to carefully clean the mating surfaces of the fixed part, of the mobile part and reference pins.
  • Page 44 FRONT LOADER LA555,LA805,LA1055, WSM (Continued) (When connecting) 1. Open the dust cover of the fixed part (3). 2. Push the safety lock button (2) and turn up the lever (4) until it stops. 3. Put the mobile part (1) on the fixed part (3) and engage the reference pins (6) in the proper holes.
  • Page 45 FRONT LOADER LA555,LA805,LA1055, WSM [B] 4P/8P Multi-Coupler Hydraulic Hoses CAUTION • Before connecting each, ensure to carefully clean the mating surfaces of the fixed part, of the mobile part and reference pins. • Lubricate periodically all the moving components. • Once the mobile part is disconnected, please close the dust cover to keep the flat surface of the fixed part clean.
  • Page 46 FRONT LOADER LA555,LA805,LA1055, WSM (Continued) (When connecting) 1. Open the dust cover of the fixed part (5). 2. Push the safety lock button (1) and turn up the lever (3) until it stops. 3. Put the mobile part (2) on the fixed part (5) and engage the reference pins (6) in the proper holes.

  • Page 47: Attaching The Loader

    FRONT LOADER LA555,LA805,LA1055, WSM [3] ATTACHING THE LOADER Side Frame and Stand CAUTION To avoid personal injury: • Before starting the engine and operating the control valve, always sit in the operator's seat. 1. Slowly drive the tractor between the loader side frames until the rear position of both side frames (1) touches the main frames (2) as shown.

  • Page 48: Checking, Disassembling And Servicing

    FRONT LOADER LA555,LA805,LA1055, WSM 5. CHECKING, DISASSEMBLING AND SERVICING [1] CONTROL VALVE (1) Checking and Adjusting Relief Valve Setting Pressure NOTE • The relief valve is installed on the L60 series tractor. however the relief valve of the tractor hydraulic system is used as the relief valve of the front loader.

  • Page 49: Bucket And Hydraulic Cylinder

    (When attaching attachments) DANGER To avoid serious personal injury death: • Use of a non-Kubota attachment that does not comply with ISO 24410 (SAE standard of J2513) or the improper positioning of handle(s) or non-protrusion of pin(s) may result in detachment of the attachment or deformation, causing loss of performance, personal injury or death.
  • Page 50 FRONT LOADER LA555,LA805,LA1055, WSM Quick Attach Coupler Frame 1. Remove the pins (1) and remove the quick attach coupler frame (2). DANGER • If you install or sell aftermarket implements to the customer, these implements must meet the ISO 24410 (SAE standard of J2513).
  • Page 51 FRONT LOADER LA555,LA805,LA1055, WSM Boom and Hydraulic Cylinders 1. Disconnect the hydraulic hoses from the hydraulic cylinders (3), (4). 2. Remove the pins and remove the hydraulic cylinders (3), (4). 3. Disconnect the hydraulic hoses from the hydraulic tubes on the boom (2).
  • Page 52 FRONT LOADER LA555,LA805,LA1055, WSM Piston Rod Assembly 1. Drain hydraulic oil from the cylinder, and secure the tube end of the cylinder in a vise. 2. Remove the cylinder head (1) with the adjustable gland nut wrench (4). 3. Pull out the piston rod assembly (2) from the cylinder tube (3).
  • Page 53 FRONT LOADER LA555,LA805,LA1055, WSM Cylinder Head, Piston and Nut 1. Secure the rod end in a vise. 2. Remove the nut (4), and remove the piston (3) and cylinder head (2) from the piston rod (1). (When reassembling) • Visually inspect all parts for signs of scoring or damage.
  • Page 54 FRONT LOADER LA555,LA805,LA1055, WSM Removing Piston Seal and O-ring 1. Remove the piston seal (2) and expander (3) from the piston (1). IMPORTANT • When installing the expander (3) and piston seal (2) to the piston (1), use the slide jig and correcting jig as shown in the figure.

  • Page 55: Servicing

    FRONT LOADER LA555,LA805,LA1055, WSM (1) Servicing Piston Rod Bend 1. Place piston rod on V blocks. 2. Set a dial indicator on the center of the rod. 3. Turn the piston rod and read the dial indicator. 4. If the measurement exceeds the allowable limit, replace it.
  • Page 56 FRONT LOADER LA555,LA805,LA1055, WSM Main Frame and Sub Frame (1) Main Frame, RH (2) Sub Frame, RH (3) Sub Frame, LH (4) Main Frame, LH 1. Support the main frame (1), (4) by hoist to prevent failing during disassembling. 2. Remove the sub frame mounting bolts and nuts, and remove the sub frame (2), (3).

  • Page 57: 3Rd Function Valve (Option)

    FRONT LOADER LA555,LA805,LA1055, WSM [4] 3RD FUNCTION VALVE (OPTION) (1) Checking and Adjusting Relief Valve Setting Pressure Tester (Coupler) 1. Assemble the relief valve set adaptor and pressure gauge (30 MPa). 2. Connect the assembled adaptor to delivery port (1).
  • Page 58 FRONT LOADER LA555,LA805,LA1055, WSM Solenoid Valve 1. Disconnect the 2P connector (2). 2. Perform the following checks. (1) Solenoid Valve (2) 2P Connector 1) Solenoid Valve 1. Measure the resistance with an ohmmeter between terminal 1 and terminal 2. (Solenoid side) 2.
  • Page 59 FRONT LOADER LA555,LA805,LA1055, WSM ON - OFF Switch (Front Hydraulic Valve Main Switch) 1. Disconnect the ON - OFF switch connector. 2. Perform the following checks. (1) ON - OFF Switch 1) ON - OFF Switch 1. Measure the resistance with an ohmmeter between RB terminal and YR terminal.
  • Page 60 EDITOR : KUBOTA FARM & INDUSTRIAL MACHINERY SERVICE, LTD. 64, ISHIZU-KITAMACHI, SAKAI-KU, SAKAI-CITY, OSAKA, 590-0823, JAPAN PHONE : ( 81 ) 72-241-1129 : ( 81 ) 72-245-2484 E-mail : ks_g.ksos-pub@kubota.com Printed in Japan 2015. 05, S, EI, EI, engusa Code No.9Y111-08611 2013.

This manual is also suitable for:

La805La1055

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