Kubota LA304 Workshop Manual
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Kubota LA304 Workshop Manual

Kubota LA304 Workshop Manual

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WORKSHOP MANUAL
FRONT LOADER
LA304,LA364
KiSC issued 03, 2008 A

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  • Page 1 WORKSHOP MANUAL FRONT LOADER LA304,LA364 KiSC issued 03, 2008 A...
  • Page 2 This Workshop Manual has been prepared to provide servicing personnel with information on the mechanism, service and maintenance of KUBOTA Front Loader LA304 and LA364. It is divided into three parts, “General”, “Mechanism” and “Servicing”. General Information on the tractor identification, the general precautions, maintenance check list, check and maintenance and special tools are described.

  • Page 3: Safety First

    LA304, LA364, WSM SAFETY INSTRUCTIONS SAFETY INSTRUCTIONS 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 4 LA304, LA364, WSM SAFETY INSTRUCTIONS SAFETY STARTING • Do not start the engine by shorting across starter terminals or bypassing the safety start switch. • Unauthorized modifications to the engine may impair the function and / or safety and affect engine life.
  • Page 5 LA304, LA364, WSM SAFETY INSTRUCTIONS AVOID FIRES • Fuel is extremely flammable and explosive under certain conditions. Do not smoke or allow flames or sparks in your working area. • To avoid sparks from an accidental short circuit, always disconnect the battery negative cable first and connect it last.
  • Page 6 LA304, LA364, WSM SAFETY INSTRUCTIONS PREPARE FOR EMERGENCIES • Keep a first aid kit and fire extinguisher handy at all times. • Keep emergency numbers for doctors, ambulance service, hospital and fire department near your telephone. KiSC issued 03, 2008 A...

  • Page 7: Safety Decals

    LA304, LA364, WSM SAFETY INSTRUCTIONS 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.

  • Page 8: Loader Terminology

    LA304, LA364, WSM LOADER TERMINOLOGY LOADER TERMINOLOGY (1) Loader Control Lever (6) Boom Cylinder (2) Side Frame (7) Main Frame (3) Boom (8) Mounting Pin (4) Bucket Cylinder (9) Lock Lever (5) Bucket W10120330 KiSC issued 03, 2008 A...

  • Page 9: Loader Specifications

    LA304, LA364, WSM SPECIFICATIONS SPECIFICATIONS Suitable Tractor Loader Model LA304 LA364 Tractor Model B2320 B2620, B2920 W1029088 [1] LOADER SPECIFICATIONS Loader Model LA304 LA364 Tractor Model B2320 B2620, B2920 Wheel Base 1563 mm (61.5 in.) Front Tires 6 - 12...
  • Page 10 LA304, LA364, WSM SPECIFICATIONS DIMENSIONAL AND OPERATIONAL SPECIFICATIONS Dimensional Specifications Loader Model LA304 LA364 Tractor Model B2320 B2620, B2920 Maximum lift height (To bucket pivot pin) 1880 mm (74.0 in.) 1995 mm (78.6 in.) Maximum lift height under level bucket 1737 mm (68.4 in.)

  • Page 11: Table Of Contents

    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 (FOR FRONT LOADER AND BACKHOE) ..............G-4 [2] STUD BOLTS.................... G-4 [3] AMERICAN STANDARD SCREWS, BOLTS AND NUTS WITH UNC OR UNF THREADS .................

  • Page 12: Loader Identification

    LA304, LA364, WSM G GENERAL 1. LOADER IDENTIFICATION When contacting your local KUBOTA distributor, always specify front loader serial number (1). (1) Serial Number W1010477 KiSC issued 03, 2008 A...

  • Page 13: General Precautions

    Screws, bolts and nuts should be replaced in their original positions to prevent reassembly errors. • When special tools are required, use genuine KUBOTA tools. Special tools which are not used frequently should be made according to the drawings provided.

  • Page 14: Lubricants

    3.3 Imp.gals Grease nipples Until grease overflows. Moly Ep type grease** * KUBOTA original transmission hydraulic fluid ** “Extreme pressure” and containing Molybdenum disulfide is recommended. This grease may specify “Moly Ep” on it’s label. KiSC issued 03, 2008 A...

  • Page 15: Tightening Torques

    LA304, LA364, WSM G GENERAL 4. TIGHTENING TORQUES [1] GENERAL USE SCREWS, BOLTS AND NUTS (FOR FRONT LOADER AND BACKHOE) Screws, bolts, and nuts whose tightening torques are not specified in this Workshop Manual should be tightened according to the table below.

  • Page 16: American Standard Screws, Bolts And Nuts With Unc Or Unf Threads

    LA304, LA364, WSM G GENERAL [3] AMERICAN STANDARD SCREWS, BOLTS AND NUTS WITH UNC OR UNF THREADS SAE GR.5 SAE GR.8 Grade Unit Nominal N·m kgf·m lbf·ft N·m kgf·m lbf·ft Diameter 11.7 to 15.7 1.19 to 1.61 8.61 to 11.6 16.3 to 19.7...

  • Page 17: Hydraulic Fittings

    LA304, LA364, WSM G GENERAL [5] HYDRAULIC FITTINGS Adapters, Elbows and Others Tightening torque Item Shape Thread size N·m kgf·m lbf·ft 9/16 37 to 44 3.8 to 4.5 27 to 33 Adjustable elbow, Adapter (O-ring 48 to 54 4.9 to 5.5...

  • Page 18: Maintenance Check List

    LA304, LA364, WSM G GENERAL 5. MAINTENANCE CHECK LIST To keep the machine working in good condition as well as to avoid any accident and trouble, carry out periodic inspection and maintenance. Check the following points before use. Service Interval...

  • Page 19: Check And Maintenance

    2. If the level is too low, add new oil to the prescribed level at the dipstick (2). IMPORTANT • Use only KUBOTA SUPER UDT fluid. • Use of other oils may damage the transmission or hydraulic system. Refer to “3. LUBRICANTS”.

  • Page 20: Check Points Of Every 10 Hours

    LA304, LA364, WSM G GENERAL [2] CHECK POINTS OF EVERY 10 HOURS Greasing 1. Inject grease in all grease fittings with a hand grease gun. W1011132 Lubricating 1. Lubricate joints of control lever linkage. W1011274 KiSC issued 03, 2008 A...

  • Page 21: Check Points Of Every 50 Hours

    LA304, LA364, WSM G GENERAL [3] CHECK POINTS OF EVERY 50 HOURS Checking Main Frame Mounting Bolts and Nuts Torque CAUTION • Never operate front loader with a loose main frame. • Any time bolts and nuts are loosened, retighten to specified torque.
  • Page 22 MECHANISM CONTENTS 1. HYDRAULIC CIRCUIT ..................M-1 2. CONTROL VALVE ASSEMBLY..............M-2 [1] STRUCTURE ..................... M-2 [2] OPERATION ....................M-3 KiSC issued 03, 2008 A...

  • Page 23: Hydraulic Circuit

    LA304, LA364, WSM FRONT LOADER 1. HYDRAULIC CIRCUIT (1) Bucket Control Valve (4) Boom Cylinder : P Port a : From Pump (2) Control Valve Assembly (5) Boom Control Valve : T Port b : To Three Points Hydraulic (3) Bucket Cylinder...

  • Page 24: Control Valve Assembly

    LA304, LA364, WSM FRONT LOADER 2. CONTROL VALVE ASSEMBLY [1] STRUCTURE (1) Inlet and Outlet Section (5) Spool P : P Port B1 : B1 Port (2) Boom Control Valve (6) Spool T : T Port B2 : B2 Port...

  • Page 25: Operation

    LA304, LA364, WSM FRONT LOADER [2] OPERATION Control lever at “Neutral” position (1) Boom Control Section (5) PB Passage 1 T : T Port B1 : B1 Port (2) Bucket Control Section (6) PB Passage 2 P : P Port...
  • Page 26 LA304, LA364, WSM FRONT LOADER Control lever at “Up” position (1) Boom Control Section (5) Neutral Passage 1 P : P Port A1 : A1 Port (2) Bucket Control Section (6) Load Check Valve T : T Port (From Boom Cylinder)
  • Page 27 LA304, LA364, WSM FRONT LOADER Control lever at “Down” position (1) Boom Control Section (5) Neutral Passage 1 P : P Port A1 : A1 Port (To Boom Cylinder) (2) Bucket Control Section (6) Load Check Valve T : T Port...
  • Page 28 LA304, LA364, WSM FRONT LOADER Control lever at “Floating” position (1) Boom Control Section (5) Detent Mechanism P : P Port A1 : A1 Port (2) Bucket Control Section (6) Neutral Passage 1 T : T Port B1 : B1 Port...
  • Page 29 LA304, LA364, WSM FRONT LOADER Control lever at “Roll-back” position (1) Boom Control Section (6) PB Passage 2 P : P Port B2 : B2 Port (2) Bucket Control Section (7) Load Check Valve T : T Port (To Bucket Cylinder)
  • Page 30 LA304, LA364, WSM FRONT LOADER Control lever at “Dump 1” position (1) Boom Control Section (6) PB Passage 2 P : P Port A2 : A2 Port (2) Bucket Control Section (7) Load Check Valve T : T Port (To Bucket Cylinder)
  • Page 31 LA304, LA364, WSM FRONT LOADER Control lever at “Dump 2” position (1) Boom Control Section (6) PB Passage 2 P : P Port A2 : A2 Port (2) Bucket Control Section (7) Load Check Valve T : T Port (To Bucket Cylinder)
  • Page 32 SERVICING CONTENTS 1. TROUBLESHOOTING ..................S-1 2. SERVICING SPECIFICATIONS ..............S-2 3. TIGHTENING TORQUES ................S-3 4. DISMOUNTING FRONT LOADER FROM TRACTOR........S-4 5. CHECKING, DISASSEMBLING AND SERVICING........S-6 [1] CHECKING AND ADJUSTING ..............S-6 [2] DISASSEMBLING AND ASSEMBLING............S-7 (1) Removing Front Loader Control Valve Assembly .........S-7 (2) Disassembling Front Loader Control Valve and Relief Valve ....S-8 (3) Bucket, Boom and Hydraulic Cylinder ..........S-9 (4) Removing Side Frame, Front Guard and Main Frame......S-10...

  • Page 33: Troubleshooting

    LA304, LA364, WSM FRONT LOADER 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Boom Does Not Rise Control valve malfunctioning Repair or replace – Boom cylinder defective Repair or replace Control lever linkage defective Repair or replace – Hydraulic pump malfunctioning Repair or replace –...

  • Page 34: Servicing Specifications

    LA304, LA364, WSM FRONT LOADER 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Relief Valve Setting Pressure Condition 13.7 to 14.4 MPa • Engine Speed : 140 to 146 kgf/cm – Approx. 2800 min (rpm) 1990 to 2080 psi • Oil Temperature : 50 °C (122 °F)

  • Page 35: Tightening Torques

    LA304, LA364, WSM FRONT LOADER 3. TIGHTENING TORQUES [LA304] Item N·m kgf·m lbf·ft Rear wheel mounting nut 145 to 150 14.8 to 15.3 107 to 111 Front loader pipe joint bolt 48 to 56 4.9 to 5.7 36 to 41...

  • Page 36: Dismounting Front Loader From Tractor

    LA304, LA364, WSM FRONT LOADER 4. DISMOUNTING FRONT LOADER FROM TRACTOR IMPORTANT • When dismounting the loader, park the tractor on flat and hard ground, apply the parking brake. • When starting the engine or using the hydraulic control valve, always sit on the operator’s seat.
  • Page 37 LA304, LA364, WSM FRONT LOADER 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 38: Checking, Disassembling And Servicing

    LA304, LA364, WSM FRONT LOADER 5. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Relief Valve Setting Pressure 1. Remove the protective plug (1). 2. Install the adaptor. Then connect the cable and the pressure gauge to the adaptor (Size 1/4).

  • Page 39: Disassembling And Assembling

    LA304, LA364, WSM FRONT LOADER [2] DISASSEMBLING AND ASSEMBLING (1) Removing Front Loader Control Valve Assembly Rear Wheel, Fender and Seat Under Cover 1. Place the disassembling stand under the transmission case. 2. Remove the rear wheel mounting nuts. 3. Remove the rear wheel, R.H. (6).

  • Page 40: Disassembling Front Loader Control Valve And Relief Valve

    LA304, LA364, WSM FRONT LOADER (2) Disassembling Front Loader Control Valve and Relief Valve (1) Dust Seal (11) Backup Ring (21) Collar (31) Ring (2) Valve Body (12) Collar (22) Backup Ring (32) Stopper (3) Spool for Boom (13) Spring Holder 1...

  • Page 41: Bucket, Boom And Hydraulic Cylinder

    LA304, LA364, WSM FRONT LOADER (3) Bucket, Boom and Hydraulic Cylinder Bucket 1. Remove the pins (2) and remove the bucket (1). (1) Bucket (2) Pin W1020851 Hydraulic Cylinder and Hydraulic Hoses 1. Disconnect the hydraulic hoses (1). 2. Remove the pins and remove the bucket cylinders (4).

  • Page 42: Removing Side Frame, Front Guard And Main Frame

    LA304, LA364, WSM FRONT LOADER (4) Removing Side Frame, Front Guard and Main Frame Side Frame 1. Disconnecting the loader assembly from the main frame. (See page S-4.) 2. Remove the pin (1) and remove the side frame (2) from the boom.

  • Page 43: Disassembling Cylinder Rod And Cylinder Head

    LA304, LA364, WSM FRONT LOADER (5) Disassembling Cylinder Rod and Cylinder Head Piston Rod Assembly 1. Drain hydraulic oil from the cylinder, and secure the tube end of the cylinder in a vise. 2. Unscrew the cylinder head (1) with the adjustable gland nut wrench (4).
  • Page 44 LA304, LA364, WSM FRONT LOADER 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 45 LA304, LA364, WSM FRONT LOADER Installing Expander and Piston Seal 1. Place the slide jig (2) on the piston (4). 2. Install the expander (3) on the piston using the slide jig. 3. Install the piston seal (1) over the expander using the slide jig.

  • Page 46: Servicing

    LA304, LA364, WSM FRONT LOADER [3] SERVICING (1) Pin, Pin Hole and Piston Rod Clearance between Pin and Bushing or Pin Holes 1. Measure the pin O.D. with an outside micrometer. 2. Measure the pin holes I.D.with a cylinder gauge.
  • Page 47 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 : ksos-pub@kubota.co.jp KUBOTA Corporation Printed in Japan 2008. 03, S, EI, EI, e Code No.9Y111-01670...

This manual is also suitable for:

La364B2320B2620B2920

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