Kubota WSM BH77 Workshop Manual
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Kubota WSM BH77 Workshop Manual

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WORKSHOP MANUAL
BACKHOE
BH77
KiSC issued 08, 2014 A

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Summary of Contents for Kubota WSM BH77

  • Page 1 WORKSHOP MANUAL BACKHOE BH77 KiSC issued 08, 2014 A...
  • Page 2 All illustrations, photographs and specifications contained in this manual are of the newest information available at the time of publication. KUBOTA reserves the right to change all information at any time without notice. Since this manual includes many models, information or illustrations and photographs can show more than one model.
  • 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. 2014.08 Add new adaptable tractor {B2650, B3350, B3350SU, L2501, L3301, L3901} KiSC issued 08, 2014 A...
  • Page 4 INFORMATION KiSC issued 08, 2014 A...
  • Page 5 INFORMATION CONTENTS 1. SAFETY FIRST ..........................I-1 2. SAFETY DECALS .......................... I-4 3. TERMINOLOGY ..........................I-6 4. SPECIFICATIONS.......................... I-7 KiSC issued 08, 2014 A...

  • Page 6: Safety First

    INFORMATION BH77, 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 BH77, 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 BH77, 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 BH77, 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 9Y1210544INI0001US0 KiSC issued 08, 2014 A...
  • Page 10 INFORMATION BH77, WSM 9Y1210544INI0002US0 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. 3.

  • Page 11: Terminology

    INFORMATION BH77, WSM 3. TERMINOLOGY (1) Backhoe Bucket (11) Cylinder, Swing (2) Bucket Teeth (12) Stabilizer (3) Link, Bucket (13) Stabilizer Pad (4) Cylinder, Bucket (14) Cylinder, Stabilizer (5) Dipperstick (15) Joystick Control (6) Cylinder, Dipperstick (16) Step (7) Boom (17) Stabilizer Control (8) Cylinder, Boom (18) Swing Lock Pin...

  • Page 12: Specifications

    Angle of Departure per SAE J1234 17.3 deg. Levelling angle 10.2 deg. Undercut 534 mm (21.0 in.) Swing Arc 180 deg. NOTE • The specifications are taken with KUBOTA B3030 tractor. (Tire size: Front 7-12, Rear 12.4-16) KiSC issued 08, 2014 A...

  • Page 13: Hydraulic Cylinders

    INFORMATION BH77, WSM Digging Force (Per SAE J49) With bucket cylinder 15220 N (3421 lbf) With dipperstick cylinder 9738 N (2190 lbf) Cycle Time (Seconds) Boom cylinder, extend Boom cylinder, retract Swing cylinder, from 90 ° to center Dipperstick cylinder, extend Dipperstick cylinder, retract Bucket cylinder, extend Bucket cylinder, retract...
  • Page 14 INFORMATION BH77, WSM Lift Capacity (Per SAE J31) [A] Rated Lift Capacity (Over End)-kg (lbs) Lift capacities shown are 87 % of maximum lift force, according to SAE definition. 9Y1210544INI0006US0 KiSC issued 08, 2014 A...
  • Page 15 GENERAL KiSC issued 08, 2014 A...

  • Page 16: Table Of Contents

    GENERAL CONTENTS 1. BACKHOE 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: Backhoe Identification

    GENERAL BH77, WSM 1. BACKHOE IDENTIFICATION When contacting your local KUBOTA distributor, always specify backhoe serial number. (1) Serial Number 9Y1210544GEG0001US0 KiSC issued 08, 2014 A...

  • Page 18: 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 19: Lubricants

    5.2 Imp.gals Grease fitting 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. 9Y1210544GEG0003US0 KiSC issued 08, 2014 A...

  • Page 20: Tightening Torques

    GENERAL BH77, 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 9T or Property class 10.9...

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

    GENERAL BH77, 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 5/16 23.1 to 27.7...

  • Page 22: Hydraulic Fittings

    GENERAL BH77, WSM [5] HYDRAULIC FITTINGS (1) Adaptors, Elbows and Others Tightening torque Item Shape Thread size N·m kgf·m lbf·ft 9/16 37 to 44 3.8 to 4.4 28 to 32 Adjustable elbow, Adapter (O-ring port) 48 to 54 4.9 to 5.5 36 to 39 (UNF) [A] Nut Type...

  • Page 23: Maintenance Check List

    GENERAL BH77, WSM 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 Check Points Reference page Check the transmission fluid level G-8, G-9...

  • Page 24: Check And Maintenance

    3. Check that the oil level is between the two notches. 4. If the level is too low, fill new oil. IMPORTANT • Use only KUBOTA SUPER UDT-2 fluid. Use of other oils may damage the transmission or hydraulic system. Refer to "3. LUBRICANTS".

  • Page 25: Checking Transmission Fluid Level

    3. Check that the oil level is between the two notches. 4. If the level is too low, fill new oil. IMPORTANT • Use only KUBOTA SUPER UDT-2 fluid. Use of other oils may damage the transmission or hydraulic system. Refer to "3. LUBRICANTS".
  • Page 26 3. Check that the oil level is between the two notches. 4. If the level is too low, fill new oil. IMPORTANT • Use only KUBOTA SUPER UDT-2 fluid. Use of other oils may damage the transmission or hydraulic system. Refer to "3. LUBRICANTS".

  • Page 27: Check Point Of Every 10 Hours

    GENERAL BH77, WSM [2] CHECK POINT OF EVERY 10 HOURS Greasing 1. Inject grease all grease fittings with a hand grease gun. 9Y1210544GEG0009US0 [3] CHECK POINT OF EVERY 50 HOURS Checking Sub Frame Bolt Torque 1. Check sub frame bolts and nuts. If they are loosened, retighten to specified torque.

  • Page 28: Special Tools

    GENERAL BH77, WSM 7. SPECIAL TOOLS Relief Valve Pressure Tester Code No. • 07916-50045 Application • This allows easy measurement of relief set pressure. (1) Gauge (07916-50322) (6) Adaptor C (PS3/8) (07916-50371) (2) Cable (07916-50331) (7) Adaptor D (PT1/8) (07916-50381) (3) Threaded Joint (07916-50401) (8) Adaptor E (PS3/8) (07916-50392) (4) Threaded Joint (07916-50341)
  • Page 29 BACKHOE KiSC issued 08, 2014 A...
  • Page 30 MECHANISM CONTENTS 1. HYDRAULIC CIRCUIT ....................... 1-M1 2. CONTROL VALVE........................1-M2 [1] STRUCTURE ........................1-M2 [2] OPERATION ........................1-M3 (1) Neutral ..........................1-M3 (2) Bucket..........................1-M4 (3) Dipperstick........................1-M6 (4) Stabilizer R.H........................1-M8 (5) Stabilizer L.H........................ 1-M10 (6) Boom ..........................1-M12 (7) Boom Swing .........................

  • Page 31: Hydraulic Circuit

    BACKHOE BH77, WSM 1. HYDRAULIC CIRCUIT (1) Bucket Cylinder (4) Stabilizer Cylinder L.H. (7) Swing Cylinder R.H. From Hydraulic Pump (2) Dipperstick Cylinder (5) Boom Cylinder (8) Backhoe Control Valve To Tank Port (3) Stabilizer Cylinder R.H. (6) Swing Cylinder L.H. 9Y1210544BHM0014US0 1-M1 KiSC issued 08, 2014 A...

  • Page 32: Control Valve

    BACKHOE BH77, WSM 2. CONTROL VALVE [1] STRUCTURE (1) Inlet Section (8) Outlet Section A1: A1 Port B1: B1 Port (2) Bucket Control Valve A2: A2 Port B2: B2 Port (3) Dipperstick Control Valve Pump Port A3: A3 Port B3: B3 Port (4) Stabilizer R.H.

  • Page 33: Operation

    BACKHOE BH77, WSM [2] OPERATION (1) Neutral (1) Inlet Section (9) Overload Relief Valve (Port A1: A1 Port B1: B1 Port (2) Bucket Control Valve Relief Valve) A2: A2 Port B2: B2 Port (3) Dipperstick Control Valve (10) Load Check Valve A3: A3 Port B3: B3 Port (4) Stabilizer R.H.

  • Page 34: Bucket

    BACKHOE BH77, WSM (2) Bucket Roll-back (1) Bucket Cylinder (4) Spool P Port A1: A1 Port (2) Bucket Control Valve (5) Bridge Passage T Port (From Bucket Cylinder) (3) Load Check Valve Low Pressure B1: B1 Port High Pressure (To Bucket Cylinder) 1.
  • Page 35 BACKHOE BH77, WSM Dump (1) Bucket Cylinder (4) Spool P Port A1: A1 Port (2) Bucket Control Valve (5) Bridge Passage T Port (To Bucket Cylinder) (3) Load Check Valve Low Pressure B1: B1 Port High Pressure (From Bucket Cylinder) 1.

  • Page 36: Dipperstick

    BACKHOE BH77, WSM (3) Dipperstick Crowd (1) Dipperstick Cylinder (4) Spool P Port A2: A2 Port (2) Dipperstick Control Valve (5) Bridge Passage T Port (From Dipperstick Cylinder) (3) Load Check Valve Low Pressure B2: B2 Port High Pressure (To Dipperstick Cylinder) 1.
  • Page 37 BACKHOE BH77, WSM Extend (1) Dipperstick Cylinder (4) Spool P Port A2: A2 Port (2) Dipperstick Control Valve (5) Bridge Passage T Port (To Dipperstick Cylinder) (3) Load Check Valve Low Pressure B2: B2 Port High Pressure (From Dipperstick Cylinder) 1.

  • Page 38: Stabilizer R.h

    BACKHOE BH77, WSM (4) Stabilizer R.H. Extend (1) Stabilizer Cylinder R.H. (4) Spool P Port A3: A3 Port (From Stabilizer (2) Stabilizer R.H. Control Valve (5) Bridge Passage T Port R.H. Cylinder) (3) Load Check Valve Low Pressure B3: B3 Port (To Stabilizer R.H. High Pressure Cylinder) 1.
  • Page 39 BACKHOE BH77, WSM Shrink (1) Stabilizer Cylinder R.H. (4) Spool P Port A3: A3 Port (To Stabilizer R.H. (2) Stabilizer R.H. Control Valve (5) Bridge Passage T Port Cylinder) (3) Load Check Valve Low Pressure B3: B3 Port (From Stabilizer High Pressure R.H.

  • Page 40: Stabilizer L.h

    BACKHOE BH77, WSM (5) Stabilizer L.H. Extend (1) Stabilizer Cylinder L.H. (4) Spool P Port A4: A4 Port (From Stabilizer L.H. (2) Stabilizer L.H. Control Valve (5) Bridge Passage T Port Cylinder) (3) Load Check Valve Low Pressure B4: B4 Port (To Stabilizer L.H. High Pressure Cylinder) 1.
  • Page 41 BACKHOE BH77, WSM Shrink (1) Stabilizer Cylinder L.H. (4) Spool P Port A4: A4 Port (To Stabilizer L.H. (2) Stabilizer L.H. Control Valve (5) Bridge Passage T Port Cylinder) (3) Load Check Valve Low Pressure B4: B4 Port (From Stabilizer L.H. High Pressure Cylinder) 1.

  • Page 42: Boom

    BACKHOE BH77, WSM (6) Boom (1) Boom Cylinder (4) Spool P Port A5: A5 Port (2) Boom Control Valve (5) Bridge Passage T Port (From Boom Cylinder) (3) Load Check Valve Low Pressure B5: B5 Port High Pressure (To Boom Cylinder) 1.
  • Page 43 BACKHOE BH77, WSM Down (1) Boom Cylinder (4) Spool P Port A5: A5 Port (2) Boom Control Valve (5) Bridge Passage T Port (To Boom Cylinder) (3) Load Check Valve Low Pressure B5: B5 Port High Pressure (From Boom Cylinder) 1.

  • Page 44: Boom Swing

    BACKHOE BH77, WSM (7) Boom Swing Right (1) Swing Cylinder L.H. (4) Load Check Valve P Port A6: A6 Port (2) Swing Cylinder R.H. (5) Spool T Port (From Swing Cylinder) (3) Swing Control Valve (6) Bridge Passage Low Pressure B6: B6 Port High Pressure (To Swing Cylinder)
  • Page 45 BACKHOE BH77, WSM Left (1) Swing Cylinder L.H. (4) Load Check Valve P Port A6: A6 Port (2) Swing Cylinder R.H. (5) Spool T Port (To Swing Cylinder) (3) Swing Control Valve (6) Bridge Passage Low Pressure B6: B6 Port High Pressure (From Swing Cylinder) 1.

  • Page 46: Overload Relief Valve

    BACKHOE BH77, WSM [3] OVERLOAD RELIEF VALVE Overload relief valve in this control valve is a combination valve combining a relief operation and anti-cavitation operation.  Relief Operation When the control valve is in the neutral position, both cylinder ports of control valve are blocked by the spool. If an external load is imposed on the cylinder, pressure builds in the circuit.

  • Page 47: Anti-Cavitation Operation

    BACKHOE BH77, WSM When the Actuator Port Pressure is Higher Than the Setting When the cylinder port HP has reached the set pressure of the piston spring (3), the pressurized oil in the spring chamber A opens the pilot poppet (2) and flows through the drain passage into the tank passage.

  • Page 48: Hydraulic Cylinder

    BACKHOE BH77, WSM 3. HYDRAULIC CYLINDER (1) Rod (3) Cylinder Tube (5) Nut (6) Tube End (2) Head (4) Piston Bucket, dipperstick, boom, swing, and stabilizer cylinder consists of cylinder head (2), piston rod (1), cylinder tube (3), piston (4) and other parts as shown in the figure above. They are single-rod double-acting cylinders in which the reciprocating motion of the piston is controlled by hydraulic force applied to both of its ends.
  • Page 49 SERVICING CONTENTS 1. TROUBLESHOOTING.........................1-S1 2. SERVICING SPECIFICATIONS ....................1-S2 3. TIGHTENING TORQUES......................1-S5 4. DISMOUNTING AND MOUNTING ....................1-S7 [1] DISMOUNTING BACKHOE ....................1-S7 [2] MOUNTING BACKHOE TO TRACTOR ................1-S10 [3] DISASSEMBLING BACKHOE.....................1-S12 [4] DISASSEMBLING AND ASSEMBLING SUB FRAME ............1-S17 (1) B3200 and B3300SU Model ..................1-S17 (2) B2630, B3030 and B3000 Model...................1-S18 (3) B2650, B3350, B3350SU Model..................1-S21 (4) L2800, L3400, L3700SU, L3200 and L3800 Model............1-S22...

  • Page 50: Troubleshooting

    BACKHOE BH77, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause and Checking Procedure Solution Page All Functions 1. Quick coupler disconnected Reconnect – Inoperative (Front Loader Is OK) All Functions 1. Insufficient transmission fluid Fill G-8, G-9 Including Front 2. Relief valve spring damaged Replace 1-S26 Loader, Are...

  • Page 51: Servicing Specifications

    BACKHOE BH77, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Relief Valve Hydraulic Main Circuit Setting Pressure B3200 13.3 to 14.3 MPa – (Tractor) 136 to 145 kgf/cm 1960 to 2070 psi B3200, B3300SU 14.4 to 15.2 MPa – (Front Loader) 147 to 154 kgf/cm 2090 to 2200 psi...
  • Page 52 BACKHOE BH77, WSM Item Factory Specification Allowable Limit Boom Support Pin to Bush Clearance 0.100 to 0.180 mm 1.0 mm 0.00394 to 0.00708 in. 0.039 in. • Boom Support Pin O.D. 29.82 to 29.85 mm – 1.174 to 1.175 in. •...
  • Page 53 BACKHOE BH77, WSM Item Factory Specification Allowable Limit Thrust Washer Thickness 2.45 to 2.82 mm 1.8 mm 0.0965 to 0.111 in. 0.071 in. Piston Rod Bend – 0.25 mm 0.0098 in. 9Y1210544BHS0002US0 1-S4 KiSC issued 08, 2014 A...

  • Page 54: Tightening Torques

    BACKHOE BH77, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: See page G-4.) [All Model] Item N·m kgf·m lbf·ft Seat support mounting screw 78 to 90 7.9 to 9.2 58 to 66...
  • Page 55 BACKHOE BH77, WSM [L2800, L3400, L3700SU, L3200, L3800] Item N·m kgf·m lbf·ft Rear wheel mounting screw and nut 22.0 Coupler joint mounting screw 24 to 27 2.4 to 2.8 18 to 20 Connecting plate mounting screw and nut M12 78 to 90 7.9 to 9.2 58 to 66 Frame bracket mounting screw M14...

  • Page 56: Dismounting And Mounting

    BACKHOE BH77, WSM 4. DISMOUNTING AND MOUNTING [1] DISMOUNTING BACKHOE CAUTION • When starting the engine, always sit on the tractor operator's seat. • When getting off the tractor, make sure that PTO lever is off and range gear shift lever is in neutral. Then set the parking brake.
  • Page 57 BACKHOE BH77, WSM Mounting Pin 1. Raise the rear wheels slightly with the boom and remove the mounting pins (1). 2. Slowly raise the boom to disengage the backhoe from the tractor. 3. Raise the backhoe by operating the stabilizers to the lowering direction until the mount bars (3) hit to the guide stopper (2) on the support hooks (4).

  • Page 58: Hydraulic Hoses

    BACKHOE BH77, WSM Hydraulic Hoses 1. Slowly release all hydraulic pressure by moving the backhoe hydraulic control levers in all directions. 2. Disconnect the inlet and outlet hoses from the tractor. 3. Connect tractor outlet hose to the coupler of return hose. IMPORTANT •...

  • Page 59: Mounting Backhoe To Tractor

    BACKHOE BH77, WSM Separation 1. Start the engine. Then drive the tractor / loader slowly from the backhoe. 2. Shut off the engine and remove the key from the tractor. Set the parking brake. NOTE • The entire three point hitch can now be reinstalled on the tractor for use with other rear mount implements.
  • Page 60 BACKHOE BH77, WSM Mounting Pin and Mounting Backhoe WARNING • Do not move the joystick control lever to the swing position. 1. Start the engine. 2. Stand beside the rear wheel. Move the boom to fully raising position and raise the backhoe by operating the stabilizers. Raise the backhoe until the mount bar on the backhoe main frame are slightly higher than the tractor main frame support hooks.

  • Page 61: Disassembling Backhoe

    BACKHOE BH77, WSM [3] DISASSEMBLING BACKHOE IMPORTANT • When reassembling the pins, bushes and inner rings, apply slight coat of grease to them. • When tightening the hydraulic hoses, refer to "HYDRAULIC FITTINGS" in GENERAL section. 9Y1210544BHS0012US0 Cab Spacer [CAB Model] 1.
  • Page 62 BACKHOE BH77, WSM Dipperstick and Bucket Cylinder 1. Remove the pins (5) and remove the bucket link (6) and guide link (7). 2. Disconnect the hydraulic hoses (2) and remove the bucket cylinder (4). 3. Remove the pins (1), (9) and remove the dipperstick (8). (When reassembling) •...
  • Page 63 BACKHOE BH77, WSM Hydraulic Hoses 1. Disconnect the hydraulic hoses from the control valve and remove the hydraulic hoses. (When reassembling) • Connect the hydraulic hoses to their original positions and be sure to connect the hose angle as indicated table below. Port Angle of Bent Tube A1, B1...
  • Page 64 BACKHOE BH77, WSM Swing Frame 1. Disconnect the swing cylinder rods from swing frame (2). 2. Remove the swing frame (2) from main frame. (When reassembling) • Lock the locking nut until setting bolt can still be rotated. • Reinstall the thrust washers (5) to their original positions. (1) Pin (40 ×...

  • Page 65: Hydraulic Hose

    BACKHOE BH77, WSM Control Valve 1. Remove the control valve assembly (1). (1) Control Valve Assembly 9Y1210544BHS0022US0 Swing Cylinder and Hydraulic Hoses 1. Remove the swing cylinder support (1). 2. Disconnect the hydraulic hoses (2). 3. Remove the swing cylinder R.H. (3) and swing cylinder L.H. (4) from the backhoe main frame (5).

  • Page 66: Disassembling And Assembling Sub Frame

    BACKHOE BH77, WSM Backhoe Main Frame 1. Hoist the backhoe main frame (1) and remove the pins (2) from tractor sub frame. 2. Separate the backhoe main frame (1) from the tractor sub frame (3). (1) Backhoe Main Frame (3) Tractor Sub Frame (2) Pin 9Y1210544BHS0025US0 [4] DISASSEMBLING AND ASSEMBLING SUB FRAME...

  • Page 67: B2630, B3030 And B3000 Model

    BACKHOE BH77, WSM Connecting Plate and Sub Frame 1. Lift the rear side of sub frame (1) by hoist and place hydraulic jack as show in the figure. 2. Remove the connecting plate (4). 3. Remove the sub frame mounting screws and nuts. 4.
  • Page 68 BACKHOE BH77, WSM Connecting Plate 1. Disconnect the coupler joint (1). 2. Remove the connecting plate (2). (When reassembling) 24 to 27 N·m Coupler joint mounting 2.4 to 2.8 kgf·m screw 18 to 20 lbf·ft Tightening torque 196 to 225 N·m Connecting plate mounting 20.0 to 23.0 kgf·m screw and nut M16...
  • Page 69 BACKHOE BH77, WSM Sub Frame and Frame Bracket 1. Hoist the rear side frame (1) by jack and place hydraulic jack as shown in the figure. 2. Remove the sub frame mounting screws and nuts. 3. Slowly lower the sub frame by jack and hoist to separate the sub frame (1).

  • Page 70: B2650, B3350, B3350Su Model

    BACKHOE BH77, WSM (3) B2650, B3350, B3350SU Model Rear Wheel 1. Place disassembling stand under the tractor frame, and support it with a jack. 2. Remove the rear wheels (1). 3. After removing the rear wheels, support it on both sides of rear axle by stand.

  • Page 71: L2800, L3400, L3700Su, L3200 And L3800 Model

    BACKHOE BH77, WSM (4) L2800, L3400, L3700SU, L3200 and L3800 Model Rear Wheel 1. Place disassembling stand under the tractor frame, and support it with a jack. 2. Remove the rear wheels. 3. After removing the wheels, support it on both sides of rear axle by stand.

  • Page 72: L3240(-3), L3540(-3) And L3560 Model

    BACKHOE BH77, WSM Sub Frame 1. Hoist the rear side of sub frame (1) by jack and place hydraulic jack as shown in the figure. 2. Remove the sub frame mounting screws and nuts. 3. Slowly lower the sub frame by jack and hoist to separate the sub frame (1).
  • Page 73 BACKHOE BH77, WSM Connecting Plate and Rear Bracket 1. Disconnect the coupler joint (1). 2. Remove the connecting plate (2). 3. Remove the frame support (4). 4. Remove the rear bracket (3). NOTE • On the L3240(-3) and L3540(-3), remove the rear bracket, then attach the collar (5).
  • Page 74 BACKHOE BH77, WSM Sub Frame 1. Hoist the rear side of sub frame (1) by jack and place hydraulic jack as shown in the figure. 2. Remove the sub frame mounting bolt and nut. 3. Slowly lower the sub frame by jack and hoist to separate the sub frame (1).

  • Page 75: Checking, Disassembling And Servicing

    BACKHOE BH77, WSM 5. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Control Valve Relief Valve Setting Pressure (for Tractor and Front Loader) 1. Remove the control valve cover. 2. Disconnect the hydraulic hose from A1 port (1) of the control valve.
  • Page 76 BACKHOE BH77, WSM (Continued) 13.3 to 14.3 MPa B3200 136 to 145 kgf/cm (Tractor) 1960 to 2070 psi B3200 14.4 to 15.2 MPa B3300SU 147 to 154 kgf/cm (Front 2090 to 2200 psi Loader) B2630 B3030 15.8 to 16.5 MPa B3000 161 to 169 kgf/cm (Front...

  • Page 77: Boom, Dipperstick, Bucket, Swing And Stabilizer Cylinder

    BACKHOE BH77, WSM (2) Boom, Dipperstick, Bucket, Swing and Stabilizer Cylinder Cylinder 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 78 BACKHOE BH77, WSM Cylinder Head, Piston and Nut 1. Secure the rod end in a vise. 2. Unscrew 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 79 BACKHOE BH77, WSM Piston Seal and O-ring 1. Remove the piston seal (2) and O-ring (3) from the piston (1). IMPORTANT • When installing the O-ring (3) and piston seal (2) to the piston (1), use the slide jig and correcting jig as shown in the figure.
  • Page 80 BACKHOE BH77, WSM Installing O-ring and Piston Seal 1. Place the slide jig (2) on the piston (4). 2. Install the O-ring (3) on the piston using the slide jig. 3. Install the piston seal (1) over the O-ring using the slide jig. 4.
  • Page 81 BACKHOE BH77, WSM (Continued) Clearance Factory specification Allowable limit Swing frame fulcrum pin 0.200 to 0.269 mm 1.0 mm and bush 0.00788 to 0.0105 in. 0.039 in. Swing cylinder trunnion 0.100 to 0.225 mm 1.0 mm boss and support bush 0.00394 to 0.00885 in.

  • Page 82: Disassembling And Assembling

    BACKHOE BH77, WSM Thrust Washer Wear 1. Measure the thickness of thrust washer with an outside micrometer. 2. If the wear exceeds the allowable limit, replace it. NOTE • Visually inspect the thrust washer for signs of scoring or damage not only on the thrust washer but also on the main frame and swing frame contact surface.
  • Page 83 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 2014. 08, S, EI, EI, engusa Code No.9Y111-05443 2010.

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