Kubota BACKHOE BH65 Workshop Manual
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Kubota BACKHOE BH65 Workshop Manual

Kubota BACKHOE BH65 Workshop Manual

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WORKSHOP MANUAL
BACKHOE
BH65
KiSC issued 07, 2010 A

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Summary of Contents for Kubota BACKHOE BH65

  • Page 1 WORKSHOP MANUAL BACKHOE BH65 KiSC issued 07, 2010 A...
  • Page 2 TO THE READER This Workshop Manual has been prepared to provide servicing personnel with information on the mechanism, service and maintenance of KUBOTA Backhoe BH65. 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

    SAFETY INSTRUCTIONS BH65, WSM 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. It is essential that you read the instructions and safety regulations before you attempt to repair or use this unit.
  • Page 4 SAFETY INSTRUCTIONS BH65, WSM SAFETY STARTING • Do not start the engine by shorting across starter terminals or bypassing the safety start switch. • Do not alter or remove any part of machine safety system. • Before starting the engine, make sure that all shift levers are in neutral positions or in disengaged positions.
  • Page 5 SAFETY INSTRUCTIONS BH65, WSM 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 SAFETY INSTRUCTIONS BH65, WSM 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 07, 2010 A...

  • Page 7: Safety Decals

    SAFETY INSTRUCTIONS BH65, WSM 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. KiSC issued 07, 2010 A...
  • Page 8 SAFETY INSTRUCTIONS BH65, WSM KiSC issued 07, 2010 A...
  • Page 9 TERMINOLOGY BH65, WSM TERMINOLOGY (1) Seat (11) Main Frame (2) Cylinder, Dipperstick (12) Stabilizer (3) Cylinder, Boom (13) Stabilizer Pad (4) Dipperstick (14) Cylinder, Stabilizer (5) Cylinder, Bucket (15) Cylinder, Swing (6) Link, Bucket (16) Swing Lock Pin (7) Backhoe Bucket (17) Joystick Control Lever (8) Bucket Teeth (18) Stabilizer Control Lever...

  • Page 10: Specifications

    Angle of Departure per SAE J1234 19.0 deg. Leveling Angle 11.8 deg. Swing Arc 150 deg. — 60 deg. NOTE: The specifications are taken with KUBOTA B2320, B2620, B2920 tractor. (Tire size : Front 23 × 8.5-14, Rear 12-16.5) W1028417 KiSC issued 07, 2010 A...

  • Page 11: Hydraulic Cylinders

    SPECIFICATIONS BH65, WSM Digging Force (Per SAE J49) With bucket cylinder 11500 N (2585 lbf) With dipperstick cylinder 7500 N (1687 lbf) W1027852 Cycle Time (Seconds) Boom cylinder, extend Boom cylinder, retract Swing cylinder, from 70 ° to center Dipperstick cylinder, extend Dipperstick cylinder, retract Bucket cylinder, extend Bucket cylinder, retract...
  • Page 12 SPECIFICATIONS BH65, WSM Lift Capacity (Per SAE J31) Lift capacites shown are 87 % of maximum lift force, according to SAE definition. 235 kg (518 lbs) 246 kg (542 lbs) 243 kg (536 lbs) 238 kg (525 lbs) 237 kg (523 lbs) 253 kg (558 lbs) W1029646 KiSC issued 07, 2010 A...
  • Page 13 GENERAL KiSC issued 07, 2010 A...

  • Page 14: 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] HYDRAULIC FITTINGS ................G-5 5. MAINTENANCE CHECK LIST ............... G-6 6.

  • Page 15: Backhoe Identification

    G GENERAL BH65, WSM 1. BACKHOE IDENTIFICATION When contacting your local KUBOTA distributor, always specify backhoe serial number. (1) Serial Number W1010477 KiSC issued 07, 2010 A...

  • Page 16: 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 17: 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 07, 2010 A...

  • Page 18: Tightening Torques

    G GENERAL BH65, WSM 4. TIGHTENING TORQUES Screws, bolts, nuts and hydraulic fittings that tightening torques are not specified in this Workshop Manual should be tightened according to tables below. [1] GENERAL USE SCREWS, BOLTS AND NUTS Indication on top of No-grade or 4T bolt SCr435,...

  • Page 19: Hydraulic Fittings

    G GENERAL BH65, WSM [2] HYDRAULIC FITTINGS Adaptors, Elbows and Others Tightening torque Item Thread size N·m kgf·m lbf·ft 9/16 37 to 44 3.8 to 4.5 27 to 33 Adjustable elbow, Adaptor 48 to 54 4.9 to 5.5 35 to 40 9/16 22 to 25 2.3 to 2.6...

  • Page 20: Maintenance Check List

    G GENERAL BH65, 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 Daily (Each use) •...

  • Page 21: Check And Maintenance

    Check that the oil level is between the two notches. 3. If the level is too low, replenish new 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”.

  • Page 22: Check Point Of Every 10 Hours

    G GENERAL BH65, WSM [2] CHECK POINT OF EVERY 10 HOURS Greasing 1. Inject grease all grease nipples with a hand grease gun. W1015410 [3] CHECK POINT OF EVERY 50 HOURS Checking Sub Frame Bolt Torque CAUTION • Never operate backhoe and front loader with a loose sub frame.

  • Page 23: Special Tools

    G GENERAL BH65, 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) (9) Adaptor F (PF1/2) (07916-62601)
  • Page 24 BACKHOE KiSC issued 07, 2010 A...
  • Page 25 MECHANISM CONTENTS 1. HYDRAULIC SYSTEM..................M-1 [1] HYDRAULIC CIRCUIT................M-1 [2] CONTROL VALVE ..................M-2 (1) Structure ....................M-2 (2) Operation ..................... M-3 (3) Overload Relief Valve ................ M-16 [3] HYDRAULIC CYLINDER ................ M-18 KiSC issued 07, 2010 A...

  • Page 26: Hydraulic System

    BACKHOE BH65, WSM 1. HYDRAULIC SYSTEM [1] HYDRAULIC CIRCUIT (1) Bucket Cylinder (4) Stabilizer Cylinder, L.H. (6) Swing Cylinder P : Pump Port (2) Dipperstick Cylinder (5) Boom Cylinder (7) Backhoe Control Valve T : Tank Port (3) Stabilizer Cylinder, R.H. KiSC issued 07, 2010 A...

  • Page 27: Control Valve

    BACKHOE BH65, WSM [2] CONTROL VALVE (1) Structure (1) Inlet Section (8) Outlet Section A1 : A1 Port B1 : B1 Port (2) Bucket Control Valve P : Pump Port A2 : A2 Port B2 : B2 Port (3) Dipperstick Control Valve T : Tank Port A3 : A3 Port B3 : B3 Port...

  • Page 28: Operation

    BACKHOE BH65, WSM (2) Operation Neutral (1) Inlet Section (8) Outlet Section P : Pump Port B1 : B1 Port (2) Bucket Control Valve (9) Load Check Valve T : Tank Port B2 : B2 Port (3) Dipperstick Control Valve (10) Spool A1 : A1 Port B3 : B3 Port...
  • Page 29 BACKHOE BH65, WSM Bucket (Roll-back) (1) Bucket Cylinder (4) Spool P : P Port A1 : A1 Port (2) Bucket Control Valve (5) Bridge Passage T : T Port (From Bucket Cylinder) (3) Load Check Valve a : Low Pressure B1 : B1 Port b : High Pressure (To Bucket Cylinder)
  • Page 30 BACKHOE BH65, WSM Bucket (Dump) (1) Bucket Cylinder (4) Spool P : P Port A1 : A1 Port (2) Bucket Control Valve (5) Bridge Passage T : T Port (To Bucket Cylinder) (3) Load Check Valve a : Low Pressure B1 : B1 Port b : High Pressure (From Bucket Cylinder)
  • Page 31 BACKHOE BH65, WSM Dipperstick (Crowd) (1) Dipperstick Cylinder (4) Spool P : P Port A2 : A2 Port (2) Dipperstick Control Valve (5) Bridge Passage T : T Port (From Dipperstick Cylinder) (3) Load Check Valve a : Low Pressure B2 : B2 Port b : High Pressure (To Dipperstick Cylinder)
  • Page 32 BACKHOE BH65, WSM Dipperstick (Extend) (1) Dipperstick Cylinder (4) Spool P : P Port A2 : A2 Port (2) Dipperstick Control Valve (5) Bridge Passage T : T Port (To Dipperstick Cylinder) (3) Load Check Valve a : Low Pressure B2 : B2 Port b : High Pressure (From Dipperstick Cylinder)
  • Page 33 BACKHOE BH65, WSM Stabilizer, R.H. (Extend) (1) Stabilizer Cylinder, R.H. (4) Spool P : P Port A3 : A3 Port (To Stabilizer (2) Stabilizer Control Valve, R.H. (5) Bridge Passage T : T Port Cylinder, R.H.) (3) Load Check Valve a : Low Pressure B3 : B3 Port b : High Pressure...
  • Page 34 BACKHOE BH65, WSM Stabilizer, R.H. (Shrink) (1) Stabilizer Cylinder, R.H. (4) Spool P : P Port A3 : A3 Port (2) Stabilizer Control Valve, R.H. (5) Bridge Passage T : T Port (From Stabilizer Cylinder, (3) Load Check Valve a : Low Pressure R.H.) b : High Pressure B3 : B3 Port (To Stabilizer...
  • Page 35 BACKHOE BH65, WSM Stabilizer, L.H. (Extend) (1) Stabilizer Cylinder, L.H. (4) Spool P : P Port A4 : A4 Port (To Stabilizer (2) Stabilizer Control Valve, L.H. (5) Bridge Passage T : T Port Cylinder, L.H.) (3) Load Check Valve a : Low Pressure B4 : B4 Port b : High Pressure...
  • Page 36 BACKHOE BH65, WSM Stabilizer, L.H. (Shrink) (1) Stabilizer Cylinder, L.H. (4) Spool P : P Port A4 : A4 Port (2) Stabilizer Control Valve, L.H. (5) Bridge Passage T : T Port (From Stabilizer Cylinder, (3) Load Check Valve a : Low Pressure L.H.) b : High Pressure B4 : B4 Port (To Stabilizer...
  • Page 37 BACKHOE BH65, WSM Boom (Up) (1) Boom Cylinder (4) Spool P : P Port A5 : A5 Port (2) Boom Control Valve (5) Bridge Passage T : T Port (From Boom Cylinder) (3) Load Check Valve a : Low Pressure B5 : B5 Port b : High Pressure (To Boom Cylinder)
  • Page 38 BACKHOE BH65, WSM Boom (Down) (1) Boom Cylinder (4) Spool P : P Port A5 : A5 Port (2) Boom Control Valve (5) Bridge Passage T : T Port (To Boom Cylinder) (3) Load Check Valve a : Low Pressure B5 : B5 Port b : High Pressure (From Boom Cylinder)
  • Page 39 BACKHOE BH65, WSM Boom Swing (Right) (1) Swing Cylinder (4) Spool P : P Port A6 : A6 Port (2) Swing Control Valve (5) Bridge Passage T : T Port (From Swing Cylinder) (3) Load Check Valve a : Low Pressure B6 : B6 Port b : High Pressure (To Swing Cylinder)
  • Page 40 BACKHOE BH65, WSM Boom Swing (Left) (1) Swing Cylinder (4) Spool P : P Port A6 : A6 Port (2) Swing Control Valve (5) Bridge Passage T : T Port (To Swing Cylinder) (3) Load Check Valve a : Low Pressure B6 : B6 Port b : High Pressure (From Swing Cylinder)

  • Page 41: Overload Relief Valve

    BACKHOE BH65, 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 42 BACKHOE BH65, 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 (5), the pressure oil in the spring chamber A opens the pilot poppet (4) and flows through the drain passage into the tank passage.

  • Page 43: Hydraulic Cylinder

    BACKHOE BH65, 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 44 SERVICING CONTENTS 1. TROUBLESHOOTING ..................S-1 2. SERVICING SPECIFICATIONS ..............S-2 3. DISMOUNTING AND MOUNTING..............S-5 [1] DISMOUNTING THE BACKHOE..............S-5 [2] MOUNTING THE BACKHOE TO TRACTOR .........S-7 4. CHECKING, DISASSEMBLING AND SERVICING........S-9 [1] CHECK AND ADJUSTING................S-9 (1) Control Valve ..................S-9 [2] DISASSEMBLING THE BACKHOE ............S-10 (1) Backhoe ....................S-10 (2) Control Valve ..................S-15 (3) Boom, Dipperstick, Bucket, Swing and Stabilizer Cylinder ....S-16...

  • Page 45: Troubleshooting

    BACKHOE BH65, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page All Functions Quick coupler disconnected Reconnect – Inoperative (Front Loader Is OK) All Functions Insufficient transmission fluid Replenish Including Front Relief valve spring damaged Replace Loader, Are Hydraulic pump malfunctioning Repair or replace –...

  • Page 46: Servicing Specifications

    BACKHOE BH65, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Relief Valve Setting Pressure 13.7 to 14.4 MPa – Condition : Engine 140 to 146 kgf/cm Speed ; 1990 to 2080 psi Approx.2800 min (rpm) Oil Temperature ; 50 °C, 122 °F Dipperstick Fulcrum Pin and Bushing Clearance 0.15 to 0.19 mm...
  • Page 47 BACKHOE BH65, WSM Item Factory Specification Allowable Limit Boom Cylinder Rod Pin and Bushing Clearance 0.139 to 0.281 mm 1.0 mm 0.00548 to 0.0110 in. 0.039 in. O.D. 29.97 to 30.00 mm – 1.180 to 1.181 in. I.D. 30.139 to 30.251 mm –...
  • Page 48 BACKHOE BH65, 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.) Item N·m kgf·m lbf·ft Adaptor elbow (G 1/4) 25 to 29 2.6 to 2.9 19 to 21 Elbow (G 3/8)

  • Page 49: Dismounting And Mounting

    BACKHOE BH65, WSM 4. DISMOUNTING AND MOUNTING [1] DISMOUNTING THE BACKHOE CAUTION • When starting the engine, always sit in the 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 50: Hydraulic Hoses

    BACKHOE BH65, WSM Mounting Pin 1. Raise the rear wheels slightly with the boom and remove the mounting pins (1). 2. Put the mounting pins (1) in the holes on the step of the backhoe. 3. Slowly raise the boom to disengage the backhoe from the tractor. 4.

  • Page 51: Mounting The Backhoe To Tractor

    BACKHOE BH65, 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 52 BACKHOE BH65, WSM Mounting Pin and Mounting Backhoe IMPORTANT • Make sure both hoses are firmly connected before starting the engine. 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 until the mount bar on the backhoe main frame are slightly higher than the tractor main frame support hooks.

  • Page 53: Checking, Disassembling And Servicing

    BACKHOE BH65, WSM 5. CHECKING, DISASSEMBLING AND SERVICING [1] CHECK AND ADJUSTING (1) Control Valve Relief Valve Setting Pressure 1. Remove the control cover. 2. Disconnect the hydraulic hose from A1 port (1) of the control valve. 3. Install the adaptor A between control valve and hydraulic hose. 4.
  • Page 54 BACKHOE BH65, WSM [2] DISASSEMBLING THE BACKHOE (1) Backhoe IMPORTANT • When reassembling the pins, bushings and inner rings, apply slight coat of grease to them. • When tightening the hydraulic hoses, refer to “HYDRAULIC HOSES FITTING AND FLARE PIPES” (Page G-4.) Bucket 1.
  • Page 55 BACKHOE BH65, WSM Dipperstick Cylinder, Boom, Boom Cylinder and Hoses 1. Disconnect the hydraulic hoses and remove the dipperstick cylinder (4). 2. Remove the pins (1), (5) and remove the boom cylinder (2). 3. Remove the pin (7) and remove the boom (6). 4.
  • Page 56 BACKHOE BH65, WSM Swing Frame 1. Disconnect the swing cylinder rod (5) from swing frame (4). 2. Remove the swing frame (4) from main frame (1). (When reassembling) • Lock the locking nuts to setting bolts at position where the setting bolt may still be rotated.
  • Page 57 BACKHOE BH65, WSM Lever Support and Valve 1. Remove the cover. 2. Disconnect the control lever rods (3) of valve side. 3. Remove the lever support (2) with control valve levers (1). 4. Disconnect the hydraulic hoses. 5. Remove the control valve (4). (When reassembling) •...
  • Page 58 BACKHOE BH65, WSM Backhoe Main Frame and Hydraulic Hose 1. Hoist the backhoe main frame (1) and remove the mount pin (2). 2. Remove the tractor outlet hose (3) from backhoe side and return hose (4) from the tractor inlet tube (5). 3.

  • Page 59: Control Valve

    BACKHOE BH65, WSM (2) Control Valve Adapter and Elbow 1. Remove the adaptors and elbows from the control valve (4). (When reassembling) • Use care not to damage the O-ring. 25 to 29 N·m Adaptor elbow (G 1/4) 2.6 to 2.9 kgf·m 19 to 21 lbf·ft Tightening torque 49 to 54 N·m...

  • Page 60: Boom, Dipperstick, Bucket, Swing And Stabilizer Cylinder

    BACKHOE BH65, WSM (3) 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 61: Sub Frame

    BACKHOE BH65, WSM Cylinder Adaptor Angle • Connect the cylinder adaptor at their original positions and be sure to connect the adaptor angle as indicated table below. Cylinder Rod Side Bottom Side ±1 ±1 Swing (deg.) (deg.) ±1 ±1 Boom ±1 ±1 Dipperstick...
  • Page 62 BACKHOE BH65, WSM Sub Frame 1. Lift the sub frame (1) by jack and place hydraulic jack as shown 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 63: Servicing

    BACKHOE BH65, WSM [3] SERVICING (1) Bush, Pin and Cylinder 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 64 BACKHOE BH65, 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 (2). 3. Install the piston seal (1) over the O-ring using the slide jig (2). 4.
  • Page 65 BACKHOE BH65, WSM Clearance between Pin and Bushing 1. Measure the pins O.D. with an outside micrometer. 2. Measure the bushings I.D. with a cylinder gauge. 3. If the clearance exceeds the allowable limit, replace pin or bushing. S-21 KiSC issued 07, 2010 A...
  • Page 66 BACKHOE BH65, WSM Clearance between Pin and Bushing Clearance Factory spec. Allowable limit Dipperstick fulcrum pin 0.15 to 0.19 mm 1.0 mm and bushing 0.0059 to 0.0074 in. 0.039 in. Dipperstick cylinder rod 0.18 to 0.32 mm 1.0 mm pin and bushing 0.071 to 0.12 in.
  • Page 67 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 Printed in Japan 2010. 06, S, EI, EI, e Code No.9Y111-01650 KUBOTA Corporation 2008.

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