Kubota KX71-3 Workshop Manual
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Kubota KX71-3 Workshop Manual

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WORKSHOP MANUAL
KUBOTA EXCAVATOR
KX61-3, KX71-3
Mechanism Chapter
Code No.97899-60810
Code No.97899-61040

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could you please provide me with part numbers for the following KX71-3 excavator parts. 2Xboom seals, hydraulic filters and bucket tooth pin
April 15, 2025

Kubota KX71-3

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Summary of Contents for Kubota KX71-3

  • Page 1 WORKSHOP MANUAL KUBOTA EXCAVATOR KX61-3, KX71-3 Mechanism Chapter Code No.97899-60810 Code No.97899-61040...

  • Page 2: Inch

    Record of Revisions Symbol Date Main Revised Points & Corrective Measures Person-in-charge KX61-3 EU and KX71-3 EU are for EU(European) - version. KX71-3 PP is for KTC, KCL and KTA - version.
  • Page 3 CONTENTS I General II Machine Body III Engine IV Hydraulic System V Electrical system M-I-1...
  • Page 4 Sales feature ......... M-I-3 b. Difference between KX61-3 and KX71-3....M-I-3 c.

  • Page 5: A. Sales Feature

    Much easier access into cabin Cabin width expansion Operativity Straight travel adoption Smoother operation Safety Engine safety start Travel lock system ROPS, FOPS standard equipment b. Difference between KX61-3 and KX71-3 Differentiation KX61-3 KX71-3 Remark No1. Engine V1505 (24.8 PS) V1505 (27.5PS) No2.
  • Page 6 Quick chart for selling points : KX61-3, KX71-3 Digital panel High speed travel switch Short stroke operating with new navigation system on the dozer lever lever and wrist rest Best matching of variable displacement hydraulic pump and Kubota new diesel engine V1505, 24.8HP 2100rpm (KX61-3)

  • Page 7: D. Comparison To Competitors;Eu - Version

    d. Comparison to competitors;EU - version...

  • Page 8: E. Compornents Compatibility

    KX61-3, KX71-3 WSM-M General e. Compornents compatibility Parent 100% compatible high compatible low compatible Original design M-I-6...

  • Page 9: F. Machine Specifications

    KX61-3, KX71-3 WSM-M General f. Machine specifications Unit KX61-3 EU KX71-3 EU KX71-3 PP Engine Type Vertical, water-cooled 4 cycle, 4 cylinders diesel Model V1505-E2-BH-9-EU V1505-E2-BH-10-EU V1505-E2-BH-10 ← Output power (ISO 3406m Gross) 18.3 kW/2100rpm 20.6 kW/2300rpm 24.9 PS/2100rpm 28.0 PS/2300rpm (SAE-J1349) ←...
  • Page 10 KX61-3, KX71-3 WSM-M General g. Machine weight (lbs) Track KX61-3 EU KX71-3 EU KX71-3 PP 2530 2720 — (5566) (5984) Rubber 2540 2730 2780 Long (5588) (6006) (6116) Canopy 2625 2815 — (5775) (6193) Iron 2630 2825 2875 Long (5786)

  • Page 11: Table Of Contents

    Quality specifications Machine specifications : Service port, Wrist rest, STD and Long arm, FM-cab or canopy, KBM & KBT bucket KX61-3 EU KX71-3 EU KX71-3 PP Specificatios Items Unit Remarks Std value Allowable range Std value Allowable range Std value Allowable range Main Specs.

  • Page 12: Table Of Contents

    KX61-3 EU KX71-3 EU KX71-3 PP Specificatios Items Unit Remarks Std value Allowable range Std value Allowable range Std value Allowable range ← ← mm 1160.0 1137.0 to 1183.0 1200.0 1176.0 to 1224.0 Rear end min. turning ← ← radius inch 45.7...

  • Page 13: Table Of Contents

    KX61-3 EU KX71-3 EU KX71-3 PP Specificatios Items Unit Remarks Std value Allowable range Std value Allowable range Std value Allowable range mm 2490.0 2440.0 to 2540.0 2680.0 2626.0 to 2734.0 2970.0 2911.0 to 3029.0 inch 98.0 96.1 to 100.0 105.5...

  • Page 14: Table Of Contents

    KX61-3 EU KX71-3 EU KX71-3 PP Specificatios Items Unit Remarks Std value Allowable range Std value Allowable range Std value Allowable range 350.0 300.0 to 400.0 370.0 320.0 to 420.0 340.0 290.0 to 390.0 Max. lift above GL inch 13.8 11.8 to 15.7...

  • Page 15: Table Of Contents

    KX61-3 EU KX71-3 EU KX71-3 PP Specificatios Items Unit Remarks Std value Allowable range Std value Allowable range Std value Allowable range kgf 2060.4 1856.4 < 2274.6 2050.2 < 2254.2 2029.8 < Oil temp. 50 degree centi., travel 20.2 18.2 <...

  • Page 16: Table Of Contents

    KX61-3 EU KX71-3 EU KX71-3 PP Specificatios Items Unit Remarks Std value Allowable range Std value Allowable range Std value Allowable range 2880.0 2754.0 < Power hole 28.4 27.0 < 6349.3 6071.5 < ← ← kgf 1723.8 1642.2 < 2130.0 2019.6 <...
  • Page 17 KX61-3 EU KX71-3 EU KX71-3 PP Specificatios Items Unit Remarks Std value Allowable range Std value Allowable range Std value Allowable range Swivel, swing performance kgf•m 438.6 377.4 < 489.6 418.2 < 420.0 357.0 < 1 Swivel torque kN.m 3.7 <...
  • Page 18 KX61-3 EU KX71-3 EU KX71-3 PP Specificatios Items Unit Remarks Std value Allowable range Std value Allowable range Std value Allowable range 175.0 170.3 to 180.5 210.0 205.0 to 215.2 210.0 205.0 to 215.2 kgf/cm 17.2 16.7 to 17.7 20.6 20.1 to 21.1...
  • Page 19 KX61-3 EU KX71-3 EU KX71-3 PP Specificatios Items Unit Remarks Std value Allowable range Std value Allowable range Std value Allowable range ← ← 0.5 to 1.5 1.43 0.9 to 1.9 ← ← extend 10.0 5.0 to 15.0 14.0 9.0 to 19.0 ←...
  • Page 20 KX61-3 EU KX71-3 EU KX71-3 PP Specificatios Items Unit Remarks Std value Allowable range Std value Allowable range Std value Allowable range ← ← ← ← 3.4 to 6.4 ← ← ← ← 48.0 33.0 to 63.0 ← ← ←...
  • Page 21 KX61-3 EU KX71-3 EU KX71-3 PP Specificatios Items Unit Remarks Std value Allowable range Std value Allowable range Std value Allowable range ← ← ← ← 72.0 62.0 to 82.0 crowd ← ← ← ← inch 2.4 to 3.2 Bucket lever stroke ←...
  • Page 22 KX61-3, KX71-3 WSM-M General M-I-20...
  • Page 23 KX61-3, KX71-3 WSM-M Machine Body II.Machine Body..... M-II-2 a. Main component ........M-II-2 b.
  • Page 24 KX61-3, KX71-3 WSM-M Machine Body .Machine Body a. Main component 1. Pump coupling 1-1 KX71-3 PP - version 1-2 KX61-3, KX-71-3 EU- version M-II-2...
  • Page 25 KX61-3, KX71-3 WSM-M Machine Body 2. Bucket : Kubota standard bucket 2-1 KX-61-3 85.5 (503.5) 33.5 6.3a THE SHAFT OF Ø29.95 MUST PASS THROUGH THIS HOLE SMOOTHLY. THE SHAFT OF Ø29.95 MUST PASS THROUGH THIS HOLE SMOOTHLY. 6.3a DRILL 13.5 12.5...
  • Page 26 KX61-3, KX71-3 WSM-M Machine Body 2-3 Bucket dimensions Unit KX61-3 KX71-3 Remarks 17.6 18.9 18.6 19.8 φ76.3 × t9.5 φ76.1 × t10 φ3.00 × t0.37 φ3.00 × t0.39 ← 7.24 4.33 5.28 ← 0.47 ← 0.98 2.20 2.64 φ54 φ64 φ2.13...
  • Page 27 KX61-3, KX71-3 WSM-M Machine Body 3. Bucket installation relevant dimensions 3-1 Boom, arm, bucket link Unit : mm (inch) KX61-3 KX71-3 Remarks 60 (2.36) 59.8 (2.35) φ20 ← 50.5 (1.99) 52.9 (2.08) 60 (2.36) 60 (2.36) 32.3 (1.27) 14.5 (0.57) 5.0 (0.20)
  • Page 28 KX61-3, KX71-3 WSM-M Machine Body 3-2 Bushing (13) (12) (10) (11) [Unit:mm] M-II-6...
  • Page 29 KX61-3, KX71-3 WSM-M Machine Body 4. Swing bracket (12) (13) (2)~(8) (11) (10) (10) (11) (1) Swing bracket (2) ~ (8) Bushing (9) Side of the bush ( ) should flash the face. (10) Bush press-fitting direction (11) Check the bushing direction.
  • Page 30 KX61-3, KX71-3 WSM-M Machine Body 5. Swivel bearing (1) Seal B (2) S-mark (3) Seal A (4) R 1/8, for grease nipple Number of teeth = 80 CLEARANCE (AXIAL) : 0.05~0.12mm (0.002~0.005 in.) P.C.D. = φ 440 M-II-8...

  • Page 31: Rubber

    KX61-3, KX71-3 WSM-M Machine Body 6. Idler and tension spring : Rubber track and iron track 6-1 Structure (1) Support 1 (5) Floating seal (9) Wire (13) Bolt (2) Support 2 (6) Bushing (10) Plug, R 1/8 (14) Spring (3) shaft...
  • Page 32 KX61-3, KX71-3 WSM-M Machine Body 7. Track roller Lub oil : Engine oil SAE #30 CD grade 80 cc Plug : Apply screw lock agent #503 and tightening torque 1.0 kg · Floating seal (1) O-ring, NBR A283 (2) Seal ring...
  • Page 33 KX61-3, KX71-3 WSM-M Machine Body 8. Rubber track (1) Bending senter (2) Core lengs Spec items KX61-3 EU KX71-3 EU KX71-3 PP Type 300 x 80 x 53 Circunference 4240 mm Number of steel cords Thickness of crawler main part 34.5 mm...

  • Page 34: Iron

    KX61-3, KX71-3 WSM-M Machine Body 9. Iron track (1) Master link, L (6) Stop pin (2) Master link, R (7) Track link, L (3) Bush (8) Track link,R (4) Master pin (9) Track pin (5) Track shoe M-II-12...
  • Page 35 KX61-3, KX71-3 WSM-M Machine Body 10.Track conversion 10-1 Iron track Rubber track Remove slide plates (080) and track guide (100). Move the rubber crawler until the joint Rubber crawler Seam joint marking (∞) comes at the top center Upper roller (see left) and the upper roller comes between the links.
  • Page 36 KX61-3, KX71-3 WSM-M Machine Body b. Water and oil quantity Unit KX61-3 (EU) KX71-3 (EU) KX-71-3 (PP) Remarks ← ← Radiator US gal 1.42 Kubota LLC-N-50F ← ← Reserve tank US gal 0.29 SAE10W30(CD) ← ← Engine Crank case Without filter US gal 1.18...
  • Page 37 Performance curve : KX61-3 EU, V1505-E2-BH-9-EU ..M-III-3 d. Performance curve : KX71-3 EU, V1505-E2-BH-10 EU ..M-III-4 e. Performance curve : KX71-3 PP, V1505-E2-BH-10 ... M-III-5 M-III-1...
  • Page 38 KX61-3, KX71-3 WSM-M Engine .Engine a. Engine Specifications Machine model KX61-3 EU KX71-3 EU KX71-3 PP Engine Model V1505-E2-BH-9-EU V1505-E2-BH-10-EU V1505-E2-BH-10 Gross Gross Gross No. of cylinder ← ← 78×78.4 ← ← Bore × Stroke 3.07×3.09 ← ← 1498 ←...
  • Page 39 KX61-3, KX71-3 WSM-M Engine c. Performance curve : KX61-3 EU, V1505-E2-BH-9-EU M-III-3...
  • Page 40 KX61-3, KX71-3 WSM-M Engine d. Performance curve : KX71-3 EU, V1505-E2-BH-10 EU M-III-4...
  • Page 41 KX61-3, KX71-3 WSM-M Engine e. Performance curve : KX71-3 PP, V1505-E2-BH-10 M-III-5...
  • Page 42 KX61-3, KX71-3 WSM-M Engine M-III-6...
  • Page 43 KX61-3, KX71-3 WSM-M Hydraulic System IV.Hydraulic System ....M-IV-2 a. Hydraulic System Feature ......M-IV-2 b.
  • Page 44 KX61-3, KX71-3 WSM-M Hydraulic System .Hydraulic System a. Hydraulic System Feature Item KX61-3 EU KX71-3 EU KX71-3 PP Variable displacement piston pump with constant torqrol system Travel safety pilot line Main pump (P ) unload spool Travel straight system Confluence service flow...
  • Page 45 KX61-3, KX71-3 WSM-M Hydraulic System φ 2.7equ. φ 2.0equ. φ 2.0equ. φ 1.0equ. φ 2.0equ. φ 1.0equ. φ φ 2.9equ. φ 2.0equ. φ (10) 1.2equ. φ (11) 0.9equ. φ (12) 2.2equ. φ (13) Relief pressure, bench (MPa) a1, a2 22.5 17.2...
  • Page 46 φ (14) 2.2equ. φ Relief pressure, bench (MPa) a1, a2 23.5 20.6 26.5 26.5 26.5 26.5 26.5 26.5 17.6 E, speed (rpm) 2300 2300 2300 2300 Displacement (cc/rev) 14.0 14.0 Discharge(l/min) 32.2 32.2 18.4 2. KX71-3: EU - version M-IV-4...
  • Page 47 (13) 2.2equ. φ (14) Relief pressure, bench (MPa) a1, a2 21.6 20.6 24.5 24.5 24.5 24.5 24.5 24.5 17.7 E, speed (rpm) 2300 2300 2300 2300 Displacement (cc/rev) 14.0 14.0 Discharge(l/min) 32.2 32.2 18.4 3. KX71-3: PP - version M-IV-5...
  • Page 48 KX61-3, KX71-3 WSM-M Hydraulic System 4. Hydraulic components ; KX71-PP-version Pump assy Change valve (PP-version) Pilot filter Pilot valve, L Pilot valve, R Control valve assy Travel motor, R Rotary joint Swivel motor (10) Travel motor, L (11) TPSS valve (PP-version) "...
  • Page 49 KX61-3, KX71-3 WSM-M Hydraulic System c. Main pump 1. Outer view KX61-3 KX71-3 Anti-wear hydraulic fluid Hydraulic fluid ISO VG 32, 46. 68 14+14+8+2.7 cm /rev Volume Temperature range -20 ~ 100 °C (P1+P2+P3+P4) ∗ × Viscasity range 10 ~ 1000 mm...
  • Page 50 KX61-3, KX71-3 WSM-M Hydraulic System 2. structure (1) Body S (11) Needle (25) Stopper pin A (39) O - ring (62) Seal washer (2) Body H (12) Ball (27) Stopper pin B (40) O - ring (65) Gear pump (3) Shaft...
  • Page 51 KX61-3, KX71-3 WSM-M Hydraulic System 3. P-Q performance curve Pressure: P (MPa) Test condition Test condition ISOVG46 14 cc/rev Oil temp 50 ± 5 °C 8 cc/rev 2100/2300 rpm 2.7 cc/rev Direction Clockwise 40 kgf/cm 4. Pump Specifications, Type : PVD-1B-28P-8G3-4575A 1.Capacity...
  • Page 52 KX61-3, KX71-3 WSM-M Hydraulic System M-IV-10...
  • Page 53 KX61-3, KX71-3 WSM-M Hydraulic System d. Control valve assy 1. KX61-3: EU - version, Code No:RG248-61131, Maker: Hydro control M-IV-11...
  • Page 54 KX61-3, KX71-3 WSM-M Hydraulic System 2. KX71-3: EU - version, Code No:RG448-61131, Maker: Hydro control M-IV-12...
  • Page 55 KX61-3, KX71-3 WSM-M Hydraulic System 3. KX71-3: PP - version, Code No:RC348-61131, Maker: NABCO M-IV-13...
  • Page 56 KX61-3, KX71-3 WSM-M Hydraulic System 4. Control valve section : KX71-3 PP - version (RB448-61131) 4-2 B-B : Dozer section 4-3 H-H : Confluence section (1) Swivel (2) Dozer (3) Swing (4) Confluence (5) Service (6) Arm (7) Travel, L (8) Inlet...
  • Page 57 KX61-3, KX71-3 WSM-M Hydraulic System 4-4 E-E : Service section 4-5 F-F : Arm section 4-6 G-G : Travel R section M-IV-15...
  • Page 58 KX61-3, KX71-3 WSM-M Hydraulic System 4-7 H-H : Inlet section 4-8 I-I : Travel R section 4-9 J-J : Boom section M-IV-16...
  • Page 59 KX61-3, KX71-3 WSM-M Hydraulic System 4-10 K-K : Boom lock valve 4-11 N-N : Book lock 4-12 L-L : Bucket section M-IV-17...
  • Page 60 KX61-3, KX71-3 WSM-M Hydraulic System e. Pilot valve 1. EU - version Maximum permissible operating torque at lever: 8 daN.m Note : Pilot valve is identical among KX36-3, 41-3, 61-3 and KX71-3 for EU-version. M-IV-18...
  • Page 61 KX61-3, KX71-3 WSM-M Hydraulic System 2. KTC, KCL, KTA-version This pilot valve is identical among KX-91-3 and KX71-3. assy No.=RC411-61721 (Kawasaki HI make) 2-1 Structure & specifications 121: Not to be reused. 212: Grease is applied on each top part.

  • Page 62: Specifications

    KX61-3, KX71-3 WSM-M Hydraulic System Specifications (1) MAX PRIMARY PRESSURE 6.9 NPa(70 kgf/cm (2) MAX BACK PRESSURE 0.3 NPa(3 kgf/cm (3) RATED FLOW 15 l/min (4) SECONDARY PRESSURE CHARACTRISTICS : Refer to the “Control Diagram“ shown below. (5) OPRERATING TORQUE Refer to the “Control Diagram“...
  • Page 63 KX61-3, KX71-3 WSM-M Hydraulic System 2-2 Pilot valve control diagram (mm) (mm) (deg) M-IV-21...

  • Page 64: Km/H

    KX61-3, KX71-3 WSM-M Hydraulic System 3. Technical data : Travel motor Machine model KX61-3 KX71-3 EU KX71-3 PP Low speed 16.8 (1.02) 18.4 (1.12) 18.082 (1.10) Motor Displacement cc(cu-in) / rev High speed 10.1 (0.62) 116 (0.71) 10.570 (0.64) Gearbox ratio 1 : 42.4...
  • Page 65 KX61-3, KX71-3 WSM-M Hydraulic System f. Travel motor 1. Structure 1-1 EU - version; Maker: Transmital Bonfiglioli G 3/8 19 TPI (JIS B 2351 “0” RING BOSS) SERVICE PORT G 1/4 19 TPI (JIS B 2351 “0” RING BOSS) DRAIN PORT...
  • Page 66 KX61-3, KX71-3 WSM-M Hydraulic System 1-2 KX71-3 PP-version Motor rotating direction Pressure port Return port Direction M-IV-24...
  • Page 67 KX61-3, KX71-3 WSM-M Hydraulic System 2. Circuit diagram (KX61-3, 71-3 EU-version) (KX71-3 PP-version) (1) Motor-gear case assy (2) Counterbalancer valve M-IV-25...

  • Page 68: Technical Data

    KX61-3, KX71-3 WSM-M Hydraulic System g. Swivel motior 1. Technical data Items Unit KX61-3 EU KX71-3 EU KX71-3 PP Manufacturere Nachi - Fujikoshi Corp. PCR-1B-05A-P- Type PCR-1B-05A-P-8290A 8289A Motor capacity 20.0 (1.22) 22.1 (1.35) cc/rev (in /rev) Gear reduction ratio...
  • Page 69 KX61-3, KX71-3 WSM-M Hydraulic System 2. Outer view Direction of rotation (View from pinion shaft) Direction of Rota- Flow inlet Flow outlet tion Clockwise B port A port Counter clockwise A port B port M-IV-27...
  • Page 70 KX61-3, KX71-3 WSM-M Hydraulic System 3. Inner parts Body Pre-load coller Carrier 1 Bearing Pinion shaft Bearing B1 gear Oil seal Needle Screw Ring seal Ring O ring Ring Thrust plate M-IV-28...
  • Page 71 KX61-3, KX71-3 WSM-M Hydraulic System Body H O ring Plate S Snap Shaft Spring pin Cylinder Barrel Oil seal Valve plate Piston Shoe Break piston Shoe holder Spring assy Barrel holder Disk plate Swash plate O ring Retainer O ring...
  • Page 72 KX61-3, KX71-3 WSM-M Hydraulic System Seat Spacer Retainer O ring Popeet O ring Piston O ring O ring Spring Back up ring M-IV-30...
  • Page 73 KX61-3, KX71-3 WSM-M Hydraulic System 4. Sectional view (KX61-3, 71-3 Swivel motor assy) M-IV-31...
  • Page 74 KX61-3, KX71-3 WSM-M Hydraulic System a.Reduction gear GCG-05-1-8289 101 Body 102 Carrier 1 104 Pinion shaft 106 B1 gear 111 Needle 113 Ring seal 114 O ring 115 Thrust plate 119 Pre-load collar 121 Bearing 122 Bearing 123 Oil seal...
  • Page 75 422 (16.6) supplier Wipro Wipro Wipro Wipro Wipro Parts No. RC348-99901 bore 70 (2.76) KX71-3 40 (1.57) (KCL, stroke 431 (17.0) KTA) S length 791 (31.1) supplier Wipro S length : Mini, contracted length Sample : KX71-3 US Boom cylinder M-IV-33...
  • Page 76 KX61-3, KX71-3 WSM-M Hydraulic System i. Rotary joint (10) (14) (13) (12) (13) (14) (11) (15) (17) (13) (12) (20) (16) (19) (17) (18) (22) (21) (15) (13) (19) (18) (12) (1) Shaft (8) Plug (15) C:Dozer up (2) Collar...
  • Page 77 KX61-3, KX71-3 WSM-M Hydraulic System j. Accessories of hydraulic components Unload valve (Change valve) : North America and Oceanea - version 1-1 Structure Maker : Nishina Black (1) Shim (11) Plug (2) spring (12) Hollow bolt (3) Name plate (13) Washer...
  • Page 78 KX61-3, KX71-3 WSM-M Hydraulic System 2. Change valve with accumulator : EU version 2-1 Structure Maker:Hydro control filter Swivel motor Pilot valve(Right) Pilot valve(Left) To swivel joint To pump P 2-2 Specifications 1) Max. oil flow : 16 l/min (4.23 Us gal.) 2) Rated voltage and output : 12 V - 18W 3) Coil resistance : 8 Ω...
  • Page 79 KX61-3, KX71-3 WSM-M Hydraulic System 3. TPSS valve (Two pattern selection system) 3-1 Specifications • Max. oil flow : 4 l/min (1.06 US gal.) • Operating pressure : 3.9 MPa (40 kgf/cm • Oil leakage : 30 cc/min or less (At 2.0 MPa, 50 ±5°C) •...
  • Page 80 KX61-3, KX71-3 WSM-M Hydraulic System 4. Oil cooler 4-1 Specifications • Heat radiation capacity = 10.3 KW • Core type : Corrugate fine with rouver • Core size : 300 W × 255.6 H × 32 D (mm), 15 tier •...
  • Page 81 (6.86 MPa) 996 psi μ Filtering rate Valve setting pressure:1.5 kgf/cm (0.15 MPa) 21 psi Max. flow amount :10 l/min (2.64 US gal) Applied model= KX71-3, 91-3, 101-3 (1) Head (2) Bypass valve (3) Filter element (4) O-ring (5) Case M-IV-39...
  • Page 82 KX61-3, KX71-3 WSM-M Hydraulic System 6. Suction filter 6-1 Specifications (RB411-62151) • Percolation grade : 150 mesh (105 μ) • Percolation area : 513 cm (5522 sq·ft) • Oil flow : Max. 100 l/min (26.4 US gal/min) (1) : Cover, (2) : Bottom assy, (3) : Screen, (4) Tube...
  • Page 83 KX61-3, KX71-3 WSM-M Hydraulic System 7. Return filter 7-1 Specifications (RB411-62191) • Percolation area : 3670 cm (39504 sq·ft) • Relief valve set pressure : 98.1 ±14.7 KPa (1 ±0.15 kgf/cm2) 14.2 ±2.1 psi • Durable pressure : 588 KPa (6 kgf/cm ) 85.3 psi or more...
  • Page 84 KX61-3, KX71-3 WSM-M Hydraulic System 8. Check valve Body Poppet Spring Circlip, H O-ring Set pressure ; M-IV-42...
  • Page 85 KX61-3, KX71-3 WSM-M Hydraulic System k. Maintenance specification 1. Main relief valve (at the measurement port on the machine) Location Operating work Unit KX61-3 EU KX71-3 EU KX71-3 PP Remarks 22.6 ±1.0 23.5 ±1.0 21.6 ±1.0 Travel right, Boom, Pump 1, a1 230 ±10...
  • Page 86 ← ← Dozer cylinder Down sec. 3.0 ±0.3 2.8 ±0.3 (A)New machine reference value (B)Allowable limit 4. Cylinder natural fall amount KX61-3 EU KX71-3 EU/ KX71-3 PP Unit Remarks 126/144 include bucket Load weight 278/317 weight Boom cylinder 0.79 3.94 0.79...
  • Page 87 Development concept ........M-V-2 b. Outline of Kubota ICS (Intelligent Control System) ... . M-V-5 c.
  • Page 88 KX61-3, KX71-3 WSM-M Electrical System .Electrical System a. Development concept 1. Background of Adoption of New Meter (1) The L1 (3-ton class) Series, which was released in Japan in 1999 for domestic users, adopted a new meter of LCD type (called YUYU NAVI). Since then, this meter has been one of the sales points of the Series.
  • Page 89 KX61-3, KX71-3 WSM-M Electrical System (Reference) LCD Display Examples of New Meter Fig. 1 Normal screen Key switch ON (Only the glowing moment) Normal screen (with the tachometer selected) Normal screen (with the hourmeter selected) Fig. 2 Language selection screen Fig.
  • Page 90 KX61-3, KX71-3 WSM-M Electrical System 3. Electrical system : Functional comparison : KX61-3, KX71-3 North America & Function EU-version Oceanea KICS;Kubota Intelligent Control System, LCD(liquid crystal display) with character and illustration Yes (delete Yes (delete Maintenance indication upon hour meter...
  • Page 91 KX61-3, KX71-3 WSM-M Electrical System b. Outline of Kubota ICS (Intelligent Control System) M-V-5...
  • Page 92 KX61-3, KX71-3 WSM-M Electrical System M-V-6...
  • Page 93 KX61-3, KX71-3 WSM-M Electrical System M-V-7...
  • Page 94 KX61-3, KX71-3 WSM-M Electrical System c. Operating Mode 1. Outline In operating mode, normally LCD shows three types of information. 1) Key switch ON, 2) Normal display, hour meter 3) Normal display, tachometer When in trouble, LCD shows warning and failure indications as shown below.
  • Page 95 KX61-3, KX71-3 WSM-M Electrical System 2. LCD display list Below list shows all LCD letter indications for both oparating mode and service mode. In operating mode, data 003 ~ 022 will be on the display according to the machine condition.
  • Page 96 KX61-3, KX71-3 WSM-M Electrical System English name meaning and explanation data023 Indicates the model name. data024 Indicates the model name. data025 Indicates the model name. data026 Indicates the model name. data027 Indicates the model name. data028 Indicates the model name.
  • Page 97 KX61-3, KX71-3 WSM-M Electrical System English name meaning and explanation data055 Literary it means other menus. This means micro computor is ready to check electrical harness conditions, break data056 or breaking. In this case, for your sefety engine should be off.
  • Page 98 KX61-3, KX71-3 WSM-M Electrical System d. Service mode menues 1. Outline Service mode is basically for dealer’s service personel. This mode is so designed to initialize machine’s condition, additional attachment and control system. and also diagnose machine trouble. Display indication items are listed in page 3-9 and 3-10, from data number 023 ~ 085.
  • Page 99 KX61-3, KX71-3 WSM-M Electrical System 3. Main menues and functions 3-1 Selection Method of 11 Languages If the key is turned ON with the display selector pressed, the name of the model presently selected will appear. When the finger is off the display selector, the next language selection screen will appear. The infor- mation on the selected model is important.
  • Page 100 A revolution sensor is mounted to the injection pump gear. The gear ratio varies with the model as described below. KX41-3's gear ratio: 46 KX61-3 and KX71-3's gear ratio: 54 KX91-3, KX101-3, KX121-3, and KX161-3 gear ratio: 68 Calculation Method A single rotation of the injection pump corresponds to two engine rotations.
  • Page 101 KX61-3, KX71-3 WSM-M Electrical System 3-3 Fail recoord dump The fail record can be displayed by selecting Diagnosis and Fail record. (See fig. 3.) By selecting the Fail record, the system reads the contents of the EEPROM and checks the information on failures.
  • Page 102 KX61-3, KX71-3 WSM-M Electrical System 3-5 Machine model setup Model settings can be made by selecting Set up and Set up machine. (See fig. 6.) Here, information on the model and the country of manufacturer is selected. By selecting the country of manufacturer, European specifications and North American specifications are distinguished.
  • Page 103 KX61-3, KX71-3 WSM-M Electrical System 3-7 Simple mode set-up --- Chinese-version only Simple-mode settings can be made by selecting Set up, Engine start, Set up machine, and Simple mode. (See fig. - .) While in simple mode, the output will be turned OFF when the fail-safe function is activated, but no mes- sages will be output.
  • Page 104 KX61-3, KX71-3 WSM-M Electrical System 3-9 All Fail Record All the accumulated failure records can be shown by selecting Other menu, Other menu, and All fail record (See Fig.6.). By selecting All fail record, the first hour meter items generated after shipping through the last one will be shown.
  • Page 105 KX61-3, KX71-3 WSM-M Electrical System 3-12 Servive hour meter check The service hour meter can be checked and altered by selecting Other menu, Other menu, and Service hour meter. Only the display selector switch is used to make value changes. The service hour meter will be changed when the meter is replaced, because the service hour meter will not be synchronized with the hour meter, and warnings will not be displayed in a timely manner.
  • Page 106 KX61-3, KX71-3 WSM-M Electrical System 3-16 Auto glow control The glow will be turned ON for an optimum time according to the temperature of engine cooling water. 3-16-1 Key-ON Processing Water temperature: The glow-ON time is obtained from the glow time map (see Fig. 1, 2). The glow will not, however, turn ON while the engine is working or the temperature is 81 C or over.
  • Page 107 KX61-3, KX71-3 WSM-M Electrical System Glow ON/OFF Conditions The glow will turn ON under any of the following conditions: The engine revolution is 1000 rpm or below; the engine oil pressure switch is OFF (the input terminal of the engine oil pressure switch is H); the charge is OFF (the L input terminal is H).
  • Page 108 KX61-3, KX71-3 WSM-M Electrical System 3. FYI (For your information) water [V] temp [°C] 0.33 0.409 0.504 0.634 0.795 1.26 1.58 1.96 2.86 3.36 3.77 4.15 4.44 4.66 4.89 4.94 M-V-22...
  • Page 109 KX61-3, KX71-3 WSM-M Electrical System 3-17 Travel high - low switch control 1. Change travel speed by pressing the high - low switch on the dozer control lever. Refer to the control flow. 2. The travel mechanism will start in low gear to ensure safety when the key is turned ON.
  • Page 110 KX61-3, KX71-3 WSM-M Electrical System 3-18 Fuel amount control 1. Outline A map indicating the voltage and fuel relationship has been prepared by plotting each determined input voltage based on the float position of the fuel sensor and the remaining fuel.
  • Page 111 KX61-3, KX71-3 WSM-M Electrical System 2. Meter display 1) The LCD with four vertical dots and 37 horizontal dots is used to display the fuel gauge. Fuel level, Litter KX41-3 KX61-3, 71-3 Full in tank 19 ± 3 42 ± 3 Sensor upper limit 17 ±...
  • Page 112 KX61-3, KX71-3 WSM-M Electrical System 3. Fuel Replenishment Assist Function While replenishing fuel by pressing any switch after the key is turned OFF, the buzzer interval will change according to the quantity of fuel replenished. When the fuel in the tank is not much, the buzzer will be heard at long intervals.
  • Page 113 KX61-3, KX71-3 WSM-M Electrical System 3-19 Startor auto release control 1. Outline 1) If the key freezed in the start position, the auto release relay is turned OFF to prevent damage to the startor motor. At the same time, the glow relay will be turned OFF forcibly to prevent damage to the glow plug.
  • Page 114 KX61-3, KX71-3 WSM-M Electrical System 2. Auto release Circuit diagram & function Auto release relay (Starter relay) NO - type Key SW Key ON Start Is the key switch set at "START"? Engine speed sensor Has the engine started? Automatic release...
  • Page 115 KX61-3, KX71-3 WSM-M Electrical System 3) If the key switch fails to return and the engine speed sensor is also in trouble a.Key switch start signal 30 sec b.Engine speed sensor signal c.Release relay solenoid If the key switch start signal is detected to have been on for 30 seconds, the automatic release con- trol system (3) cuts the transistor's base current flow, which turns off the auto release relay solenoid (1) and turns off the starter motor’s solenoid.
  • Page 116 KX61-3, KX71-3 WSM-M Electrical System 4. Operational flow chart M-V-30...
  • Page 117 KX61-3, KX71-3 WSM-M Electrical System M-V-31...
  • Page 118 KX61-3, KX71-3 WSM-M Electrical System < Engine speed and condition of auto release relay > Engine speed : N Time : T Auto release relay = > Within 6 seconds 801 ~ 950 After 6 seconds Within 0.5 seconds After 0.5 seconds...
  • Page 119 KX61-3, KX71-3 WSM-M Electrical System 3-20 Service hour meter A service maintenance message will appear when the preset hour meter item is activated. The message will disappear in 10 seconds. Hereafter, whenever the key is turned OFF and ON, the mes- sage will appear for the first 10 seconds.
  • Page 120 KX61-3, KX71-3 WSM-M Electrical System e. Failure Diagnosis 1. Failure display and diagnosis criteria The following table 1 shows data on failure diagnosis, for operating mode and service mode. Note: • Display items of the system in service mode can be checked with the fail record.
  • Page 121 KX61-3, KX71-3 WSM-M Electrical System Display Function stop EEPROM Buzzer Lamp Reset method Method of diagnosis point address Operating mode service mode 21 AUX.volum 21 AUX volum Momen- Cancel AUX 72, 92 At 5 V (normal). tarily AUX specifications. AUX mode turns ON.

  • Page 122: To 15.7

    KX61-3, KX71-3 WSM-M Electrical System 2. Fail record in EEPROM If the sensor or actuator line has an error, the output of the actuator will stop and the LCD will display the contents of the error while the error point is written to the EEPROM. Fig. 2 and fig. 3 show the address allo- cation of the EEPROM.
  • Page 123 Original manufacturer use Address No. 118 : Machine serial No. Fig.2.Address and contents of EEPROM Ref.1 : 0:KX41-3, 1:KX61-3, 2:KX71-3, KX91-3, 4:KX101-3, 5:KX-121-3, 6:KX161-3, ··· Ref.2 : bit No : 0 : Made in Japan, 1 : made in Germany...
  • Page 124 KX61-3, KX71-3 WSM-M Electrical System Address No. Contents of failure Data bit 3 Charge 2 Engine oil 4 High voltage 11 Accel sensor 13 AI motor short 14 AI motor break 12 Governor sensor 21 Aux.volume 22 Aux.solenoid L short The leftmost 12 bits display the hour meter value of 23 Aux.solenoid L break...
  • Page 125 KX61-3, KX71-3 WSM-M Electrical System 3. self-diagnosis of controller unit 3-1 Purpose The error diagnosis of the meter is possible by using the self-diagnostic harness. The self-diagnostic function of a conventional model provided with a microcontroller can detect failures in the microcontroller only after all the failure diagnosis of the electrical devices other than the microcontroller is made.
  • Page 126 KX61-3, KX71-3 WSM-M Electrical System The red and yellow lamps flash alternately. The LCD of the meter flashes black and white alternately. The lamp as shown in the illustration on the right-hand side turns ON and OFF repeatedly. The buzzer beeps.
  • Page 127 KX61-3, KX71-3 WSM-M Electrical System 3-3 Failure Display Number of Self-diagnostic Function Table 2. Self - diagnosis of controller, items and methods Fail Check item Check parts Check methods indication Check sum CPU ROM Implement self-checksum. Turn OFF the glow relay and make sure that pin 29 Glow relay output (RXD2 power 7.1) is set to low level.
  • Page 128 KX61-3, KX71-3 WSM-M Electrical System Fail Check item Check parts Check methods indication Motor Tr1, Tr2, Tr3, and Tr4 are set to low output Motor Tr1, Tr2, Tr3, and Tr4 output level. Input & output AI operation switch input, travel The AI operation switch is set to low level.
  • Page 129 KX61-3, KX71-3 WSM-M Electrical System FYI (For your information) Check Sum Error 1. A check sum error is checked to see if the contents of the program for microcomputer control are cor- rupted. 2. The control program is saved in the ROM of the CPU. Once data is written to the ROM and shipped to the market, the data cannot be written in the market.
  • Page 130 KX61-3, KX71-3 WSM-M Electrical System 3-4 Functions of Self-diagnostic Harness The harness short-circuits the input and output terminals of the meter in advance, switches the respec- tive inputs of the meter ON and OFF in sequence, and checks if the data on the output side is normal.
  • Page 131 KX61-3, KX71-3 WSM-M Electrical System 4. Electrical component layout (13) (15) (10) (11) (21)(20)(19)(18) (25) (24) (22) (1) Main key SW (17) Coupler (2) Hi - Low SW (18) Cab relay (3) Meter coupler (19) Light relay (4) Hi - Low lamp...
  • Page 132 5. Service Mode KX61-3, KX71-3(Non-AI Non- anti-theft Non-S/O) ver 1.13 Note: push switch for short time push switch for long time...
  • Page 133 KX61-3, KX71-3 WSM-M Electrical System f. Circuit wiring diagram 1. KX61-3, KX71-3 Export (EU) (US) M-V-47...
  • Page 134 KX61-3, KX71-3 WSM-M Electrical System 2. KX61-3, KX71-3 Export standard type M-V-48...
  • Page 136 KUB O T A Corporation CONSTRUCTION MACHINERY DIVISION 1-1-1 NAKAMIYA-OHIKE, HIRAKATA-CITY, OSAKA, JAPAN ED I TO R : CONSTRUCTION MACHINERY MANUFACTURING DEPT. SERVICE SECTION HIRAKATA PLANT 1-1-1 NAKAMIYA-OHIKE, HIRAKATA-CITY, OSAKA, JAPAN PHONE :+81-72-840-1195 :+81-72-890-2886 KUBOTA Corporation Printed in Japan 0408.CMC.e.10 Code No.97899-61040...

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