Kubota U48-4 Workshop Manual
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Kubota U48-4 Workshop Manual

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WORKSHOP MANUAL
KUBOTA EXCAVATOR
U48-4, U55-4
KiSC issued 03, 2010 A

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Summary of Contents for Kubota U48-4

  • Page 1 WORKSHOP MANUAL KUBOTA EXCAVATOR U48-4, U55-4 KiSC issued 03, 2010 A...
  • Page 2 CONTENTS TO THE READER 7. TRAVEL MOTOR........3-M60 TO THE READER 8. HYDRAULIC CYLINDER ......3-M82 9. PILOT VALVE ......... 3-M92 INFORMATION 10. UNLOAD VALVE ........3-M103 CONTENTS 11. HOLDING VALVE ......... 3-M107 INFORMATION 12. SERVICE PORT ........3-M111 1. SAFETY FIRST ..........I-1 SERVICING 2.
  • Page 3 Please be aware that changes to the content may be made without prior notice. NOTE • Corresponding model list Machine Model Engine Model U48-4 For European Union V2607-DI-E3-BH U55-4 March, 2010 © KUBOTA Corporation 2010 KiSC issued 03, 2010 A...
  • Page 4 TO THE READER U48-4,U55-4, WSM Record of Revisions Last digit of the Date Main Revised Point and Corrective Measures Person-in-charge Code No. KiSC issued 03, 2010 A...
  • Page 5 INFORMATION KiSC issued 03, 2010 A...
  • Page 6 INFORMATION CONTENTS 1. SAFETY FIRST ..........................I-1 2. SAFETY DECALS .......................... I-4 KiSC issued 03, 2010 A...
  • Page 7 INFORMATION U48-4,U55-4, 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 8 INFORMATION U48-4,U55-4, WSM SAFETY WORKING • 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 9 INFORMATION U48-4,U55-4, 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 10 INFORMATION U48-4,U55-4, 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. RY9212007INI0010US0 DANGER, WARNING AND CAUTION LABELS (1) Part No.
  • Page 11 INFORMATION U48-4,U55-4, WSM (1) Part No. RD809-57450 - Do not touch hot parts such as exhaust etc. (2) Part No. RD809-57250 - Do not allow any persons within the working range. (3) Part No. T1060-30090 - Keep sparks, flame, cigarettes away.
  • Page 12 INFORMATION U48-4,U55-4, WSM (1) Part No. RD809-57390 - When using a wider or deeper bucket, take good care when swinging or pulling in the front attachments to make sure that the bucket does not hit the cab. (2) Part No. RB419-57930 - Label front door lock (3) Part No.
  • Page 13 INFORMATION U48-4,U55-4, WSM (1) Part No. RD809-57950 - For information about loosening the crawler, consult the operating instructions. (2) Part No. RC108-57960 - Attachment point for lifting gear. (3) Part No. RD809-57250 - Do not enter the manoeuvring area. (4) Part No. RB419-57960 - Not an attachment point for lifting gear! (5) Part No.
  • Page 14 2. Clean danger, warning and caution labels with soap and water, dry with a soft cloth. 3. Replace damaged or missing danger, warning and caution labels with new labels from your KUBOTA dealer. 4. If a component with danger, warning and caution label(s) affixed is replace with new part, make sure new label(s) is (are) attached in the same locations(s) as the replace component.
  • Page 15 GENERAL KiSC issued 03, 2010 A...
  • Page 16 GENERAL CONTENTS 1. CHECKING EXCAVATOR IDENTIFICATION ................G-1 2. ENGINE IDENTIFICATION ......................G-2 [1] MODEL NAME AND SERIAL NUMBER ................G-2 [2] E3B ENGINE .......................... G-3 [3] CYLINDER NUMBER ......................G-3 3. GENERAL PRECAUTIONS......................G-4 4. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING ........G-8 [1] WIRING ..........................
  • Page 17 GENERAL U48-4,U55-4, WSM 1. CHECKING EXCAVATOR IDENTIFICATION When consulting with your local KUBOTA dealer about this mini-excavator, please provide the model of the mini-excavator, its frame and engine numbers and the number of hours on the hour meter. (1) Mini-excavator Nameplate...
  • Page 18 GENERAL U48-4,U55-4, WSM 2. ENGINE IDENTIFICATION [1] MODEL NAME AND SERIAL NUMBER Be sure to check the engine nameplate and serial number when you wish to consult about the engine. The model and serial number of the engine need to be checked prior to servicing the engine or replacing any of its parts.
  • Page 19 Whenever repairs or service is performed on a ###-E3B series engine, E3B engine replacements parts, which are in the applicable E3B KUBOTA Parts List, must be used and the KUBOTA Operator's Manual and E3B Workshop Manual must be used for maintenance. Use of incorrect replacement parts or replacement parts from other emission level engines (for example : E2B engines), may result in emission levels out of compliance with the original E3B design, EPA and/or other applicable regulations.
  • Page 20 Whenever a special tool is required, use the special tool that KUBOTA recommends. Make any special tools that are not used very frequently according to the diagrams in this manual. Always use genuine KUBOTA parts to maintain the performance and safety characteristics of the mini-excavator.
  • Page 21 GENERAL U48-4,U55-4, WSM Floating Seal • Be sure to wipe off any oil from the O-ring or surfaces that touch the O-ring. (For wheel motors, apply a light film) • When putting an O-ring into a floating seal, make sure the O-ring does not twist.
  • Page 22 GENERAL U48-4,U55-4, WSM Tightening Bolts and Nuts • Tighten bolts and nuts to their specified torque. • Tighten nuts and bolts alternately top/bottom (a) (b), left/right so the torque is distributed evenly. (A) Top/bottom alternately (C) Diagonally across the center...
  • Page 23 GENERAL U48-4,U55-4, WSM Installing and Removing Quick Couplings • To remove a quick hose coupling, push the fitting (2) in the direction of the arrow and pull on the plastic part (1) in the opposite direction. • To attach a quick coupler, push it in firmly in the direction of the arrow.
  • Page 24 GENERAL U48-4,U55-4, WSM 4. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING Follow the precautions below for handling electrical parts and wiring to ensure safety and prevent damage to the mini-excavator and nearby equipment. IMPORTANT • Inspect electrical wiring for damage and/or loose connections.
  • Page 25 GENERAL U48-4,U55-4, WSM • Insert grommet securely. (1) Grommet (A) Correct (B) Incorrect RY9212001GEG0027US0 • Clamp wiring securely but do not damage wires with the clamp. (1) Clamp (Spiral clamp around wire) (3) Clamp (2) Wire (4) Welding Mark RY9212001GEG0028US0 •...
  • Page 26 GENERAL U48-4,U55-4, WSM [2] FUSES • Always use fuses of the specified capacity. Never use over or undersized fuses. • Never use copper or steel wire in place of a fuse. • Do not install accessories such as work lights, radios, etc., if your mini-excavator does not have an auxiliary circuit.
  • Page 27 GENERAL U48-4,U55-4, WSM • The plastic covers of connectors must cover them completely. (1) Cover (A) Correct (B) Incorrect RY9212001GEG0037US0 [4] WASHING THE EXCAVATOR WITH A HIGH-PRESSURE WASHER Using a high-pressure washer incorrectly can lead to personal injury and/or damage, break or cause parts of the mini-excavator to fail, so use the power washer properly according to its user's manual and labels.
  • Page 28 GENERAL U48-4,U55-4, WSM 5. TIGHTENING TORQUES [1] GENERAL USE SCREWS, BOLTS AND NUTS Screws, bolts and nuts whose tightening torques are not specified in this Workshop Manual should be tightened according to the table below. Indication on top of bolt...
  • Page 29 GENERAL U48-4,U55-4, WSM [3] TORQUE FOR HYDRAULIC HOSE FITTINGS (1) Torque for Hydraulic Hose Fittings Union Nuts 7.8 to 11.8 N·m 0.8 to 1.2 kgf·m 5.7 to 8.7 lbf·ft 24.5 to 29.2 N·m 2.5 to 3.0 kgf·m 18.1 to 21.7 lbf·ft 37.2 to 42.1 N·m...
  • Page 30 GENERAL U48-4,U55-4, WSM (2) Torques of Lock-Nuts for Elbows with Male Seats and Adaptors with O-rings (Straight Threads) 15.0 to 16.5 N·m 1.5 to 1.7 kgf·m 11.1 to 12.2 lbf·ft 24.5 to 29.4 N·m 2.5 to 3.0 kgf·m 18.1 to 21.7 lbf·ft 49.0 to 53.9 N·m...
  • Page 31 GENERAL U48-4,U55-4, WSM [4] HOSE CLAMP SCREW TORQUE Type 1 2.5 to 3.4 N·m 10- 14 6C040-58721 25 to 35 kgf·cm 1.8 to 2.5 lbf·ft 2.5 to 3.4 N·m 12- 16 09318-89016 25 to 35 kgf·cm 1.8 to 2.5 lbf·ft 2.5 to 3.4 N·m...
  • Page 32 GENERAL U48-4,U55-4, WSM Type 2 2.5 to 3.4 N·m 13- 20 RB101-63631 25 to 35 kgf·cm 1.8 to 2.5 lbf·ft 4.9 to 5.9 N·m 15- 25 RC101-64581 50 to 60 kgf·cm 3.6 to 4.3 lbf·ft 4.9 to 5.9 N·m 19- 28 R1401-63211 50 to 60 kgf·cm...
  • Page 33 (18) Travel parking brake as standard Shortened distance between blade and bucket Others teeth Operator comfort (19) KUBOTA original digital panel at the Front * Leading-edge Anti-theft system for greater Spacious and comfort cabin (20) security (10) Powerful Air conditioning...
  • Page 34 • Auxiliary hydraulic circuits (SP1 and SP2*) piping to the arm end *for Types L and M. • 2 working lights on cabin and 1 light on the boom • 1450 mm arm length (U48-4) • 1570 mm arm length (U55-4) Cabin •...
  • Page 35 GENERAL U48-4,U55-4, WSM Optional Equipment Undercarriage • 400 mm steel track (+ 100 kg) • 550 mm steel track (+ 300 kg) Safety system • Anti-drop valve unit (arm and blade) • Bracket and harness for beacon light Others • Special paint upon request...
  • Page 36 GENERAL U48-4,U55-4, WSM 7. NEW FEATURES OUTLINE New Design Digital Meter Panel Features : 1. Large LCD display 2. Display and anti-theft controllers are unified into 1 ECU. 3. Main display and ECU are independent items connected by CAN (Controller Area Network) technology.
  • Page 37 GENERAL U48-4,U55-4, WSM Three pump Load Sensing System Hydraulic operation for all actuators All actuators are hydraulically locked when the unlock lever is raised. (travel, swing, blade and AUX are also hydraulically controlled.) It realizes smoother movement with fine inching control.
  • Page 38 GENERAL U48-4,U55-4, WSM 8. QUALITY SPECIFICATIONS Machine specification : Auxiliary port1, Wrist rest, Cab, Japan STD-bucket [125 kg (277 lbs) with 2 pins 7 kg (15.5 lbs)] Factory Specification Item Remarks U48-4 U55-4 Machine size • Total length (Transport) 5330 ± 107 mm 5500 ±...
  • Page 39 GENERAL U48-4,U55-4, WSM Factory Specification Item Remarks U48-4 U55-4 Front attachment • Bucket heaped capacity SAE, JIS 0.16 ± 0.006 m 0.16 ± 0.006 m Slope angle : 1×1 0.2 ± 0.008 yd 0.2 ± 0.008 yd • Bucket struck capacity 0.11 ±...
  • Page 40 GENERAL U48-4,U55-4, WSM Factory Specification Item Remarks U48-4 U55-4 Front attachment • Max. dump height ROPS – – (Arm vertical) 1425 ± 43 mm 1825 ± 55 mm 56.1 ± 2 in. 71.9 ± 2 in. • Min. turning radius ROPS –...
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U55-4

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