Kubota LA1001 Workshop Manual
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Kubota LA1001 Workshop Manual

Kubota LA1001 Workshop Manual

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WORKSHOP MANUAL
FRONT LOADER
LA1001,LA1002,
LA1162,LA1251
KiSC issued 07, 2006 A

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Summary of Contents for Kubota LA1001

  • Page 1 WORKSHOP MANUAL FRONT LOADER LA1001,LA1002, LA1162,LA1251 KiSC issued 07, 2006 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 LA1001, LA1002, LA1162 and LA1251. It is divided into two parts, “Mechanism” and “Servicing” for each section. Mechanism Information on the construction and function are included.

  • Page 3: Safety First

    LA1001 · LA1002 · LA1162 · LA1251, 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 LA1001 · LA1002 · LA1162 · LA1251, WSM SAFETY INSTRUCTIONS 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.
  • Page 5 LA1001 · LA1002 · LA1162 · LA1251, WSM SAFETY INSTRUCTIONS VENTILATE WORK AREA • If the engine must be running to do some work, make sure the area is well ventilated. Never run the engine in a closed area. The exhaust gas contains poisonous carbon monoxide.

  • Page 6: Safety Decals

    LA1001 · LA1002 · LA1162 · LA1251, 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 7: Loader Terminology

    LA1001 · LA1002 · LA1162 · LA1251, WSM LOADER TERMINOLOGY LOADER TERMINOLOGY (1) Boom (4) Side Frame (7) Brace (9) Bucket Cylinder (2) Hydraulic Control Valve (5) Main Frame (8) Parallel Link (LA1162 only) (10) Bucket (3) Mounting Pin (6) Boom Cylinder...
  • Page 8 LA1001 · LA1002 · LA1162 · LA1251, WSM SPECIFICATIONS SPECIFICATIONS Suitable Tractor Loader LA1001 LA1002-57R LA1002-57C LA1002-68R LA1002-68C LA1162-68R LA1162-68C LA1251 Model M4700 M4900SU M4900 (C) M6800S M6800S (C) M6800HD (C) M6800HD (C) M8200 Tractor M5400 M4900 M5700 (C) M8200 (C)
  • Page 9 LA1001 · LA1002 · LA1162 · LA1251, WSM SPECIFICATIONS (3) Dimensional and Operational Specifications Dimensional Specifications Loader Model LA1001 LA1251 Tractor Model M4700/M5400 M6800 M8200/M9000 Maximum lift height 2895 mm (114.0 in.) 2935 mm (115.6 in.) 3390 mm (133.5 in.) Clearance with bucket dumped 2260 mm (89.0 in.)
  • Page 10 LA1001 · LA1002 · LA1162 · LA1251, WSM SPECIFICATIONS [2] LA1002, LA1162 NOTE · The LA1002 loader can be installed on all M4900, M5700 and M6800S tractor models. (Except M5700 Narrow model) · The LA1162 loader can be installed on M6800HD tractor model.
  • Page 11 LA1001 · LA1002 · LA1162 · LA1251, WSM SPECIFICATIONS (3) Dimensional and Operational Specifications a : 500 mm (19.7 in.) Dimensional Specifications Loader Model LA1002 LA1162 Tractor Model M4900DT/M5700DT (HD) M6800SDT M6800HD Maximum lift height to pivot pin 2825 mm (112.2 in.) 2900 mm (114.2 in.)

  • Page 12: Table Of Contents

    MECHANISM CONTENTS 1. FEATURES ...................... M-1 2. HYDRAULIC CIRCUIT ..................M-2 3. CONTROL VALVE ASSEMBLY..............M-3 [1] STRUCTURE ..................... M-3 [2] OPERATION ....................M-4 4. RELIEF VALVE ..................... M-10 [1] MAIN RELIEF VALVE ................M-10 [2] PORT RELIEF VALVE ................M-12 5.

  • Page 13: Features

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER 1. FEATURES 1. Huge Hoisting and Scooping Power 2. 4-Bar Link Mechanism for Greater Bucket Angle 3. Fast Cycle Time 4. One-Lever Operation 5. Heavy-Duty Bucket 6. Long Arm Reach 7.

  • Page 14: Hydraulic Circuit

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER 2. HYDRAULIC CIRCUIT [A] LA1001 with M4700, M5400, M6800 LA1002 with M4900, M5700, M6800S [B] LA1002 with M4900 CAB, M5700 CAB, M6800S CAB LA1251 [C] LA1162-68R [D] LA1162-68C (1) Bucket Cylinder...

  • Page 15: Control Valve Assembly

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER 3. CONTROL VALVE ASSEMBLY [1] STRUCTURE (1) Inlet Section P : P Port A1 : A1 Port B1 : B1 Port (2) Boom Control Valve T : T Port A2 : A2 Port...

  • Page 16: Operation

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER [2] OPERATION Neutral (1) Boom Control Valve (6) Outlet Section P : P Port B1 : B1 Port (2) Inlet Section (7) PB Passage 2 T : T Port B2 : B2 Port...
  • Page 17 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER 1. When the hydraulic control lever is set to the “UP” position, the spool (5) of the boom control valve (3) moves to the right, which forms oil passages between passage 1 (9) and B1 port, and between A1 port and PB passage 1 (7).
  • Page 18 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Down 1. When the hydraulic control lever is set to the “DOWN” position, the spool (5) moves to the left, which forms oil passages between passage 1 (9) and A1 port, and between B1 port and PB passage 1 (7).
  • Page 19 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Floating 1. When the hydraulic control lever is set to the “FLOAT” position, the spool (5) moves further to the left from the “DOWN” position and is retained by the detent mechanism (10).
  • Page 20 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Roll-back 1. When the hydraulic control lever is set to the “ROLL- BACK” position, the spool (6) of the bucket control valve (2) moves to the left, which forms oil passages between passage 2 (10) and B2 port, and between A2 port and T port.
  • Page 21 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Dump 1. When the hydraulic control lever is set to the “DUMP” position, the spool (6) of the bucket control valve (2) moves to the right, which forms oil passages between passage 2 (7), A2 port and B2 port.

  • Page 22: Relief Valve

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER 4. RELIEF VALVE [1] MAIN RELIEF VALVE The relief valve is adopted in the loader control valve of LA1002C, LA1162C and LA1251. This relief valve is pilot operated type, it is suitable for a high pressure and large volumetric flow, and has better pressure override performance than direct acting relief valves.
  • Page 23 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Relief Operation [Step 1] The relief valve is in communication between the high pressure port HP and low pressure chamber LP. Oil is admitted through the hole in piston poppet (4) and...

  • Page 24: Port Relief Valve

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Anti-cavitation Operation The anti-void unit supplies oil to the high pressure port HP when cavitation has occurred. A lower pressure exists in the port HP compared to the low pressure chamber LP.

  • Page 25: Boom Cylinder And Bucket Cylinder

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER 5. BOOM CYLINDER AND BUCKET CYLINDER (1) Nut (3) Cylinder Tube (5) Rod B : Rod O.D. (2) Piston (4) Head A : Cylinder I.D. C : Stroke Both boom cylinder and bucket cylinder consists of a head (4), cylinder tube (3), piston rod (5), piston (2), and other parts as shown in the figure above.
  • Page 26 [1] GENERAL USE SCREWS, BOLTS AND NUTS........S-8 [2] HYDRAULIC FITTINGS ................S-8 [3] TIGHTENING TORQUE FOR SPECIALLY SPECIFIED ......S-9 5. DISMOUNTING FRONT LOADER FROM TRACTOR........S-10 [1] LA1001......................S-10 [2] LA1002 AND LA1162................S-11 [3] LA1251......................S-13 6. CHECKING, DISASSEMBLING AND SERVICING........S-14 [1] CONTROL VALVE ...................S-14 (1) Checking and Adjusting ..............S-14...

  • Page 27: General

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER 1. GENERAL [1] IDENTIFICATION When contacting your local KUBOTA distributor, always specify front loader model and serial number. (1) Model / Serial Number A : LA1001 B : LA1002 C : LA1162...

  • Page 28: General Precaution

    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 29: Lubricants

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER [3] LUBRICANTS To prevent serious damage to hydraulic systems, use only specified fluid or its equivalent. Capacities M4700/M5400 M4900 (C)/ M4900/M4900SU M5700 (C)/ Place Lubricants M5700/M5700HD M5700HD (C)/ M8200/M9000 M6800/M6800S/...

  • Page 30: Check And Maintenance

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER [5] CHECK AND MAINTENANCE CAUTION • When checking and repairing, park the tractor on flat ground and apply the parking brake. • When checking and repairing, lower the bucket and stop the engine.

  • Page 31: Check Points Of Every 10 Hours

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER (2) Check Points of Every 10 Hours Greasing 1. Inject grease in all grease fittings with a hand grease gun. A : LA1001 C : LA1162 B : LA1002 D : LA1251...

  • Page 32: Troubleshooting

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER 2. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Boom Does Not Rise • Control valve malfunctioning Repair or replace S-15, S-17, S-20 • Boom cylinder defective Repair or replace S-24 •...

  • Page 33: Servicing Specifications

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER 3. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Relief Valve Setting Pressure 18.6 to 19.1 MPa – Condition LA1002C 190 to 195 kgf/cm • Engine Speed..Maximum LA1162C 2700 to 2800 psi •...

  • Page 34: Tightening Torques

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER 4. 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.

  • Page 35: Tightening Torque For Specially Specified

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER [3] TIGHTENING TORQUE FOR SPECIALLY SPECIFIED Item N·m kgf·m ft-lbs Control valve cover mounting screw 17.6 to 20.3 1.8 to 2.1 13 to 15 Control valve mounting bolt and nut 36.6 to 43.4...

  • Page 36: Dismounting Front Loader From Tractor

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER 5. 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: La1002 And La1162

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Stand 1. Remove the stands (1) from the brace. 2. Set the stand (1) to each side of boom and secure with snap pin (2). (1) Stand (2) Snap Pin...
  • Page 38 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Side Frame 1. Remove the mounting pin from the loader side frame. 2. Start the engine and run at an idle. 3. Slowly move the hydraulic control lever (1) to “ROLL-BACK”...

  • Page 39: La1251

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER [3] LA1251 Stand 1. Raise the boom until the stands (1) can be rotated. 2. Stop the engine. 3. Remove the snap pins (2) holding the stands (1) to the boom and rotate the stands (1).

  • Page 40: Checking, Disassembling And Servicing

    • Oil temperature 113 to 131 °F NOTE • The relief valve does not installed on model LA1001, LA1002R and LA1162R. However the relief valve of the tractor hydraulic system is used as the relief valve of the front loader.

  • Page 41: Control Valve Mounting Bolt And Nut 36.6 To

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Control Lever Rod and Control Valve 1. Disconnect the control lever rod (1) and (3). 2. Remove the control valve (4) from the valve plate (2). (When reassembling) • The length (A) of rod 2 (3) should be 74.4 to 75.4 mm (2.93 to 2.97 in.).
  • Page 42 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER LA1002C, LA1162C, LA1251 (CAB) Control Valve Cover and Hydraulic Hoses 1. Remove the control valve cover (2) from the valve stay. 2. Disconnect the four hydraulic hoses (1) from the control valve (3).
  • Page 43 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Cover and Cables 1. Remove the cover (1) from the valve stay (2). 2. Remove the pins (5) and disconnect the cables (4), (7) from the spools (6), (9). 3. Remove the cables (4), (7) from the valve stay (2).
  • Page 44 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Hydraulic Line Hoses and Control Valve 1. Disconnect the pump line hose (1), power beyond line hose (2) and return line hose (3) from the control valve (4). 2. Remove the control valve (4) from the valve stay.

  • Page 45: Adapter (3/8" Npt) 38 To

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Adapter and Elbow 1. Remove the nipples, adapters and elbows from the control valve. (When reassembling) • Use care not to damage the O-ring. • Use seal tape on the taper thread of fittings.

  • Page 46: Relief Valve Assembly (La1002C, La1162C, La1251) 40.0 To

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER (B) Disassembling Control Valve Separation of Section 1. Remove the relief valve (7) or (11). (If equipped) 2. Unscrew the nuts (3), and separate each section. (When reassembling) • Use care not to damage the O-rings (1), (5) and (9).
  • Page 47 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Disassembling Boom Control Valve 1. Remove the spring (12) and load check valve (11). 2. Remove the seal plate (2), wiper ring (3) and spacer (5) from the valve housing 1 (7).
  • Page 48 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER (C) Disassembling Controller (CAB Model) Controller Stand 1. Remove the controller stand assembly (1) with the cables (2) from the cabin floor. 2. Remove the controller (3) with the cables (2) from the controller stand 2 (5).

  • Page 49: Bucket, Boom And Hydraulic Cylinders

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Disassembling Controller and Cables 1. Remove the M6 lock nut (2) and cable end (1). 2. Remove the M16 lock nuts (5). 3. Disconnect the cables (3) from the controller.
  • Page 50 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Hydraulic Cylinders, Boom and Parallel Links 1. Disconnect the hydraulic hoses from the hydraulic cylinders (3), (4). 2. Remove the external snap ring and remove the indicator assembly. (If equipped) 3.
  • Page 51 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Removing Piston Rod Assembly from Cylinder 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 52 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Removing 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 53: Servicing

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER (2) Servicing Piston Rod Bend 1. Place piston rod on V blocks. 2. Set a dial indicator on the center of the rod. 3. Turn the piston rod and read the dial indicator.

  • Page 54: Side Frame, Main Frame, Brace And Others

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER [3] SIDE FRAME, MAIN FRAME, BRACE AND OTHERS (1) Disassembling and Assembling (A) LA1001 Brace and Brace Support 1. Remove the boom assembly and control valve with valve plate from the side frame (2).

  • Page 55: Main Frame Connector Mounting Screw (M16)

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Main Frame Connector and Main Frame 1. Remove the main frame connector (2) and main frames (1), (3). (When reassembling) • Do not tighten any bolts firmly until most components are attached onto the tractor.
  • Page 56 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER (B) LA1002 and LA1162 Side Frame 1. Dismount the loader assembly from loader main frame. (See page S-11.) 2. Remove the pins (1) and remove the side frames (2) from the boom assembly.
  • Page 57 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Hydraulic Hoses and Control Valve (LA1002C and LA1162C) 1. Disconnect the hydraulic hoses. 2. Disconnect the control cables from control valve. (See page S- 17.) 3. Remove the control valve with stay from main frame.

  • Page 58: Brace Mounting Screw (M16)

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Brace 1. Remove the brace (1). (When reassembling) • Do not tighten any bolts firmly until most components are attached onto the tractor. 225.3 N·m Brace mounting bolt and 23.0 kgf·m...

  • Page 59: Main Frame Connector Mounting Screw (M16)

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Side Frame Connector and Main Frame Connector 1. Remove the side frame connector (1). 2. Remove the connector (2). (When reassembling) • Do not tighten any bolts firmly until most components are attached onto the tractor.

  • Page 60: Main Frame Mounting Screw (M16)

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Main Frame 1. Remove the main frame LH (1), RH (2). (When reassembling) • Do not tighten any bolts firmly until most components are attached onto the tractor. 225.3 N·m Main frame mounting 23 kgf·m...
  • Page 61 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Hydraulic Hoses and Control Valve Assembly 1. Disconnect the hydraulic hoses. 2. Disconnect the control cables from control valve (CAB model). (See page S-17.) 3. Remove the control valve with stay from main frame.
  • Page 62 LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Water Separator and Wind Guards 1. Remove the water separator (1) and wind guard RH (2) from the main frame RH. 2. Remove the wind guard LH (3) from the main frame LH.

  • Page 63: Main Frame Mounting Screw (M18)

    LA1001 · LA1002 · LA1162 · LA1251, WSM FRONT LOADER Brace and Brace Support 1. Remove the brace (1) and brace support (2). (When reassembling) • Do not tighten any bolts firmly until most components are attached onto the tractor.
  • Page 64 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 2002. 02, S, EI, EI, e Code No.9Y011-12214 KUBOTA Corporation         ...

This manual is also suitable for:

La1002La1162La1251La1002-57rLa1002-57cLa1002-68r ... Show all

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