New Holland LB620, LB-620 Series Loader Backhoe Service Manual 40062010 English

Brands: New Holland / Sperry New Holland / New Holland Construction

Equipment Type: Loader Backhoe

Manuals Type: Service Manual

Machine Model & Serial Number: LB-620

Region: N/R

Book Code: 40062010

Issued: Reprinted Edition

Language: English

Pages: 135

File Format: Portable Document Format (PDF)

Remark: The definitive factory service manual for the New Holland LB-620 loader backhoe. This 135-page guide provides nuclear-level technical depth for machine maintenance and overhaul. Includes comprehensive internal service protocols for the Sundstrand hydrostatic drivetrain and Dana 70 HD axles. Features surgical disassembly and reassembly instructions for all major hydraulic cylinders, control valves (Kontac, Gresen, Victor Dukes), and the Ross steering motor. Complete with full electrical and hydraulic circuit diagrams for professional-grade diagnostics.

Table of contents

• SECTION 0 - SAFETY AND INTRODUCTION
  • Machine Identification
  • Safety Instructions
• SECTION 1 - BRAKES
  • Parking Brake
    • Caliper and Linkage Adjustment
    • Pad Removal and Installation
  • Foot Brake
    • Master Cylinder Overhaul
    • System Bleeding
  • Hydraulic Brake Caliper
    • Removal
    • Disassembly
    • Inspection
    • Reassembly
    • Installation
  • Brake Disc Replacement
• SECTION 2 - HYDRAULIC CYLINDERS
  • Backhoe Bucket and Stabilizer Cylinders
    • Removal
    • Disassembly
    • Inspection
    • Reassembly
    • Installation
  • Boom Cylinder
    • Disassembly and Reassembly Protocols
  • Crowd or Dipper Cylinder
  • Extendable Dipper Shimming
  • Swing Cylinder and Steering Cylinder
    • Overhaul Procedures
  • Loader and Loader Bucket Cylinder
• SECTION 3 - ELECTRICAL SYSTEM
  • Alternator Troubleshooting and Removal
  • Starter Motor Overhaul
  • Labor Guide
  • Wiring Diagrams
• SECTION 4 - ENGINE SPECIFICATIONS
• SECTION 5 - FINAL DRIVES
  • Axle Assembly Removal and Installation
  • Dana 70 HD Axle Service
• SECTION 6 - TRANSFER GEARBOX
  • Removal
  • Disassembly
  • Inspection of Parts
  • Reassembly
  • Installation
• SECTION 7 - HYDRAULIC SYSTEM
  • Component Identification
  • Hydraulic Oil Flow Analysis
  • Master Troubleshooting Chart
• SECTION 8 - HYDROSTATIC PUMP AND MOTOR
  • Removal
  • Disassembly (Sundstrand Series 18)
  • Internal Inspection
  • Reassembly
  • Start-up Procedures and Testing
• SECTION 9 - STEERING MOTOR
  • Ross Hydraguide HGB Service
  • Seal Replacement
  • Internal Overhaul
• SECTION 10 - HYDRAULIC PUMP
  • Cessna Gear Pump Removal
  • Sectional Disassembly and Reassembly
• SECTION 11 - VALVES
  • Backhoe Valve Stack (Kontac, Gresen, Victor Dukes)
  • Loader Boom and Bucket Control Valve
  • Stabilizer Lock Valve Overhaul
  • Steering System Relief Valve Service
• SECTION 12 - ADJUSTMENTS
  • Back-Up Alarm
  • Foot Brake and Parking Brake Linkage
  • Hydrostatic Neutral Calibration
  • Loader Valve Control Cables
  • Neutral Safety Switch
  • Pedal Height Adjustment

Professional Surgical Insight
When rebuilding LB-620 hydraulic cylinders, pay close attention to the piston nut torque values; boom cylinders require 660 ft. lbs. while stabilizer cylinders require 320 ft. lbs. For the hydrostatic system, cleanliness is critical when servicing the Sundstrand Series 18 components—always flush the system after a major pump failure. When adjusting the parking brake, ensure the knurled handle provides a positive "snap" when locking in the over-center position to prevent roll-away. Always use the specified DOT 3 fluid for the brake master cylinder to avoid seal swelling.