Ford New Holland 755, 755A, 755B Tractor Loader Backhoe Service Manual 40075510 English

Brands: Ford / Ford New Holland / New Holland Construction

Equipment Type: Tractor Loader Backhoe

Manuals Type: Service Manual

Machine Model & Serial Number: 755, 755A, 755B

Region: N/R

Book Code: 40075510 (SE3905)

Issued: Reprinted (Includes 1982, 1983 updates)

Language: English

Pages: 476

File Format: Portable Document Format (PDF)

Remark: Massive 476-page definitive factory service manual for the Ford 755 series Tractor Loader Backhoes. Nuclear Level Detail: Contains complete internal engine overhaul procedures for the 4-cylinder turbocharged diesel engines, including precision specifications for cylinder block reconditioning, connecting rod alignment, and crankshaft regrinding. Features exhaustive diagnostics and reconstruction for the 3-speed Power Reversing Transmission, multi-disc wet brakes, and the complete 44 GPM dual-element hydraulic system. Includes the 755B production changes supplement covering halogen lighting, new neutral lock shift mechanisms, and reversible stabilizer pads.

Table of contents

• PART 1: ENGINES
  • Chapter 1: Engines and Lubrication System
    • 1. Description and Operation (4-Cylinder Turbocharged Diesel)
    • 2. Cylinder Head, Valves, and Related Parts (Overhead Valve Design)
    • 3. Engine Front Cover and Timing Gears (Synchronization Marks)
    • 4. Oil Pan Sump and Oil Pump (Rotor-type Pressure System)
    • 5. Internal Engine Overhaul: Connecting Rods, Bearings, Pistons, Rings, and Cylinder Block Reconditioning
    • 6. Balancer, Main Bearings, Flywheel, and Crankshaft (Dynamic Balancer Housing Rebuild)
    • 7. Camshaft (Five-Bearing Support and End Play Checks)
  • Chapter 2: Turbochargers
    • Air Research (Bolted Construction Type) Overhaul
    • Schwitzer (V-Band Clamp Type) Overhaul
    • Diagnosis and Troubleshooting (Radial and Axial Clearance Checks)
  • Chapter 3: Cooling System (Radiator, Thermostat, and Water Pump Rebuild)
  • Chapter 4: Troubleshooting, Specifications, and Special Tools (Torque Values)
• PART 2: FUEL SYSTEM
  • Chapter 1: Diesel Fuel System (In-line Injection Pump with Mechanical Governor)
  • Chapter 2: Injectors (Pintle Type Testing, Pop-off Pressures, and Overhaul)
  • Chapter 3: Troubleshooting, Specifications, and Special Tools
• PART 3: ELECTRICAL SYSTEM
  • Chapter 1: Wiring, Lights, and Instruments (Full Schematics)
  • Chapter 2: Battery (Testing, Charging, and Specific Gravity)
  • Chapter 3: Alternator Charging System (Motorola Transistorized Regulator Tests)
  • Chapter 4: Starting System (5-inch Positive Engagement Drive Motor Overhaul)
  • Chapter 5: Troubleshooting, Specifications, and Special Tools
• PART 4: TRANSMISSION
  • Chapter 1: Servicing the Transmission
    • Torque Converter Overhaul (Impeller, Turbine, and Reaction Member)
    • Power Shift Transmission Rebuild (5-Clutch Pack Configuration)
    • Filter, Transmission Pump, and Regulator Valve Assembly
    • Control Valve Overhaul (Directional, Dump, and Speed Spools)
    • Power Flow Logic (Forward/Reverse and 1st-3rd Speeds)
  • Chapter 2: Tests, Troubleshooting, and Hydraulic Pressure Calibration
• PART 5: REAR AXLE AND BRAKES
  • Chapter 1: Rear Axle and Brakes
    • Planetary Final Reduction Gear Reconstruction
    • Differential and Differential Lock Assembly Overhaul
    • Wet Disc Foot Brakes and Transmission Parking Brake Service
    • Drive Pinion Bearing Pre-load (Pull Scale Calibration)
  • Chapter 2: Specifications and Special Tools
• PART 6: STEERING AND FRONT AXLE
  • Chapter 1: Steering (Hydrostatic Steering Motor and Gear Pump Overhaul)
  • Chapter 2: Front Axle (Fabricated Box Beam and Spindle Overhaul)
  • Chapter 3: Troubleshooting, Specifications, and Special Tools
• PART 7: WHEELS AND TIRES (Torque Sequence and Ballast Specs)
• PART 8: COMPONENT REMOVAL (Tractor Splitting and Engine Removal)
• PART 9: LOADER, BACKHOE AND HYDRAULICS
  • Chapter 1: Description and Operation (Loader-Backhoe Structural Members)
  • Chapter 2: Component Overhaul
    • Cylinders: Lift, Crowd, Bucket, Swing, and Stabilizer Rebuild
    • Valves: Lift and Swing Control Valve Sectional Overhaul
    • Pump: 44 GPM Dual Gear Pump Reconstruction
  • Chapter 3: Lubrication and Maintenance Schedules
  • Chapter 4: Adjustments and Pressure Checks (System and Circuit Relief Valves)
  • Chapter 5: Troubleshooting (Circuit Isolation Tests)
  • Chapter 6: Specifications and High-Pressure Sealant Applications
• SUPPLEMENT: FORD 755B (Halogen Lighting, Neutral Lock Levers, Reversible Pads)

Professional Service Note
The Ford 755 series utilizes a highly sophisticated 44 GPM dual-element hydraulic system. When diagnosing performance issues, the isolation test (actuating crowd/lift spools with the stabilizer spool held) is critical to identifying which pump element is failing. All backhoe cylinder threaded components use Loctite Grade AV or B, and the application of heat (300°F) is required for safe disassembly without damaging the machined threads. When overhauling the Power Reversing Transmission, ensure the clutch torque calibration is accurate; the system requires a pressure of 240-270 psi for proper engagement.