Part of the New Holland Repair Manuals.
When the hydrostatic drive on your L-555 starts creeping in neutral, the New Holland L-555 service manual PDF (OEM 40055510), the factory book covering the L-550 Series, puts the fix on the bench: 116 factory pages that take the tandem piston pumps, drive motors, and chain-case final drive down to parts and build them back to spec. Hydraulic schematics map the charge circuit, loader valve, and relief plumbing, while wiring diagrams trace the starter circuit and the seat-activated boom lockout that keeps killing your lift circuit. A dedicated troubleshooting section walks service problem evaluation before you spend money on parts. Bench-test the gear pump against its rated 14 GPM at 2800 RPM, and verify boom relief at 2750 psi before you condemn a slow cylinder. Nobody answers the phone when the loader quits at 6 a.m., but this book does. Print the pages you need and let them get greasy; the bookmarked, keyword-searchable file stays clean.
What's Inside This New Holland L-555 Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 2-3 | Service Manual, Operator's Manual, Engine Repair, Safety Instructions, Parts Ordering |
| Safety | 4-6 | Personal Safety |
| Operation | 7-10 | Hydrostatic Drive, Tandem Pump Configuration, Variable Displacement Piston Pumps, Gear Pump, Steering Control Levers, Neutralizers |
| Steering Adjustments | 11-12 | Drive Control Adjustment, Neutralizer, Neutralizer Tube Assembly, Creep Adjustment, Control Arm Yokes, Control Arm Stop Bolts |
| Hydrostatic Transmission Removal | 13-18 | Hydrostatic Pump Removal, Hydrostatic Motor Removal |
| Hydrostatic Pump Overhaul | 19-30 | Disassembly, Inspection of Parts, System Cleaning Procedure |
| Hydrostatic Transmission Motors | 31-46 | Disassembly, Parts Inspection, Reassembly of Hydrostatic Motor |
| Gear Pump | 47-52 | Gear Pump Removal, Gear Pump Disassembly, Parts Inspection |
| Boom and Bucket Cylinders | 53-56 | Cylinder Removal, Inspection |
| Control Valve | 57-64 | Servicing the Control Valve, Control Valve Removal, Spools and O-Rings |
| Final Drive | 65-84 | Chain and Gear-Sprocket Drive Disassembly, Front Axle Disassembly, Final Drive Reassembly |
| Electrical System | 85-94 | Starter Removal and Replacement |
| Seat Activated Boom Lockout | 95-98 | Boom Lift Circuit, Electronic Solenoid, Seat Switch, Interlock Operation |
| Troubleshooting | 99-102 | Service Problem Evaluation |
| Specifications | 103-112 | Engine, Electrical System, Hydrostatic Transmissions, Hydraulic System, Cylinders, Travel Speeds |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Gear pump capacity | 14 GPM (52.9 LPM) at 2800 RPM | p. 47 |
| Master relief valve pressure | 1,875 psi (129 bar) | p. 9 |
| Charge line filter bypass pressure | 150 psi (10.35 bar) | p. 9 |
| Boom relief valve pressure | 2750 psi (190 bar) | p. 9 |
| Pump housings to valve plate bolts | 27-31 ft. lbs. (37-42 N·m) | p. 28 |
| Hydrostatic pump coupler bolts | 55-60 ft. lbs. (74-81 N·m) | p. 28 |
| Drive shaft rolling torque after assembly | 5 ft. lbs. (7 N·m) maximum | p. 31 |
| Main system relief valve factory setting | 1,875 psi (129 bar) | p. 58 |
| System pressure range at 120°F (49°C) | 2,050-2,400 psi (141-166 bar) | p. 58 |
| Main system relief pressure | 2000 to 2300 psi | p. 104 |
| Transmission Relief Valve Pressure | 3000 psi | p. 9 |
| Hydrostatic Pump to Engine Bolt Torque | 40-45 ft. lbs. | p. 13 |
