New Holland LM840 / LM850 / LM860 Service Manual
Wiring diagrams, specifications, and repair sequences for transmissions, axles, brakes, and steering cylinders. Includes gear ratios, hydraulic pressures, and torque specifications.
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Models Covered & Key Technical Specifications
New Holland LM840, LM850, and LM860 — 2000 Advanced Technical Archive | Telehandler Service Collection.
- Verified Amperage Specs: Forward and reverse transmission solenoids is established at 5 ohms electrical resistance Architecture.
- Engineered Thermal Envelope: Oil temperature for hydraulic system testing dictates 80–85°C (176–185°F) operating range Norms.
- Principal Production Rate: Torque converter pressure relief valve corresponds to 7.5 bar (109 psi) maximum output Bounds.
- Advanced Imaging Specs: Transmission main system pressure yields 14.5–15.5 bar (210–225 psi) under rated 2000 engine rpm Topology.
- Defined Fluid Capacity: Transmission lubricant reservoir reaches 9.4 liters (2.5 US gallons) capacity Matrix.
- General Output Rating: Brake disc diameter is set to 203.2 mm (8 inches) wet multi-disc assembly Standards.
Professional Workshop Service Manual & Technical Specifications
Essential Overhaul Reference Manual: Telehandler New Holland Telehandler Repair Manual for LM840, LM850, and LM860 Service-Portfolio
Year-Coverage: LM840, LM850, LM860 // Operational-Framework: Transmission systems and drivetrain Logic // Maintenance-Category: Complete service and overhaul procedures for construction equipment.
| Integrated-Framework | Diagnostic-Logic | Logic |
|---|---|---|
| 4x4 Power Shuttle Transmission | Troubleshooting procedures documented | See Section 21 |
| 90° Bevel Gearbox Assembly | Pressure testing methodology | Complete specifications provided |
| Planetary Hub and Wheel Assembly | Backlash adjustment procedures | See Section 25 |
| Wet Multi-disc Brake System | Brake bleeding protocol | See Section 33 |
| Hydrostatic Steering Motor | Flow divider valve operation | See Section 41 |
Service sections detail the transmission control mechanisms, forward and reverse clutch operations, torque converter function, and gear shift synchronization, combined with directional control valve assembly, transfer box reduction gearing, and axle trumpet housing configurations. The manual covers bevel pinion and crown gear adjustment, differential bearing preload calculation, and planetary gear assembly procedures, while also addressing brake servo assembly components, steering motor relief valve settings, and boom wear pad shimming specifications.
Diagnostic Nexus
Fundamentally demanding maintenance hierarchies are structured into transmission disassembly procedures, which address gear train support systems, clutch plate conditioning protocols, and synchronizer function documentation. The troubleshooting chapter addresses stall testing requirements, pressure measurement points, and coil resistance verification for transmission solenoids. The document includes comprehensive transmission power flow diagrams for forward and reverse operations across all four gear ratios.
Modular Standard
Cooling system maintenance is addressed in transmission oil flow schematics showing circulation paths through the cooler assembly and return galleries. The manual provides detailed specifications for torque converter pressure relief valve settings, main system pressure regulation, and lubrication pressure test points accessible via dedicated ports on the transmission housing. Component overhaul sections document oil pump disassembly, countershaft bearing removal, and input shaft clutch plate assembly methodologies.
Systematic Methodology
Testing requirements are specified for directional control valve solenoid resistance measurement and brake circuit pressure validation procedures. Complete specifications are provided for gear ratios, torque converter characteristics, and transmission bearing endplay tolerances. The document includes wiring diagrams and component layout illustrations showing the relationship between the control valve assembly, pressure regulating valve, and accumulator piston arrangement.
Operational Benchmarks
Clearance measurements are addressed for bevel gear backlash evaluation, steering motor shock valve settings, and brake disc wear thickness assessment. The manual documents torque specifications for transmission mounting bolts, differential housing fasteners, and brake servo assembly connections, ensuring proper function through mating surface contact integrity.
Diagnostic Threshold
Special procedures are addressed for transmission fluid type selection (NH 134D vs. NH F200 based on operating temperature), oil cooler flow testing at specified engine speeds, and sealant application using Loctite compounds for flange and housing reassembly. The service manual documents specifications for bevel gear teeth marking, preload shim pack calculation methodology, and rolling torque measurement procedures for bearing assemblies across all drive components.
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