Factory Takeuchi TL140 Shop Manual for Crawler Loaders

Takeuchi TL140 Workshop Manual - 2005 Edition

Takeuchi TL140 Workshop Manual CT9E001 provides critical repair and diagnostic procedures for the TL140 Crawler Loader series. System integrity is maintained through a mandatory air-purging sequence for the Hydrostatic Transmission (HST) pump following any hydraulic service, which prevents cavitation and immediate component failure.

Technical Applicability & Serial Ranges

• Takeuchi TL140 Crawler Loader (Initial Production)
  • Chassis Series: 21400011 through 21402000
  • Features: Original travel motor configuration (Model TH06VB) and standard hydraulic integration.
• Takeuchi TL140 Crawler Loader (Current Generation)
  • Chassis Series: 21402001 and upward
  • Features: Updated high-capacity travel motor (Model BMVT41B) and revised planetary reduction gear ratios.

Operational Performance & Safety Benchmarks

• Hydraulic System Accuracy: Precision-tuned main relief valves set at 20.6 MPa ensure consistent breakout forces during heavy lifting.
• Service Standard Compliance: Specific allowable wear values for track rollers (208 mm limit) and drive sprockets (402 mm limit) guarantee optimal machine uptime.
• Diagnostics Accuracy: Integrated pressure detection ports allow for real-time monitoring of charge, pilot, and travel circuit pressures.

Document Metadata

• Print Number: CT9E001
• Total Pages: 302 Pages
• Technical Revision: Rev. 1

Technical Depth & Factory Benchmarks

• Hydrostatic Drive Parameters: HST relief valve pressure is factory-set at 34.5 MPa to manage maximum torque loads.
• Propulsion Speed Standards: Travel speed is calibrated for 7.3 km/h in 1st speed and 10.4 km/h in 2nd speed at rated RPM.
• Cycle Time Specifications: Lift arm raising time is benchmarked at 4.3 seconds under full load conditions.
• Hydraulic Pilot Pressure: Secondary side pilot pressure ranges from 0.49 to 1.96 MPa for proportional control responsiveness.

Visual Navigation Aids

• Component Architecture Diagrams: Exploded views of the Isuzu AA-4JG1T engine and HST pump assembly for precise part location.
• Circuitry Schematics: Full-page hydraulic circuit diagrams detailing the flow from the tandem gear pumps to the three-circuit control valve.
• Electrical Wiring Logic: Detailed harness maps including fuse box locations and relay unit assignments for the safety and lever-lock systems.

Table of Contents

• I. General: Safety precautions, tightening torques, and disassembly cautions.
• II. Specifications: Machine dimensions, mass tables, and service standards.
• III. Machine Configuration: Drive system, travel system, frame, and attachments.
• IV. Hydraulic Units: HST pump, gear pump, control valves, and travel motor.
• V. Troubleshooting: Diagnostic logic for machine travel and lift arm failures.
• VI. Engine: Detailed maintenance for the Isuzu AA-4JG1T power plant.

Operational Limits & Specifications

• Fluid Capacities: Fuel Tank (90 L), Hydraulic Tank (52 L), Engine Oil Pan (9.6 L).
• Lubricant Standards: Diesel engine oil API CD SAE 10W-30 for hydraulic systems; API GL-4 SAE 90 for reduction gears.
• Critical Torque Sequences: Piston nuts must be secured to 680 N·m; track roller A installation bolts require 241 N·m with thread-locking compound.
• Temperature Constraints: Standard hydraulic performance testing is conducted at an oil temperature of 50–60°C.