LG Planetary Transmission Service Manual – Shandong Lingong PDF

Description

LG Planetary Transmission Service Manual – Shandong Lingong (SDLG) A301/A303/A305/A307/BX50 Series (PDF) DOWNLOAD

Description

🔧 Overview

The LG Planetary Transmission Service Manual provides a complete, factory-level reference for planetary gear power-shift transmissions used in SDLG construction machinery. It explains theory, structure, disassembly, assembly, and maintenance in a clear, illustrated format. This manual helps technicians understand each stage of operation and ensure quality repair and reassembly.

🧭 Contents Summary

Chapter Ⅰ – Introduction

• Safety precautions — personal protective equipment, proper lifting & torque procedures, fire prevention, use of correct tools.

• Oils & coating materials — recommended lubricants and equivalents:

  • No. 8 Hydraulic Transmission Oil (Q/SH 303 064)

  • Cross-reference with Caltex Delo Gold Multigrade 15W-40, Mobil Delvac Super 1300, Fuchs Titan Universal HD15W-40, Shell Rotella 10W.

• Marking & hoisting instructions — safety symbols, load angles, sling angles, torque tables up to M39 bolts (up to 5481 Nm).

Chapter Ⅱ – Transmission System

• Applicable models — A301, A303, A305, A307A/B, BX50-02, BX50-03.

  • Used in LG936L, LG953, LG956L, LG952H, LFT20 loaders.

• Type — planetary power gearshift with two forward gears and one reverse gear.

• Torque converter — single-stage, four-element, double-turbine, with working pressure 1.1–1.5 MPa and oil capacity 44 L.

⚙️ Sections

• Planetary gear structure & theory – detailed analysis of sun gear, carrier, and ring gear interaction.

• Gearshift principle – diagrams for reverse, 1st, and 2nd gears, including full power flow routes from engine through torque converter to output shaft.

• Overrunning clutch – explains function of dual turbine operation under varying load conditions.

• Hydraulic torque converter – working principle, impeller–turbine–stator design, energy conversion, YJSW315 double-turbine specification.

• Oil supply system – schematic and working principle for pump, filter, radiator, control valve, and torque converter circulation.

• Transmission control valve – pressure regulation, cut-off valve function, gearshift valve operation, and lubrication circuits.

Chapter Ⅲ – Disassembly & Assembly Procedures

• Required tools: hoisting equipment, torque wrench, straight edge, feeler gauge, depth gauge, and dial indicator.

• Tightening torques:

  • Input shaft to inner ring cam — 52 ± 7 Nm

  • Direct gear connecting panel bolts — 130 ± 15 Nm

  • Middle cover bolts — 145 ± 20 Nm

• Critical clearances:

  • Reverse gear friction lining to bracket: 0.9–2.8 mm

  • 1st gear friction lining to piston: 1.4–2.8 mm

  • End cover bearing to 2nd gear: 0.35–0.55 mm

• Tolerances table — inspection limits for direct/reverse gear plates and pistons with micrometer verification.

Chapter Ⅳ – Inspection Specifications

• Post-assembly inspection procedures for:

  • Bearing axial clearance, concentricity, and runout.

  • Clutch actuation pressure verification.

  • Leak tests on oil circuits and torque converter case.

• Comprehensive failure-judgment table for wear and tolerance excess.

🛠 Key Features

• Illustrated oil flow and power transmission diagrams.

• Step-by-step disassembly and reassembly sequences.

• Hydraulic and torque data for YJSW315 torque converter.

• Gearshift and pressure calibration details for A301–BX50 models.

• Factory torque and clearance charts for accurate reassembly.

📄 File Details

💡 Why This Manual Is Valuable

• Includes factory calibration specs and clearances not found in operator manuals.

• Saves repair time with step-by-step illustrations and verified torque data.

• Ensures safe assembly and extended lifespan of transmission components.

• Essential for SDLG loader transmission overhaul, troubleshooting, and training.

File Details