CASE FUNK DF-154 / DF-254 Direct Drive Transmission Troubleshooting Manual PDF | Diagnostic & Calibration Guide

The CASE FUNK Transmission Troubleshooting Manual PDF provides complete factory diagnostic procedures for FUNK DF-154 and DF-254 direct drive transmissions used in CASE 845B, 865B, and 885B graders.
It details the electro-hydraulic system, TCU diagnostic flow, pressure test points, and clutch modulation sequences, along with full tables for troubleshooting transmission faults and calibration issues.

This manual is indispensable for technicians performing advanced fault analysis, transmission calibration, and control diagnostics using CASE EST (Electronic Service Tool).

Technical Highlights

• Models covered: FUNK DF-154 / DF-254 Direct Drive Transmissions

• Vehicles: CASE 845B DHP, 865B VHP, 885B Graders

• Diagnostic coverage: electrical, hydraulic, and mechanical subsystems

• Detailed clutch sequence logic and pressure test specifications

• Comprehensive TCU error code list and calibration procedure

• “Come Home” system operation and fail-safe conditions

• Hydraulic flow chart and test port location diagrams

• Temperature and oil pressure thresholds for service testing

• Electrical sensor and solenoid continuity checks

Table of Content

• 1. Overview & System Description

• 2. Transmission Control Unit (TCU) Diagnostics

• 3. Error Codes & Fault Conditions

• 4. Pressure Testing & Calibration

• 5. Solenoid & Sensor Test Procedures

• 6. Hydraulic Circuit Diagrams

• 7. “Come Home” Operation Mode

• 8. Troubleshooting Charts

  • No Forward / Reverse engagement

  • Harsh shifting or delayed clutching

  • Temperature and pressure imbalance faults

  • Electrical continuity or sensor feedback failures

File Information

• Manufacturer: CASE Construction / FUNK Drivetrain

• Applicable Machines: CASE 845B, 865B, 885B Graders

• Transmission Models: FUNK DF-154 / DF-254

• Language: English

• Pages: 44

• Format: PDF

• Category: Technical Troubleshooting & Calibration

Delivery

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