CASE FUNK DF-154 / DF-254 Direct Drive Transmission – Grader Series B Technical Training Manual PDF

The CASE FUNK Direct Drive Transmission Technical Training Manual provides complete service and diagnostic coverage for DF-154 and DF-254 transmissions used in CASE Series B graders (845B DHP, 865B VHP, 885B).
It explains full component identification, torque and pressure specifications, electrical system integration, TCU calibration, and hydraulic circuit operation.
Ideal for technicians, mechanics, and training institutions specializing in electro-hydraulic powertrain systems.

Technical Highlights

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

• Vehicles covered: CASE 845B, 865B, 885B graders

• Type: Direct drive – 8 forward / 4 reverse gears

• Control: Fully modulated oil-cooled multi-disc clutches

• Diagnostics: TCU software calibration + error monitoring

• Temperature: 65–93 °C normal / 121 °C max

• Pump flow: 87–102 L/min @ 2000 RPM

• Pressure range: 255–285 psi (test speed 2000 RPM)

• Tools: Electronic Service Tool (EST) & Calibration plug X36

Table of Content

• Overview & General Information

  • DF 154 / 254 models and mounting specifications

  • Operating temperatures and hydraulic pressure ranges

• Component Identification

  • Direct drive shaft • Charge pump • Front / rear housing • Sensors • Dipstick assembly

• Electrical and Control Systems

  • Engine and transmission coupling

  • Electrical system layout (gear indicator, TCU, inching pedal, come-home switch)

• Transmission Control Unit (TCU)

  • Logic functions • Proportional solenoids • Calibration and fault modes

• Sensors and Actuators

  • Engine speed • Cylinder MPU • Output RPM sensor • Temperature sensor

• Safety and Protection Systems

  • Come-home system • Inching pedal • Parking brake • Transient Voltage Protection

• Hydraulic and Lubrication Circuits

  • Charge pump • Main relief • Proportional valves • Oil flow diagram

• Clutch Operation and Calibration

  • Gear logic (1st–8th FWD / 1st–4th REV) • Calibration procedure (X36 + X37 jumpers)

• Diagnostics and Software Interface

  • Electronic Service Tool • Error codes • Data logging • TCU boot information

File Information

• Manufacturer: CASE Construction / FUNK Drivetrain

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

• Transmission Models: DF-154 / DF-254

• Pages: 40 slides

• Language: English

• Format: PDF

• Category: Technical Training / Transmission System

Delivery

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