Case DH4B Trencher

Serial Number Location

To identify the production year and ensure correct part matching for your Case DH4B Trencher, locate the serial number in one of the following areas:

• Stamped on the frame near the engine housing or rear axle

• On the metal ID plate affixed near the operator station or rear fender

Serial numbers vary from numeric formats to the "JAF" prefix used on later units. Use this number to verify engine, transmission, and digging system compatibility.

Serial Number Reference by Year

Key Specifications

Key Features

• ✅ Reliable Mitsubishi Engine – Fuel-efficient and designed for long working life

• ✅ Chain Trencher Tool – Ideal for trenching in agricultural and light utility settings

• ✅ Wheeled Configuration – Provides excellent maneuverability on flat or rolling terrain

• ✅ Compact Size – Easy to transport and operate in tight field or roadside environments

• ✅ Multiple Year Models Supported – Wide parts availability from early numeric to JAF serials

Common Replacement Parts

Support your Case DH4B Trencher with components from Broken Tractor:

Engine & Fuel

• Air, oil, and fuel filters for Mitsubishi 4DQ50

• Glow plugs, injectors, and cooling system components

Trencher Chain System

• Chain links, digging teeth, sprockets, and tensioners

• Hydraulic cylinders and couplers for boom lift and chain drive

Hydraulic & Controls

• Control valves, pumps, hoses, and seal kits

• Joystick or lever controls and pedal replacements

Electrical

• Wiring harnesses, ignition switches, starters, and lights

Maintenance Tips

• Oil & Filter Changes: Every 200–250 hours

• Hydraulic Filter Replacement: Every 500 hours

• Chain Inspection: Weekly or after every major job

• Trencher Teeth Check: Replace when visibly worn or dull

• Cooling System Flush: Annually