Case 660 Trencher – Specs, Parts & Maintenance Guide

Description:

The Case 660 Trencher is a powerful, high-performance ride-on trencher built for serious underground utility work. Designed for tough soil conditions and extended trenching operations, the 660 is a step above the 560, offering increased digging depth, hydraulic output, and optional attachments like backhoes and vibratory plows.

With a durable Deutz air-cooled diesel engine, heavy-duty chain boom, and operator-friendly hydraulic controls, the Case 660 delivers deep trenching capacity and maximum torque for fiber optic, gas, water, and sewer installation crews. It remains a popular choice among contractors who value reliability and straightforward maintenance in the field.

Specifications

Engine:

• Manufacturer: Deutz

• Model: F3L1011 or F3L912 (model dependent)

• Type: 3-cylinder, air-cooled diesel

• Horsepower: 65–70 hp

• Cooling System: Air-cooled

• Fuel Tank Capacity: Approx. 12–15 gallons

Trenching System:

• Max Trench Depth: Up to 72 inches

• Trench Widths: 6 to 18 inches (customizable chain options)

• Chain Boom: Heavy-duty, bolt-on teeth

• Auger: Included standard

• Hydraulic Side-Shift: Yes, allows offset trenching near walls or structures

• Optional Rear Attachments: Vibratory plow, backhoe

Transmission & Drive:

• Hydrostatic drive

• 2WD or 4WD (select models)

• Ground Speed: 0–6.5 mph

• Drive Type: Planetary final drives

• Steering: Articulated (hydraulic)

Hydraulic System:

• Hydraulic Flow: Up to 20 GPM

• Pressure Rating: 2,800–3,000 psi

• Auxiliary Valve: Available for attachments

• Control Type: Lever-actuated hydraulic valve bank

Dimensions:

• Operating Weight: ~6,800 lbs (3,084 kg)

• Overall Length: ~155 in (3.94 m)

• Width: ~64 in (1.63 m)

• Height to ROPS: ~80 in (2.03 m)

• Wheelbase: ~60 in (1.52 m)

Maintenance Essentials

• Engine Filters (oil, fuel, air): Change every 250 hours
  Shop Case 660 Filter Kits

• Hydraulic Oil & Filters: Replace every 500 hours or after heavy use
  Find Case Trencher Hydraulic Components

• Digging Chain & Teeth: Inspect every 50 hours or sooner in rocky soil
  Buy Chain Kits and Sprockets for Case 660

• Fan Belt and Cooling Fins (Deutz Engine): Clean regularly to prevent overheating

• Grease Points: Boom pivot, auger bearings, and articulation joints require daily attention in commercial use

Common Issues and Quick Fixes

Hydraulic Slow Response or Stall Under Load:
Cause: Clogged return filter or pump wear
Fix: Replace filter, test hydraulic pressure
Get OEM Filters for Case 660

Overheating Engine (Air-Cooled):
Cause: Dirty cooling fins or failed fan
Fix: Clean fins and replace fan belt

Digging Chain Jumping:
Cause: Worn sprockets or loose tension
Fix: Re-tension chain, replace worn drive parts
Order Chain Sprockets and Tensioners

Articulated Steering Binding:
Cause: Low hydraulic pressure or worn control valve
Fix: Flush fluid, inspect steering valve, replace as needed

Serial Number Information

• Location: Serial number plate is located on the left side of the frame near the operator station or engine mount

• Tip: Serial prefixes indicate model variation (e.g., gas vs. diesel or 2WD vs. 4WD). Confirm before ordering parts.