Description:

Serial Number Location:

For Case 780C models (produced in the early to mid-1980s), the serial number plate is typically located on the left side of the machine, near the loader frame below the operator’s platform or close to the bell housing. Always confirm the serial number when ordering parts, especially to differentiate from earlier 780B models due to changes in the engine, hydraulics, and drive components.

Case 780C Serial Numbers by Year

• 1984: #9154233 – 9158100

• 1985: #9158101 – 9161325

• 1986: #9161326 – 17736499

• 1987: #17736500 – JJG0071499

• 1988: #JJG0071500+

Key Specifications

Years Manufactured: 1984-1988

Engine Model: Case Cummins 6-590, 6-cylinder diesel (naturally aspirated)

Net Horsepower: 105 HP @ 2,200 rpm

Transmission Type:  Clark torque converter drive with Powershift Transmission

Hydraulic Flow Rate: Approx. 30 – 35 gal/min

Hydraulic Pressure: Up to 2,500 psi

Operating Weight: Approx. 18,500 – 19,500 lbs

Backhoe Dig Depth: Up to 17 ft with Extendahoe option

Loader Bucket Capacity: 1.5 – 1.75 cubic yards

Top Travel Speed: Up to 22 mph

Dimensions (L×W×H): Approx. 23.5 ft × 8 ft × 11.2 ft

Performance & Design Highlights

Increased Power and Capacity: The 504BD engine gave the 780C significantly more digging and lifting strength than previous models—ideal for roadbuilding and heavy-duty trenching.

Robust Hydraulics: Larger capacity pump with quicker cycle times for both loader and backhoe operations; increased pressure for stronger breakout force.

Heavy-Duty Loader Arms: Reinforced loader frame and thicker linkage arms reduce flex under load, increasing component longevity.

Extendahoe Compatibility: Standard on many models, the extendable dipper stick improves reach and digging depth without repositioning.

Enhanced Operator Station: Larger ROPS frame with improved seat, clear visibility, and better control layout compared to earlier generations.

Routine Maintenance

• Engine Oil & Filter: Replace every 200 hours

• Transmission Oil & Filter: Change every 500 hours

• Hydraulic Fluid & Filters: Replace every 500 hours

• Fuel Filters: Replace every 250 hours

• Air Filters: Inspect every 100 hours; replace when dirty

• Cooling System: Flush every 1,000 hours or annually

• Grease Points: Lubricate loader and backhoe pivots daily

Common Issues & Fixes

Loader Lift Lag: Often due to a worn hydraulic pump or clogged suction strainer—check flow output and clean or replace as needed.

Transmission Jerking or Delay: Could be low pressure in the power shuttle system or worn torque converter—perform pressure test and inspect solenoids.

Hydraulic Cylinder Leaks: Replace rod seals and install rebuild kits on the backhoe or loader arms.

Swing Arm Lag or Jerkiness: Check for air in hydraulic lines or worn swing control valve—bleed system and rebuild valve if necessary.

Overheating During Heavy Use: Ensure radiator is clean and fan belts are tight—inspect thermostat and water pump if overheating persists.

Starter Drag or No-Crank: Check grounding wires and battery terminals—replace starter relay or solenoid if voltage drop is present.