Case 780CK Backhoe Loader – Parts, Specs

Description:

Serial Number Location:

For Case 780 Backhoe Loaders (including 780B and 780C variants from the 1970s through early 1980s), the serial number plate is typically located on the left side of the tractor frame, near the bell housing or below the operator’s platform. Always confirm the serial number before ordering parts, as major hydraulic and engine differences exist between the B and C models.

Key Specifications

Years Manufactured: 1970s – Early 1980s (depending on variant)

Engine Model:

• Case 780CK: Case 336BDT (diesel, 4-cylinder)

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Net Horsepower:

• 780CK: Approx. 74 HP @ 2,100 rpm

Transmission Type: 4-speed power shuttle or torque converter with mechanical shuttle

Hydraulic Flow Rate: 25 – 35 gal/min (varies by model and pump configuration)

Hydraulic Pressure: Approx. 2,000 – 2,500 psi

Backhoe Dig Depth: Up to 17 ft (extendahoe)

Loader Bucket Capacity: 1.25 – 1.5 cubic yards

Top Travel Speed: Up to 22 mph

Dimensions (L×W×H): Approx. 23 ft × 7.5 ft × 11 ft

Performance & Design Highlights

Heavy-Duty Loader Power: One of the most powerful loader/backhoes in its class at the time, the 780 offered industry-leading breakout force and lift capacity for larger earthmoving tasks.

Extendable Dipper (Optional): Extendahoe-equipped models provide deeper reach without repositioning the machine—ideal for trenching and utility installs.

Hydraulic Versatility: Multiple pump designs and higher flow rates make the 780 highly responsive for both loader and backhoe operations.

Comfort-Oriented Operator Station: Open ROPS platform with mechanical lever controls and ample legroom—basic but effective.

Durable Frame & Loader Arms: Rugged steel construction with reinforced loader linkage and integrated counterweights to handle heavy digging.

Routine Maintenance

• Engine Oil & Filter: Change every 100–200 hours

• Hydraulic Fluid & Filters: Change every 500 hours

• Transmission Fluid: Replace every 500 hours

• Fuel Filters: Replace every 250 hours

• Air Filters: Inspect weekly; replace when restricted

• Backhoe and Loader Pins: Grease daily to prevent bushing wear

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

Common Issues & Fixes

Loader Lift Sluggish or Stalls Under Load: Check for low hydraulic fluid or worn hydraulic pump—replace pump or install new pump seals.

Transmission Not Engaging Properly: May be due to worn shuttle clutch packs or faulty valve body—inspect and rebuild if slipping in forward or reverse.

Hydraulic Cylinder Leaks: Replace rod seals and piston seals using rebuild kits compatible with loader or backhoe cylinders.

Engine Overheating: Clogged radiator fins or worn fan belts—clean and replace as needed; verify thermostat operation.

Backhoe Swing Lag: Worn swing cylinder bushings or leaky valve body—inspect and replace bushing kits or reseal spool valves.

Brake Fade on Slopes: Mechanical drum brakes may need adjustment or shoe replacement—inspect cam levers and clean adjusters.