Description:

Serial Number Location:

For Case 780B models (manufactured from the mid-1970s through early 1980s), the serial number plate is typically located on the left side of the tractor frame, behind the loader arm or near the bell housing just below the operator’s platform. Always verify the serial number before ordering parts, as hydraulic and engine updates were introduced during production.

Case 780B Serial Numbers by Year

• 1981: #9145061 – 9146250

• 1982: #9146251 – 9151350

• 1983: #9151351 – 9151400

• 1984: #9151401 – 9158100

• 1985: #9158101 – 9161325

• 1986: #9161326+

Key Specifications

Years Manufactured: 1981-1986

Engine Model: Case 336BDT 4-cylinder turbo diesel

Net Horsepower: 74 HP @ 2,100 rpm

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

Hydraulic Flow Rate: Approx. 25 – 28 gal/min

Hydraulic Pressure: 2,000 – 2,200 psi

Operating Weight: Approx. 14,000 – 15,000 lbs

Backhoe Dig Depth: Up to 16 ft (with 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

Powerful Loader Design: Known for its exceptional loader breakout force, the 780B was used for roadwork, utility trenching, and site prep where high lifting capacity was critical.

Extendahoe Option: Optional extendable dipper stick adds up to 4 extra feet of dig depth without repositioning.

Responsive Hydraulics: Twin pump hydraulic system offers good response time for both loader and backhoe controls.

Operator Layout: Open ROPS canopy with dual mechanical control levers and high-mounted backhoe controls for improved visibility.

Durable Frame & Arms: Heavy-duty loader arms and reinforced boom allow for long-term use in rough environments.

Routine Maintenance

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

• Transmission Oil & Filter: Change every 500 hours

• Hydraulic Fluid & Filters: Replace every 500 hours

• Fuel Filters: Replace every 250 hours

• Air Filters: Inspect weekly; replace when restricted

• Backhoe and Loader Grease Points: Lubricate daily

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

Common Issues & Fixes

Loader Arms Slow or Weak: Worn hydraulic pump or clogged return filter—replace pump or clean filter and verify pressure.

Transmission Slipping: Caused by worn clutch plates or low shuttle pressure—rebuild shuttle valve or replace clutch discs.

Backhoe Drift or Swing Lag: Worn swing cylinder seals or valve spool leaks—install new seal kits and inspect spool function.

Hard Cold Starts: Likely due to glow plug failure or air in fuel system—test glow plugs and bleed fuel lines.

Brake Pedal Goes Soft: Mechanical brakes may require adjustment or shoe replacement—inspect cams and pivot pins.

Loose Boom Pivot or Swing Pins: Grease daily and replace worn bushings or bolts to prevent frame damage.