Description:

Serial Number Location:

For Case 780D models (produced from the mid-1980s through the early 1990s), the serial number plate is typically located on the left side of the machine frame, just behind the loader lift cylinder or beneath the operator’s platform near the clutch housing. Always confirm the serial number when ordering parts, as updates to hydraulics, cab configuration, and emissions occurred throughout production.

Case 780D Serial Numbers by Year

• 1988: #JJG0071500 – JJG0071699

• 1989: #JJG0071700 – JJG0071740

• 1990: #JJG0071741 – JJG0071825

• 1991: #JJG0071826 – JJG0071898

• 1992: #JJG0071899+

Key Specifications

Years Manufactured: Mid-1980s – Early 1990s

Engine Model: Case 504BDT, 6-cylinder turbocharged diesel

Net Horsepower: 110 HP @ 2,200 rpm

Displacement: 504 cu in (8.3 L)

Transmission Type: Power shuttle or torque converter drive, 4-speed forward/reverse

Hydraulic Flow Rate: Approx. 35 gal/min

Hydraulic Pressure: Up to 2,500 psi

Operating Weight: Approx. 19,000 – 20,500 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. 23.7 ft × 8.1 ft × 11.3 ft

Performance & Design Highlights

Turbocharged Power Upgrade: The 780D features the 504BDT turbo engine for improved digging, loading, and roading performance, with increased torque over the 780C.

Enhanced Hydraulic Capacity: Larger pumps deliver faster cycle times and more lifting power, especially under load in both loader and backhoe operations.

High-Capacity Loader Arms: Strengthened frame and linkage support heavy-duty use in gravel, trenching, and storm drain installation.

Extendahoe Reach: Extendable dipperstick allows increased digging depth and working range, minimizing machine repositioning.

Operator Comfort: Optional enclosed cab with upgraded seat, HVAC, and ergonomic lever layout improves comfort during long shifts.

Routine Maintenance

• Engine Oil & Filter: Change every 200 hours

• Transmission Fluid & Filter: Replace every 500 hours

• Hydraulic Oil & Filters: Change every 500 hours

• Fuel Filters: Replace every 250 hours

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

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

• Backhoe & Loader Pins: Grease daily to reduce bushing wear

Common Issues & Fixes

Hydraulic Cylinder Leaks: Cylinder seals wear over time—rebuild loader and backhoe cylinders with OEM seal kits.

Stiff Loader Control Levers: Caused by gummed control linkages or worn detents—clean and lubricate pivot points and inspect valve spools.

Weak Shuttle Engagement: May result from worn clutch packs or low pressure in the power shuttle—inspect solenoid, seals, and fluid pressure.

Overheating in Hot Climates: Check fan belts, radiator fins, and oil cooler—clean system and verify coolant quality.

Fuel Delivery Hesitation: Air leaks or old fuel lines can reduce injector pressure—replace cracked lines and tighten clamps.

Loose Backhoe Swing Frame: Worn pivot pins and bushing slop can be resolved with pin kits and daily greasing to extend component life.