Case 580K Backhoe Fluids and Capacities

[MikePhua]

Introduction
The 1990 Case 580K, part of the enduring 580 series, blends the engineering legacy of Case Corporation with practical hydraulic versatility. Powered by the 4-390 diesel engine, this mid-sized backhoe loader demands regular attention to fluid levels and types to maintain optimal performance and longevity.
Engine and Cooling Fluids

• Engine oil capacity is about 11.5 quarts (10.9 L) when including the filter. Multi-viscosity oil meeting API CC/CD or CE specifications is recommended.
  
• The cooling system holds 17.2 quarts (16.3 L) without a cab heater and 17.9 quarts (16.9 L) with one installed. A 50/50 ethylene glycol-water mixture is advised for protection in extreme temperatures.
  

Fuel

• The diesel fuel tank has a capacity of 25 gallons (95 L). Operators are recommended to use No. 2 diesel, while in cold climates, a blend with No. 1 diesel prevents waxing issues.
  

Hydraulic System

• The hydraulic reservoir holds 21.5 gallons (81.4 L), integrated into the loader upright.
  
• Case TCH Fluid is the specified type, ensuring compatibility and reliable performance.
  

Transmission and Drivetrain

• The transmission and transaxle together require 47.6 quarts (45 L) of Case Hy-Trans Plus (MS 1207).
  
• The combined system of hydraulics and transmission requires about 57.1 quarts (54 L).
  
• On four-wheel-drive models, the front axle differential holds 7.4 quarts (7 L), and each planetary gear unit holds 1.1 quarts (≈1 L) of Case H-135-H EP gear lube.
  

Brakes and Master Cylinder

• The brake reservoir uses Case TCH Fluid, the same as the hydraulics. DOT 3 brake fluid must not be used, as it causes seal swelling and damage.
  

Fluid Capacity Recap

• Engine oil: ~11.5 quarts (10.9 L) with filter
  
• Coolant: 17.2 quarts (16.3 L) without heater, 17.9 quarts (16.9 L) with heater
  
• Fuel tank: 25 gallons (95 L) of diesel
  
• Hydraulic reservoir: 21.5 gallons (81.4 L) of Case TCH Fluid
  
• Transmission/transaxle: 47.6 quarts (45 L) of Case Hy-Trans Plus
  
• Transmission + hydraulics combined: 57.1 quarts (54 L)
  
• Front axle differential (center): 7.4 quarts (7 L) of Case H-135-H EP gear lube
  
• Planetary gear unit (each): 1.1 quarts (~1 L) of Case H-135-H EP
  
• Brake reservoir: small volume, Case TCH Fluid only
  

Practical Insight from Owners

• Many operators find the hydraulic sight glass difficult to read when dirty. Keeping the area clean and checking on level ground with the machine in travel position helps ensure accuracy.
  
• Hydraulic lifting issues may not always be fluid level related. Relief valve pressure, which should be about 2550 psi, should be checked when performance feels weak.
  

Recommendations for Maintenance

• Always match fluid types and volumes with manual specifications.
  
• Replace fluids on schedule, as degraded oil or hydraulic fluid reduces efficiency and increases wear.
  
• Pay special attention to brake fluid type, ensuring only Case TCH Fluid is used.
  
• Monitor drivetrain fluids, especially in 4WD models, to prevent expensive damage.