JCB Twin Hydraulic Pump 20/925592 | JCB 3CX 4CX 214 215 217 | Main Tandem Gear Pump

LIC Hydraulic’s JCB Twin Hydraulic Pump (Tandem Series) is a premium-grade engineering solution designed for JCB Backhoe Loaders. Fully matching OEM part number 20/925592, this pump is the core power unit for JCB models including the 216, 217, 220, and the world-renowned 3CX and 4CX series. Engineered with a high-tensile cast iron body, it is built to endure the extreme pressure spikes and mechanical stress of heavy digging and loading cycles. We guarantee 100% Drop-in Interchangeability with original Parker/Casappa units. Every tandem pump undergoes 100% simulated load testing to ensure precise flow synchronization between the front and rear sections, optimizing multifunctional hydraulic performance.

Technical Specifications (Bulleted List)

• OEM Part Number: 20/925592 (Cross-reference: 20/925338, 20/925591)

• Compatible Models: JCB 3CX, 4CX, 214, 215, 216, 217, 218, 219, 220, 301, 302, 303

• Pump Design: External Tandem Gear Pump

• Front Displacement: 36/38 cm³/rev (Application specific)

• Rear Displacement: 26/29 cm³/rev (Application specific)

• Nominal Pressure: 250 bar (25 MPa / 3625 PSI)

• Peak Pressure: 280 bar (28 MPa / 4060 PSI)

• Drive Shaft: SAE 13-Tooth Splined Shaft

• Mounting Flange: SAE B 2-Bolt Pattern

• Body Material: Heavy-duty Anti-shock Cast Iron

Key Technical Advantages

• Heavy-Duty Cast Iron Construction: Designed specifically for backhoes, the cast iron housing resists deformation and fatigue under intense pressure pulses far better than aluminum alternatives, ensuring long-term structural integrity.

• Pressure-Balanced Bushings: Features floating bushings that automatically adjust axial clearance based on system pressure, maintaining over 95% volumetric efficiency and minimizing internal heat generation.

• Precision Micro-Finished Gears: Both gear sets are ground to micron tolerances, ensuring smooth engagement that reduces hydraulic noise in the cab and enhances low-speed torque delivery.

• Reinforced Sealing System: Equipped with high-pressure shaft seals designed for the harsh, dusty environments of construction sites, effectively preventing external contamination and oil leakage.

Application Areas

• JCB Backhoe Loaders: Powers the main boom, dipper, bucket, and stabilizer hydraulic circuits.

• Steering & Pilot Circuits: The rear pump section typically provides dedicated flow for steering stability and pilot-operated controls.

Expert Maintenance Tips

• Inlet Hose Inspection: Before installing the new pump, inspect the suction hose for internal collapse or aging. Air intake or restricted flow will cause cavitation, destroying the pump within minutes.

• Filtration Standards: Always replace the hydraulic return filter when installing a new pump. Maintain a cleanliness level of ISO 4406 18/15 to prevent residual metal particles from scoring the new bushings.

• Priming Protocol: Never start the pump dry. Fill the pump with clean hydraulic fluid via the inlet port and rotate the shaft manually several times before starting the engine.