1115143C20 | Parker Twin Gear Pump 41+26cc 250bar

Product Overview

The 1115143C20 Series Twin Hydraulic Gear Pumps are high-performance dual gear pumps from Parker Hannifin, specifically engineered for JCB (J.C. Bamford Excavators Limited) backhoe loaders including 3CX and 4CX models. Parker is a global leader in motion and control technologies.

This series features a twin gear pump design, integrating a front pump and a rear pump in a tandem assembly to supply two independent hydraulic circuits simultaneously—typically the implement system and the steering system. Constructed with high-strength cast iron housing and precision-machined gears, the series delivers high efficiency, high pressure resistance, exceptional reliability, and long service life.

Configuration details for each model are as follows:

• 1115143C20 (20/925340) : Front pump 41 cc/rev, rear pump 26 cc/rev, 1″ SAE 15-tooth spline shaft, clockwise rotation (viewed from shaft end), SAE B 2-bolt mounting flange, front pump max working pressure 250 bar, rear pump 275 bar

• 20/925579: Front pump 36 cc/rev, rear pump 26 cc/rev, 1″ SAE 15-tooth spline shaft, clockwise rotation, SAE B 2-bolt mounting flange, front pump max working pressure 250 bar, rear pump 275 bar

• 20/925581: Front pump 37 cc/rev, rear pump 33 cc/rev, total displacement 45 ml/rev, rated pressure 16-18 MPa, max pressure 25 MPa, rated speed 1500-2200 rpm, max speed 2800 rpm

• 20/903200: Front pump 41 cc/rev, rear pump 29 cc/rev, 1″ parallel keyed shaft, counter-clockwise rotation, SAE B 2-bolt mounting flange

• 20/911200: Front pump 41 cc/rev, rear pump 29 cc/rev, 1″ parallel keyed shaft, counter-clockwise rotation, SAE B 2-bolt mounting flange

We specialize in the R&D and manufacturing of high-pressure pumps, motors, and valve groups. All 1115143C20 series models offer 100% direct interchangeability with original Parker pumps of the same series and model (OEM Nos. 20/925340, 20/925579, 20/925581, 20/903200, 20/911200, etc.)—no modification required. Every unit undergoes 100% simulated load testing before shipment, ensuring performance validation under real-world operating conditions.

Technical Specifications 

General Specifications:

• Brand Series: Parker Hannifin

• Pump Type: External gear pump (twin configuration)

• Housing Material: High-strength cast iron

• Gear Material: High-precision steel gears

• Mounting Flange: SAE B 2-bolt mounting flange

• Fluid Media: Hydraulic oil (ISO VG32-68)

• Fluid Temperature Range: -20°C to 80°C

• Viscosity Range: 15-75 cSt

• Compatible Equipment: JCB 3CX, 4CX, 214E, 3C series, etc.

1115143C20 (20/925340) Specifications:

• Model: 1115143C20 / 20/925340

• Rotation Direction: Clockwise (viewed from shaft end)

• Shaft: 1″ Diameter, 15-tooth SAE splined shaft, 16/32 pitch

• Mounting Flange: SAE B 2-hole mounting flange

• Front Pump Displacement: 41 cc/rev (41 L/min @ 1000 rpm)

• Rear Pump Displacement: 26 cc/rev (26 L/min @ 1000 rpm)

• Inlet: Single 2″ SAE flange inlet

• Front Pump Outlet: 1 1/16″-12 UNF threaded

• Rear Pump Outlet: 7/8″-14 UNF threaded

• Front Pump Max Working Pressure: 250 bar

• Rear Pump Max Working Pressure: 275 bar

• Max Input Shaft Torque: 460 Nm

20/925579 Specifications:

• Model: 20/925579

• Rotation Direction: Clockwise (viewed from shaft end)

• Shaft: 1″ Diameter, 15-tooth SAE splined shaft, 16/32 pitch

• Mounting Flange: SAE B 2-hole mounting flange

• Front Pump Displacement: 36 cc/rev (36 L/min @ 1000 rpm)

• Rear Pump Displacement: 26 cc/rev (26 L/min @ 1000 rpm)

• Inlet: Single 2″ SAE flange inlet

• Front Pump Outlet: 1 1/16″-12 UNF threaded

• Rear Pump Outlet: 7/8″-14 UNF threaded

• Front Pump Max Working Pressure: 250 bar

• Rear Pump Max Working Pressure: 275 bar

• Max Input Shaft Torque: 460 Nm

• Weight: Approx. 26 kg

20/925581 Specifications:

• Model: 20/925581

• Total Displacement: 45 ml/rev

• Rated Pressure: 16-18 MPa (160-180 bar)

• Maximum Pressure: 25 MPa (250 bar)

• Rated Speed: 1500-2200 rpm

• Maximum Speed: 2800 rpm

• Flow Rate: 60-100 L/min (speed dependent)

20/903200 Specifications:

• Model: 20/903200

• Rotation Direction: Counter-clockwise (viewed from shaft end)

• Shaft: 1″ Diameter parallel keyed shaft

• Mounting Flange: SAE B 2-hole mounting flange

• Front Pump Displacement: 41 cc/rev (41 L/min @ 1000 rpm)

• Rear Pump Displacement: 29 cc/rev

20/911200 Specifications:

• Model: 20/911200

• Rotation Direction: Counter-clockwise (viewed from shaft end)

• Shaft: 1″ Diameter parallel keyed shaft

• Mounting Flange: SAE B 2-hole mounting flange

• Front Pump Displacement: 41 cc/rev (41 L/min @ 1000 rpm)

• Rear Pump Displacement: 29 cc/rev

• Front Pump Max Working Pressure: 220 bar

• Peak Pressure: 275 bar

• Max Input Shaft Torque: 325 Nm

Key Technical Advantages

1. High-Strength Cast Iron Housing – Withstands Harsh Construction Equipment Conditions

The 1115143C20 series features high-strength cast iron housing with robust, durable construction. Cast iron provides superior structural stability and deformation resistance under the high-impact, high-pressure conditions typical of backhoe loader operations, ensuring long-term reliable performance.

2. Integrated Twin Pump Design – Simplifies Hydraulic System Layout

This series integrates front and rear pumps into a single assembly, supplying two independent hydraulic circuits simultaneously—typically the implement system and steering system of JCB 3CX/4CX machines. This twin design significantly reduces hydraulic circuit complexity and the number of fittings, minimizes leak points, and saves valuable installation space.

3. Precision-Ground Gears – High Efficiency with Low-Noise Operation

The series features high-precision steel gears with precision machining, ensuring high volumetric efficiency and stable oil flow output. Low-noise operation improves the equipment operator’s working environment and reduces fatigue during extended operation.

4. High Pressure Capability – Handles Heavy-Duty Applications

The series delivers front pump working pressures up to 250 bar and rear pump pressures up to 275 bar. This high pressure capability ensures powerful hydraulic output for JCB backhoe loaders during demanding digging and loading operations.

5. Flexible Configuration Options – Compatible with Multiple JCB Models

The series offers multiple displacement combinations (41+26, 36+26, 37+33, 41+29), shaft types (spline/keyed), and rotation directions (clockwise/counter-clockwise), compatible with JCB 3CX, 4CX, 214E, 3C series, and other models.

Application Areas

• JCB 3CX Backhoe Loaders—implement hydraulic systems and steering systems

• JCB 4CX Backhoe Loaders—implement hydraulic systems and steering systems

• JCB 214E / 3C Series—hydraulic systems

• Construction Machinery—hydraulic systems for various backhoe loaders

• Agricultural Machinery—hydraulic systems for high-power tractors

• Industrial Hydraulic Systems—hydraulic transmission systems for industrial equipment

Expert Maintenance Tips

Model Code Verification (verify each element) :

Before installation, carefully verify the complete model code on the pump nameplate and confirm the following:

• Model number (e.g., 1115143C20, 20/925340, etc.) : Parker OEM number corresponding to different displacement combinations and configurations.

• Rotation direction: Some models are clockwise (viewed from shaft end, e.g., 20/925340, 20/925579), while others are counter-clockwise (e.g., 20/903200, 20/911200). Incorrect rotation will prevent pressure build-up.

• Shaft type: Splined (1″ 15-tooth SAE, 16/32 pitch) or parallel keyed.

• Mounting flange: SAE B 2-hole mounting flange.

JCB Equipment Cross-Reference:

These pumps are fully interchangeable with the following JCB OEM part numbers:

• 20/925340 interchanges with 7029120005, 332/E6671

• 20/925579 interchanges with 332/F9029, 333/G5392

• 20/925581 interchanges with 332/F9031, 333/G5391

• 20/903200 and 20/911200 are interchangeable

Identify Twin Pump Inlet and Outlet Ports:

The twin pump features two independent inlet and outlet port sets. During installation, carefully distinguish between the front pump and rear pump port markings. Incorrect port connections will cause abnormal system pressure or pump damage.

Mounting Flange and Drive Shaft Matching:

Verify that the equipment-side flange type and shaft specification match the pump configuration before installation:

• Spline shaft models (20/925340, 20/925579): 1″ 15-tooth SAE spline shaft, 16/32 pitch

• Keyed shaft models (20/903200, 20/911200): 1″ parallel keyed shaft

Suction Line and Fluid Requirements:

Use ISO VG32-68 hydraulic oil. Ensure the suction line is properly sealed with no air leaks and the suction filter is not clogged. Fluid temperature should be maintained within -20°C to 80°C. Viscosity should be maintained within 15-75 cSt.

First-Start Priming Procedure:

After new pump installation or system overhaul, ensure the pump cavity is filled with oil before first start. Jog the pump at low speed and low pressure until the pump body is fully filled with oil and air is purged, then gradually increase to rated speed and working pressure. Running the pump dry will cause irreversible damage to gears and bearings.

Regular Inspection and Maintenance:

Inspect pump operating condition every 500 operating hours—check for leaks, shaft wear, and fluid cleanliness. Regularly monitor pump body temperature—if it consistently exceeds +80°C, inspect the system cooling. Listen for abnormal noise or vibration during operation; if detected, shut down and troubleshoot immediately.