RE241577 RE241578 John Deere Tractor Hydraulic Pump 45cc 200bar

Product Overview

The RE241577 and RE241578 are John Deere tandem external gear pumps for tractor hydraulic systems, serving as the main hydraulic pump to supply fluid power to both the steering system and the hitch/lift system. The RE241577 features a 25+13 cc dual pump group configuration (OEM internal part number 25A25/13X577JD), while the RE241578 features a 32+13 cc dual pump group configuration (OEM internal part number 25A32/13X578JD). Both models share compatible mounting flanges, drive shaft splines, port layouts, and rotation direction, forming a cross-reference relationship for selection based on specific tractor models.

These tandem pumps fit John Deere 6403, 904, 1054, 1204, 1354, 1404, and 6603 medium tractors, compatible with 4045 and 6068 series engines. The external gear pump design with straight involute tooth profile delivers high efficiency, excellent impact resistance, low noise, and strong contamination tolerance. The high-strength cast iron housing weighs approximately 12.6 kg. The mounting flange is JD standard with rated working pressure of 16 MPa (160 bar), maximum intermittent pressure of 20 MPa (200 bar), and rated flow of 90–95 L/min.

Manufactured to exact John Deere OEM specifications, every unit features interfaces fully consistent with the original pump for true drop-in interchangeability — no piping or coupling modification required. Each pump undergoes 100% simulated operating condition testing before shipment, covering rated pressure loading, flow verification, and housing sealing integrity.

Technical Specifications 

• Model: RE241577 (25A25/13X577JD) / RE241578 (25A32/13X578JD)

• Pump Type: External gear pump, tandem pump group

• Displacement (RE241577): 25+13 cm³/rev (dual pump group)

• Displacement (RE241578): 32+13 cm³/rev (dual pump group)

• Rated Pressure: 16 MPa (160 bar)

• Maximum Intermittent Pressure: 20 MPa (200 bar)

• Maximum Speed: 2,500 rpm

• Rated Flow: 90–95 L/min

• Rotation Direction: Left-hand (counter-clockwise, viewed from shaft end)

• Mounting Flange: JD standard flange mount

• Net Weight: Approx. 12.6 kg

• Recommended Hydraulic Fluid: ISO VG46 hydraulic oil

• Compatible Engines: 4045 series, 6068 series

• Compatible Tractor Models (RE241578): 1054 / 1204 / 1354 / 1404 / 6603 / 0904

• Compatible Tractor Models (RE241577): 6403 (6079–6403 Mexican/South Africa/Asian Edition, 9201–6403 North American Edition) / 904 (11513–904 China Edition)

Key Technical Advantages

1. Integrated Tandem Pump Design: The RE241577/RE241578 utilize a tandem gear pump structure integrating two independent gear pump groups within a single housing, supplying separate circuits for the main hydraulic system and steering system. This tandem design eliminates the need for external flow divider piping, reduces connection points and potential leak paths, and saves installation space in the engine compartment. The RE241577 offers a 25+13 cc configuration while the RE241578 provides a 32+13 cc configuration, allowing flexible selection based on tractor hydraulic flow requirements.

2. Precision-Machined External Involute Gears: Gears use a straight involute tooth profile with precision ground tooth surfaces for high contact accuracy. The involute profile provides a long meshing length that effectively reduces flow and pressure pulsation for smooth, low-noise operation. High-precision clearance between gears and housing ensures high volumetric efficiency and stable flow output under medium-to-high pressure conditions.

3. High-Strength Cast Iron Housing with Contamination Resistance: The pump housing is manufactured from high-strength cast iron with excellent rigidity and vibration resistance, capable of withstanding shock and vibration loads encountered in tractor operations. The external gear pump design is inherently insensitive to oil cleanliness, with strong contamination tolerance suitable for dusty field and construction site environments.

4. John Deere Drop-In Interchangeability and Cross-Reference: The RE241577 and RE241578 feature JD standard mounting flanges, drive shaft splines, port positions, and mounting dimensions fully consistent with original pumps. The two models serve as cross-references for each other. During equipment repair and replacement, the pump can be installed directly without modifying couplings, piping, or mounting bases — dramatically reducing downtime. Users can select the appropriate model based on tractor model and hydraulic flow requirements.

5. Precise Matching with 4045/6068 Engines: The pump’s drive interface and mounting position are specifically designed for 4045 and 6068 series engines, ensuring precise alignment with the engine PTO or gear drive system for high transmission efficiency and reliable installation.

Application Areas

• John Deere 1054 Tractor: Main hydraulic pump for steering and hitch systems

• John Deere 1204 Tractor: Hydraulic steering and hitch lift system power source

• John Deere 1354 Tractor: Main hydraulic pump drive

• John Deere 1404 Tractor: Steering and implement hydraulic system supply

• John Deere 6603 Tractor: 6-cylinder tractor main hydraulic pump (RE241578)

• John Deere 6403 Tractor: Fits RE241577 — 6079–6403, 9201–6403, 11513–904 editions

• John Deere 904 Tractor: China Edition 11513–904 model fits RE241577

Expert Maintenance Tips

1. Shaft Alignment and Flange Connection: Concentricity deviation between the pump and engine drive shaft must be less than 0.05 mm, with angular deviation less than 0.25°. The RE241577/RE241578 uses JD standard flange mounting. Tighten flange bolts in diagonal sequence for even loading. When replacing the pump, check that the original mounting base locating step is in good condition — repair the base before installing a new pump if worn.

2. Initial Start-Up Filling and Bleeding: Pre-fill the pump with clean ISO VG46 hydraulic oil through the drain port before installation. Start the engine at the lowest speed and observe a steady oil flow from the case drain port free of bubbles. Once bleeding is complete, gradually increase to working pressure. Note that when hydraulic fluid temperature is below 10°C, warm-up operation is recommended to avoid insufficient suction under cold-start high-viscosity conditions.

3. Tandem Pump Port Correspondence Verification: Both the RE241577 and RE241578 are tandem pump groups. Before installation, verify that the front and rear pump group inlet and outlet ports correctly correspond to the system piping. The front pump group typically supplies the main hydraulic system, while the rear pump group supplies the steering system. Incorrect port connection will result in heavy steering or weak lift performance.

4. Rotation Direction Verification: This model is left-hand (counter-clockwise) rotation as viewed from the drive shaft end. Driving it clockwise is strictly prohibited — incorrect drive direction will reverse the suction and pressure sides, causing severe gear and bearing wear within a short period.

5. Fluid Cleanliness and Filter Replacement: Use ISO VG46 anti-wear hydraulic oil with system filtration of 25 μm or finer. Although external gear pumps have strong contamination tolerance, maintaining fluid cleanliness remains critical for extended pump life. Replace filter elements after the first 500 operating hours, then every 1,000 hours or annually thereafter. Regularly inspect the suction strainer for clogging.

6. Case Drain Line Inspection: The case drain line must return directly to the reservoir with backpressure not exceeding 0.5 bar. The drain line inner diameter must be sufficient to ensure unobstructed drainage during cold-start conditions. Regularly inspect the drain line for kinks, bends, or blockages.