322/F9032 JCB Hydraulic Gear Pump | 37+37cc 275 bar for 3CX/4CX

Product Overview

The 322/F9032 (also known as 332/F9032) is a heavy-duty twin hydraulic gear pump manufactured by Parker Hannifin for JCB 3CX / 4CX series backhoe loaders. This model features a twin gear pump configuration with both front and rear pump displacements of 37 cc/rev. Two independent pump stages are driven by a common input shaft, enabling simultaneous oil supply to two independent hydraulic circuits—serving the loader and excavator functions respectively.

Manufactured by Parker Hannifin to JCB original technical specifications, this pump features a high-strength cast iron housing with precision-machined gears and SAE standard interfaces, delivering excellent fatigue strength and dimensional stability. Engineered as a direct OEM-replacement solution, this model fully complies with JCB / Parker original design standards and mounting interface specifications, offering 100% direct interchangeability with OEM pumps. Every unit undergoes 100% workload simulation testing prior to shipment, rigorously validating pressure retention, volumetric efficiency, and internal leakage performance to meet or exceed OEM standards.

Model & Part Number Reference:

• 322/F9032 — JCB Part Number (primary)

• 332/F9032 — Cross-reference part number

• 7029120052 / 7029120055 — Parker cross-reference part numbers

• This model shares the same mounting interface and design platform with series-compatible models such as 332/F9030 and 20/925580

Technical Specifications 

• Model: 322/F9032 (JCB Part No.) / 332/F9032 (Cross-reference)

• Pump Type: Twin Gear Pump

• Front Pump Displacement: 37 cc/rev (37 L/min @ 1000 rpm)

• Rear Pump Displacement: 37 cc/rev (37 L/min @ 1000 rpm)

• Total Displacement: 74 cc/rev

• Rotation Direction: Clockwise (viewed from shaft end)

• Mounting Flange: SAE B 2-bolt flange

• Shaft Type: 1-inch diameter, 15-tooth SAE splined shaft, 16/32 pitch

• Inlet: Single 2-inch SAE flange

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

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

• Maximum Input Shaft Torque: 460 Nm

• Housing Material: High-strength cast iron

• Gear Material: Hardened steel gears

• Compatible Models: JCB 3CX, JCB 4CX backhoe loaders

Key Technical Advantages

1. Twin Pump Design – One Pump, Two Circuits
The 322/F9032 features a twin gear pump configuration with both front and rear stages delivering 37 cc/rev displacement, driven by a common input shaft. This enables independent oil supply to both the loader and excavator hydraulic systems of the backhoe loader. The design significantly reduces the number of pumps required, saves installation space, and lowers system complexity. The two stages can operate independently or be combined for greater total flow output.

2. High-Strength Cast Iron Housing for Durability
The pump housing is manufactured from high-strength cast iron, offering superior fatigue strength and impact resistance compared to aluminum housings. The excellent damping characteristics of cast iron effectively absorb vibration and shock loads during operation—particularly suitable for backhoe loaders operating in harsh conditions over extended periods. The gears are case-hardened to provide superior resistance to wear and contamination.

3. Large Displacement with High Flow Output
With 37 cc/rev displacement per stage, each pump stage delivers 37 L/min at 1000 rpm. When combined, the two stages can deliver up to 74 L/min total flow—fully meeting the high-flow demands of backhoe loader operations including digging, lifting, and loading.

4. High-Pressure Capability for Heavy-Duty Applications
Maximum input shaft torque reaches 460 Nm, ensuring reliable power transmission under extreme loads. The combination of high-strength cast iron housing and hardened steel gears enables the pump to withstand the high impact loads encountered during heavy-duty backhoe loader operations.

5. JCB OEM Specification – 100% Direct Interchangeability
This model is manufactured to JCB / Parker original technical specifications, with flange dimensions, spline shaft specifications, and mounting interfaces identical to OEM pumps. 322/F9032 is cross-compatible with 332/F9032and interchangeable with series-compatible part numbers including 7029120052 and 7029120055—direct drop-in replacement with zero modifications required.

6. 100% Factory Tested
Every unit undergoes 100% workload simulation testing prior to shipment, covering pressure retention verification, internal leakage detection, and flow validation—ensuring every unit meets design performance standards.

Application Areas

This twin gear pump is specifically designed for JCB backhoe loader hydraulic systems and is widely used in the following equipment:

• JCB 3CX Backhoe Loaders: 3CX, 3CX Super, 3CX LWT, 3CXS, 3CX-T and all series variants

• JCB 4CX Backhoe Loaders: 4CX, 4CX Super, 4CXSM and variants

• Other JCB Equipment: Shares mounting interface with series-compatible models such as 332/F9030 and 20/925580, adaptable to corresponding models

Expert Maintenance Tips

1. Model Confirmation
322/F9032 and 332/F9032 are different catalog numbers for the same product. Before installation, always verify the complete part number on the original pump nameplate—it may be marked as either 322/F9032 or 332/F9032, both are fully equivalent. Also confirm compatibility with cross-reference numbers such as 7029120052 / 7029120055.

2. Rotation Direction Confirmation
This model features clockwise rotation (viewed from the shaft end). Before installation, always verify that the PTO rotation direction of the host machine matches the pump’s rotation direction—incorrect rotation will result in pump failure to prime and may cause severe damage to gears and bearings within a short period.

3. Installation Precautions

• Thoroughly clean the SAE B 2-bolt flange and 1-inch 15-tooth SAE splined shaft mating surfaces before installation to ensure no debris remains

• Use SAE-specified torque values for mounting bolts—avoid over-tightening which may cause cast iron housing distortion or bolt fracture

• The inlet is a single 2-inch SAE flange; both pump outlets are 1 1/16″-12 UNF threaded—ensure correct thread specifications during connection

4. First Start-Up and Bleeding

• Before first start-up, must fill both pump stages with hydraulic oil through the inlet port—never start dry

• After start-up, run at low speed with no load for 2–3 minutes to ensure complete air evacuation from both stages and the system

• Check both stages separately for abnormal noise or leakage—while cast iron pumps are more durable than aluminum counterparts, they remain sensitive to cavitation

5. Fluid and Filtration

• Use high-quality anti-wear hydraulic oil compliant with JCB specifications

• Maintain system oil cleanliness to ISO 4406 18/15 or better

• Cast iron gear pumps are sensitive to fluid cleanliness—regularly replace return line filters

6. Periodic Maintenance

• Check mounting bolt torque every 1,000 operating hours

• Regularly monitor operating pressure of both stages to ensure they do not exceed rated values

• If flow output decreases, noise levels increase abnormally, or system temperature rises excessively, inspect and replace worn components promptly