333/G5393 Parker JCB Gear Pump 14cc 3CX 4CX

Product Overview

The 333/G5393 is an engine-mounted fixed-displacement hydraulic gear pump used on JCB 3CX and 4CX backhoe loaders.

JCB’s official parts website identifies 333/G5390 as a separate 36/29 cc/rev twin gear pump, while JCB specialist parts documentation identifies 333/G5393 as a 14 cc/rev engine-mounted hydraulic pump. These are therefore two different hydraulic pump configurations and must not be treated as interchangeable simply because they are used on the same JCB platform.

Public Parker/JCB replacement documentation identifies the 333/G5393 configuration as 14 cm³/rev, counterclockwise rotation, T2 1:5 tapered shaft, K5 mounting flange and approximately 16 kg, with applications on JCB 3CX/4CX backhoe loaders.

Parker’s official PGP600 family documentation describes a heavy-duty cast-iron gear-pump architecture incorporating interlocking body construction, journal bushings and pressure-balanced thrust plates, designed for high-duty mobile and industrial applications.

For replacement engineering, correct compatibility requires verification of displacement, rotation, shaft geometry, mounting flange, port configuration and installation dimensions.

Technical Specifications

333/G5393

• JCB Part Number: 333/G5393
• Cross Reference: 333G5393
• Related Part Numbers: 332/G6161, 702911008 in public replacement documentation
• Product Type: Engine-Mounted Hydraulic Gear Pump
• Pump Type: Fixed Displacement
• Displacement: 14 cm³/rev
• Theoretical Flow: approximately 14 L/min per 1000 rpm
• Rotation: Counterclockwise / CCW, viewed from the shaft end
• Shaft: T2, 1:5 tapered shaft
• Mounting Flange: K5
• Approximate Weight: 16 kg
• Application: JCB 3CX / 4CX Backhoe Loaders
• Mounting: Engine mounted
• Control: Fixed mechanical displacement; no variable-displacement mechanism
• Rated Pressure: Not independently verified for the complete 333/G5393 part number from a current Parker/JCB OEM public datasheet
• Peak Pressure: Not independently verified
• Maximum Speed: Not independently verified for the complete 333/G5393 part number
• Testing: Replacement units can be subjected to 100% simulated working-condition testing according to the original machine requirements.

Data-integrity note: The 14 cm³/rev displacement, CCW rotation, T2 1:5 tapered shaft, K5 mounting flange and approximately 16 kg mass are supported by public JCB/Parker replacement documentation. Pressure and maximum-speed values are intentionally omitted because a current OEM document directly mapping the complete 333/G5393 number to those ratings was not located.

Key Technical Advantages

1. 14 cm³/rev Fixed Displacement

The verified nominal displacement is 14 cm³/rev, providing a predictable hydraulic output for the engine-driven JCB hydraulic system.

At a theoretical 1000 rpm:

14 × 1000 ÷ 1000 = 14 L/min

Actual delivery depends on operating speed, pressure and volumetric efficiency.

2. Engine-Mounted Configuration

The 333/G5393 is specifically identified as an engine-mounted hydraulic pump, meaning its shaft and flange geometry must match the engine-side mechanical drive.

This makes shaft engagement, flange alignment and rotation verification critical during replacement.

3. T2 1:5 Tapered Shaft

Public replacement documentation identifies the drive configuration as a T2 1:5 tapered shaft.

Correct taper and engagement are essential for maintaining concentricity and reliable torque transmission.

4. Parker PGP600 Heavy-Duty Design Reference

Parker’s official PGP600 documentation specifies a heavy-duty cast-iron gear-pump architecture with:

• Two-piece interlocking body
• Cast-iron construction
• Journal bushings
• Pressure-balanced thrust plates
• Multiple-section capability

These design elements are intended to support efficiency, durability and high-power-density operation in demanding hydraulic applications.

5. Proven Mobile-Equipment Application

The 333/G5393 is associated with JCB 3CX/4CX backhoe-loader hydraulic pump assemblies, while Parker’s PGP600 family is designed for demanding mobile and industrial markets such as construction and material handling.

6. Clear Separation From 333/G5390

A critical selection distinction is:

• 333/G5393: 14 cm³/rev single pump
• 333/G5390: 36/29 cm³/rev twin pump

JCB’s official product page directly identifies 333/G5390 as a 36/29 ccr twin gear pump.

Application Areas

Typical applications include:

• JCB 3CX Backhoe Loaders
• JCB 4CX Backhoe Loaders
• JCB 3CX/4CX engine-mounted hydraulic pump assemblies
• Auxiliary hydraulic circuits on backhoe loaders
• Mobile construction machinery
• JCB hydraulic pump replacement and retrofit projects

Public JCB-related documentation directly associates 333/G5393 with 3CX/4CX backhoe loaders and identifies the pump as an engine-mounted 14 cc configuration.

Expert Maintenance Tips

1. Verify Rotation Before Startup

The documented 333/G5393 configuration is counterclockwise when viewed from the shaft end. Always verify the actual engine-side rotation before commissioning.

2. Inspect the 1:5 Tapered Shaft

Check the taper surface, coupling engagement and locking condition before installation. Do not force the pump into position with impact loading on the shaft.

3. Confirm K5 Flange Alignment

The K5 mounting interface must sit correctly against the engine mounting face. Incorrect flange alignment can transmit unwanted loads into the shaft and bearing system.

4. Protect the Suction Circuit

Because an engine-driven pump experiences changing rotational speed, the suction circuit must be designed for the highest practical engine speed. Excessive inlet restriction can cause cavitation, noise, reduced flow and accelerated wear.

5. Control Hydraulic Contamination

Parker’s PGP600 documentation emphasizes hydraulic-fluid cleanliness and filtration according to operating pressure. Proper contamination control is essential for gear, bearing and pressure-compensation component life.

6. Verify More Than Displacement

Before replacing a 333/G5393, confirm:

• 14 cm³/rev displacement
• Counterclockwise rotation
• T2 1:5 tapered shaft
• K5 mounting flange
• Shaft extension
• Port size
• Port orientation
• Overall installation dimensions
• Engine-side mounting interface

7. Never Substitute 333/G5390 Without Re-Selection

If the original machine carries 333/G5390, the correct product category is the 36/29 cm³/rev twin hydraulic pump, not the 14 cm³/rev 333/G5393. JCB officially distinguishes the two part numbers.

8. Apply 100% Simulated Working-Condition Testing

For replacement units, our engineering process can reproduce the original machine’s:

• Operating speed
• Hydraulic pressure
• Oil temperature
• Working cycle
• Suction conditions
• Mechanical installation

This supports validation of flow delivery, hydraulic response, noise and thermal behavior before field installation.