Product Overview
The 332/G7135, 333/G5390, 20/925340, and 7029120005 series tandem hydraulic gear pumps are Parker Hannifin’s purpose-built main hydraulic pumps for the JCB 3CX / 4CX series backhoe loaders. Featuring a tandem (dual-section) gear pump configuration, these units deliver two independent hydraulic outputs from a single drive shaft input – one for the working attachment (loading/excavation) and one for the steering/auxiliary system – making them the core power components of the JCB 3CX/4CX hydraulic system.
Key Interchangeability Advantage: Our 332/G7135 / 333/G5390 / 20/925340 / 7029120005 series tandem gear pumps are manufactured to strict Parker original design specifications, ensuring 100% direct interchangeability with original units. All mounting interfaces (SAE B 2-bolt flange), drive shaft (1″ diameter 15-tooth SAE splined shaft, 16/32 pitch), and port configurations are identical to the original product – no modifications required for direct replacement on JCB 3CX/4CX machines. Every pump undergoes 100% factory performance testing under simulated operating conditions (covering rated pressure, peak pressure, and full speed range performance curves), guaranteeing plug-and-play reliability with zero performance deviation.
Model Code Breakdown:
332/G7135 / 333/G5390 = JCB part numbers for Parker tandem gear pump, 36 cm³/rev front + 29 cm³/rev rear
20/925340 / 7029120005 = JCB/Parker part numbers for Parker tandem gear pump, 41 cm³/rev front + 26 cm³/rev rear
Technical Specifications
332/G7135 / 333/G5390 Series (36 + 29 cm³/rev)
Product Series: Parker Tandem External Gear Pump
Compatible Models: JCB 3CX, 4CX, 214, 215, 216, 217 series backhoe loaders
Front Pump Displacement: 36 cm³/rev (36 L/min @ 1000 rpm)
Rear Pump Displacement: 29 cm³/rev (29 L/min @ 1000 rpm)
Front Pump Maximum Working Pressure: 250 bar
Rear Pump Maximum Working Pressure: 275 bar
Rotation: Clockwise (viewed from shaft end)
Drive Shaft: 1″ Diameter 15-tooth SAE splined shaft, 16/32 pitch
Mounting Flange: SAE B 2-bolt
Inlet Port: Single 2″ SAE flange inlet
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
Weight: Approx. 26 kg
20/925340 / 7029120005 Series (41 + 26 cm³/rev)
Product Series: Parker Tandem External Gear Pump
Compatible Models: JCB 3CX, 4CX, 214, 215, 217, 3CN series backhoe loaders
Front Pump Displacement: 41 cm³/rev (41 L/min @ 1000 rpm)
Rear Pump Displacement: 26 cm³/rev (26 L/min @ 1000 rpm)
Front Pump Maximum Working Pressure: 250 bar
Rear Pump Maximum Working Pressure: 275 bar
Rotation: Clockwise (viewed from shaft end)
Drive Shaft: 1″ Diameter 15-tooth SAE splined shaft, 16/32 pitch
Mounting Flange: SAE B 2-bolt
Inlet Port: Single 2″ SAE flange inlet
Front Pump Outlet: 1 1/16″-12 UNF threaded
Rear Pump Outlet: 7/8″-14 UNF threaded
Maximum Input Shaft Torque: 460 Nm
Housing Material: High-strength cast iron
Weight: Approx. 26 kg
Key Technical Advantages
1. Tandem Integrated Design for Independent Dual-Circuit Output
Two independent gear sections are integrated in series within a single cast iron housing, driven by a single input shaft to simultaneously power the front pump (41/36 cm³/rev) and rear pump (26/29 cm³/rev), independently supplying oil to the working attachment (loading/excavation) and steering/auxiliary systems. This design dramatically simplifies hydraulic piping layout on JCB 3CX/4CX machines, reducing external connection points and leakage risks.
2. High-Strength Cast Iron Housing for Demanding Conditions
Manufactured with high-strength cast iron housing, offering excellent impact resistance and structural rigidity to withstand high-frequency vibration and heavy shock loads encountered by JCB 3CX/4CX machines in construction sites, quarries, and other harsh environments.
3. SAE B Standard Interface for Direct OEM Replacement
Manufactured to strict Parker original design standards with mounting flange, splined shaft, and port dimensions and positions identical to original units. The 1″ diameter 15-tooth SAE splined shaft precisely matches JCB factory drive interfaces – direct installation with no modifications required.
4. High Pressure Capacity for Heavy-Duty Operations
Front pump maximum working pressure 250 bar and rear pump up to 275 bar – fully meeting the power demands of JCB 3CX/4CX excavating, loading, steering, and other hydraulic functions. Maximum input shaft torque 460 Nm ensures stable output under heavy load conditions.
5. Broad Compatibility Coverage
The 332/G7135 / 333/G5390 and 20/925340 / 7029120005 series pumps are compatible with dozens of JCB 3CX, 4CX, 214, 215, 216, and 217 model variants – making them the most widely used replacement pump solution for JCB backhoe loader hydraulic systems.
Application Areas
JCB 3CX Backhoe Loader: The world’s best-selling backhoe loader, used in construction sites, municipal engineering, agricultural water conservancy, and other excavation and loading applications
JCB 4CX Backhoe Loader: High-specification backhoe loader for heavier-duty operations
JCB 214 / 215 / 216 / 217 Series: JCB mid-size backhoe loaders and industrial tractor series
JCB 3CN / 4CN Series: JCB narrow-body backhoe loader series
Construction & Municipal Engineering: Road construction, pipeline installation, foundation excavation
Agriculture & Water Conservancy: Farmland improvement, irrigation channel excavation, small-scale earthworks
Mining & Quarries: Ore loading, site leveling, material transfer
Expert Maintenance Tips
1. Model Confirmation and Selection
332/G7135 and 333/G5390 reference the same pump under different JCB part numbers – both are identical in mounting interface and performance (36+29 cm³/rev). 20/925340 and 7029120005 form another equivalent part number pair (41+26 cm³/rev).
Verify original machine main pump displacement specifications to select the correct model – do not mix different displacement ratings.
2. Pre-Installation Checks
Confirm pump rotation is clockwise (viewed from shaft end), matching JCB original drive direction.
Check drive splined shaft (1″ diameter 15-tooth SAE spline, 16/32 pitch) and coupling condition – never use hammer-driven installation.
Confirm port specifications (front 1 1/16″-12 UNF, rear 7/8″-14 UNF) precisely match hydraulic fittings.
3. First Start-Up & Oil Priming
Prime the pump housing with clean hydraulic oil before first start-up; ensure suction line is fully filled – never run dry.
Recommended fluid: JCB OEM-spec anti-wear hydraulic oil, ISO VG 46 viscosity.
Single 2″ SAE flange inlet – ensure suction line is unobstructed.
4. Filtration & Fluid Cleanliness
5. Operating Monitoring
Front pump maximum working pressure must not exceed 250 bar; rear pump not exceed 275 bar.
If abnormal noise or pressure fluctuation occurs, first check suction lines for leakage or blockage.
Maximum input shaft torque 460 Nm – ensure prime mover output torque meets this requirement during system design.
