CBGj1040/1020/1020R Hydraulic Gear Pump 40/20cc 20MPa 2500rpm

Product Overview

The CBGj1040/1020/1020R is a triple pump configuration within the CBGj Series high-pressure gear pumps, consisting of a 40 cm³/rev main pump section and two 20 cm³/rev secondary pump sections connected in tandem. The CBGj Series features high-strength cast iron housing, large-diameter needle roller bearings, fixed bimetallic side plates, and secondary sealing structures. It offers high pressure, wide speed range, high efficiency, excellent impact resistance, low noise, strong contamination resistance, compact size, and long service life—making it the primary hydraulic power component for excavators, wheel loaders, dump trucks, cranes, and other construction machinery.

The CBGj Series supports single, tandem, and triple pump configurations, enabling multiple independent oil sources driven by a single shaft—significantly simplifying hydraulic system layout. The CBGj1040/1020/1020R, as a standard triple pump configuration in the series, is widely used in complex hydraulic systems requiring multiple independent oil supply circuits.

As an original specification model within the CBGj Series, this product enables direct form-fit-function interchangeability with original units—no modifications to piping or mounting interfaces required. Our replacement solution strictly adheres to CBGj Series technical standards and undergoes 100% simulated in-service testing to ensure performance, reliability, and service life identical to OEM products. It is the ideal choice for hydraulic system maintenance and upgrades in construction machinery.

Technical Specifications 

Applicable Model (Primary):

• CBGj1040/1020/1020R

Model Code Breakdown:

• Product Series: CBGj — High-Pressure Gear Pump Series

• First Section Displacement: 1040 — 40 cm³/rev

• Second Section Displacement: 1020 — 20 cm³/rev

• Third Section Displacement: 1020 — 20 cm³/rev

• Suffix R: Rotation direction (Right-hand/Clockwise)

Reference Models:

• CBGj1040/1032/1020

• CBGj1040/1032/1016

• CBGj1050/1040/1040

• CBGj1050/1040/1032

• CBGj1040/1032/1032

Series Technical Specifications (per CBGj1 Series official performance data):

• Product Series: CBGj1 Series High-Pressure Gear Pump

• Body Material: High-Strength Cast Iron Housing

• Bearing Type: Large-Diameter Needle Roller Bearings

• Side Plate Construction: Fixed Bimetallic Side Plates + Secondary Sealing

• Connection Types: Diamond Flange / Square Flange

• Shaft Types: Parallel Key / Spline, Shaft Sizes 30mm / 32mm

• Pressure Range: 20 – 25 MPa

• Rated Speed: 2,000 – 2,500 rpm

• Maximum Speed: 2,800 rpm

• Operating Temperature: 10 – 65°C (Optimal 35 – 50°C)

• Fluid Compatibility: Anti-Wear Hydraulic Oil (L-HM46 or equivalent recommended)

• Mounting: Horizontal

Performance Parameters by Displacement (CBGj1 Series):

CBGj1010 — 10 cc/rev / Rated 20MPa / Max 25MPa / Rated 2500rpm / Max 2800rpm / Weight 15.15kg
CBGj1016 — 16 cc/rev / Rated 20MPa / Max 25MPa / Rated 2500rpm / Max 2800rpm / Weight 15.5kg
CBGj1020 — 20 cc/rev / Rated 20MPa / Max 25MPa / Rated 2500rpm / Max 2800rpm / Weight 15.8kg
CBGj1025 — 25 cc/rev / Rated 20MPa / Max 25MPa / Rated 2500rpm / Max 2800rpm / Weight 16.1kg
CBGj1032 — 32 cc/rev / Rated 20MPa / Max 25MPa / Rated 2500rpm / Max 2800rpm / Vol.Eff. 92% / Total Eff. 83% / Weight 16.7kg
CBGj1040 — 40 cc/rev / Rated 20MPa / Max 25MPa / Rated 2500rpm / Max 2800rpm / Weight 17.2kg
CBGj1045 — 45 cc/rev / Rated 16MPa / Max 20MPa / Rated 2500rpm / Max 2800rpm / Weight 17.6kg
CBGj1050 — 50 cc/rev / Rated 20MPa / Max 25MPa / Rated 2500rpm / Max 2800rpm / Weight 17.8kg

This Model (CBGj1040/1020/1020R) Detailed Specifications:

• Total Displacement: 40 + 20 + 20 = 80 cm³/rev

• First Section Displacement: 40 cm³/rev (CBGj1040)

• Second Section Displacement: 20 cm³/rev (CBGj1020)

• Third Section Displacement: 20 cm³/rev (CBGj1020)

• Rated Operating Pressure: 20 MPa (200 bar / 2,900 psi)

• Maximum Operating Pressure: 25 MPa (250 bar / 3,625 psi)

• Rated Speed: 2,500 min⁻¹

• Maximum Speed: 2,800 min⁻¹

• Rotation Direction: Right-Hand (Clockwise, viewed from shaft end)

• Theoretical Total Flow (@2,500 rpm): Approx. 200 L/min

• Volumetric Efficiency: ≥ 91% – 92%

• Overall Efficiency: ≥ 81% – 83%

• Operating Temperature Range: 10°C to 65°C (Optimal 35 – 50°C)

• Fluid Compatibility: Anti-Wear Hydraulic Oil (L-HM46 recommended)

Key Technical Advantages

1. High-Strength Cast Iron Housing with Needle Roller Bearings — Superior Durability
The CBGj Series features high-strength cast iron housing with large-diameter needle roller bearings, delivering excellent impact resistance and load-carrying capacity. The needle roller bearing construction effectively withstands radial loads, ensuring stable operation under the high-load, high-impact conditions typical of heavy construction machinery.

2. Fixed Bimetallic Side Plates with Secondary Sealing — High Volumetric Efficiency
Fixed bimetallic side plates and secondary sealing structures effectively minimize gear end-face leakage, significantly improving volumetric efficiency (≥91% – 92%). Stable output flow is maintained even under high-pressure conditions, enhancing overall system energy efficiency.

3. Triple Pump Modular Design — Flexible Multi-Circuit Oil Supply
The CBGj1040/1020/1020R features a triple pump configuration delivering three independent oil sources driven by a single shaft. The modular design enables flexible displacement combinations, adapting to diverse hydraulic system requirements—from excavators to cranes.

4. Excellent Contamination Resistance with Low-Noise Operation
The CBGj Series offers excellent impact resistance, low noise, and strong contamination resistance. The robust cast iron housing and precision-machined internal components ensure long-term reliable operation under harsh conditions, effectively reducing maintenance frequency and costs.

Application Areas

• Excavators: Hydraulic working systems for medium excavators (boom, arm, bucket, swing—multi-circuit supply)

• Wheel Loaders: Hydraulic working systems

• Dump Trucks: Hydraulic hoist systems

• Cranes: Truck-mounted and crawler crane hydraulic systems

• Construction Equipment: Bulldozers, motor graders, and other heavy equipment hydraulic systems

• Mining Machinery: Hydraulic power systems for mining equipment

• Agricultural Machinery: Large agricultural machinery hydraulic systems

Expert Maintenance Tips

1. Installation Precautions

• The CBGj Series is a uni-directional rotation pump—verify that the system’s required rotation direction matches the pump’s identification marking before installation. This model features right-hand (clockwise) rotation (viewed from shaft end).

• Ensure coaxial alignment between the pump and drive shaft. Direct drive methods that impose radial loads on the pump shaft (e.g., direct gears, belt pulleys) are strictly prohibited—use flexible couplings or shaft adapters.

• The pump must be securely mounted with reliable sealing. Position the pump so that the inlet port is below the oil level in the reservoir whenever possible.

• Verify mounting hole dimensions before installation.

2. Fluid Management

• Use anti-wear hydraulic oil; L-HM46 or equivalent viscosity is recommended for summer operation.

• System fluid must remain clean and free of contaminants. Regularly inspect fluid cleanliness.

• Operating temperature should be maintained at 10 – 65°C, with optimal range of 35 – 50°C.

• Prime the pump by filling the housing with hydraulic fluid through the suction port before initial start-up. Never run the pump dry.

3. Start-Up & Commissioning

• Use jog start method for initial start-up; verify correct rotation direction before continuous operation.

• Allow the pump to run under no-load (low pressure) conditions for 2-3 minutes to purge air and ensure proper lubrication.

• Gradually increase to operating pressure while monitoring noise, temperature, and system pressure for normal operation.

4. Routine Maintenance

• Replace hydraulic fluid every 1,000-2,000 operating hours or every six months.

• Regularly replace return line filters and suction strainers to prevent contaminant ingress into the pump body.

• Disassembly by the user is strictly prohibited—the manufacturer does not guarantee product performance if disassembled.