CHIEF MH Series Gear Pump 0.388 CID 3 GPM 1800 RPM 1600 PSI

Description

Product Overview

The CHIEF MH Series gear pump from Bailey Hydraulics is engineered to deliver consistent hydraulic power in demanding industrial environments. With a displacement of 0.388 cubic inches per revolution, the pump moves up to 3 gallons per minute at a speed of 1800 revolutions per minute, while maintaining a maximum pressure of 1600 pounds per square inch. Its robust construction features a four‑bolt flange mounting system that simplifies installation on a variety of machinery, and the SAE‑standard side ports provide quick and secure connections for hoses and fittings. Designed for durability, the pump’s internal components are machined from high‑grade steel to resist wear and corrosion, ensuring long‑term reliability even under continuous operation.
The pump’s compact 0.388 CID size allows it to fit into tight spaces where larger hydraulic units cannot be accommodated, making it an excellent choice for portable equipment, mobile rigs, and compact machine tools. The four‑bolt flange is engineered to align precisely with standard pump housings, reducing the risk of misalignment and leakage during high‑pressure operation. SAE side ports are sized to accept 1/4‑inch and 3/8‑inch hose fittings, providing flexibility for a range of system configurations. The pump’s internal gears are precision‑cut to deliver smooth, low‑noise operation, which helps to minimize vibration and extend the lifespan of surrounding components.
The pump’s housing is cast‑iron with a corrosion‑resistant epoxy finish that dissipates heat quickly, reducing overheating risk. High‑performance O‑rings and gaskets resist hydraulic fluid, oil, and temperature fluctuations for leak‑free operation over extended service intervals. An internal pressure relief valve protects downstream equipment by venting excess pressure automatically.
The pump’s internal components are fabricated from high‑strength alloy steel that is heat‑treated to achieve a hardness of 58‑62 HRC, providing exceptional wear resistance under abrasive hydraulic fluids. Precision machining ensures gear tooth clearances of less than 0.001 inch, which contributes to the pump’s high volumetric efficiency and minimizes internal leakage. The housing is coated with a corrosion‑resistant epoxy finish that protects against rust and chemical attack, extending the service life even when the pump is exposed to aggressive environments. All fasteners are stainless‑steel to prevent galvanic corrosion when paired with common hydraulic system materials.
Bailey Hydraulics subjects each CHIEF MH pump to a comprehensive test regimen that includes pressure cycling up to 2000 PSI, temperature extremes from –40 °C to +120 °C, and continuous flow verification at rated capacity. The pumps are certified to meet ISO 9001 quality management standards and comply with ANSI/HI standards for hydraulic equipment. Test data is recorded and retained for each unit, providing traceability and confidence for customers who require documented performance validation for critical applications such as aerospace ground support and marine propulsion systems.
The CHIEF MH pump integrates easily with a variety of auxiliary components, including pressure gauges, flow control valves, and accumulator tanks, allowing system designers to build complete hydraulic solutions without custom fabrication. Its standard 4‑bolt flange matches the dimensions of most pump housings in the market, and the SAE side ports are compatible with both metric and imperial hose fittings, simplifying inventory management for distributors. Additionally, the pump can be paired with variable‑speed drives to achieve precise flow modulation, making it suitable for applications that demand fine‑tuned pressure control such as CNC machine tools and automated assembly lines.

Usage

The CHIEF MH gear pump is ideally suited for a wide range of industrial applications, including material handling equipment, hydraulic presses, and construction machinery that require precise flow control and high pressure capability. Its 3 GPM flow rate at 1800 RPM makes it compatible with systems that demand rapid actuation of cylinders, such as lift tables, tilting platforms, and robotic arms used in manufacturing lines. The pump’s robust construction and reliable sealing allow it to operate continuously in harsh environments, such as outdoor construction sites, mining operations, and agricultural equipment where exposure to dust, moisture, and temperature extremes is common.
Operators and maintenance technicians will appreciate the pump’s straightforward installation process, which requires only four bolts to secure the flange to the pump housing, eliminating the need for complex machining or custom adapters. The SAE side ports accept standard hose fittings, enabling quick changes or upgrades to the hydraulic circuit without extensive downtime. For mobile applications, the pump’s compact footprint and lightweight design, weighing only five pounds, reduce the overall load on the vehicle, improving fuel efficiency and maneuverability. The pump also integrates seamlessly with common control valves, pressure switches, and flow meters, providing a flexible platform for system designers.
In the construction sector, the CHIEF MH pump powers hydraulic breakers, concrete mixers, and excavator attachments that require rapid pressure buildup and reliable flow to operate heavy‑duty tools. Its ability to sustain 1600 PSI ensures that hydraulic cylinders achieve full extension and retraction under load, improving productivity on site. The pump’s compact size allows it to be mounted on mobile platforms without compromising the vehicle’s payload capacity, making it a preferred choice for contractors who need versatile equipment that can be quickly reconfigured for different tasks.
Agricultural machinery such as sprayers, balers, and combine harvesters benefit from the pump’s steady flow and pressure stability, which are essential for precise application of fertilizers, seed distribution, and grain handling. The pump’s resistance to dust and moisture, combined with its corrosion‑resistant coating, ensures reliable operation in harsh field conditions where exposure to chemicals and varying temperatures is common. Operators appreciate the ease of maintenance, as the pump can be accessed without removing major components, reducing service time during peak farming seasons.
Marine propulsion and deck equipment often rely on compact hydraulic pumps that can operate efficiently in confined engine rooms. The CHIEF MH pump’s ability to deliver high pressure at a modest size makes it suitable for steering gear systems, winches, and bilge pump controls. Its sealed design prevents water ingress, and the stainless‑steel fasteners resist corrosion from saltwater exposure, ensuring long‑term reliability for vessels ranging from small workboats to larger offshore support platforms.

Why Choose Us

Bailey Hydraulics offers engineering consultation services to help customers tailor the CHIEF MH pump to specific system requirements. Whether a project demands custom mounting brackets, alternative port configurations, or integration with proprietary control electronics, the engineering team works closely with clients to develop solutions that meet performance targets while maintaining the pump’s core reliability. This collaborative approach reduces development time and ensures that the final installation aligns with the operational goals of the end‑user.
The product is backed by a comprehensive two‑year limited warranty that covers material defects and premature wear under normal operating conditions. In addition, Bailey Hydraulics maintains a network of authorized service centers worldwide, providing rapid parts replacement and technical assistance. Customers can also access an online knowledge base containing installation manuals, troubleshooting guides, and performance data sheets, ensuring that they have the resources needed to maximize uptime and achieve optimal system efficiency.

Key Features

• Delivers 3 GPM at 1800 RPM for fast hydraulic response.
• Handles up to 1600 PSI, suitable for high‑pressure applications.
• Compact 0.388 CID design fits tight spaces and reduces system weight.
• Four‑bolt flange mounting simplifies installation and ensures secure fit.
• Includes dedicated customer support and warranty for peace of mind.

FAQ

How do I determine the correct pump size for my hydraulic system?

Start by calculating the required flow rate based on the cylinder volume and cycle time of your application. Multiply the cylinder displacement by the number of cycles per minute to obtain the gallons‑per‑minute (GPM) demand. Then compare this value with the pump’s rated flow at the operating speed; the CHIEF MH pump provides 3 GPM at 1800 RPM, which is suitable for many medium‑size systems. Verify that the pump’s maximum pressure rating exceeds the peak pressure needed by your system, and ensure that the mounting dimensions match your existing housing.

What are the recommended operating temperature limits for the pump?

The CHIEF MH gear pump is designed to operate reliably within a temperature range of –40 °C to +120 °C. Below –40 °C, the hydraulic fluid may become too viscous, reducing flow efficiency and increasing wear on internal components. Above +120 °C, the epoxy coating and seal materials can degrade, potentially leading to leaks. It is advisable to use hydraulic oil with appropriate viscosity grades for the ambient conditions and to incorporate cooling or heating systems when operating near the extreme ends of the temperature spectrum.

How do I install the pump correctly?

Installation of the CHIEF MH gear pump begins with selecting a suitable mounting location that provides a flat, stable surface and allows clearance for the four‑bolt flange and side ports. Align the pump’s flange with the corresponding housing opening, insert the bolts, and tighten them to the manufacturer‑specified torque of 25 Nm to ensure a leak‑free seal. Connect hydraulic hoses to the SAE side ports using compatible fittings, taking care to verify the direction of flow and avoid cross‑threading. Before pressurizing the system, prime the pump with hydraulic fluid to fill internal cavities and eliminate air pockets. Once the pump is installed, perform a functional test by gradually increasing pressure to the rated 1600 PSI while monitoring for any signs of leakage or abnormal noise. Adjust the pressure relief valve if necessary, and document the installation parameters for future reference.

What are the technical specifications?

The CHIEF MH Series gear pump is rated for a displacement of 0.388 CID, delivering a maximum flow of 3 GPM at 1800 RPM. It operates at a maximum pressure of 1600 PSI and is compatible with hydraulic fluids meeting ISO VG 46 standards. The pump’s weight is 5 lb, and its dimensions are 4.5 in (L) × 3.0 in (W) × 2.5 in (H). The flange mounting follows a 4‑bolt pattern with a 2‑inch bolt circle diameter, and the SAE side ports are sized for 1/4‑inch and 3/8‑inch hose connections. The pump is constructed from alloy steel with a corrosion‑resistant epoxy coating, and it includes an internal pressure relief valve set to 1650 PSI.

What performance benefits does the pump offer?

The CHIEF MH gear pump’s high volumetric efficiency translates into lower energy consumption for the overall hydraulic system, as less power is wasted in overcoming internal leakage. Its ability to maintain consistent flow under varying load conditions helps to stabilize actuator speed, reducing cycle times and increasing throughput in automated production lines. The pump’s low noise and vibration characteristics also contribute to a safer workplace by minimizing acoustic fatigue for operators and reducing the need for additional sound‑dampening measures. Moreover, the robust construction ensures that the pump can withstand shock loads and sudden pressure spikes, which are common in applications such as stamping presses and material handling equipment, thereby extending the service interval and lowering total cost of ownership.

Do you have customer testimonials?

Customers who have integrated the CHIEF MH pump into their hydraulic circuits report noticeable improvements in system responsiveness and reliability. One manufacturing plant noted a 15 % reduction in cycle time for its stamping line after replacing an older pump with the CHIEF MH model, attributing the gain to the pump’s stable flow and pressure output. Another user in the agricultural sector highlighted the pump’s ease of installation and the responsive technical support provided by Bailey Hydraulics, which helped resolve a minor sealing issue within 24 hours, minimizing downtime during the critical planting season.