Dynamic Dave #003 – Introduction to Hydraulic Motors

Dynamic Dave #003 – Introduction to Hydraulic Motors

Hydraulic motors play a crucial role in various applications, powering everything from water pumps to Bobcat loaders. In this blog post, we’ll delve into the fascinating world of hydraulic motors, examining different types and shedding light on key considerations for optimal performance and longevity.

Gear Motors in Action:

Let’s begin our exploration with the ubiquitous gear motor. Often found in airseeders, these motors are easily identifiable by the equal-sized ports on both sides. A distinctive feature is the acasedrain on the back cover, a common component in hydraulic motor setups. The blog post explains the importance of a run-on check assembly to prevent fast braking actions that could damage the motor during sudden oil flow stoppages.

Bent Axis Piston Motors:

Moving on, the blog introduces the bent axis piston motor, a fixed displacement motor with similar principles to the gear motor. This section emphasizes the necessity of case drains, especially when connecting motors in series. The post also educates readers on displacement values, using an 11.8 cc motor as an example.

Wheel Motors: Girola and Agerotor Motors:

The spotlight then shifts to wheel motors, specifically the girola motor commonly found in front-end loaders like Bobcats. A girola motor, illustrated through a disassembled example, showcases the intricate components and the importance of proper maintenance. The blog touches on the potential issues that arise when side loads are applied to the shaft, emphasizing the need for outrigger bearing assemblies.

Failure Analysis and System Pressures:

The post provides insights into hydraulic motor failures, explaining the common occurrence of broken components, such as the dog bone, during complete motor stoppages. It emphasizes the significance of understanding system pressures and selecting appropriate relief mechanisms to protect hydraulic motors from damage.

Choosing the Right Motor for the Job:

The final sections of the post guide readers on selecting the right hydraulic motor for their applications. Differentiating between motor types based on speed capabilities and system pressures is highlighted. Practical advice is given for customers visiting hydraulic shops, encouraging them to inquire about relief mechanisms to safeguard their machinery.


In conclusion, this blog post serves as a comprehensive guide to the diverse world of hydraulic motors. From gear motors to bent axis piston motors and wheel motors, readers gain valuable insights into the intricacies of these essential components. Understanding the importance of maintenance, system pressures, and relief mechanisms will empower individuals to make informed decisions and ensure the longevity of their hydraulic systems. For further expertise and support, the post encourages readers to seek assistance from specialists like BJ Hydraulics, who can minimize downtime and expenses associated with hydraulic system issues.

Dynamic Dave #003 – BJ Hydraulics’ Impressive Product Ranges – From Mighty Motors to High-Performance Seal Kits!

Dynamic Dave #003 – BJ Hydraulics’ Impressive Product Ranges – From Mighty Motors to High-Performance Seal Kits!

In the heart of hydraulic innovation lies BJ Hydraulics, a hub of diverse hydraulic motors that cater to a plethora of industrial needs. In this comprehensive exploration, we unveil the array of hydraulic motors available at BJ Hydraulics, each designed for specific applications, ensuring optimal functionality and efficiency.

Geroler Motors:

Among the remarkable offerings is the Geroler motor, specifically the 2000 series Char-Lynn motor. Widely utilized in applications spanning feed lots, cotton industry root pullers, and grain crop harvesting, these motors stand as a testament to enduring efficiency and adaptability.

For header belt drives and similar applications, the H series Char-Lynn motor takes center stage. Its versatility and reliability make it a staple in various industrial setups, ensuring seamless operations even in demanding environments.

Gear Motors:

For cost-effective solutions without compromising performance, Gear motors come to the forefront. These basic yet robust motors offer an excellent balance between functionality and affordability, making them ideal for tasks that don’t demand high loads.

High-Torque Hydraulic Motors:

When the need for sheer power arises, BJ Hydraulics offers heavy-duty hydraulic motors, boasting up to 160 cc capacity. These motors find their place in applications requiring substantial torque, ensuring that even the most challenging tasks are accomplished with ease.

High-Speed Bent Axis Piston Motors:

In the realm of fixed displacement motors, the high-speed bent axis piston motor reigns supreme. Its single-speed configuration guarantees reliability and stability, making it indispensable in scenarios where consistency is paramount.

Radial Piston Style Motors:

For applications demanding extreme torque, the radial piston style motor steps in. Whether propelling ground drive wheel motors or gracing the fronts of powerful machines like bobcats, these motors provide the force needed to tackle the toughest challenges.


Beyond the remarkable array of motors, BJ Hydraulics ensures comprehensive support by offering an extensive range of seal kits. From renowned brands like Danfoss, Char-Lynnn, Eaton, to Parker, the availability of diverse seal kits underscores the commitment to providing tailored solutions for every need.

At BJ Hydraulics, the quest is not merely about selling hydraulic motors; it’s about understanding your unique requirements and matching them with the most suitable, high-quality, and cost-effective solutions. The team’s expertise, combined with the diverse range of motors and accessories, empowers industries to achieve unparalleled efficiency and performance.

In every application, BJ Hydraulics stands as a beacon of innovation, bridging the gap between industrial demands and hydraulic excellence. Experience the power of precision, reliability, and affordability – experience the BJ Hydraulics advantage.

Dynamic Dave #002 – Hydraulics In The Field: Western Star Hoist Checks

Dynamic Dave #002 – Hydraulics In The Field: Western Star Hoist Checks

As planting season approaches, our focus shifts not just to the fields but also to the machinery that will make it all happen. Today, we took a closer look at our trusty Western Star Truck, specifically around the hoist area. While it might seem like a simple inspection, it’s these small checks that ensure our hauling process, especially when laden with essential seeds and fertilizers, goes off without a hitch.

Hoist Inspection:

Our inspection started with a glance at the hoist, a component that plays a pivotal role during planting time. What immediately caught our attention was the telltale sign of a leak. The outer surface of the hoist was damp, indicating an issue that needed addressing. Taking a closer look inside the hoist well, we found more evidence of wear and tear. Dust and grime clung to the interior, a clear indicator that the top stage was experiencing excessive wear. This wear not only causes external leaks but also disrupts the smooth operation of the hoist, leading to chattering as it moves up and down.

Seal Condition and Repairs:

Assessing the condition of the seals, we realized they were far from optimal. While resealing the hoist stages might be a solution, a definitive decision could only be made after removing the hoist from the truck. Examining the stages closely, especially the wear at the seal points, would determine the viability of resealing or the need for a replacement. It’s an intricate process that ensures the hoist operates seamlessly, crucial when transporting heavy loads during planting season.

Beyond the Surface:

During our inspection, we didn’t just stop at oil leaks. A keen eye revealed a cracked resting plate that supported the hoist on both sides. This unexpected find emphasized the importance of looking beyond the obvious issues. In the world of machinery, one problem can often lead to another, making thorough inspections vital.

Diverter Valve Service:

Moving on, we examined the diverter valve, a component that enables oil transfer between the front hoist and the trailer’s hoist. A visible leak indicated that it needed attention. Fortunately, this was a relatively simple fix involving the replacement of a few o-rings. Addressing this issue promptly would prevent potential oil wastage and ensure the smooth functioning of the hydraulic system.


In conclusion, our Western Star Truck, while reliable, needed a bit of attention before the planting season kicked in. Addressing the hoist issues, the cracked resting plate, and the diverter valve promptly ensures that when the time comes, our truck will be ready to bear the load efficiently and effortlessly. As farmers, these preemptive checks are our way of guaranteeing a seamless planting experience, allowing us to focus on what truly matters: nurturing our crops and ensuring a fruitful harvest come autumn. With these inspections, we’re not just maintaining a truck; we’re upholding a promise of productivity and efficiency on our farm.

Dynamic Dave #001 – Hydraulics In The Field: Pre Season Checks – Boss Planter

Dynamic Dave #001 – Hydraulics In The Field: Pre Season Checks – Boss Planter

Spring is on the horizon, and for farmers, it marks the beginning of a new planting season. As the weather warms and the fields come back to life, it’s crucial to ensure that all our equipment is in top-notch condition. Today, we took a detailed look at our boss planter, conducting a meticulous visual inspection to identify any potential issues before we hit the fields.

Inspecting the Shaft Seal Area:

Our inspection started with a close examination of the shaft seal area. We were particularly concerned about oil leakages around the shaft seal and fittings inside the cylinder. What we discovered was a concerning oil leakage due to a failed o-ring inside the coupling. This issue was promptly identified as a Parker brining problem, emphasizing the importance of regular maintenance.

Checking the Breakaway Coupling:

Moving on, we inspected the wear on the breakaway coupling. The tip showed signs of significant wear and tear, indicating that it needed replacement along with the o-ring. Addressing this issue promptly is crucial to prevent further damage and maintain the planter’s efficiency.

Cylinder Inspection:

We then examined the fall cylinders, looking for any signs of wear or damage. Cracks in the wiper seal were our main concern, as they could lead to hydraulic issues. Fortunately, the cylinders seemed to be in good condition, but we noted the importance of keeping an eye on them throughout the season.

High Pressure Line and Hydraulic Hoses:

Our inspection extended to the high pressure line of the air setter fan motor. We observed damage to the coupling and identified weeping issues due to old and deteriorating hoses. Replacing these components before the season starts is crucial to prevent unexpected breakdowns during operation.

Shaft Condition:

Additionally, we checked the condition of the shafts, ensuring that the chrome surface was smooth and free of any marks that could damage the cylinder seals. A small preventive measure like this can go a long way in preventing leaks and prolonging the equipment’s lifespan.

Fan Motor Examination:

A critical part of our inspection was the fan motor. We noticed moisture and wetness around the coupling, indicating a failing shaft seal. Addressing this issue before the planting season is essential, as a malfunctioning fan motor can significantly disrupt the planting process.


In summary, our boss planter is in fair condition, thanks to our comprehensive inspection. While the cylinders seem ready for the upcoming season, we have highlighted concerns around the fan motor and a few hoses that need urgent replacement. By addressing these issues promptly, we are ensuring a smooth and efficient planting season ahead.

Regular inspections and proactive maintenance are the backbone of a successful farming operation. As we gear up for the spring season, these checks serve as a reminder of the importance of vigilance and attention to detail. With a well-maintained planter, we are poised for a productive and prosperous planting season, ready to sow the seeds for a bountiful harvest in the months to come.