The gear pump in a Komatsu PC35MR‑2 excavator (often functioning as the pilot or auxiliary pump) plays a critical role within the hydraulic system. It’s distinct from the main variable‑displacement piston pump, but it’s essential for supporting overall performance. Here are five key functions of this gear pump:
1. Generates Hydraulic Pressure for Pilot Circuits
The gear pump pressurizes oil for the pilot control system (i.e., the circuits that manage hydraulic valves and controls). It ensures responsive actuator control, enabling smooth operation of the machine’s functions. (loadermarket.com, HuParts.pt)
2. Provides Fixed, Steady Flow
As a fixed-displacement pump, each gear rotation delivers a precise volume of fluid. This consistent flow is crucial for reliable hydraulic control and stable system response. (Wikipedia)
3. Durable and Simple Design
Gear pumps feature a straightforward construction with rugged gears in a casing—making them cost-efficient, easy to maintain, and capable of withstanding harsh excavator operating conditions. (LinkedIn, swingbearing)
4. Supplies Auxiliary Hydraulic Functions
Typically, the gear pump handles auxiliary functions such as swing or blade operations. It supports systems that don’t demand the high precision or variable flow of the main piston pump but still require dependable hydraulic pressure. (swingbearing, HuParts.pt)
5. Compact and Resistant to Contamination
These pumps are compact—ideal for installation in confined excavator layouts—and are more tolerant to hydraulic fluid contaminants than more precise alternatives, increasing overall reliability. (LinkedIn, Miami University)
Summary Table
| Function | Description |
|---|---|
| Pressure Generation for Pilot Systems | Powers control valves and pilot actuators using pressurized fluid |
| Fixed Flow Output | Delivers consistent fluid volume with each rotation, enabling stable control |
| Robust Construction | Simple, durable design suited for tough working environments |
| Auxiliary Function Supply | Supports swing, blade, and other auxiliary systems |
| Compact & Contamination-Tolerant | Space-efficient and reliable even with less-than-clean fluids |
Let me know if you’d like to dive into how this integrates with other hydraulic components like the LS valve, PC valve, or the merge-divider system in the PC35MR‑2!
