Gear Pump (2 holes, 13 teeth), Low Pressure Pump, Pilot Pump
1. Product Overview
This low-pressure pilot hydraulic gear pump adopts external meshing gear structure with 2 mounting holes and 13-tooth gear assembly. As an essential auxiliary power component of excavator hydraulic system, it supplies stable pilot pressure for operating joysticks, main control valve and hydraulic actuators. Strictly manufactured according to original installation dimensions, this pilot gear pump can directly replace OEM spare parts without modification. It is compatible with multiple excavator models including Takeuchi 135, Kobelco 135SR, Kobelco 200SR, Sumitomo 200-3 and Doosan 258. The product features compact layout, reliable sealing performance and strong anti-pollution capability, suitable for long-time continuous operation under complex construction conditions.
Model Feature Description
Low pressure pilot gear pump, structure: 2 holes, 13 teeth, dedicated for excavator pilot circuit.
2. Main Technical Parameters
Item Specification
Product Type External meshing hydraulic gear pilot pump
Structure Feature 2 mounting holes, 13-tooth gear set
Rated Working Pressure 3.5 ~ 5 MPa (low pressure pilot circuit)
Max Pressure 7 MPa
Rotation Speed 600 ~ 2600 rpm
Sealing Material NBR nitrile rubber, FKM optional
Applicable Fluid ISO VG46 anti-wear hydraulic oil
Operating Temperature -20℃ ~ +85℃
Application Circuit Excavator pilot control hydraulic system
Compatible Equipment Takeuchi 135, Kobelco 135SR, Kobelco 200SR, Sumitomo 200-3, Doosan 258
3. Working Principle
Driven by the main hydraulic pump or engine power take-off, the paired gears rotate inside the pump housing to generate vacuum suction and deliver low-pressure hydraulic oil to the pilot circuit of the hydraulic system. The pilot oil provides control pressure signal for multi-way valve spools, realizing remote control of boom, arm, bucket and slewing movements. Stable pilot pressure ensures sensitive and smooth operation of excavator control handles.
4. Core Advantages
1. Standard 2-hole 13-tooth structure, fully interchangeable with original pilot pump.
2. Optimized low-pressure design, stable output flow for pilot control loop.
3. Compact size, easy installation and replacement during equipment maintenance.
4. Low internal leakage, effectively avoiding slow response of control handles.
5. Good wear resistance, adapt to dusty construction site environment.
6. Cost-effective aftermarket spare part for excavator overhaul.
5. Application Range
This pilot gear pump serves as the pilot power source for the hydraulic system of Takeuchi 135, Kobelco 135SR, Kobelco 200SR, Sumitomo 200-3 and Doosan 258 excavators, widely used in municipal engineering, earthmoving and construction operations.
6. Common Faults & Replacement Suggestion
Typical failures: insufficient pilot pressure, sluggish joystick response, oil leakage from shaft seal, abnormal running noise. Replace the complete pilot gear pump assembly to recover normal operation of excavator control system.
