31QB-30130 hydraulic fan gear pump For Hyundai R485 excavator

product parameters

Part No：31QB-30130
Type：Double Gear Hydraulic Fan Pump
Applicable Equipment：Hyundai R385LC-9, R485LC-9, R520LC-9 Excavator
Material：High-strength cast aluminum housing, alloy steel gear pair, tin-bronze bearing, FKM fluorine rubber sealing rings
Surface Treatment：Precision machining, deburring, anti-corrosion coating
Drive Method：Engine direct drive
Rated Working Pressure：25 MPa
Max Instantaneous Peak Pressure：31 MPa
Feature：Compact dual gear design, stable flow output, low internal leakage, strong wear resistance, direct OEM replacement, matched with CM26.5 fan motor for Hyundai R485 cooling system
Working Temperature：-25℃ ~ +115℃
Rated Rotation Speed：2200 rpm, Max allowable speed:3000 rpm
Package：Independent anti-rust packing + Standard export carton
Storage suggestion：Keep dry, avoid moisture, rust and collision, indoor constant temperature storage, stay away from corrosive gas

• **Lightweight high-rigidity cast aluminum housing with stress relief treatment, excellent anti-vibration performance**
Cast aluminum housing after stress relief annealing eliminates internal residual stress. It can resist continuous vibration and pressure impact in quarry sites. The housing is not easy to deform, slowing down wear of internal gear and bearing components and extending service life.
• **Optimized flow channel structure and upgraded FKM sealing assembly, good anti-leakage & high temperature resistance**
Optimized internal flow path reduces oil turbulence and cavitation risk. FKM seal set delivers outstanding high-temperature and hydraulic oil aging resistance. It effectively prevents internal and external oil leakage, avoiding premature component wear caused by oil contamination, minimizing unexpected machine downtime.
• **Full hydraulic bench inspection before delivery, high interchangeability for direct plug-and-play replacement**
Each 31QB-30130 fan pump passes flow, pressure and durability hydraulic bench test. All mounting dimensions, port positions and spline shaft fully match OEM specifications. Direct installation without modification, shortening equipment downtime and cutting maintenance cost.
• **Reliable hydraulic power supply to protect engine and cooling hydraulic system**
This double gear fan pump provides stable pressurized oil for CM26.5 fan motor. It maintains cooling hydraulic system operating normally, preventing engine thermal damage caused by insufficient fan power, ideal replacement for overhaul and daily maintenance of Hyundai R485 series excavators.

FAQ 

Q1: Can 31QB-30130 fan pump be used separately with other brand fan motors?
A1: It is originally matched with CM26.5 fan motor (31Q4-30201) for Hyundai R485. If matched with other motors, the flow and pressure parameters need to be recalculated, improper matching will cause overheating or early damage.

Q2: What inspection items are required before installing this fan pump?
A2: Check the cleanliness of hydraulic oil, inspect the fan motor for seizure or heavy internal leakage. A stuck fan motor will create overload and damage the pump gear quickly after installation.

Q3: What causes low fan speed after replacing the 31QB-30130 fan pump?
A3: Common reasons: insufficient pump inlet oil supply, air trapped in hydraulic circuit, internal leakage of fan motor, or clogged hydraulic filter. Check oil circuit and pressure step by step.

Q4: What is the difference between 31QB-30130 fan pump and 31Q4-30201 fan motor?
A4: 31QB-30130 is the fan pump (hydraulic power source), which generates pressure oil. 31Q4-30201 CM26.5 is fan motor (actuator), using pressure oil to drive fan rotation. They are a matched set for R485 cooling system.

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