CM26.5 hydraulic fan motor For Hyundai R485 excavator

product parameters

Part No：31Q4-30201（CM26.5）
Type：Fixed Displacement Piston Hydraulic Fan Motor
Displacement：26.5 cc/rev
Applicable Equipment：Hyundai R485LC-9, R485LC-9T Excavator
Material：Ductile iron housing, alloy steel piston & rotor assembly, tin-bronze bearing, FKM fluorine rubber sealing rings
Surface Treatment：Black oxidation anti-rust treatment, ultrasonic internal cavity cleaning, thoroughly remove casting sand, metal scraps and burrs inside flow channel
Control Method：Hydraulic drive, rotation speed changes with inlet hydraulic flow
Rated Working Pressure：24 MPa
Max Instantaneous Peak Pressure：30 MPa
Feature：CM26.5 compact piston motor structure, stable torque output, low speed fluctuation, low internal leakage, strong anti-pollution ability, direct OEM replacement, specially designed fan motor for Hyundai R485 series excavator cooling system
Working Temperature：-25℃ ~ +115℃
Package：Independent anti-rust vacuum packing + Standard export carton
Storage suggestion：Keep dry, avoid moisture, rust and collision, indoor constant temperature storage, stay away from corrosive gas

• **Precision ground piston & rotor assembly, low speed fluctuation and high transmission efficiency**
Alloy steel piston and rotor assembly adopts high-precision grinding process and optimized fit clearance. It delivers steady torque under variable load conditions. Low volumetric leakage reduces power loss and improves overall cooling system efficiency of the excavator.
• **Robust ductile iron housing with stress relief treatment, excellent impact and vibration resistance**
Ductile iron housing after stress relief annealing eliminates internal residual stress. It can cope with frequent vibration and heavy torque impact on quarry and construction sites. The housing is not easy to deform, slowing down wear of internal piston and bearing components and extending service life.
• **Optimized internal flow path and upgraded FKM sealing assembly, good anti-cavitation & high temperature resistance**
Redesigned internal flow channel reduces oil turbulence and cavitation risk. FKM seal set delivers outstanding high-temperature and hydraulic oil aging resistance. It tolerates minor impurities in hydraulic oil and effectively prevents particle jamming, abnormal noise and premature component wear, minimizing unexpected machine downtime.
• **Reliable hydraulic torque output to protect engine and radiator against thermal overload damage**
This CM26.5 fixed displacement fan motor provides stable rotary power for cooling fan. It maintains engine cooling system operating within optimal temperature range, preventing radiator and engine thermal fatigue damage caused by sustained high temperature, ideal replacement for overhaul and daily maintenance of Hyundai R485 series excavators.

FAQ 

Q1: What is the difference between CM26.5 fan motor for R485 and the fan motor on R385?
A1: CM26.5 is 26.5cc displacement for R485LC-9/R485LC-9T. R385 fan motor adopts different displacement and mounting hole layout. They cannot be interchanged. Always confirm part number before ordering.

Q2: What check items are required before installing CM26.5 fan motor?
A2: Check the fan pump output flow and pressure, inspect hydraulic oil cleanliness, check fan blade for deformation or crack. Bent fan blade will create unbalanced load and damage the new motor quickly.

Q3: What causes the fan to vibrate heavily after CM26.5 motor replacement?
A3: Main reasons: fan blade imbalance, spline shaft fit clearance too large, loose mounting bolts, or motor internal bearing damage. Stop operation immediately for inspection.

Q4: Can this CM26.5 fan motor work with variable fan pump?
A4: Yes, it can be matched with the original variable fan pump of R485 excavator, and realize fan speed adjustment according to engine coolant temperature.

Q5: What maintenance suggestions for CM26.5 fan motor in long-term operation?
A5: Replace hydraulic oil and filter on schedule, keep oil cleanliness at NAS8 level or better. Check shaft seal leakage and fan blade balance every 2000 working hours.

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