Description
CAT 399-8559 ROLLER-EJCTR-GD
| CAT 399-8559 ROLLER-EJCTR-GD |
| CAT 527-7486 BEARING-SLV-GD |
| CAT 373-5706 BUSH |
| CAT 116-7478 SLEEVE-WEAR |
| CAT 471-1976 BEARING-SLEE |
| CAT 380-7377 BEARING-SLV-GD |
| CAT 581-8952 BEARING-SELF-GD |
| CAT 469-1378 BEARING |
The CAT 399-8559 YM is a Caterpillar original double-acting piston hydraulic cylinder assembly (compatible with loader booms/sticks for linear drive in heavy-duty conditions). The following is the original data and does not include information on replacement parts.
Core Technical Parameters (Raw Data)
Item Details
Basic Attributes
Model 399-8559 YM, type is double-acting single-rod piston hydraulic cylinder, cylinder barrel is 45 seamless steel pipe, piston rod is 40Cr chrome-plated (plating thickness 0.05-0.08 mm), piston is ductile iron (QT500-7), end cap is cast steel (ZG35), single weight 68.5 kg, working temperature -40℃ to +100℃, compatible with mineral oil/synthetic hydraulic oil (ISO VG 46), rated pressure 35 MPa, test pressure 42 MPa, burst pressure 85 MPa, volumetric efficiency ≥98%, mechanical efficiency ≥95%
Key Dimensions
Cylinder diameter 160 mm (6.299 in), rod diameter 100 mm (3.937 in), stroke 1420 mm (55.906 in), cylinder outer diameter 194 mm mm, piston rod chrome plating hardness HV≥800, cylinder inner diameter tolerance H9, rod diameter tolerance f7, stroke tolerance ±1.5 mm, oil port specification M36×2 (P/T port), installation distance (ear center distance) 1650 mm, ear hole diameter 60 mm, ear thickness 35 mm, end buffer stroke 25 mm. Compatible Models and Parts: Compatible with Cat 966M/972M loader boom lifting cylinder (left/right, 1 piece per side), 980K loader stick cylinder, used to drive boom lifting and stick retraction, bearing heavy loads and impact loads, ensuring operational stability and operational accuracy.
Performance Parameters: Maximum thrust 631 kN (64.3 tons), maximum pulling force 314 kN (32.0 tons), buffer pressure 0.8-1.2 MPa, sealing material is polyurethane (PU)/ Nitrile butadiene rubber (NBR), guide sleeve made of bronze (ZCuSn10Pb1), piston seal a combination of Glyd ring and O-ring, piston rod seal a combination of Stirling ring and dust ring, minimum starting pressure ≤0.3 MPa.
Structural and Performance Advantages:
Dual-acting design: Enables bidirectional power output, adaptable to boom/stick lifting and retraction movements, meeting the complex operation requirements of construction machinery.
Chrome-plated piston rod: High hardness and wear resistance, corrosion resistance, reduces seal wear, extends cylinder service life, suitable for harsh working conditions.
Combined sealing system: Glyd ring + Stirling ring + dust ring combination, excellent sealing performance, suitable for high-pressure, high-frequency reciprocating motion, reducing leakage risk.
Buffer device: Built-in buffer structures at both ends reduce piston reversal impact, lower noise, and protect the cylinder and related components.
Installation and Maintenance Points (Original Data)
Installation: Clean the cylinder and mounting base, tighten with bolts (M30×2, torque 850 N・m), ensuring the clevis coaxiality ≤0.2 mm and the piston rod parallelism to the load ≤0.5 mm/m. After installation, vent the air (loosen the vent valve on the branch line) to prevent cavitation.
Maintenance: Check oil level and quality every 500 hours; replace seals every 2000 hours; check cylinder bore wear every 5000 hours (wear ≤0.15 mm); maintain oil temperature between 30-60℃; avoid overpressure operation.
Troubleshooting: For leaks, check seals and cylinder/piston rod wear; for insufficient thrust, check hydraulic oil pressure and leaks; for stuck operation, check venting and guide sleeve wear, replace damaged parts promptly, and troubleshoot hydraulic system problems.
