Product Overview

The ROCKEFELLER 46# Anti-Wear Hydraulic Oil is a professional-grade hydraulic fluid specifically formulated for the high-pressure, high-demand hydraulic systems that power modern construction machinery. Hydraulic systems are the operational heart of virtually all construction equipment — they generate the tremendous forces that move excavator booms, arms, and buckets; they lift and position crane loads; they steer and brake wheel loaders; they extend and retract concrete pump booms; they power the hammers, shears, crushers, and grapples that make hydraulic equipment so versatile and productive.

The “46#” designation refers to the oil’s ISO viscosity grade 46 (ISO VG 46), meaning the oil has a kinematic viscosity of approximately 46 centistokes (cSt) at 40°C. ISO VG 46 is the single most widely used hydraulic oil viscosity grade in the world — it is specified by the majority of hydraulic component manufacturers (pumps, motors, valves, cylinders) as the standard operating viscosity for medium-to-high-pressure hydraulic systems operating at normal ambient temperatures (approximately 0°C to 40°C). This makes the 46# the essential, highest-volume hydraulic oil product for any distributor serving the construction equipment market.

The “Anti-Wear” (AW) classification is critical for construction machinery hydraulic systems because these systems operate at high pressures (200–350+ bar) that create extreme contact stresses within hydraulic pumps — the most expensive and wear-sensitive components in the hydraulic circuit. The 46# incorporates advanced anti-wear additive technology based on zinc dialkyldithiophosphate (ZDDP) and supplementary anti-wear compounds that form protective tribofilms on pump internal surfaces, dramatically reducing wear and extending pump service life.

The 46# is formulated for compatibility with the hydraulic systems and components of major equipment manufacturers from the United States, Europe, and Japan — including Caterpillar, John Deere, Case/CNH, Komatsu, Hitachi, Kobelco, Kubota, Volvo CE, Liebherr, Bosch Rexroth, Parker Hannifin, Eaton, Kawasaki, KYB, and all other major hydraulic component suppliers.

The 46# is manufactured to international quality standards with a five-year shelf life and is available in 18-liter buckets and 208-liter drums.

Key Functional Features and Performance Benefits

Wear Resistance

★ Excellent Wear Resistance — Effectively Reduce Wear of Hydraulic Pumps:
The hydraulic pump is the most critical and most expensive component in a construction machinery hydraulic system. A single main hydraulic pump for a medium excavator costs $3,000–$15,000, and large machines may have two or three main pumps plus additional auxiliary pumps. Pump wear directly reduces hydraulic system efficiency (the pump can no longer deliver full flow at full pressure), which reduces machine productivity, increases fuel consumption, and ultimately requires expensive pump rebuild or replacement.

The three primary types of hydraulic pumps used in construction machinery are:

Axial Piston Pumps (Most Common in Medium/Large Equipment):
These pumps use a rotating barrel with multiple pistons that reciprocate against a swashplate (variable displacement) or port plate (fixed displacement). Critical wear interfaces include:

• Piston to bore clearance: Pistons sliding within cylinder bores must maintain extremely tight clearances (typically 5–20 microns) while moving at high speeds. Excessive wear increases internal leakage, reducing volumetric efficiency.
• Slipper pad to swashplate: The slipper pads at the base of each piston ride on the swashplate surface under high loads. Wear at this interface causes loss of hydrostatic bearing support.
• Port plate (valve plate): The rotating cylinder barrel face slides against the stationary port plate, creating a thin-film hydrodynamic bearing. This interface handles both high pressures and high sliding velocities.

Gear Pumps (Common in Smaller Equipment and Auxiliary Circuits):
Internal and external gear pumps experience wear at the gear tooth tips, gear faces, and housing bore surfaces. The 46#’s anti-wear system protects all of these interfaces.

Vane Pumps (Common in Specific Applications):
Vane pumps experience wear at the vane tips against the cam ring, and at the vane sides against the body plates. The 46# provides targeted protection for these surfaces.

The 46#’s ZDDP-based anti-wear system forms a durable, self-repairing tribofilm on all of these critical pump surfaces. This film:

• Reduces metal-to-metal contact during boundary lubrication conditions (startup, high load, high temperature)
• Maintains pump volumetric efficiency by preserving critical internal clearances
• Extends pump service life from the typical 6,000–10,000 hours achievable with basic hydraulic oils to 10,000–15,000+ hours
• Reduces the frequency and cost of pump rebuilds and replacements

Oxidation and Corrosion Protection

★ Excellent Anti-Oxidation Stability, Anti-Rust, and Anti-Corrosion — Extend Oil Change Cycle and Reduce Maintenance Costs:
Hydraulic oil in construction machinery is subjected to severe oxidative stress due to:

• High operating temperatures: Hydraulic systems routinely operate at 60–90°C, with temperature spikes exceeding 100°C during heavy operation
• High pressures: Repeated compression and expansion of the oil accelerates thermal breakdown
• Catalytic metals: Copper alloys in hydraulic fittings, bushings, and cooler tubes catalyze oxidation reactions
• Contamination: Water, dust, and wear debris entering the system accelerate oil degradation

The 46#’s anti-oxidation additive system employs a multi-layer approach:

• Primary antioxidants (radical scavengers): Interrupt the chain reaction of oxidation at the molecular level
• Secondary antioxidants (peroxide decomposers): Destroy the peroxide intermediates that would otherwise propagate oxidation
• Metal deactivators: Passivate the catalytic metal surfaces (particularly copper) that accelerate oil degradation

This comprehensive anti-oxidation system dramatically extends the oil’s useful service life, enabling longer intervals between oil changes:

• Typical mineral hydraulic oil change interval: 2,000–3,000 hours
• ROCKEFELLER 46# recommended change interval: 3,000–5,000+ hours (depending on operating conditions, filtration, and oil analysis results)

The economic benefit is substantial: for a fleet of 50 excavators, extending the hydraulic oil change interval by 1,000 hours saves approximately 100+ oil changes per year, representing significant savings in oil cost ($50,000+), filter cost, labor, machine downtime, and waste oil disposal.

The anti-rust and anti-corrosion additives protect all hydraulic system metals — including steel (cylinders, rods, shafts), cast iron (pump housings, valve bodies), aluminum (manifolds, pump cases), copper/bronze (bushings, fittings, cooler tubes), and chrome (cylinder rods) — from rust and corrosion caused by moisture contamination and acidic oil degradation products.

Air Management

★ Good Anti-Foam and Air Release — Maintain Hydraulic System Efficiency and Responsiveness:
Air in hydraulic oil causes serious problems for construction machinery operation:

Foam (Surface Air):
Foam is a visible mass of air bubbles on the oil surface in the reservoir. It is caused by mechanical agitation of the oil (return flow turbulence, pump cavitation, air leaks at connections) and is stabilized by surface-active contaminants. Foam reduces the effective oil volume in the reservoir, can be drawn into the pump suction (causing cavitation and damage), and impairs heat transfer (oil cannot dissipate heat efficiently when it is mixed with air).

Entrained Air (Dispersed Air):
Entrained air consists of small air bubbles dispersed throughout the oil volume. It is more damaging than surface foam because:

• It causes cavitation damage when air bubbles pass through the high-pressure zone of the pump, collapsing violently and eroding metal surfaces
• It makes the hydraulic system compressible (air is ~20,000 times more compressible than oil), causing spongy, imprecise control of cylinders and motors — the operator experiences sluggish response, jerky movements, and reduced precision
• It increases noise and vibration as air bubbles compress and expand within pumps, valves, and cylinders
• It accelerates oxidation by exposing the oil to large internal air surfaces at high temperatures and pressures

The 46#’s anti-foam additives break surface foam rapidly, preventing foam accumulation in the reservoir. The air release additives promote the rapid separation of entrained air bubbles from the oil, allowing them to rise to the surface and escape. Together, these additives ensure:

• Clean, air-free oil delivery to hydraulic pumps
• Crisp, precise control of hydraulic actuators
• Reduced pump cavitation and noise
• Extended pump and component service life
• Proper heat transfer for system temperature management

Seal Compatibility

★ Good Rubber Adaptability — Effectively Protect Sealing Materials and Prevent Leakage:
Construction machinery hydraulic systems contain hundreds of seals — O-rings, lip seals, piston seals, rod seals, wiper seals, backup rings, and gaskets — made from various elastomeric materials:

• NBR (Nitrile/Buna-N): The most common seal material in hydraulic systems, used for standard temperature applications
• FKM (Viton): Used for high-temperature and aggressive fluid applications
• PTFE (Teflon): Used for high-pressure rod seals and backup rings
• Polyurethane: Used for piston seals and wiper seals in cylinders
• HNBR (Hydrogenated Nitrile): Used for enhanced temperature and wear resistance

The 46# is formulated for excellent compatibility with all of these seal materials, meaning it does not cause:

• Excessive swelling: Which would increase friction, reduce clearances, and cause seal extrusion
• Shrinkage: Which would create gaps allowing oil to leak past the seal
• Hardening: Which would make the seal brittle and prone to cracking
• Softening: Which would reduce the seal’s ability to withstand pressure

This seal compatibility is critical because hydraulic oil leaks on construction machinery:

• Create slip hazards and environmental contamination on job sites
• Reduce hydraulic system pressure and performance
• Consume expensive oil that must be replaced
• Can cause fires if oil contacts hot exhaust components
• Violate environmental regulations and can result in significant fines
• Reduce machine resale value

Technical Specifications

Parameter	46# AW Hydraulic Oil
ISO Viscosity Grade	ISO VG 46
Oil Type	Anti-Wear (AW) Hydraulic Oil
Application Focus	Construction Machinery
Anti-Wear System	ZDDP + Supplementary AW
Kinematic Viscosity @ 40°C	~46 cSt (nominal)
Anti-Oxidation Stability	Excellent
Rust Protection	Excellent (Steel, Cast Iron, Copper)
Corrosion Protection	Excellent (Multi-Metal)
Anti-Foam	Good
Air Release	Good
Seal Compatibility	NBR, FKM, PTFE, PU, HNBR
Filterability	Excellent
Water Separation	Good
Compatible Standards	DIN 51524 Part 2 HLP, ISO 11158 HM, Vickers I-286-S, Eaton (Vickers), Denison HF-0, Parker Hannifin, Bosch Rexroth
Available Packaging	18L Bucket, 208L Drum
Shelf Life	5 Years

Application Areas and Compatible Vehicles/Equipment

Excavators (Highest Volume Application)

Hydraulic excavators are the single largest consumers of hydraulic oil in the construction equipment industry. A medium excavator (20–30 ton) holds approximately 200–350 liters of hydraulic oil; a large excavator (40–80+ ton) holds 400–900+ liters; and mining-class excavators (100+ ton) hold 1,000–2,000+ liters.

• Caterpillar: 300 series (301.5–395), Next Generation line
• Komatsu: PC series (PC18–PC2000), Intelligent Machine Control (iMC) line
• Volvo CE: EC series (EC140–EC950)
• Hitachi: ZX series (ZX30–ZX890)
• Kobelco: SK series (SK30–SK850)
• SANY: SY series (SY16–SY980H)
• XCMG: XE series (XE15–XE900)
• Liugong: CLG series (CLG9035–CLG970)
• Doosan: DX series (DX27–DX800)
• Hyundai: HX/R series (HX55–HX900)
• Case: CX series (CX17–CX800)
• Lonking: CDM series (CDM6065–CDM6365)
• Liebherr: R series (R914–R9800)
• JCB: JS series (JS130–JS370), 220X
• Chinese Budget Brands: Sunward, Yuchai, Lovol, Hengte, Jingong, Xiagong, Bonny, Jonyang, Zoomlion (excavator range)

Wheel Loaders

• Caterpillar 900 series (906–994); Komatsu WA series (WA100–WA1200); Volvo L series (L20–L350); SDLG LG series; Liugong CLG series; XCMG LW/ZL series; Lonking CDM series; Doosan DL series; Hyundai HL series; Case 21/121/221/321/521/621/721/821/921/1021/1121/1221; JCB 403–457 series; Shantui SL series; Chenggong CG series; Lovol FL series

Cranes

• Mobile Cranes: Liebherr LTM/LTF/LTC; Tadano ATF/GR/GT; Manitowoc GMK/RT; Zoomlion QAY/QUY/RT series; SANY SAC/SPC/SRC/SCC series; XCMG QY/QAY/XCA/XCT series; Terex AC/RT; Link-Belt; Grove GMK/TMS/RT
• Crawler Cranes: Liebherr LR/HS; Kobelco CKE/CKS; Hitachi-Sumitomo SCX; Manitowoc; SANY SCC series; XCMG XGC series; Zoomlion ZCC series; Fuwa QUY series
• Tower Cranes: All brands — Liebherr, Potain (Manitowoc), Comansa, Jaso, XCMG, Zoomlion, SANY, Yongmao, Fushun, SCM

Concrete Equipment

• Concrete Pump Trucks: SANY, Zoomlion, XCMG, Putzmeister (SANY), Schwing (XCMG), Junjin, CIFA, Liebherr
• Truck Mixers: Hydraulic drum drive systems on all brands
• Concrete Batching Plants: Hydraulic systems in aggregate handling, cement distribution, and mixer systems

Road Construction Equipment

• Asphalt Pavers: BOMAG, Vögele (Wirtgen/Deere), Caterpillar, Dynapac, SANY, XCMG, Liugong, XRMC
• Road Rollers/Compactors: BOMAG, Hamm (Wirtgen/Deere), Caterpillar, Dynapac, SANY, XCMG, Liugong, Shantui, Luoyang Lutong, XGMA
• Milling Machines: Wirtgen, Caterpillar, SANY, XCMG
• Slipform Pavers: GOMACO, Power Curbers, Wirtgen/Vögele

Mining Equipment

• Hydraulic Mining Shovels: Caterpillar 6015/6020/6040/6060; Komatsu PC2000/PC3000/PC4000/PC5500/PC7000/PC8000; Hitachi EX2600/EX3600/EX5600/EX8000; Liebherr R9100/R9150/R9200/R9250/R9350/R9400/R9800
• Haul Trucks (Hydraulic Systems): Steering, braking, suspension, and body hoist hydraulic systems on all haul truck brands
• Drilling Rigs: Atlas Copco/Epiroc, Sandvik, Caterpillar, SANY, XCMG — rotary drill and DTH drill hydraulic systems
• Underground Equipment: LHD units, haul trucks, drill jumbos, bolters, continuous miners

Agricultural Equipment

• Tractor Hydraulic Systems: Where separate hydraulic fluid is specified (not shared with transmission), particularly for external hydraulic remotes, front loaders, and auxiliary circuits
• Combine Harvesters: Hydraulic drive and control systems
• Self-Propelled Sprayers and Forage Harvesters: Hydrostatic drive and implement control systems

Industrial Hydraulic Applications

• Hydraulic Presses: Metal forming, stamping, molding, and compaction presses
• Injection Molding Machines: Hydraulic-driven plastic injection molding equipment
• Machine Tools: CNC lathes, milling machines, grinding machines, and other hydraulic-assisted machine tools
• Steel Mills and Rolling Mills: Hydraulic systems for roll positioning, material handling, and process control
• Port Equipment: Ship-to-shore cranes, RTG cranes, reach stackers, container handlers — all contain extensive hydraulic systems

Target Customers and B2B Solutions

Construction Equipment Dealers and Service Centers:
Authorized dealers and independent service centers for all major equipment brands are the primary B2B customers for construction machinery hydraulic oil. A typical mid-size Caterpillar or Komatsu dealer consumes 50,000–200,000+ liters of hydraulic oil annually. The 46# provides these dealers with a high-quality, OEM-compatible product at competitive pricing.

Construction Contractors and Equipment Fleet Operators:
Large and medium construction companies operating fleets of excavators, loaders, cranes, and other hydraulic equipment are the end-users driving the highest volume demand. These companies typically maintain on-site bulk storage (1,000–10,000+ liter tanks) and consume hydraulic oil continuously during operations. The 46# is available in 208L drums and can be delivered in bulk for large-volume requirements.

Mining Companies:
Mining operations consume enormous volumes of hydraulic oil — a single mining-class excavator (200+ ton) requires 1,500–2,000 liters per fill, and with regular maintenance intervals and top-ups, annual consumption per machine can exceed 4,000–6,000 liters. A mid-size mine operating 10–20 large hydraulic machines may consume 100,000+ liters of hydraulic oil annually.

Equipment Rental Companies:
Companies renting construction equipment must maintain machines in top condition to maximize availability and minimize repair costs. The 46# provides the premium protection that keeps rental machines productive and reliable.

Hydraulic Equipment Manufacturers and Repair Shops:
Companies manufacturing or rebuilding hydraulic pumps, motors, cylinders, and valves require high-quality hydraulic oil for testing, flushing, and filling completed units. The 46# meets the quality requirements of all major hydraulic component test standards.

Why Choose 46# Anti-Wear Hydraulic Oil for Your Business?

1. ISO VG 46 — The World’s Most Widely Specified Hydraulic Oil Grade — covers the broadest range of construction equipment and industrial applications
2. Advanced Anti-Wear System — effectively protects high-pressure piston, gear, and vane pumps from costly wear
3. Excellent Oxidation Stability — enables extended oil change intervals that reduce costs and downtime
4. Comprehensive Corrosion Protection — guards all system metals against rust and corrosion from moisture contamination
5. Good Air Management — anti-foam and air release properties maintain system responsiveness and precision
6. Full Seal Compatibility — prevents the hydraulic leaks that cause environmental contamination and machine downtime
7. Compatible with Major OEMs — meets the hydraulic oil requirements of US, European, and Japanese equipment manufacturers
8. Highest-Volume SKU — the single product that generates the greatest sales volume in any construction equipment lubricant portfolio
9. Available in Bulk — 18L buckets, 208L drums, and bulk delivery for large-volume customers
10. 5-Year Shelf Life — supports strategic inventory management and global distribution