247-8968 10R-6278 Excavator 365B CCAT Hydraulic Pump Heavy Duty Replacement Assembly Component

The 247-8968 (superseding 10R-6278 reman designation) hydraulic pump is the implement power source for the CCAT 365B Excavator—a 65-ton class machine that was, at its introduction, CCAT's largest conventional excavator and remains in heavy production service across mining, quarrying, and mega-infrastructure projects globally. The 365B typically loads 50-70 ton rigid-frame haul trucks with 5.0-6.5 m³ buckets, requiring the 247-8968 pump to deliver sustained high flow at peak system pressure for shift-long durations with cycle times of 25-35 seconds. This pump operates at the extreme edge of gear pump capability in terms of displacement, pressure, and thermal loading, making material quality and manufacturing precision absolutely critical to achieving acceptable service life.

The 365B's defining hydraulic challenge is thermal management at scale. With a hydraulic system containing 600-700 liters of oil, the 247-8968 pump converts approximately 60-80 kW of mechanical power into hydraulic flow at the system's peak operating point, with roughly 15-20% of this energy (9-16 kW) lost as heat within the pump itself due to internal leakage and mechanical friction. In deep-pit mining operations where ambient temperatures regularly exceed 40°C (104°F), the pump case temperature can reach 110-115°C during sustained production loading—temperatures at which standard mineral hydraulic oil begins to thermally degrade (oxidation rate approximately doubles for every 10°C above 80°C). This thermal degradation produces varnish and sludge that deposits on the pump's internal surfaces, progressively restricting oil flow through the bearing lubrication grooves and causing localized hot spots. A 365B pump operating at 110°C case temperature has a typical service life of 4,000-5,000 hours, compared to 7,000-8,000 hours for the same pump design operating at 90°C—a 40-50% reduction driven entirely by thermal effects rather than mechanical wear. The most destructive secondary effect is varnish-induced sticking of the system's relief valve: when varnish deposits cause the relief valve spool to stick partially open, the pump must work against a continuous bypass leak path, generating additional heat in a self-reinforcing cycle that can escalate to catastrophic pump seizure within 50-100 hours.

The 247-8968 pump's extreme thermal loading is a direct consequence of its operating parameters. A 65-ton excavator performing truck loading in hard rock requires approximately 450-500 liters per minute of hydraulic flow at 3,200-3,500 PSI to cycle the boom, arm, and bucket through a full dig-swing-dump-return cycle in under 30 seconds. The pump's internal leakage—even at the normal 6-8% for a healthy pump—represents 30-40 L/min of oil recirculating internally and converting pressure energy to heat. This internal leakage heat generation is proportional to the product of leakage flow and pressure drop: at 3,500 PSI and 30 L/min leakage, approximately 12 kW of heat is generated inside the pump housing. The 365B's hydraulic oil cooler is sized for the system's average heat rejection requirement, not the pump-specific peak load—during continuous production loading, the cooler may be undersized by 15-20%, allowing the oil temperature to gradually rise over a 2-3 hour production stint. This thermal drift from 80°C to 105°C+ is the root cause of the accelerated service life reduction.

Our 247-8968 replacement pump implements a thermal-first design philosophy. The pump housing features external cooling fins cast integrally into the housing body—not bolt-on accessories but part of the casting itself—increasing the external surface area by approximately 35% and improving convective heat transfer to the engine compartment airflow. The internal pressure-balancing circuit has been redesigned with enlarged balance grooves (increased from the standard 1.5 mm width to 2.5 mm) in the pressure plates, which distribute the internal pressure field more evenly across the gear face and reduce the peak localized pressure that drives internal leakage. This groove redesign reduces internal leakage by approximately 15-20% at equivalent operating conditions, directly reducing the internal heat generation. The gear set undergoes cryogenic treatment (-185°C deep freeze followed by triple tempering), which refines the martensitic grain structure and increases thermal conductivity by approximately 8-10%—this seemingly small improvement allows the gear teeth to conduct heat away from the mesh point more efficiently, reducing the peak flash temperature at tooth contact from approximately 180°C to 165°C. Each pump is validated on a mining-duty thermal endurance test: 48 hours of continuous operation at 2,100 RPM and 3,500 PSI with the pump case temperature maintained at 105°C (±2°C) via external heating, with volumetric efficiency measured every 8 hours. The acceptance criterion is that efficiency must not degrade by more than 3% over the 48-hour test—a standard that validates the pump's ability to survive the thermal drift conditions typical of deep-pit mining operations.

• Integral Cast Cooling Fins: Housing cast with external fins increasing surface area by 35% for enhanced convective heat rejection, lowering steady-state case temperature by 5-8°C in high-ambient mining conditions.
• Enlarged Pressure Balance Grooves: Redesigned 2.5 mm balance grooves (vs. standard 1.5 mm) in pressure plates reduce internal leakage by 15-20%, directly lowering internal heat generation by approximately 2-3 kW at peak load.
• Cryo-Treated Gears with Enhanced Conductivity: Cryogenic processing refines grain structure, increasing thermal conductivity by 8-10% and reducing gear mesh flash temperature from 180°C to 165°C.
• 48-Hour Thermal Endurance Validation: Continuous mining-duty simulation at 105°C with efficiency measured every 8 hours—must maintain < 3% efficiency degradation across the full test to pass.
• Varnish-Resistant Internal Coatings: Internal housing surfaces coated with a low-surface-energy PTFE-based coating that inhibits varnish and sludge adhesion, maintaining unrestricted oil flow through lubrication passages at elevated temperatures.
• Heavy-Duty Coupling Interface: Pump drive coupling spline manufactured from 42CrMo4 alloy steel (HRC 38-42) with induction-hardened tooth flanks to withstand the 65-ton excavator's engine torque pulsations during bucket stall events.

The 247-8968 pump is purpose-designed for the CCAT 365B Excavator in these extreme-duty applications:

• Open-Pit Mining: Loading blasted overburden and ore into 50-70 ton rigid-frame haul trucks. Continuous production with 25-35 second cycle times, 50-55 cycles per hour, 10-12 hours per shift.
• Quarry Production Loading: Face loading shot rock (granite, basalt) with 5.0-6.5 m³ heavy-rock buckets. Bucket penetration forces exceeding 500 kN demand maximum pump flow at peak pressure.
• Mega-Infrastructure: Dam construction, canal excavation, and highway cut-and-fill projects requiring sustained high-volume earthmoving with minimal idle time.
• Heavy Lift: Precision lifting of structures, pipes, and precast concrete elements weighing 15-25 tons, requiring finely metered hydraulic flow for controlled positioning.

1. Verify 365B Model: The 247-8968 is specific to the 365B excavator (serial prefixes typically 9TZ, BTH, CTY, or PHE). Later 365C and 374-series machines use different pump configurations.
2. Check Cooler Condition: Given the 365B's thermal challenges, verify that your machine's hydraulic oil cooler is functioning at peak capacity. A partially clogged cooler (reduced airflow due to dust accumulation) can reduce cooling capacity by 30-40%, creating the thermal conditions that accelerate pump wear. Clean or replace the cooler when installing a new pump.
3. Oil Specification: For mining applications, we strongly recommend ISO VG 46 or VG 68 full-synthetic hydraulic oil with oxidation stability (TOST) rating > 5,000 hours. Standard mineral oil begins thermal degradation at the 365B's sustained operating temperatures.
4. 10R-6278 Comparison: The 10R-6278 CCAT Reman unit typically carries a core charge of USD 3,500-5,500 for this size class and 4-6 week lead time. Our 247-8968 new-production pump eliminates both the core charge and the lead time.

• Q: The 365B is known for running hot. Will your pump's cooling fins and efficiency improvements eliminate the need for an auxiliary oil cooler?
  A: The integral cooling fins and reduced internal leakage improve the pump's own thermal characteristics but do not eliminate the system's overall cooling requirement. Our pump generates approximately 2-3 kW less internal heat than a standard pump, which translates to a 5-8°C reduction in steady-state oil temperature. For 365B machines operating in ambient temperatures below 35°C, this may be sufficient to keep oil temperature within the acceptable range without an auxiliary cooler. For machines operating above 35°C ambient (desert mining), we still recommend an auxiliary oil cooler—but the reduced pump heat generation means a smaller, less expensive auxiliary cooler can be used. The most cost-effective solution is a thermostatically-controlled electric fan cooler in the 15-20 kW heat rejection range, which activates only when oil temperature exceeds 85°C and adds approximately USD 2,500-3,500 to the installation cost.
• Q: Our 365B operates at 3,800 meters altitude in a South American copper mine. How does altitude affect pump performance?
  A: High altitude affects the pump primarily through reduced atmospheric pressure at the hydraulic tank breather. At 3,800 m, atmospheric pressure is approximately 63 kPa (vs. 101 kPa at sea level), reducing the Net Positive Suction Head Available (NPSHA) by approximately 0.5 meters of oil column equivalent. This reduced inlet pressure increases the risk of cavitation, particularly during rapid function reversals when the pump inlet experiences momentary flow acceleration demands. For high-altitude operation, we recommend: (1) Pressurize the hydraulic tank to 0.3-0.5 bar (5-7 PSI) above ambient using a regulated compressed air supply through a desiccant dryer—this restores the NPSHA to near sea-level conditions. (2) Enlarge the pump suction line by one standard size (e.g., from 2.5 inch to 3 inch) to reduce inlet flow velocity. (3) Specify the high-altitude pump variant (add suffix "-HA" to your order) which includes a 10% larger suction port diameter. The 365B engine will also be derated at this altitude (approximately 1% power loss per 100 m above 1,500 m), so the pump's power demand must be weighed against available engine output.
• Q: What is your policy on supplying this pump for a 365B that has been repowered with a non-CCAT engine?
  A: Engine repowers are increasingly common on older 365B machines, particularly in markets where the original 3196 engine has been replaced with a  QSK19 or comparable diesel. The hydraulic pump interface is typically unaffected by an engine repower IF the repower kit maintains the original PTO pad SAE size and drive ratio. Before ordering, verify: (1) The PTO pad is SAE #1 or SAE #0 size with the correct pilot diameter for the pump mounting flange. (2) The PTO drive ratio matches the pump's rated speed range (typically 1:1 for the 365B). (3) The coupling type (flexible vs. rigid) is compatible with the pump's drive spline. If the repower used a non-standard PTO adapter, we can machine a custom mounting flange—provide the PTO bolt circle diameter, pilot diameter, and coupling type, and our engineering team will verify compatibility within 24 hours. No additional charge for standard SAE PTO compatibility verification.

Each 247-8968 pump is crated in a heavy-duty 20 mm export-grade plywood case with CNC-machined high-density polyurethane foam inserts that provide full-surface support for the pump's 45-55 kg mass. The pump is vacuum-sealed in 250-micron multi-layer VCI barrier film with dual humidity indicators and desiccant pouches. All ports are sealed with heavy-duty tamper-evident caps. External document pouch contains: serial-numbered quality certificate, 48-hour mining-duty thermal endurance test report with efficiency measurements at 8-hour intervals, CMM dimensional verification, and comprehensive installation manual specific to the 365B platform. Five-year digital traceability with 24/7 technical support for mining emergency breakdowns.