VOE 11707966 Volvo A35D Hydraulic Piston Pump 250 Bar

Product Overview

Technical Specifications

• Cross Reference Part Numbers: VOE 11707966, VOE 11707970, VOE 11117046 (Volvo OEM replacement)
• Pump Type: Variable displacement swash-plate axial piston pump for open circuit load-sensing hydraulic systems
• Geometric Rated Displacement:
  • Main working pump specification (11707966/11707970): 71 cm³/r
  • Steering/auxiliary pump specification (11117046): 45 cm³/r
• Rated Continuous Working Pressure: 250 bar (25 MPa, aligned with original system relief setting)
• Peak Intermittent Working Pressure: 315 bar
• Rated Operating Speed: 2200 rpm (matched to engine PTO rated output speed)
• Maximum Allowable Speed: 2850 rpm
• Rated Flow:
  • 71 cm³/r specification: 156.2 L/min (@2200 rpm, at full displacement)
  • 45 cm³/r specification: 99 L/min (@2200 rpm, at full displacement)
• Control Mode: Load Sensing + Pressure Compensation compound control
• Shaft Extension: Standard spline shaft, matching original power input interface
• Mounting Flange: SAE standard mounting flange for full direct interchangeability
• Housing Material: One-piece high-strength gray cast iron
• Reference Weight: Approx. 33 kg (71 cm³/r specification), approx. 21 kg (45 cm³/r specification)
• Main Seal Material: FKM fluororubber
• Compatible Fluid: ISO VG46 high-quality anti-wear hydraulic oil
• Operating Oil Temperature Range: -20℃ to 90℃
• Compatible Machines: Volvo A25D, A30D, A35D, A40D, T450D Articulated Haulers

Key Technical Advantages

1. OEM-grade Dimensional Replication & 100% Direct Damage-free Interchangeability

   Core friction pairs including cylinder block, valve plate and slipper are processed with CNC honing and super-finish grinding, with dimensional tolerance controlled at micron level. The mounting flange, shaft parameters, port positions and control ports fully replicate Volvo original drawing standards, enabling direct replacement of original pumps of the same model without modifying mounting brackets, connecting pipelines or control oil circuits. It achieves original performance level immediately after installation, greatly reducing maintenance labor and retrofitting costs.

2. Load Sensing Variable Control for Energy Saving and High Efficiency

   The dual variable mechanism of load sensing and pressure compensation precisely adjusts displacement and pressure according to the real-time load demand of actuators such as hoist and steering, outputting hydraulic power on demand and eliminating energy loss and oil temperature rise caused by unnecessary overflow. Compared with fixed displacement pump systems, it reduces hydraulic energy consumption by more than 18%, effectively improving vehicle fuel economy and adapting to long-time continuous operation in mining and construction scenarios.

3. Heavy-Duty Material Configuration for Impact Resistance and Long Service Life

   The drive shaft is made of high-strength alloy structural steel with carburizing and quenching treatment, reaching surface hardness of HRC58-62, withstanding torsion and impact loads during vehicle startup and on bumpy roads. The valve pair adopts a high-strength cast iron and copper alloy matching scheme with outstanding wear resistance, withstanding pressure shocks caused by frequent reversing. Paired with high-precision heavy-duty rolling bearings, it effectively prolongs the service life of the pump under high-vibration and high-dust working conditions, with mean time between failures exceeding industry standards.

4. Full Working Condition Factory Testing for Stable and Reliable Performance

   Each pump passes 100% simulated bench test before delivery, covering multiple inspection items such as rated pressure holding, peak pressure shock, high and low speed cycle, oil temperature rise verification, internal leakage detection and control response test. The one-piece high-strength cast iron housing delivers strong vibration and impact resistance, operating stably within a wide temperature range of -20℃ to 90℃ and in dusty field environments, and effectively reducing on-site failure risks.

5. Optimized Flow Channel Low-noise Design for Heavy Duty Conditions

   The internal oil channel is optimized by computational fluid dynamics design to reduce hydraulic shock and cavitation noise. The kidney-shaped groove of the valve plate adopts a buffer damping structure to reduce pressure pulsation during high-low pressure chamber switching, controlling operating noise below 82dB. It also has a built-in pressure overload buffer mechanism to absorb instantaneous pressure shocks during hoist lowering, protecting the pump body and downstream hydraulic valve blocks and hoist cylinders.

Application Areas

• Mining operations: Articulated haulers for earthwork transfer, ore stripping and transportation in open-pit metal mines and coal mines
• Infrastructure construction: Engineering vehicles for earthwork transfer, site grading and muck transportation in large-scale highway and water conservancy projects
• Municipal sanitation: Articulated engineering trucks for urban infrastructure construction, pipeline excavation and construction waste removal
• Forestry & agriculture: Engineering equipment for log transportation in forest areas, land consolidation and material transportation in large-scale reclamation projects
• Ports and yards: Engineering transport vehicles for bulk cargo transfer, yard material handling and wharf construction in port yards

Expert Maintenance Tips

1. Installation Calibration and Air Exhaust Specifications

   Ensure the coaxiality error between the pump shaft and power output shaft is ≤0.1mm during installation, to avoid premature wear of shaft seal and bearing caused by excessive radial force. The pump must be installed with the case drain port at the highest position. The drain line must be independently connected back to the oil tank and must not be connected in series with the return line. Fill the pump housing with clean hydraulic oil and exhaust internal air before first startup to avoid dry friction damage to the valve pair and slippers.

2. Hydraulic Oil and Cleanliness Requirements

   Use high-quality anti-wear hydraulic oil compliant with ISO VG46 standard, with oil cleanliness reaching NAS grade 8 or above. The system return filter accuracy shall not be lower than 10μm. Ensure the suction pipeline is perfectly sealed, and suction vacuum degree shall not exceed 0.8 bar to avoid air intake and cavitation, which would cause early pitting of valve plate and cylinder block. Normal operating oil temperature should be controlled between 30℃ and 70℃; long-term operation above 90℃ will accelerate seal aging and oil deterioration, and the cooling system operation status shall be checked under high-temperature working conditions.

3. Regular Maintenance Interval

   Check oil level and cleanliness every 500 working hours, inspect pipeline leakage and loose connections, and clean the suction filter. Replace hydraulic oil and return filter every 2000 working hours, and clean tank bottom deposits at the same time. It is recommended to disassemble and inspect the wear condition of internal friction pairs, check bearing clearance and control spool flexibility every 4000 working hours to predict failure risks in advance.

4. Common Troubleshooting Key Points

   If output pressure is insufficient, first check whether the suction filter is clogged or the system relief valve setting is too low, then inspect whether the load sensing control spool is stuck or the valve pair is worn. If abnormal noise and vibration occur, focus on checking whether oil is aerated, bearing is worn, or installation coaxiality exceeds the standard. If the housing temperature rises abnormally, check whether the drain line is blocked or internal leakage is excessive. Do not operate the pump with oil shortage or air intake for a long time, to avoid irreversible damage to the pump body.