Product Overview
The BPV-35R belongs to the Linde BPV Series swashplate-type axial piston variable displacement pump family, designed for closed-loop hydrostatic transmission systems, with a displacement of 34.9 cm³/rev and nominal size 35. The BPV series covers five sizes from 35 to 200 (BPV35/50/70/100/200), with rated pressure of 420 bar (6090 psi), peak pressure reaching 500 bar (7250 psi), and permissible housing internal pressure of 1.5 bar—a compact medium-duty hydraulic pump suitable for hydrostatic travel drive systems in mobile machinery.
The BPV series pumps integrate all components required for closed-loop operation: integral auxiliary pump (optionally with internal or external suction), 10 μm full boost flow cartridge filter, high pressure relief valves, boost check valves, cold start valve (cooler protection), boost pressure relief valve, and short circuit device. All control components are integrated in the control cover, the drive shaft can absorb radial loads, the mounting flange is suitable for both DIN and SAE pitch circles, and SAE high pressure ports are standard—with clockwise or counterclockwise rotation available. Sizes 35, 50, 70, and 100 share an identical spigot mounting diameter, while sizes 35, 50, and 70 share an identical drive shaft diameter, greatly simplifying spare parts management and system integration.
The “R” in BPV-35R indicates right-hand (clockwise) rotation, viewed from the shaft end. The mounting flange, drive shaft, and port layout maintain 1:1 dimensional compatibility with original Linde BPV series pumps, enabling direct replacement without system modification or adapter plates. Every pump undergoes 100% simulated operating-condition testing before shipment, including rated pressure hold, flow characteristic verification, and control response validation—delivering immediate reliability upon installation.
Technical Specifications
Model Identification:
BPV-35R — Linde BPV series, nominal size 35, right-hand rotation (clockwise, viewed from shaft end), closed-circuit swashplate axial piston variable displacement pump
Displacement (BPV Full Series):
Pressure Ratings:
Rated pressure (max. working pressure): 420 bar (6090 psi)
Peak pressure: 500 bar (7250 psi)
Permissible housing internal pressure: 1.5 bar
Boost pressure: 16 bar
Speed Range (BPV35):
Speed Range (Full Series):
BPV50: max. speed 3200 rpm, peak speed 3500 rpm
BPV70: max. speed 3000 rpm, peak speed 3300 rpm
BPV100: max. speed 2800 rpm, peak speed 3100 rpm
BPV200: max. speed 2100 rpm, peak speed 2400 rpm
Auxiliary Pump Displacement (BPV Full Series):
Control Types:
Cam Control (KS) — with positive stretched neutral, for applications requiring precise neutral positioning
Hydraulic Remote Control (HF) — displacement and flow direction controlled via hydraulic pilot pressure
Electro-Hydraulic Control (EH) — electrical signal input controls hydraulic pilot for precise proportional control
Automotive Control (AU) — designed specifically for travel drives, integrating travel control logic
Torque Control (TC) — limits pump input torque to prevent prime mover overload
Optional pressure cut-off function available
Structural Parameters:
Pump type: Closed-circuit swashplate axial piston variable displacement
Design: BPV series, swashplate type
Mounting flange: Suitable for both DIN and SAE pitch circles
Drive shaft: Capable of absorbing radial loads
Rotation: Right-hand (clockwise) or left-hand (counterclockwise), viewed from shaft end
Port connections: SAE high pressure ports
Through-drive: Supported, for tandem pump configurations or PTO connection for auxiliary drives
Mounting position: Optional, any position
Housing material: Cast iron
Hydraulic Fluid and Operating Conditions:
Recommended fluid: Mineral oil-based anti-wear hydraulic oil
Optimal operating viscosity range: 10-39 cSt
Operating oil temperature range: -20°C to +90°C
Cleanliness requirement: ISO 4406 18/16/13 or better
Key Technical Advantages
1. 420 bar High-Pressure Capability with Compact Structure for High Power Density
The BPV series achieves 420 bar rated working pressure and 500 bar peak pressure at nominal size 35, with a maximum speed of 3400 rpm (continuous duty). The compact swashplate design delivers high power density within constrained installation spaces, and the permissible housing internal pressure of only 1.5 bar effectively reduces shaft seal loading and extends seal service life. Ideal for space-constrained mobile machinery hydraulic systems.
2. Integrated Closed-Loop Components Simplify System Design
The BPV series integrates all components required for closed-loop operation into a single unit: integral auxiliary pump, 10 μm full boost flow cartridge filter, high pressure relief valves, boost check valves, cold start valve, boost pressure relief valve, and short circuit device. This highly integrated design significantly reduces external piping and connections, lowers leak risk, and simplifies system design and installation.
3. Flexible Modular Control Options for Diverse Requirements
The BPV series offers five control types: cam control (KS), hydraulic remote control (HF), electro-hydraulic control (EH), automotive control (AU), and torque control (TC), each available with optional pressure cut-off. All control components are integrated in the control cover without external piping, improving system reliability and response speed. The modular control options enable the same pump body platform to adapt to different equipment control requirements.
4. Unified Mounting Interface Enables 100% Drop-in Interchange
BPV series sizes 35, 50, 70, and 100 share an identical spigot mounting diameter, while sizes 35, 50, and 70 share an identical drive shaft diameter. The mounting flange is suitable for both DIN and SAE pitch circles, with SAE standard high pressure ports. This standardized design enables the BPV-35R to directly bolt-replace original Linde BPV series pumps without piping modification or adapter plates, while reducing spare parts inventory variety and maintenance costs.
5. Radial Load-Capable Drive Shaft and Through-Drive Capability
The BPV series drive shaft can absorb radial loads, enhancing system layout flexibility and allowing additional drive elements to be mounted on the drive shaft. Through-drive supports tandem pump configurations and PTO auxiliary drive connections, enabling single power source operation of multi-circuit hydraulic systems. The high load capacity of the drive shaft and through-drive design make the BPV series an ideal choice for complex mobile machinery hydraulic systems.
Application Areas
Excavator travel drive systems (Liebherr and other small-to-medium excavators)
Wheel loader hydrostatic travel drive systems
Road roller travel drive systems (Hamm and other brands)
Tracked bulldozer travel drive systems (Liebherr PR series)
Mining drills and drilling equipment dynamic load hydraulic systems
Railway engineering machinery and rail vehicle hydrostatic drives
Marine deck machinery and material handling equipment hydraulic drives
Industrial hydraulic systems closed-circuit hydrostatic transmission
Expert Maintenance Tips
1. Pre-Installation Model Verification
Verify the complete model code on the pump nameplate before installation. The BPV-35R is configured for right-hand rotation (R code, clockwise, viewed from shaft end). Confirm the mounting flange type (DIN or SAE pitch circle) matches the equipment. Ensure drive shaft-to-coupling concentricity within 0.05 mm. Although BPV series drive shafts can absorb radial loads, excessive radial loads may still cause premature shaft seal failure. Install the pump such that the case drain port maintains oil level at or above the unit centerline.
2. Hydraulic Fluid and Cleanliness Requirements
Use mineral oil-based anti-wear hydraulic oil with optimal operating viscosity range of 10-39 cSt. Fluid cleanliness should be ISO 4406 18/16/13 or better. The BPV series includes an integrated 10 μm full boost flow cartridge filter, but a return line filter is still recommended to extend hydraulic fluid service life. Operating oil temperature range: -20°C to +90°C. Flush the system thoroughly before first operation to eliminate residual metallic particles.
3. Boost Pressure and Cold Start Check
The BPV series incorporates a built-in boost pressure relief valve set at 16 bar, providing replenishing and control pressure for the closed circuit. The cold start valve (cooler protection) automatically routes oil to bypass the cooler during cold starts, preventing excessive back pressure when cold oil passes through the cooler. Before starting in cold environments, confirm the cold start valve is functioning properly to avoid cooler damage.
4. First Start-Up Procedure
Before first start, confirm the suction line is properly sealed, the reservoir is at the correct level, and oil level is at or above the pump centerline. Run at low speed unloaded for 5-10 minutes to purge air. Confirm no suction line leakage and steady oil flow from the case drain line before gradually increasing speed and loading to rated conditions. For HF or EH control models, confirm the pilot pressure line is correctly connected before startup. The pressure cut-off setting (if equipped) should be adjusted according to equipment requirements.
5. Routine Maintenance
Replace hydraulic oil filters every 2,000 operating hours or annually. Periodically inspect the pump exterior for leaks and check the drive shaft spline and shaft seal for wear. The integrated 10 μm boost filter should be replaced according to Linde official maintenance intervals. If output flow decline, pressure instability, or sluggish control response is observed, prioritize inspection of the valve plate, piston-cylinder, and control system component wear. Recommended overhaul interval: no more than 8,000 operating hours or 5 years. Always use original or equivalent quality seals and filters during service.
