157-6081 plunger pump For Caterpillar D5N, D5N XL, D5N LGP bulldozer

Short Description:

157-6081 variable axial plunger pump is heavy-duty hydraulic replacement for Caterpillar D5N, D5N XL, D5N LGP bulldozer with 3126B engine. It adopts swash plate load sensing control structure to deliver adjustable high-pressure hydraulic oil for blade and tilt hydraulic circuits.

Product Detail

Product Tags

description

157-6081 axial variable piston pump acts as the core hydraulic power source of Caterpillar D5N series bulldozers. Driven by engine, it converts mechanical energy into high-pressure hydraulic energy, supplying variable flow and pressure for blade lifting, tilt movement and hydraulic actuators. The built-in swash plate load-sensing control mechanism dynamically adjusts pump displacement according to load changes under no-load, light-load and heavy-load conditions, realizing precise power matching and reducing redundant power consumption. Core components are made of high-strength alloy steel. Plungers, cylinder block, valve plate and sliding shoes undergo precision grinding and nitriding hardening treatment for excellent wear and fatigue resistance, suitable for repeated pushing and earthmoving cycles. Thickened cast iron pump housing adopts stress-relief annealing to eliminate internal stress, resisting cyclic pressure shock and strong vibration, avoiding pump deformation and cracking.

product parameters

Part No：157-6081
Product Type：Variable Displacement Axial Piston Pump
Applicable Equipment：CAT D5N, D5N XL, D5N LGP Bulldozer, 3126B Engine
Control Mode：Swash Plate Load Sensing Control
Displacement：45 cc/rev
Nominal Working Pressure：28 MPa (280 bar)
Max Allowable Rotation Speed：2600 rpm
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
Working Temperature Range：-25℃ ~ +110℃
Main Material：High-density cast iron housing, high-strength alloy steel core components, FKM fluorine rubber seal
Surface Treatment：Precision grinding, nitriding hardening, stress relief annealing, anti-rust coating
Shaft Specification：Original standard splined shaft
Interchangeability：1:1 OEM original interchangeable, direct installation without modification
Product Condition：Brand new aftermarket part, 100% hydraulic bench tested

advantage

  • 1:1 OEM full interchange, zero modification installation Manufactured strictly according to CAT D5N bulldozer OEM drawings. All mounting holes, oil ports and spline shaft dimensions match 157-6081. Direct bolt-on replacement without pipeline modification, cutting downtime and maintenance cost.
  • Nitrided alloy steel friction pairs, superior wear resistance & long service life Plunger, cylinder block, valve plate and sliding shoe use high-strength alloy steel with deep nitriding and precision grinding. High hardness and anti-fatigue performance maintain stable volumetric efficiency under frequent heavy-duty cycles and reduce internal leakage.
  • Load sensing swash plate control, energy-saving & optimized power matching High-precision swash plate mechanism automatically adjusts displacement following load changes. Low power output at light load to save fuel; higher flow & pressure for heavy dozing, reducing engine power waste.
  • Thickened cast iron pump body, strong impact resistance for earthwork sites Thick high-density cast iron housing with stress-relief annealing. It withstands continuous vibration and cyclic pressure shocks on construction sites, preventing pump deformation and cracking.

FAQ 

Q1: Which CAT equipment fits 157-6081 plunger pump?
A1: This main hydraulic pump is designed for CAT D5N, D5N XL, D5N LGP bulldozers with 3126B engine. Not compatible with D6N/D7N and other series. Please verify machine model and part number before ordering.

Q2: Can this pump replace main pump for D5M dozer?
A2: No. 157-6081 has different installation size and control parameters, it cannot interchange with D5M hydraulic pumps.

Q3: What faults appear when the 157-6081 pump wears out?
A3: Typical symptoms: slow blade movement, insufficient pushing force, system pressure drop, unstable hydraulic pressure, pump abnormal noise and vibration, or continuous hydraulic overheating in severe cases.

Q4: Can I install this plunger pump directly without modification?
A4: Yes. All mounting dimensions, oil ports and spline shaft match OEM. Direct bolt-on installation, no cutting or welding required, simplifying maintenance.

Q5: What pre-installation work is needed to extend pump service life?
A5: Replace hydraulic oil and filters, flush tank and pipelines to remove metal debris. Inspect valve block and tilt cylinders. Bleed air fully after installation to avoid cavitation damage.

warehouse

We have built four spare parts warehouses in Xuzhou, Jining, Kunshan and Changsha to provide customers from all over the world with a variety of high-quality spare parts. We can basically ship self-provided spare parts within three days after confirming the order. If the spare parts need to be adjusted or processed, they will be shipped within 7-30 days.

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