6E-6272 plunger pump For CAT D4H bulldozer

6E-6272 plunger pump For CAT D4H bulldozer Featured Image
  • 6E-6272 plunger pump For CAT D4H bulldozer

Short Description:

6E-6272 variable axial plunger pump is aftermarket replacement spare part for CAT D4H track-type bulldozer, compatible with D4H XL and D4HTSK.

Product Detail

Product Tags

description

6E-6272 axial variable piston pump serves as main hydraulic power unit for CAT D4H bulldozer, driven by engine. It converts mechanical power into adjustable high-pressure hydraulic energy for dozer blade, ripper and steering hydraulic systems. Built-in load sensing control valve dynamically changes pump displacement. During heavy soil cutting or hard ground pushing, pump increases flow to maintain blade adjustment speed; under light load or idle travel, it reduces displacement to save fuel and lower heat accumulation.
Internal plungers, cylinder block, valve plate and slipper assemblies are manufactured from high-strength alloy steel with precision grinding and surface hardening treatment. Cast iron pump housing adopts stress relief annealing to eliminate casting residual stress, resisting vibration and particle contamination on earthmoving sites.High-performance FKM fluorine rubber sealing assembly delivers reliable high temperature resistance and anti-aging property, reducing internal volumetric leakage and external oil seepage.

product parameters

Part No：6E-6272
Product Type：Variable Displacement Axial Piston Pump
Applicable Equipment：CAT D4H Track-type Bulldozer, compatible with D4H XL, D4HTSK
Control Mode：Load Sensing Swash Plate Control
Displacement：64 cc/rev
Nominal Working Pressure：29 MPa (290 bar)
Max Instantaneous Peak Pressure：34 MPa (340 bar)
Rated Rotation Speed：2200 rpm
Max Allowable Rotation Speed：2500 rpm
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
Working Temperature Range：-20℃ ~ +112℃
Main Material：Cast iron housing, high-strength alloy steel internal parts, FKM fluorine rubber seal
Surface Treatment：Precision grinding, surface hardening, stress relief annealing, anti-rust coating
Shaft Specification：Original standard splined shaft
Interchangeability：1:1 OEM interchangeable, direct bolt-on installation
Product Condition：Brand new aftermarket part, 100% hydraulic bench tested

advantage

- Load sensing curve optimized for continuous heavy dozer pushing and ripping
The load sensing response is tuned for bulldozer heavy-load working mode. It instantly boosts flow when blade meets hard soil, maintaining stable pushing force for long-distance earthmoving.
- Multi-circuit flow distribution supports simultaneous blade adjustment and ripper operation
Balanced flow supply enables blade lifting, tilting and ripper movement to run concurrently, improving efficiency for subgrade excavation and stripping projects.
- Reinforced friction pair for cyclic impact from continuous bulk earth pushing
Upgraded internal friction pair improves fatigue resistance under sustained heavy pushing load, extending service life in long-duration land development projects.
- Excellent static pressure holding prevents blade sinking during slope cutting
Reliable pressure retention keeps the blade position stable on slope grading, avoiding depth deviation during layered earth stripping.
- Optimized flow pulsation reduces hydraulic shock during frequent load changes
Refined internal flow path lowers pressure fluctuation when pushing resistance changes rapidly, protecting hydraulic cylinders and valves from impact damage.
- Continuous heavy pushing cycle bench test simulating large earthmoving project conditions
Each pump undergoes long-duration heavy pushing cycle test, verifying stable performance under continuous bulk earth cutting and stripping work.

FAQ 

Q1: Which machine does 6E-6272 plunger pump fit?
A1: This hydraulic plunger pump fits CAT D4H track-type bulldozer, also compatible with D4H XL and D4HTSK. Confirm machine serial number before purchase.

Q2: What hydraulic functions does this pump support?
A2: It provides high-pressure hydraulic oil for blade lift, blade tilt, ripper and steering system, completing earth pushing, slope cutting and land stripping tasks.

Q3: What are typical failure symptoms of worn pump?
A3: Typical symptoms: insufficient thrust on hard compacted soil, slow blade movement, blade drifts during static positioning, obvious temperature rise during long continuous pushing, pump abnormal noise and shaft seal oil leakage.

Q4: What inspections should be done before installing new pump?
A4: Inspect blade cylinders, ripper cylinder, main control valve and filter elements. Fully flush hydraulic tank and pipelines to remove metal debris. Replace degraded hydraulic oil before assembly.

Q5: Why bulldozer still lacks pushing power after pump replacement?
A5: The fault may not come from pump. Check relief valve calibration, stuck valve spool, clogged filter, damaged cylinder seals or trapped air inside hydraulic circuit. Air bleeding must be completed after installation.

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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Pack and ship

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