9T-6857 (0R-4218)/4T-6895 plunger pump For cat CAT416/CAT428 backhoe loader

9T-6857 (0R-4218)/4T-6895 plunger pump For cat CAT416/CAT428 backhoe loader Featured Image
  • 9T-6857 (0R-4218)/4T-6895 plunger pump For cat CAT416/CAT428 backhoe loader

Short Description:

104-1752 (0R-7669) variable axial plunger pump is aftermarket replacement part for CAT D9R bulldozer. It supplies high-pressure hydraulic oil for blade lift, blade tilt, ripper and steering circuits.

Product Detail

Product Tags

description

9T-6857(0R-4218)/4T-6895 axial variable piston pump serves as main hydraulic power unit for CAT416/428 backhoe loader, driven by engine. It converts mechanical power into adjustable high-pressure hydraulic energy for front loader, rear backhoe and steering hydraulic systems. Built-in load sensing control valve dynamically changes pump displacement. During heavy backhoe digging or front bucket loading, pump increases flow to maintain working 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. Compact cast iron housing adopts stress relief annealing to eliminate casting residual stress, resisting vibration and particle contamination on construction 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：9T-6857（Cross ref:0R-4218），4T-6895
Product Type：Variable Displacement Axial Piston Pump
Applicable Equipment：CAT416, CAT428 Backhoe Loader
Control Mode：Load Sensing Swash Plate Control
Nominal Working Pressure：28 MPa (280 bar)
Rated Rotation Speed：2300 rpm
Max Allowable Rotation Speed：2600 rpm
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
Working Temperature Range：-20℃ ~ +110℃
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
Packaging：Independent anti-rust packaging + export wooden case
Storage Environment：Dry indoor storage, moisture-proof, impact-proof, anti-corrosive gas

advantage

- Load sensing optimized for alternating backhoe digging and front loading
The load sensing response is tuned for backhoe typical dual working mode. It quickly switches flow output between rear digging and front loading, reducing power loss during mode conversion.
- Compact body design fits narrow engine compartment of backhoe loader
Small footprint pump structure adapts to limited installation space of CAT416/428, easy disassembly and replacement without heavy modification of surrounding pipelines.
- Multi-circuit flow sharing for simultaneous front loader and rear backhoe operation
Precise flow distribution allows front bucket and rear digging arm to work together partially, improving work efficiency for small-site multi-task jobs.
- Wear-resistant friction pair for frequent start-stop and load switching
Upgraded internal friction pair handles repeated load alternation between digging and loading, resisting fatigue wear under frequent cyclic operation.
- Stable pressure holding for backhoe arm positioning and loader boom retention
Reliable pressure retention prevents arm drift during static positioning, helpful for trenching and material stacking work in municipal projects.
- Alternating digging & loading cycle bench test for compact job site
Each pump undergoes cyclic test simulating alternating digging and loading, verifying stable performance under frequent mode switching on small construction sites.

FAQ 

Q1: Which machine does 9T-6857(0R-4218)/4T-6895 plunger pump fit?
A1: This hydraulic plunger pump is designed for CAT416 and CAT428 backhoe loader, supplying hydraulic power for front loader and rear backhoe system. Confirm machine serial number before purchase.

Q2: What hydraulic functions does this pump support?
A2: It provides high-pressure hydraulic oil for front boom, front bucket, rear digging arm, rear bucket and vehicle steering, completing trenching, excavation and material loading tasks.

Q3: What are typical failure symptoms of worn pump?
A3: Typical symptoms: weak digging force on rear arm, slow front bucket movement, obvious arm drift when holding position, temperature rise during continuous alternating work, pump abnormal noise and shaft seal oil leakage.

Q4: What inspections should be done before installing new pump?
A4: Inspect front loader cylinders, backhoe arm cylinders, multi-way valve and filter elements. Fully flush hydraulic tank and pipelines to remove metal debris. Replace degraded hydraulic oil before assembly.

Q5: Why backhoe still lacks 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.

our warehouse

our warehouse

Pack and ship

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