AT332426 plunger pump For John Deere 844K wheel loader

AT332426 plunger pump For John Deere 844K wheel loader Featured Image
  • AT332426 plunger pump For John Deere 844K wheel loader

Short Description:

9T-6857(0R-4218) /4T-6895 variable axial plunger pump is aftermarket replacement part for CAT416 and CAT428 backhoe loader. It delivers high-pressure hydraulic oil for front loader boom, bucket, rear excavator arm, bucket and steering circuits.

Product Detail

Product Tags

description

AT332426 axial variable piston pump serves as main hydraulic power unit for John Deere 844K wheel loader, driven by engine. It converts mechanical power into adjustable high-pressure hydraulic energy for boom, bucket and steering hydraulic systems. Built-in load sensing control valve dynamically changes pump displacement. During heavy bucket digging and loading, pump increases flow to maintain boom speed; under light load or idle travel, it reduces displacement to save fuel and reduce 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 housing adopts stress relief annealing to eliminate casting residual stress, resisting strong vibration and particle contamination in quarry and bulk material 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：AT332426
Product Type：Variable Displacement Axial Piston Pump
Applicable Equipment：John Deere 844K Wheel Loader
Control Mode：Load Sensing Swash Plate Control
Nominal Working Pressure：30 MPa (300 bar)
Rated Rotation Speed：2100 rpm
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
Working Temperature Range：-20℃ ~ +115℃
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
Product Condition：Brand new aftermarket part, 100% hydraulic bench tested
Packaging：Independent anti-rust packaging + export wooden case
Storage Environment：Dry indoor storage, moisture-proof, impact-proof, anti-corrosive gas

advantage

- High flow compound action capability for simultaneous boom lift and bucket curl
Precise flow sharing enables boom lifting and bucket curling to operate at the same time without power shortage, greatly shortening loading cycle time in large quarry sites.
- Reinforced valve plate and friction pair for heavy rock shovel impact
Upgraded friction pair structure improves wear resistance, coping with repeated impact loads when bucket penetrates hard rock piles during continuous high tonnage loading.
- Stable pressure retention for heavy material holding on ramp operation
Excellent pressure holding performance prevents boom sinking during static load retention on sloped stockpiles, maintaining stable posture during high tonnage stacking work.
- Optimized flow pulsation control to reduce system heat buildup
Refined internal flow channel design lowers pressure fluctuation during variable displacement adjustment, reducing system heat generation and extending service life of hydraulic seals and cylinders.
- Full quarry loading cycle bench test simulating high tonnage material handling
Each pump undergoes cyclic test simulating repeated rock digging, lifting and dumping, verifying reliable performance under long-duration heavy-load quarry loading.

FAQ 

Q1: Which machine does AT332426 plunger pump fit?
A1: This hydraulic plunger pump is designed for John Deere 844K large wheel loader, serving as main hydraulic pump for boom and bucket operation. Confirm machine serial number before purchase.

Q2: What hydraulic functions does this pump support?
A2: It provides high-pressure hydraulic oil for boom lifting/lowering, bucket tilt, bucket curl and vehicle steering, completing rock digging, bulk material loading and stockpiling work.

Q3: What are typical failure symptoms of worn pump?
A3: Typical symptoms: insufficient breakout force for rock digging, slow boom lifting under heavy load, boom sinks during holding, excessive temperature rise during continuous high-tonnage loading, pump abnormal noise and shaft seal oil leakage.

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

Q5: Why loader still lacks digging force 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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