100-3259 Plunger Pump For Caterpillar 416,426,428,436B backhoe loaders

100-3259 Plunger Pump For Caterpillar 416,426,428,436B backhoe loaders Featured Image
  • 100-3259 Plunger Pump For Caterpillar 416,426,428,436B backhoe loaders

Short Description:

152-7767 variable axial piston pump is aftermarket replacement for Caterpillar 834G wheel dozer with C18 engine. It provides high-pressure hydraulic oil for blade lift, tilt and steering hydraulic circuits.

Product Detail

Product Tags

description

100-3259 axial variable piston pump serves as the core hydraulic power source of CAT B-series backhoe loaders. Driven by the machine diesel engine, it converts mechanical power into adjustable high-pressure hydraulic energy to feed rear backhoe working circuit, front loader circuit and steering system. The built-in compound control valve dynamically changes pump displacement according to real-time working load. During heavy digging or bucket loading, it outputs large flow and pressure; while travelling or light-duty operation, it reduces displacement to save engine power and cut heat accumulation of hydraulic system. Core internal components including plungers, cylinder block, valve plate and slippers are forged from high-strength alloy steel, processed with precision grinding and nitriding hardening treatment. The friction pair maintains stable volumetric efficiency under repeated cyclic load switching, which is typical for backhoe loader multi-task operation. The cast iron pump housing undergoes stress relief annealing to eliminate casting residual stress, resisting impact and continuous vibration in dusty construction sites.

product parameters

Part No：100-3259
Product Type：Variable Displacement Axial Piston Pump
Applicable Equipment：CAT 416, CAT426, CAT428, CAT436B Backhoe Loader
Control Mode：Pressure-Flow Compound Control
Rated Rotation Speed：2200 rpm
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

- Nitrided alloy steel friction pair, stable performance under frequent load changes
Plunger, cylinder block and valve plate adopt deep nitrided alloy steel. It keeps reliable volumetric efficiency under cyclic digging and loading operations, reduces internal leakage and extends service life.
- Pressure-flow compound control design, adaptive for multi-task backhoe work
High-precision compound control adjusts displacement automatically for mixed working modes. It delivers sufficient power for digging and cuts power loss during travel, lowering fuel consumption and hydraulic heat buildup.
- Compact reinforced cast iron housing, good anti-vibration performance on construction sites
Compact thick cast iron housing with stress relief treatment. It handles frequent impact and dusty environment on municipal and road job sites, preventing pump housing deformation and cracking.
- Premium FKM sealing assembly, stable sealing under variable temperature
High-quality FKM seals resist high temperature and hydraulic oil aging. It reduces external oil seepage and internal leakage, maintaining steady pressure for multi-functional hydraulic circuits.
- Complete bench inspection before delivery, stable performance and low failure rate
Each pump undergoes pressure retention, flow curve and variable response testing. Strict QC meets OEM hydraulic requirements for backhoe loader combined working system.

FAQ 

Q1: Which machines does 100-3259 plunger pump fit?
A1: This main hydraulic pump fits CAT416,426,428,436B backhoe loaders. It cannot be used for later D/E/F generations or other wheel loader models. Confirm machine serial number before purchase.

Q2: Can this pump drive both backhoe arm and front loader bucket simultaneously?
A2: Yes. It is the main hydraulic power source, supplying pressure oil for rear digging arm, front loader bucket and steering circuit at the same time.

Q3: What symptoms will appear when the main pump is worn out?
A3: Typical signs: digging power drops sharply under load, front bucket moves sluggishly, steering response becomes slow, pump produces abnormal noise during operation, hydraulic oil temperature rises fast during continuous combined work.

Q4: What inspection work should be done before installing the new pump?
A4: Inspect main relief valve, hydraulic cylinders and filter assemblies. Flush hydraulic tank and pipelines thoroughly to remove metal debris. Check hydraulic oil contamination and replace oil before assembly.

Q5: Why the backhoe still lacks power after pump replacement?
A5: The fault may not come from pump itself. Check main relief valve pressure setting, stuck control spool, clogged filter or trapped air in hydraulic circuit. Air bleeding is required 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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