112-6564/161-6634 Plunger Pump For Caterpillar 416,426,428,436,438C backhoe loaders

112-6564/161-6634 Plunger Pump For Caterpillar 416,426,428,436,438C backhoe loaders Featured Image
  • 112-6564/161-6634 Plunger Pump For Caterpillar 416,426,428,436,438C backhoe loaders

Short Description:

100-3259 variable axial plunger pump is aftermarket replacement for Caterpillar 416,426,428,436B backhoe loaders. It delivers high-pressure hydraulic oil for backhoe digging arm, front loader bucket and steering circuit.

Product Detail

Product Tags

description

112-6564 axial variable piston pump acts as the core hydraulic power source of CAT C-series backhoe loaders. Driven by the machine diesel engine, it converts mechanical power into adjustable high-pressure hydraulic energy to feed backhoe digging circuit, front loader circuit and steering system. The built-in compound control valve modifies pump displacement dynamically based on real-time working load. During heavy digging or bucket loading, it outputs large flow and high pressure; while travelling or light-duty operation, it reduces displacement to save engine power and lower hydraulic heat accumulation. 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：112-6564 /161-6634 (0R-7793)
Product Type：Variable Displacement Axial Piston Pump
Applicable Equipment：CAT 416, CAT426, CAT428, CAT436, CAT438C Backhoe Loader
Control Mode：Pressure-Flow Compound Control
Rated Rotation Speed：2200 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

advantage

- Nitrided alloy steel friction pair, stable performance under frequent load switching
Plunger, cylinder block and valve plate adopt deep nitrided alloy steel. It retains 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 operation
High-precision compound control automatically adjusts displacement for mixed working modes. It delivers sufficient power for digging and reduces power loss during travel, lowering fuel consumption and hydraulic heat accumulation.
- Compact reinforced cast iron housing, strong vibration resistance for construction sites
Compact thick cast iron housing with stress relief treatment. It withstands frequent impact and dusty environment on municipal construction sites, preventing pump housing deformation and cracking.
- Premium FKM sealing assembly, reliable sealing under variable temperature
High-quality FKM seals resist high temperature and hydraulic oil aging. It reduces external oil seepage and internal leakage, maintaining stable pressure for multi-functional hydraulic circuits.
- Complete bench inspection before delivery, consistent performance and low failure rate
Each pump undergoes pressure retention, flow curve and variable response testing. Strict QC meets OEM hydraulic system requirements for C-series backhoe loaders.

FAQ 

Q1: Which machine models does 112-6564 /161-6634(0R-7793) plunger pump fit?
A1: This main hydraulic pump fits CAT416,426,428,436,438C C-series backhoe loaders. It is not compatible with B/D/E/F generation machines. Confirm machine serial number before purchase.

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

Q3: What signs show the main pump is worn out?
A3: Typical symptoms: digging capacity drops sharply under heavy load, front bucket moves sluggishly, steering response becomes delayed, pump generates abnormal noise during operation, hydraulic oil temperature rises rapidly 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 contaminated oil before assembly.

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