250-8337 plunger pump For cat 140M motor grader

250-8337 plunger pump For cat 140M motor grader Featured Image
  • 250-8337 plunger pump For cat 140M motor grader

Short Description:

228-3636 variable axial plunger pump is aftermarket replacement for Caterpillar 834H wheel dozer, 836H landfill compactor and 988H wheel loader with C18 engine.

Product Detail

Product Tags

description

250-8337 axial variable piston pump acts as core hydraulic power source for CAT140M motor grader, driven by C7 engine. It converts mechanical power into adjustable high-pressure hydraulic energy to feed blade lifting, side shifting, steering and ripper hydraulic systems. Built-in pressure-flow compound control valve dynamically adjusts pump displacement. When heavy cutting or ripping, it delivers large flow and high pressure; during fine grading or travelling, it reduces displacement to save power and reduce heat generation. Core internal components including plungers, cylinder block, valve plate and slippers adopt high-strength alloy steel, processed by precision grinding and nitriding hardening. The friction pair maintains stable volumetric efficiency under frequent short-cycle switching typical for road grading. Compact cast iron housing eliminates casting residual stress via stress relief annealing, resisting frequent vibration and dust on road construction sites.

product parameters

Part No：250-8337
Product Type：Variable Displacement Axial Piston Pump
Applicable Equipment：CAT 140M Motor Grader, C7 Engine
Control Mode：Pressure-Flow Compound Control
Displacement：62 cc/rev
Nominal Working Pressure：27 MPa (270 bar)
Max Instantaneous Peak Pressure：32 MPa (320 bar)
Rated Rotation Speed：2200 rpm
Max Allowable Rotation Speed：2500 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

- Custom compound control logic optimized for grading cyclic operations
Specially tuned pressure-flow compound control responds rapidly to frequent blade lifting, tilting and ripper activation. It delivers instant pressure boost during cutting and automatically reduces flow during fine leveling, improving grading precision while cutting unnecessary power consumption.
- Compact integrated structure, easy maintenance for motor grader narrow installation space
Compact body design fits the limited mounting space of CAT140M grader. The integrated control valve assembly simplifies disassembly and inspection, reducing time spent on on-site component troubleshooting and maintenance.
- Precision matched flow response for multi-function simultaneous action
Well-balanced flow output supports simultaneous operation of blade side-shift and steering without obvious pressure drop. It ensures smooth and coordinated multi-action for fine road leveling and slope trimming.
- Low pulsation design, reduces hydraulic vibration and protects grader hydraulic piping
Optimized internal flow channel reduces pressure pulsation during frequent short-cycle operation. It lowers vibration transmitted to hydraulic pipelines, delaying pipe fatigue cracking and extending service life of the whole hydraulic circuit.
- Anti-contamination internal matching, adapts to dusty road construction environment
Tight clearance matching of friction pair improves resistance to minor particle contamination. It reduces the risk of early wear caused by impurity particles in hydraulic oil on construction sites.

FAQ 

Q1: What machine does 250-8337 plunger pump fit?
A1: This hydraulic plunger pump is designed for CAT140M motor grader with C7 engine, supplying hydraulic power for blade, ripper and steering system. It is not universal for other grader generations. Confirm machine serial number before purchase.

Q2: What are the main hydraulic functions supported by this pump?
A2: It provides pressurized oil for grader blade lifting, lowering, side shifting, steering and rear ripper operation. It handles rough cutting, fine grading and slope trimming for road construction projects.

Q3: What signs show the plunger pump is worn?
A3: Typical symptoms: slow blade movement during fine grading, insufficient cutting force on hard ground, shaking of blade during operation, abnormal pump noise, pressure fluctuation and shaft seal oil leakage.

Q4: What inspections are required before installing the new pump?
A4: Inspect blade cylinders, ripper cylinder, multi-way control valve and filter elements. Fully flush hydraulic tank and pipelines to remove metal debris. Replace contaminated hydraulic oil before assembly.

Q5: Why the grader blade still works sluggishly after pump replacement?
A5: The problem may not be from pump. Check relief valve calibration, stuck spool, clogged filter, cylinder seal failure or trapped air in hydraulic circuit. Be sure to bleed air 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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