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319-0677 | CAT C7 / C9 HEUI High-Pressure Pump — Small Flange, 36-Tooth Aluminum Drive, No Transfer Pump
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319-0677 | CAT C7 / C9 HEUI High-Pressure Pump — Small Flange, 36-Tooth Aluminum Drive, No Transfer Pump

319-0677 | CAT C7 / C9 HEUI High-Pressure Pump — Small Flange, 36-Tooth Aluminum Drive, No Transfer Pump

1. Product:319-0677
2. Compatible Equipment: Diesel Fuel Injection Systems
3. Manufacturer: Aftermarket OEM Replacement
4. Condition: Brand New, Fully Tested
5. Origin: ABOSEDE Diesel
6. Shipping period: 3-5 business days
7. Payment terms: T/T, Western Union, PayPal

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Product Introduction

In the heavy equipment sector, a diesel engine that won't start at a job site does not simply represent a mechanical inconvenience - it translates directly into hourly loss of machine productivity, operator stand-down, and potential contract penalties. When a CAT C7 diesel fails to build injection actuation pressure, the entire combustion sequence is blocked before a single drop of diesel reaches the combustion chamber. Part number 319-0677 is the unit injector hydraulic pump engineered specifically for C7 applications carrying the KAL, SAP, and WAX engine serial number prefixes, along with C9 platforms on the D-Series excavator range. Identifying the correct variant from the outset avoids the most common and expensive sourcing error in the HEUI service market: installing a visually similar pump with an incompatible gear and flange profile.

 

▌ Fleet Coverage: The Breadth of 319-0677 Across Caterpillar Platforms

 

Few HEUI actuation pump variants carry the application breadth of the 319-0677. Its compatibility profile spans multiple machine categories simultaneously, making it a high-velocity stock item for aftermarket distributors:

Excavators (D-Series): 324D / 324D FM / 324D L / 324D LN / 325D / 325D FM / 325D L / 325D MH / 326D L / 328D LCR / 329D / 329D L / 329D LN / 330D / 330D FM / 330D L / 330D LN / 330D MH / 336D / 336D L / 336D LN / 340D L / M325D MH

Wheel Loaders: 950H / 962H

Asphalt Pavers: AP-1055D / BG-2455D / BG-260D

Forestry & Specialty: Forwarder 584 / Wheel Feller Buncher 573 / Integrated Toolcarrier IT62H

Industrial & Petroleum C7 Engines (stationary and mobile power applications)

This cross-category reach is not coincidental - it reflects the deliberate standardisation of the C7 diesel powertrain across Caterpillar's D-Series product generation, enabling a single hydraulic actuation architecture to serve construction, paving, forestry, and material-handling applications under one part number.

 

▌ Pressure Architecture: Variable Displacement Under ECM Command

 

The 319-0677 operates as a demand-responsive hydraulic system rather than a fixed-output device. At engine start, the pump defaults to maximum displacement - its internal actuator spring positions the piston assembly for peak oil delivery, ensuring rapid actuation pressure build-up before the ECM commands the first injection event. As the engine stabilises and actuation pressure reaches the ECM's target value, the Injection Actuation Pressure Control Valve (IAPCV) modulates current to reduce pump displacement, preventing over-pressurisation of the high-pressure oil rail.

The operating pressure band spans 870 psi (6 MPa) at low idle to 4,061 psi (28 MPa) under peak load demand. This dynamic range is what enables the C7 diesel to achieve precise injection timing and quantity control under the ACERT combustion management strategy - cleaner diesel combustion, lower NOx output, and improved thermal efficiency relative to earlier mechanically governed systems. The 319-0677 is not a passive fluid mover; it is an active participant in the electronic engine management loop.

 

▌ Why "No Transfer Pump" Is a Configuration Specification, Not a Missing Component

 

A recurring point of confusion among procurement teams encountering the 319-0677 for the first time is the phrase "no transfer pump." This is not an indication of an incomplete or stripped-down part - it defines the pump's structural configuration. On CAT C7 and C9 diesel engines, the diesel transfer (lift) pump may be mounted separately on the rear of the actuation pump housing or may be located remotely in the diesel supply circuit depending on the machine model and build date.

The 319-0677 is the actuation pump body only - its function is exclusively to pressurise engine lubrication oil for HEUI injector actuation. It draws from the engine lubrication circuit, not the diesel supply circuit. Technicians ordering this part must independently verify that the existing diesel transfer pump is serviceable and correctly installed. Ordering a variant with an integrated transfer pump for an application that carries a standalone transfer pump arrangement will result in a plumbing conflict and potential oil circuit contamination between the lubrication and diesel systems.

 

❓ Frequently Asked Questions (FAQ)

 

Q1: How do I verify that the 319-0677 is correct for my specific C7 machine, not just the engine model?

Check the engine serial number prefix stamped on the engine block - the 319-0677 is validated for C7 engines carrying KAL, SAP, and WAX prefixes. For C9-powered D-Series excavators (324D through 340D), the 319-0677 also applies. If your C7 carries a different serial prefix, the correct actuation pump variant may differ. Never select solely by engine model designation; always cross-reference the serial prefix against the CAT parts catalogue or a verified fitment database.

Q2: My 330D excavator currently has a 319-0675 installed. Can I fit the 319-0677 instead?

These two part numbers carry different flange profiles and are not cross-compatible despite both being 36-tooth small-flange actuation pumps. The 319-0675 is validated for C-9/3126E (earlier C9 application), while the 319-0677 is calibrated for C7 and D-Series C9 engines. Flange bolt pattern and sealing surface geometry differ between them. Fitting the wrong variant will result in an oil leak at the mounting face and incorrect gear mesh depth.

Q3: Does the absence of an integrated transfer pump mean the diesel supply circuit is affected?

No. The 319-0677 operates entirely within the engine lubrication oil circuit - it pressurises engine oil, not diesel. The diesel supply to the HEUI injectors is handled by a separate diesel transfer pump in the fuel system. The "no transfer pump" designation means only that the diesel lift pump is not part of this assembly. Confirm the diesel transfer pump condition separately when servicing the actuation system.

Q4: What oil specification is required for the C7's HEUI actuation circuit that the 319-0677 pressurises?

The C7 HEUI system requires engine oil meeting CAT's ECF-3 specification, typically SAE 15W-40 in standard operating temperatures. Using an incorrect viscosity or a non-compliant oil formulation will directly affect the pump's ability to build and sustain actuation pressure - low-viscosity oils reduce pressure retention at the piston bores, while high-viscosity oils increase parasitic load on the gear train. Oil quality is as critical as pump condition for sustained HEUI system performance.

Q5: The 319-0677 and 10R-8899 appear on different invoices at different prices. Are they genuinely the same component?

Yes - 10R-8899 is the Caterpillar remanufactured programme part number for the same assembly that is sold as new under 319-0677. The 10R prefix denotes a CAT factory remanufactured unit requiring core return; the 319 prefix denotes a new unit. The cross-reference list for this assembly is extensive: 254-4357, 304-0678, 20R-3426, and 189-5184 all refer to the same physical actuation pump assembly across different procurement channels and model year listings.

 

Basic Information about the Company

 

202510091606539026

 

 

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