6E-1279 6E1279 axial piston pump for Caterpillar 12G 130G 140G 160G grader
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Component: Main Hydraulic Variable Displacement Axial Piston Pump Assembly
Caterpillar OEM Part Numbers: 6E-1279, 6E1279 (Cross-references / Supersedes: 9T-1417, 9T1417)
Machine Compatibility:
Caterpillar (CAT) 12G Motor Grader
Caterpillar (CAT) 130G Motor Grader
Caterpillar (CAT) 140G Motor Grader
Caterpillar (CAT) 160G Motor Grader
Condition: Brand New Original / Premium OEM Specification Equivalent (Complete Drop-In Unit)
System Function: Main implement and steering hydraulic pump providing primary hydraulic flow for blade control, articulation, wheel lean, and steering functions on G-Series motor graders.
2. Technical Specifications
Pump Type: Variable Displacement Axial Piston Pump
Flow & Pressure Performance: High-pressure output capability engineered to maintain precise blade positioning and multi-function responsiveness under heavy scraping and grading loads.
Control Network: Equipped with load-sensing flow and pressure compensators (regulators) to match hydraulic output directly with operator blade joystick inputs, reducing engine load during standby.
Drive Interface: Heavy-duty input drive shaft designed for direct inline coupling to the engine power take-off (PTO) drive housing.
3. Critical Installation Requirements
Pump Casing Priming (Mandatory)
Before starting the engine, manually fill the main pump casing with clean, fresh hydraulic fluid through the highest case drain port. Operating an axial piston pump dry—even for a few seconds—will score the valve plate and piston slippers, causing immediate total pressure loss and internal destruction.
Air Bleeding & Initial Startup Procedure
After installation and casing pre-fill, loosen the air bleed plug on top of the pump housing. Crank the engine with fuel delivery disabled until clear, bubble-free hydraulic oil flows out, then tighten the plug. Allow the engine to idle under no load for 10 to 15 minutes to purge any trapped air from the implement circuit loops.
Hydraulic System Flushing & Decontamination
If replacing a pump that suffered catastrophic mechanical breakdown, you must thoroughly drain and flush the main hydraulic reservoir, clean oil cooler lines, and flush the implement control valve spools. Always replace return, suction, and pilot filter elements prior to startup.
Pressure Regulator Calibration
Verify system relief pressure and load-sensing margin settings upon startup. Incorrect pressure differential settings can lead to sluggish moldboard blade movement or engine stalling under heavy grading force.
4. Frequently Asked Questions (FAQ)
Q: Are part numbers 6E-1279 and 9T-1417 interchangeable?
A: Yes. Part number 6E-1279 is the standard factory update and supersession for the older 9T-1417 hydraulic pump assembly used on Caterpillar G-series motor graders. They share identical physical frame mounting dimensions, input shaft configurations, and port connections.
Q: My CAT 140G motor grader responds slowly to blade lift or steering inputs when multiple levers are pulled. Is the main pump failing?
A: Sluggish multi-function operation or delayed blade response usually indicates internal wear on the pump's cylinder barrel wear plate or a sticking load-sensing pressure compensator valve. Replacing the pump restores full hydraulic flow and precise implement control.
Q: Does the unit arrive complete with the control regulators pre-installed?
A: Yes. The 6E-1279 pump assembly is supplied fully assembled with pre-set load-sensing and pressure-limiting control valves attached and bench-tested.
5. Shipping & Logistics
Packaging: Treated with rust-inhibiting anti-corrosion storage oil, fitted with plastic port plugs, and secured inside an export-safe protective crate or box.
Transit Time: Global express air freight via DHL/FedEx/UPS typically delivers within 3 to 7 business days directly to your workshop or job site.