K3V112DT-9C12 Hydraulic Pump Assembly Excavator Main Piston Pump Construction Machinery Parts K3V112DT-9C12 R220LC-7 R210LC-7 R215-7C R225LC-7 31N6-10050
Price:
Negotiable
MOQ:
1 Pc
Delivery Time:
7-15days
Product Description
K3V112DT-9C12 Hydraulic Pump Assembly Excavator Main Piston Pump Construction Machinery Parts K3V112DT-9C12
Function
Hydraulic main pump is the core power unit of excavator hydraulics. Driven by engine, it converts mechanical energy to high-pressure hydraulic energy and supplies pressurized fluid to hydraulic motors for all working motions.
Type
Axial variable piston pumps are standard for construction excavators. Medium and large excavators adopt integrated dual main pumps plus rear pilot gear pump.
Dual independent high-pressure oil circuits serve main control valve for composite actions, working pressure: 28~35MPa.
Tail pilot pump works at 3~4MPa (low flow), providing control oil for levers and valve spools.
Dual independent high-pressure oil circuits serve main control valve for composite actions, working pressure: 28~35MPa.
Tail pilot pump works at 3~4MPa (low flow), providing control oil for levers and valve spools.
Internal Parts
Piston assemblies rotate with main shaft to suck and pressurize oil. Swash plate angle adjusts piston stroke and pump displacement.
External servo regulator controls swash plate via hydraulic feedback. Larger angle = higher flow & speed; smaller angle = lower fuel consumption.
Valve plate separates low-pressure inlet and high-pressure outlet for oil distribution.
External servo regulator controls swash plate via hydraulic feedback. Larger angle = higher flow & speed; smaller angle = lower fuel consumption.
Valve plate separates low-pressure inlet and high-pressure outlet for oil distribution.
Three Control Modes
- Constant power control: Reduce displacement under heavy load to protect engine.
- LS load sensing: On-demand flow, low displacement at idle for fuel saving.
- HP pressure limit: Cut displacement at peak pressure to protect hydraulic components.
Common Failures
Internal leakage (worn pistons/valve plate/blocked regulator): Slow operation, low power.
Regulator stuck at max displacement: Engine overload, black smoke, stall.
Excessive leakage: Hydraulic oil overheating. Air intake/damaged parts: Abnormal noise.
Regulator stuck at max displacement: Engine overload, black smoke, stall.
Excessive leakage: Hydraulic oil overheating. Air intake/damaged parts: Abnormal noise.
Maintenance
Replace hydraulic oil and filters regularly. Ensure suction pipe tightness. Keep oil level within standard range.
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Machinery Test Report
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Provided |
Warranty
|
3 Months |
|
Video outgoing-inspection
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Provided | Brand Name |
OEM
|
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Place of Origin
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China | Product Name |
Hydraulic Pump
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Model
|
K3V112DT-9C12 | MOQ |
1 Piece
|
| Quality |
High-Quality
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Delivery time
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7-15 Days
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Standard or Nonstandard
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Standard
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Application
|
Excavator Machinery
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Size
|
Standard Size
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Color | Red |
Company Profile
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Company
Lanzhou Fudong Guangqi Trading Co., Ltd
Location
No. 7 West South Binhe Road, Xigu District, Lanzhou City, Gansu Province, China
Contact Person
Liang