Replacement SBS80 Pump Parts E312C Swashplate Saddle E315D Drive Shaft Cylinder Block Valve Plate for CAT 312C 312D 315D Excavator
Welcome to our heavy machinery hydraulic supply center. We specialize in providing high-precision SBS80 hydraulic pump replacement parts (including E312C swashplate saddle bearings, E315D left & right drive shafts, cylinder blocks, valve plates, piston shoes, and retainer plates), precision-manufactured as heavy-duty aftermarket components compatible with Cater.pillar CAT 312C, 312D, 315C, and 315D excavators. Engineered to exact OEM tolerances, these spare parts restore system pressure and operating efficiency under heavy digging loads.
Key Technical Specifications & Component List
- Hydraulic Pump Model: SBS80 Series Axial Piston Main Pump
- Applicable Machinery Models: Fit for Cater.pillar CAT 311C, 312C, 312C L, 312D, 314C, 315C, 315D L Excavators
- Available Component Parts: E312C Swashplate Saddle Bearing, E315D Left & Right Drive Shafts, Cylinder Blocks (R+L), Valve Plates (R+L), Piston Shoes, Ball Guides, Retainer Plates, and Pump Seal Kits
- Material & Metallurgy: High-frequency quenched alloy steel shafts, bronze-alloy plated valve plates, and heavy-duty ductile iron blocks
- Condition: 100% Brand New Aftermarket / Direct OEM Fit Interchangeable Parts
- Quality Testing & Warranty: 100% Hardness and Tolerance Tested, 6–12 months warranty included
CAT SBS80 Hydraulic Pump Common Faults & Overhaul Solutions
Worn internal pump parts degrade excavator cycle times and digging power. Overhauling your pump with our SBS80 replacement parts directly resolves these common hydraulic failures:
1. Low Hydraulic Pressure / Weak Digging Power (全车动作无力)
Cause: Deep scratches on the valve plate or cylinder block face leading to high internal oil bypass.
Fix: Installing our precision-lapped SBS80 cylinder blocks and valve plates restores full operating pressure.
2. Engine Bogging / Engine Stalling under Load (憋发动机)
Cause: Worn E312C swashplate saddle bearings preventing smooth pump displacement control.
Fix: Replacing worn saddle bearings and swashplate cradles ensures instant, smooth displacement response without lugging the engine.
3. Shaft Spline Wear & Drive Shaft Snapping (传动轴磨损断裂)
Cause: Torque fatigue or spline wear on drive shafts caused by high-pressure digging impacts.
Fix: Installing our high-tensile E315D left & right drive shafts restores rigid drive connection to the engine coupling.
4. Loud Pump Noise & Cavitation Chatter (液压泵噪音大/异响)
Cause: Loose piston shoe sockets or worn retainer ball guides causing unstable piston stroke.
Fix: New precision piston shoes and retainer guide ball sets eliminate chatter and smooth hydraulic flow.
5. High Hydraulic Oil Temperature & Leakage (高温/轴封漏油)
Cause: Internal fluid leakage generation and damaged drive shaft seals from high temperature.
Fix: Restoring micron-level internal tolerances reduces thermal oil recirculation and stops shaft oil leaks.
Worksite Applications & Rebuild Suitability
Ideal for equipment mechanics, hydraulic repair shops, and fleet maintenance, these SBS80 overhaul parts excel in:
- CAT 12-to-15 Ton Excavator Main Pump Overhaul: Direct replacement parts for SBS80 pumps on CAT 312C, 312D, and 315D.
- General Earthmoving & Pipeline Construction: Restores boom, stick, and bucket speed under heavy digging cycles.
- Cost-Effective Maintenance: Economical rebuild alternative compared to buying a complete new OEM pump assembly.
Frequently Asked Questions (FAQ)
Q: Where can I buy replacement parts for a CAT 312C SBS80 hydraulic pump?
A: You can purchase complete SBS80 hydraulic pump rebuild parts (swashplate saddle, drive shafts, cylinder block, valve plate) directly from us. We stock OEM-interchangeable components for Cater.pillar excavators.
Q: Are E312C and E315D SBS80 pump drive shafts interchangeable?
A: The SBS80 pump uses left and right drive shafts. While most SBS80 shafts fit both 312C and 315D models, spline teeth counts and lengths should be cross-checked with your old shaft before ordering.
Q: Are these SBS80 cylinder blocks and valve plates ready for immediate installation?
A: Yes, all valve plates and cylinder blocks are precision ground and lapped at the factory for immediate drop-in fitment without further machining.
