CAT 312C 315D 204-2757 259-0814 SBS80 Hydraulic Pump Parts Swash Plate Shaft Compatible with Cat-erpillar

1. Product Overview & Wholesale Price Range

The Cat-erpillar SBS80 Hydraulic Main Pump Parts Kit with Swash Plate Assembly & Drive Shaft (OEM Part # 204-2757 / 259-0814 / 173-0708 / SBS80) includes the complete internal rotary group overhaul set: forged drive shaft, cradle swash plate assembly, cylinder block, piston shoes with bronze slippers, distributor valve plate (RH/LH), retainer plate, and ball guide designed for 12-to-15-ton excavators undergoing hydraulic pump overhauls.

• Factory Wholesale Price: $280 – $680 USD (Direct manufacturer pricing — Save up to 50% vs regional dealer markups)
• Included Core Spare Parts: Swash Plate Assembly (1pc) + Forged Drive Shaft (1pc) + Cylinder Block (1pc) + Piston Shoes (9pcs) + Valve Plate (1pc) + Retainer Plate (1pc)
• MOQ & Bulk Discount: 1 Set (Tiered wholesale discounts available for hydraulic repair shop batch orders)
• Lead Time: 1–3 business days (Large factory stock ready for immediate worldwide dispatch)
• Warranty: 12 Months full replacement warranty with high-lead bimetallic bronze durability guarantee

2. Application Worksite Checklist (施工场景清单)

Engineered to restore original torque transmission and hydraulic working pressure across demanding 12-15 ton excavator jobsites:

• Urban Utility Trenching & Cable Laying: Micro-lapped swash plate cradle faces ensure pinpoint angle control for smooth boom and arm excavation.
• Highway Infrastructure & Earthmoving: High-frequency induction hardened drive shafts withstand continuous 300 Bar working torque without spline wear.
• Agricultural Drainage & Land Clearing: High thermal resistance bimetallic valve plates prevent internal power loss during continuous long-hour operation.
• Demolition & Small Breaker Operations: Case-hardened alloy steel pistons absorb continuous high hydraulic pressure shockwaves from hammer attachments.

3. Hydraulic Pump Parts Troubleshooting & Diagnostic Guide (斜盘/轴/泵配件常见故障排查)

If your CAT 312C / 315D excavator main pump is exhibiting driving or pressure loss symptoms, consult the diagnostic guide below:

• Fault 1: Swash Plate Cradle Wear & Hydraulic Angling Sticking (斜盘弧面磨损/变量卡顿)
  Root Cause: Friction galling or pitting on the swash plate cradle surface preventing smooth pump stroke displacement adjustment.
  Solution: Replace with our precision-ground alloy steel SBS80 swash plate assembly (OEM 204-2757).
• Fault 2: Drive Shaft Spline Wear, Stripping or Torque Transmission Slippage (传动轴花键磨损/打滑断裂)
  Root Cause: Extreme torsional fatigue, engine flywheel misalignment, or lack of spline lubrication over long continuous mining operations.
  Solution: Replace with our induction-hardened forged alloy drive shaft and complete SBS80 rotor assembly (OEM 259-0814).
• Fault 3: Thermal Pressure Loss & Machine Slowdown After 1 Hour (热车掉压发慢/内泄)
  Root Cause: Wear gap between the cylinder block face and valve plate surface causing internal high-pressure thermal oil bypass.
  Solution: Replace the worn rotary group with our precision lapped SBS80 cylinder block and valve plate kit.
• Fault 4: Black Copper Filings Found in Hydraulic Tank Oil Filter (油箱内有黑粉铜屑)
  Root Cause: Friction galling and thermal melting of the bronze layer on the piston slippers.
  Solution: Flush the entire hydraulic oil system, clean main control valve, and rebuild pump with a new SBS80 parts kit.

4. Hot Machinery Replacement Parts Recommendation (5大品类热门推荐表)

Explore our factory-direct replacement hydraulic components compatible with major global excavator brands:

5. Frequently Asked Questions & Technical Support (QA 问答专区)

Q1: How do I verify if this SBS80 swash plate assembly & drive shaft fit my CAT 312C or 315D excavator main pump?
A: Check your original pump nameplate for OEM part numbers 204-2757, 259-0814, or SBS80 stamp. You can also count the spline teeth on your old drive shaft and send us photos for instant fitment verification.

Q2: What is the material hardness and forging spec of the SBS80 drive shaft in this kit?
A: Our SBS80 drive shafts are forged from 40CrMo alloy steel with high-frequency induction hardened splines (HRC 58-62) to resist extreme torsional torque and prevent spline stripping.

Q3: Is this SBS80 parts kit a complete overhaul solution for main pump rebuilds?
A: Yes, it includes all major internal wear components (forged drive shaft, swash plate assembly, cylinder block, 9 pistons, valve plate, retainer plate, and ball guide) required for a complete pump rebuild.