345C 345CL 259-0817 295-9759 K5V200DTH Hydraulic Main Pump Assembly Compatible with CAT

1. Product Overview & Wholesale Price Advantage

The CAT 345C / 345CL K5V200DTH Hydraulic Main Pump Assembly (OEM Part # 259-0817 / 295-9759 / K5V200DTH / K5V200DT) is an ultra-high pressure dual axial piston variable displacement pump engineered for 45-ton heavy mining excavators operating under extreme rock ripping, open-pit ore digging, and quarry loading operations.

• Direct Factory Wholesale Price: $4,200 – $7,800 USD (Direct Source Supply — Save 50%–65% vs Regional OEM Dealer Markups)
• Zero Middleman Markup: Shipped straight from our manufacturing floor with zero distributor extra fees
• MOQ & Bulk Tier Discount: 1 Unit (Tiered volume wholesale discounts available for international equipment fleets & repair dealers)
• Lead Time: 1–3 business days (Large factory stock ready for immediate air/sea shipping)
• Quality Guarantee: 12 Months full replacement factory warranty with 100% dynamic 380 Bar bench test video proof

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

Precision-matched flow control designed to deliver smooth hydraulic power under continuous field operations:

• Extreme Open-Pit Rock Mining: Massive continuous oil displacement for rapid loading of heavy haul trucks with CAT 345C excavators.
• Hard Rock Ripping & Quarrying: High sustained hydraulic pressure for uninterrupted boom penetration in granite and iron ore mining pits with CAT 345CL machines.
• Massive Earthmoving: Electronically-controlled dual negative flow control for fuel-efficient long-hour continuous digging cycles.
• Demolition & Heavy Breaker Operations: Heavy cast iron pump housing built to absorb continuous high hydraulic pressure shockwaves from heavy breaker attachments.

3. Hydraulic Main Pump Troubleshooting & Diagnostic Guide (液压泵常见故障排查)

If your CAT 345C mining excavator is exhibiting hydraulic system power loss, consult the diagnostic guide below:

• Fault 1: Cold Machine Operates Normally, But Machine Slows Down & Drops Pressure After 1 Hour (冷车正常,热车掉压发慢)
  Root Cause: Thermal expansion wear gap between the piston shoes, cylinder block, and valve plate inside the K5V200DTH rotary group.
  Solution: Replace with a complete drop-in CAT 345C main pump assembly (OEM 259-0817) or overhaul internal rotary group kit.
• Fault 2: Engine Stalls or Overloads When Actuating Heavy Mining Boom/Arm (憋车/发动机过载熄火)
  Root Cause: K5V200DTH pump electronic regulator power-control spool jammed or hydraulic pilot regulator valve miscalibrated.
  Solution: Recalibrate pump regulator pilot pressure or replace the complete regulator assembly to restore engine power matching.
• Fault 3: Hydraulic Oil Leakage From Main Drive Shaft Seal Area (主驱动轴封高压串油漏油)
  Root Cause: Clogged casing drain line causing excessive internal housing backpressure, blowing out front drive shaft seal.
  Solution: Flush housing drain lines, replace front drive shaft seal, and check gear pilot pump relief pressure.
• Fault 4: Abnormal Cavitation Noise or Severe Vibration From Main Pump (泵体异响抖动/气蚀)
  Root Cause: Air suction at inlet pipe, contaminated hydraulic tank filter, or worn drive shaft roller bearings.
  Solution: Replace suction line seals, flush hydraulic fluid tank, and replace drive shaft roller bearings.
• Fault 5: Black Metallic Filings Found Inside Hydraulic Tank Filter (油箱内有黑粉或金属屑)
  Root Cause: Severe friction galling on swashplate shoe bronze layer or cylinder block face failure.
  Solution: Flush entire hydraulic piping system, clean main control valve, and install a new CAT 345C main pump assembly.

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 K5V200DTH main pump fits my CAT 345C or 345CL excavator?
A: Check your original pump nameplate for OEM part numbers 259-0817, 295-9759, or K5V200DTH stamp. You can also send us your machine serial number for instant fitment verification.

Q2: My CAT 345C mining excavator stalls the engine when digging hard rock. Will replacing the pump solve it?
A: Yes, engine stalling under mining load is usually caused by a faulty pump regulator valve failing to de-stroke properly. Installing our new K5V200DTH main pump restores full hydraulic speed and power matching.

Q3: Is this CAT 345C hydraulic main pump bench tested before shipment?
A: Yes, every single pump undergoes a 5-step factory bench pressure test up to 380 Bar and volumetric efficiency check above 95%. A live test video is provided before shipping.