708-1S-00390 Fan Pump For Komatsu D375 bulldozer

708-1S-00390 Fan Pump For Komatsu D375 bulldozer Featured Image
  • 708-1S-00390 Fan Pump For Komatsu D375 bulldozer

Short Description:

708-1S-00270 is OEM-grade variable displacement piston hydraulic main pump for Komatsu PC27MR-3 mini excavator.

Product Detail

Product Tags

description

Developed exclusively for the high-heat and heavy-duty characteristics of D375 large bulldozers, this variable displacement piston fan pump features intelligent temperature linkage variable regulation. When the engine is under heavy load and the water temperature rises, the pump automatically increases displacement and flow to raise fan speed and enhance forced heat dissipation; under light-load and standby conditions, it reduces output flow to cut invalid power consumption and achieve energy-saving and fuel-efficient operation.
The pump body adopts integral thickened high-density cast iron for overall reinforcement, with ultra-high structural rigidity and pressure resistance, which can resist extreme mechanical vibration, impact load and long-term thermal expansion and contraction generated by super-large bulldozers during full-load operation. The internal precision piston and swash plate assembly are made of high-purity hardened alloy steel, processed by multi-channel precision grinding and surface carburizing hardening technology, with super wear resistance and anti-fatigue stability. Equipped with upgraded multi-stage combined FKM sealing system, it resists high temperature, high pressure and hydraulic oil corrosion, and completely solves common leakage failures of traditional fan pumps.

product parameters

Part No：708-1S-00390
Product Type：Temperature-Sensing Variable Piston Hydraulic Fan Pump
Applicable Equipment：Komatsu D375A-6, D375A-6R Super Large Bulldozer
Core Technology：Intelligent temperature linkage variable control, automatic flow matching
Theoretical Displacement：48 cc/rev (optimized for D375 full-load heat dissipation demand)
Rated Working Pressure：25 MPa (250 bar) (stable long-term working pressure)
Max Instantaneous Peak Pressure：29 MPa (290 bar) (instant impact pressure resistance)
Rated Working Speed：2050 rpm (economic and stable operating speed)
Max Allowable Speed：2550 rpm (limit no-load operating speed)
Rated Output Flow：122 L/min (standard heat dissipation flow)
Minimum Standby Flow：28 L/min (energy-saving standby flow)
Working Medium：ISO VG46 Anti-wear Hydraulic Oil (special construction machinery oil)
Working Temperature Range：-25℃ ~ +115℃ (adapt to extreme cold and high-temperature field environment)
Sealing Grade：Industrial high-pressure zero-leakage standard
Main Material：Reinforced thick cast iron housing, carburized hardened alloy movement pair, multi-stage FKM composite seal

advantage

• 48cc upgraded variable piston structure with intelligent temperature-sensing linkage control, accurately matching the ultra-high heat generation of D375 super-large bulldozer under full-load mining operation. It dynamically balances heat dissipation efficiency and power energy consumption, effectively solving long-term high-temperature problems and reducing overall fuel loss.
• Heavy-duty integrally reinforced cast iron pump body, with ultra-high structural rigidity and impact resistance. It stably resists extreme vibration and alternating load generated by heavy push-dozing and climbing construction, avoiding shell deformation, cracking and oil leakage failures.
• Carburized and hardened alloy motion pair greatly improves surface hardness and wear resistance. It adapts to harsh construction environments with dusty and slightly contaminated hydraulic oil, maintaining stable pressure and flow output without attenuation during long-term continuous operation.
• Upgraded multi-stage FKM composite sealing system, breaking the temperature resistance limit of ordinary seals. It operates stably in high-temperature accumulation working conditions all year round, effectively eliminating internal hydraulic leakage and shaft head oil seepage, and reducing daily maintenance costs.
• Precision temperature variable regulation achieves fast flow response, realizing real-time matching of fan speed and engine heat load. It avoids insufficient heat dissipation under heavy load and energy waste under light load, greatly improving equipment operation stability and economy.

FAQ 

Q1: Which equipment does 708-1S-00390 fan pump fit?
A1: This hydraulic fan pump is specially applicable to Komatsu D375A-6 and D375A-6R super-large bulldozers. It is recommended to confirm the equipment serial number before purchasing to ensure accurate matching.

Q2: What is the core function of this fan pump?
A2: It is the exclusive hydraulic power source of D375 bulldozer cooling system. It converts engine mechanical energy into hydraulic energy to provide stable pressure oil for the fan motor. Through temperature-sensing variable control, it dynamically adjusts flow and fan speed to precisely control engine coolant and hydraulic oil temperature, preventing overheating and power drop during long-term heavy-load operation.

Q3: What inspections need to be completed before installing a new fan pump?
A3: First, inspect and replace deteriorated, contaminated hydraulic oil and filter elements to ensure oil cleanliness. Second, check cooling system pipelines, relief valves and temperature control valves for blockage, damage or stuck spools. Thoroughly flush the hydraulic tank and pipelines to remove metal debris and impurities, and complete full air bleeding after installation to avoid air resistance.

Q4: Bulldozer still overheats after replacing fan pump, what are the possible reasons?
A4: Equipment overheating is not solely caused by fan pump failure. It is necessary to check whether the radiator core is blocked by sediment and dust, whether the hydraulic system pressure is insufficient, whether the filter is clogged, whether the hydraulic circuit is trapped with air, and whether the fan motor and impeller are worn or damaged. Eliminate auxiliary system faults to solve the overheating problem.

warehouse

We have built four spare parts warehouses in Xuzhou, Jining, Kunshan and Changsha to provide customers from all over the world with a variety of high-quality spare parts. We can basically ship self-provided spare parts within three days after confirming the order. If the spare parts need to be adjusted or processed, they will be shipped within 7-30 days.

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