708-1T-00420/708-1T-00421 Hydraulic Fan Pump For Komatsu D275A bulldozer

708-1T-00420/708-1T-00421 Hydraulic Fan Pump For Komatsu D275A bulldozer Featured Image
  • 708-1T-00420/708-1T-00421 Hydraulic Fan Pump For Komatsu D275A bulldozer

Short Description:

708-1L-00740 is OEM variable displacement piston main hydraulic pump designed for Komatsu D65EX-16, D65PX-16, D65EX-18 bulldozer.

Product Detail

Product Tags

description

This axial piston fan pump is customized for heavy mining cooling demand of D275A large bulldozer. It features independent temperature sensing regulator, separated from working hydraulic main pump system. When machine operates under heavy rock-cutting load and temperature rises, the pump increases displacement to raise fan speed and boost heat dissipation. Under idle or low-load travelling condition, it reduces output flow to cut parasitic power loss, saving fuel consumption. The pump housing adopts reinforced alloy cast iron, with outstanding thermal stability and anti-vibration performance, resisting continuous mechanical shock and thermal cycle deformation in mining sites. Internal piston and swash plate assembly adopt precision carburizing quenching process, low friction and stable volumetric efficiency under fluctuating pressure. The sealing assembly uses high-temperature resistant FKM multi-stage stack seal, coping with continuous heat accumulation inside pump cavity.

product parameters

Part No：708-1T-00420 / 708-1T-00421 (interchangeable pair)
Product Type：Thermal Sensing Axial Piston Fan Pump
Applicable Equipment：Komatsu D275A-5, D275A-5D Heavy Bulldozer
Core Technology：Independent temperature sensing variable regulation, separate cooling hydraulic circuit
Theoretical Displacement：38 cc/rev (calibrated for D275A mining heat dissipation)
Rated Working Pressure：22 MPa (220 bar) (continuous working pressure for fan circuit)
Max Instantaneous Peak Pressure：26 MPa (260 bar) (short time impact pressure resistance)
Rated Working Speed：2000 rpm (engine drive rated speed)
Max Allowable Speed：2450 rpm (max safe no-load speed)
Rated Cooling Flow：92 L/min (standard rated flow for heat dissipation)
Minimum Idle Flow：21 L/min (low flow energy-saving idle setting)
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
Working Temperature Range：-28℃ ~ +112℃ (adapt to plateau cold and hot mining environment)
Sealing Grade：High temp dynamic sealing, low internal volumetric leakage
Main Material：Alloy reinforced cast iron housing, carburized quenched piston & swash plate, multi-stage FKM stack seal
Net Weight：Approx 15KG
Application：Hydraulic power supply for bulldozer cooling fan motor

advantage

• 38cc axial piston pump with independent thermal sensing regulator, separate cooling circuit design will not interfere working hydraulic system, avoiding mutual disturbance between pushing operation and heat dissipation.
• Alloy reinforced cast iron pump shell delivers good thermal shock resistance, suppresses vibration and stress deformation in rugged mining construction, extend pump service life.
• Carburized quenched piston and swash plate pair maintains stable volumetric efficiency under repeated temperature fluctuation, slow wear rate under long continuous mining shift.
• Multi-layer FKM stacked seal withstands sustained high temperature inside pump cavity, effectively reduces internal leakage and shaft oil seepage under cyclic thermal load.
• Temperature response curve optimized for D275A heavy mining condition, fan speed changes smoothly without abrupt jump, lowering vibration of fan assembly.
• Two interchangeable part numbers with same installation dimension, flexible spare parts stocking and on-site replacement, reduce inventory pressure.
• Verified by thermal cycle and pressure impulse bench tests, stable performance under alternating cold and hot plateau mining environment.

FAQ 

Q1: Which equipment does 708-1T-00420 /708-1T-00421 fan pump fit?
A1: This hydraulic fan pump is suitable for Komatsu D275A-5, D275A-5D heavy bulldozers. 708-1T-00420 and 708-1T-00421 can be cross used. Confirm machine serial number before purchase.

Q2: What is the core function of this fan pump?
A2: It is the dedicated hydraulic power source for D275A bulldozer cooling fan circuit, independent of working hydraulic main pump. It converts engine mechanical energy into hydraulic energy and drives fan motor. The temperature sensing valve automatically adjusts flow and fan speed to control coolant and hydraulic oil temperature, preventing overheating during rock pushing and mining operation.

Q3: What inspections need to be completed before installing a new fan pump?
A3: Replace contaminated hydraulic oil and filter elements, clean the cooling circuit pipeline. Inspect fan motor, relief valve and temperature sensing valve for sticking or damage. Check pipeline for blockage or crack. After installation, fully bleed air from cooling hydraulic circuit before commissioning.

Q4: Bulldozer still overheats after replacing fan pump, what are the possible reasons?
A4: Overheating is not always caused by fan pump failure. Check radiator core clogging by rock dust, fan motor internal wear, relief valve pressure drift, filter blockage, air trapped inside cooling circuit, or temperature sensing valve stuck.

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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