Hydraulic Pump Assembly - Fan Pump

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

3 year

Product details

1. Part Information

• Part Number: 708-1S-00290

• Component Type: Hydraulic Pump Assembly (Fan Pump)

• Function: Powers the cooling fan system in Komatsu crawler dozers, ensuring optimal engine and hydraulic system temperatures under heavy-duty operation.

2. Compatible Models

• D65EX Crawler Dozer

• Engine: Komatsu SAA6D107E-1 (Tier 3 compliant)

• Operating Weight: ~18,500 kg

• Applications: Medium-scale earthmoving, grading, and land clearing.

• D65PX Crawler Dozer

• Engine: Same as D65EX (SAA6D107E-1)

• Operating Weight: ~19,200 kg (with additional counterweight)

• Applications: Heavy-duty dozing, ripping, and slope work.

3. Technical Specifications

【表格】

Parameter Details

Flow Rate ~120 L/min (at rated engine speed)

Pressure Rating 210 bar (continuous), 240 bar (peak)

Drive Type PTO (Power Take-Off) from main engine

Mounting Direct bolt-on to engine gearbox

Seal Type Double-lip nitrile rubber (NBR) seals

Weight ~28 kg

4. Key Features

• High-Efficiency Design: Optimized for Komatsu’s Tier 3 engines, reducing fuel consumption by up to 8% compared to older models.

• Durability: Hardened steel gears and ceramic-coated bearings for extended service life in abrasive environments.

• Easy Maintenance: Quick-access filter and replaceable seal kit (Part No. 708-1S-00291).

• Noise Reduction: Helical gear design minimizes vibration and noise (<85 dB at 1m distance).

5. Common Issues & Solutions

【表格】

Symptom Possible Cause Solution

Fan not rotating Low hydraulic pressure, worn pump Check pressure at pump outlet (should be ≥180 bar). Replace pump if internal leakage exceeds 5%.

Excessive noise Worn gears, misaligned shaft Inspect gear tooth wear (replace if pitch line error >0.1mm). Realign shaft per Komatsu TS-0023 guide.

Oil leakage Aged seals, cracked housing Replace NBR seals with Komatsu-approved kit (708-1S-00291). Weld housing cracks (use E7018 electrode).

Overheating Clogged filter, air in system Replace suction filter (Part No. 708-2K-0012). Bleed air from reservoir per Service Bulletin SB-2021-05.

6. Replacement Procedure

1. Preparation:

• Park machine on level ground, engage parking brake, and lower blade.

• Relieve hydraulic pressure by cycling controls 5–10 times.

2. Removal:

• Disconnect hydraulic hoses (label for reassembly).

• Remove mounting bolts (4x M12×30, torque spec: 85 N·m).

• Extract pump using a hydraulic jack (avoid prying housing).

3. Installation:

• Clean mating surfaces with emery cloth (grit #220).

• Apply Loctite 243 to bolts and torque to 85 N·m in a star pattern.

• Reconnect hoses with new O-rings (Part No. 708-3A-0045).

4. Testing:

• Start engine and run at idle for 5 minutes. Check for leaks.

• Verify fan speed matches specifications (1,200–1,500 RPM at rated engine speed).

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

Audited supplier

3 year

Main Product: hydraulic motor, gear box, hydraulic pump, hydraulic valve , hydraulic winch, hydraulic system

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