Komatsu PC78 (without dozer blade) hydraulic pump

3 week ago

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

3 year

Product details

1. Basic Product Information

• Applicable Model: Komatsu PC78 Hydraulic Excavator (Dozer-less Version)

• Operating Weight: Approx.7.8–8.2 tons(varies by configuration)

• Engine Model: Komatsu 4D95E or equivalent (confirm based on serial number)

• Hydraulic Pump Type:

• Main Pump: Twin variable-displacement piston pump (axial piston type)

• Auxiliary Pump: Gear pump (for pilot control, lubrication, etc.)

• Function:

• Supplies high-pressure oil to the excavator’s hydraulic system (travel, swing, boom, bucket, etc.).

• Dozer-less version omits the blade hydraulic circuit, resulting in a more compact pump assembly.

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2. Key Technical Specifications

【表格】

Parameter Specification

Main Pump Displacement 2 × ~45–55 mL/r (total flow: ~90–110 L/min @ 2200 rpm)

System Pressure 28–30 MPa (max. 32 MPa)

Speed Range 600–2200 rpm (engine-matched)

Control Method Negative Flow Control (NFC)

Weight ~85–100 kg (includes pump body, valve block, and mounting bracket)

Port Size SAE standard flange (4-bolt or 6-bolt)

Hydraulic Oil Requirement ISO VG 46 anti-wear hydraulic oil (cleanliness: NAS 1638 Class 9 or ISO 4406 19/17/14)

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3. Structural Features

• Main Pump Design:

• Dual-pump combined flow design for independent or simultaneous operation (e.g., swing + travel).

• Variable displacement adjusted via swashplate angle to adapt to load changes.

• Dozer-less Optimization:

• Eliminates blade hydraulic valve block, reducing plumbing complexity.

• Pump outlets connect only to travel, swing, and attachment circuits (boom/bucket/arm).

• Sealing & Durability:

• Dual lip seals (prevents high-pressure oil leakage).

• Cast iron pump body (impact-resistant); some models use aluminum housing (weight reduction).

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4. Common Failures & Solutions

【表格】

Symptom Possible Cause Solution

Low pressure/flow Internal leakage, stuck variable mechanism Replace worn plungers/port plates; clean variable piston

Abnormal noise/vibration Bearing failure, cavitation, contaminated oil Replace bearings; check suction filter; bleed air

High oil temperature Clogged cooler, pump efficiency loss Clean radiator; inspect internal leakage

Pump body leakage Aged seals, pump body cracks Replace seals; repair cracks (professional welding required)

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5. Maintenance Recommendations

• Daily Checks(every 250 hours):

• Verify hydraulic oil level and quality (check odor/color).

• Clean suction strainer to prevent debris ingress.

• Periodic Service(every 1000 hours):

• Replace hydraulic oil and filters (filter precision ≤10μm).

• Inspect axial clearance (standard: 0.05–0.15mm).

• Long-Term Storage(＞1 month):

• Manually rotate pump shaft 2–3 turns before startup to prevent rust.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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