Caterpillar 336C/D Hydraulic Pump

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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Product details

Caterpillar 336C/D Hydraulic Pump

Applicable Models: Cat 336C / 336D / 336DL Excavator

OEM Part Numbers: 283-6116, 322-8733, 504-5477, 469-4091

Kawasaki Model: K5V160DP (Tandem Variable Displacement Piston Pump)

1. Core Technical Parameters (Mainly for 336D)

- Structure: Tandem variable displacement piston pump (main pump + auxiliary pump) with Load Sensing (LS) system

- Rated Drive Speed: 1800 rpm (C9 engine)

- Total Flow Rate: 2 × 280 L/min = 560 L/min (148 gpm)

- System Pressure:

- Main Circuit & Working Device: 350 bar (5076 psi)

- Travel Circuit: 350 bar

- Swing Circuit: 280 bar (4061 psi)

- Pilot Pressure: 39 bar (565.7 psi)

- Matched Engine: C9 direct injection diesel engine, 200 kW (268 hp)

2. Differences Between 336C and 336D

Cat 336C

- Pump Model: Kawasaki K5V160DT

- Control Mode: Early hydraulic load sensing control

- Working Pressure: 320 bar

Cat 336D

- Pump Model: Kawasaki K5V160DP (with electric proportional control)

- Control Mode: Electro-hydraulic hybrid load sensing + electronic power limiting

- Working Pressure: 350 bar, featuring larger flow and faster response

3. Hydraulic System Features

- Dual pump confluence: Delivers high flow and rapid response for heavy-duty excavation operations.

- Load Sensing (LS): Supplies oil on demand to reduce fuel consumption and heat generation.

- Electro-hydraulic control (336D): Interlocks with ECM for precise flow distribution.

- High-strength ductile iron housing; equipped with hardened pistons and bronze valve plates.

- Standard SAE flange and 15-tooth spline shaft for direct replacement.

4. Application & Replacement Options

- Genuine Parts: 283-6116, 322-8733, 504-5477 (Manufactured by Kawasaki, Japan)

- Domestic Equivalent: Replicated K5V160DP pump, price range: 38,000 – 50,000 CNY

- Matching Equipment: 36-ton class excavators 336C/D/DL, fitted with C9 engine

5. Common Faults & Maintenance Guidelines

Common Malfunctions

- Insufficient pressure: Stuck LS valve, worn pistons, scratched valve plates, faulty electric proportional valve

- Abnormal noise and vibration: Damaged bearings, blocked suction strainer, contaminated hydraulic fluid, worn coupling

Maintenance Tips

- Recommended hydraulic oil: ISO VG46, replace every 500 operating hours

- Replace high-pressure filter, return line filter and pilot filter simultaneously

- Keep hydraulic fluid cleanliness within NAS Class 8 to prevent wear of precision components

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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