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SBS80 CAT E311D2 E312D2 E313D2 E315D2GC Excavator Main Hydraulic Piston Pump for 391-9442

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Guangzhou Kawo Construction Machinery Co.,Ltd.

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Product Name : Hydraulic Pump Assembly

MOQ : 1 set

Transportation Method : DHL, UPS, FedEx, Sea Freight

Delivery Time : 3-8 days

Supply Ability : 300 Sets / Month

Price : Negotiable

Packaging Details : Wooden Case / Cartonwith Foam Protection, or as Required

Part No : 391-9442

Payment Terms : Western Union, T/T, Assurance

Condition : New / Rebuilt

Warranty : 6 Months

MOQ : 1 Set

Model Number : E311D2 E312D2 E313D2 E315D2GC

Place of Origin : China

Brand Name : CAVOYD

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Common Faults & Diagnosis

Slow operation when hot, weak digging: Worn valve plate, cylinder, or piston slipper; excessive internal leakage caused by oil contamination.
Engine bogging under heavy load: Stuck or worn regulator servo parts; abnormal power control.
Pump squeal & vibration: Suction air leak, blocked filter (cavitation), or damaged bearing.
Low pressure & poor combined action: Worn servo valve or stuck regulator spool.
Seal leakage: Aged seals, housing defects, or damaged mating surfaces.

Important: Metal powder in the oil indicates severe wear. Clean the oil circuit and replace filters when changing the pump.

Purchase Tips

Confirm the part number — it is not interchangeable with other models.
Available Options

Original new: Reliable, high cost, long lead time.

OEM new: Cost-effective for export; ask for a pressure test report.

Rebuilt: Budget choice; confirm warranty terms.

Used pump: High risk — not recommended for export.
Test pump pressure first to exclude valve or pilot pump faults.
Buy hydraulic oil, filters, and a seal kit together.
Export: Fumigated wooden crate with test report.
Warranty excludes damage from dirty oil, air ingress, and incorrect installation.

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391-9442 main piston pump

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