CAT 4489705 (448-9705) Piston Pump | Fits 374F 374F L 390F 390F L
CAT 4489705 (448-9705) Piston Pump | Fits 374F 374F L 390F 390F L
CAT 4489705 (448-9705) Piston Pump | Fits 374F 374F L 390F 390F L
Premium hydraulic piston pump designed as a direct OEM-compatible replacement for Caterpillar 374F, 374F L, 390F, and 390F L hydraulic excavators. Built to deliver consistent hydraulic performance and long service life in demanding mining, quarry, heavy construction, and large-scale earthmoving applications.
Product Highlights
- Part Number: 4489705 / 448-9705
- Direct Fit: No modifications required
- High Performance: Meets or exceeds original Caterpillar specifications
- Durable Construction: Precision-engineered for long service life
- Wide Application: Suitable for mining, quarry, heavy construction, and earthmoving projects
Technical Specifications
- Part Number: 4489705 / 448-9705
- Product Type: Variable Displacement Piston Pump
- Brand Compatibility: Caterpillar (CAT)
- Application: Hydraulic System
- Warranty: 12 Months
Compatible Models
This piston pump fits the following Caterpillar excavators:
- Caterpillar 374F Hydraulic Excavator
- Caterpillar 374F L Hydraulic Excavator
- Caterpillar 390F Hydraulic Excavator
- Caterpillar 390F L Hydraulic Excavator
Applications
- Excavator Boom and Arm Hydraulic Control
- Hydraulic Cylinder Actuation and Control
- Hydraulic Swing and Travel Systems
- Mining, Quarry, Heavy Construction, and Large-Scale Earthmoving Projects
Why Choose This Pump?
- Quality Guaranteed - Manufactured to meet OEM standards
- Ready to Ship - In stock and available for immediate dispatch
- Expert Support - Technical assistance available
- Competitive Pricing - Cost-effective alternative to dealer parts
Frequently Asked Questions
Q: What are the symptoms of a failing hydraulic piston pump on CAT 374F, 374F L, 390F, or 390F L excavators?
A: Common signs include slow or weak boom, arm, and bucket response, the excavator struggling to dig or lift under load, hydraulic oil overheating during normal operation, whining or knocking noise from the pump area, and visible hydraulic fluid leakage. The 374F/374F L and 390F/390F L are large 50–90 ton class excavators used in heavy mining, quarry, and massive earthmoving operations — pump failure causes severe productivity loss and should be addressed immediately.
Q: Does the 4489705 fit all four excavator models?
A: Yes, the 4489705 (448-9705) is designed as a direct OEM-compatible replacement for the CAT 374F, 374F L, 390F, and 390F L hydraulic excavators. All four are large mining-class excavators sharing the same pump mounting and hydraulic system architecture. Contact us with your excavator serial number to confirm exact compatibility.
Q: What hydraulic functions does this pump support on these large excavators?
A: As the main hydraulic pump on 50–90 ton excavators, it supplies flow to all major hydraulic circuits — boom, arm, bucket, swing, and travel functions. A failing main pump causes weak or slow operation across all functions simultaneously. Given the size and cost per hour of these machines, pump issues should be diagnosed and addressed promptly to avoid expensive downtime.
Q: Should I flush the hydraulic system when replacing this pump on a large mining excavator?
A: Always, and with extra diligence. Large excavators like the 374F and 390F operate under extreme continuous load in mining applications. Metal particles and contaminants from the old pump can destroy the new pump within hours. Drain and replace all hydraulic oil, flush the system thoroughly with clean oil, replace all filters, and refill with fresh Cat HYDO Advanced hydraulic oil. We strongly recommend professional installation by a qualified technician or CAT dealer service center.
Q: What type of hydraulic oil is recommended for the 374F, 374F L, 390F, and 390F L?
A: Caterpillar specifies Cat HYDO Advanced 10W or 30W depending on ambient operating temperature. For 50–90 ton mining excavators operating under constant heavy load, using non-CAT approved hydraulic fluids can cause immediate pump failure, accelerated wear, and void the warranty.
Q: How do I confirm this is the correct pump for my excavator?
A: Check the part number on your current hydraulic pump — if it reads 4489705 or 448-9705, this is the correct replacement. If the label is worn or missing, provide your excavator serial number and we will verify compatibility before you order.
Q: Does this pump come with mounting hardware or gaskets included?
A: The pump is supplied as a complete unit. Depending on your excavator configuration, you may need separate mounting bolts, gaskets, or O-rings. Contact us with your serial number and we will confirm exactly what is included and what additional parts you may need for installation.
Q: What is the warranty on this hydraulic piston pump?
A: This piston pump comes with a 12-month warranty covering manufacturing defects. The warranty does not cover damage caused by contaminated hydraulic oil, improper installation, failure to flush the hydraulic system, or using non-CAT approved hydraulic fluids.
Looking for this hydraulic pump? Contact us today for pricing, availability, and lead time information.
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