CAT 512-0949 (512-0949) Motor GP-Piston | Fits 340 336 MHPU 352 349 336 345 GC 352 UHD Excavator

CAT 5120949 (512-0949) Piston Motor | Fits 340 336 MHPU 352 349 336 345GC 352 UHD Excavator

Premium hydraulic piston motor designed as a direct OEM-compatible replacement for Caterpillar 340, 336 MHPU, 352, 349, 336, 345GC, and 352 UHD excavators. Built to deliver reliable drive power and long service life in demanding mining, quarry, demolition, and heavy excavation applications.

Product Highlights

• Part Number: 5120949 / 512-0949
• 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, demolition, and heavy excavation projects

Technical Specifications

• Part Number: 5120949 / 512-0949
• Product Type: Hydraulic Piston Motor
• Brand Compatibility: Caterpillar (CAT)
• Application: Hydraulic System
• Warranty: 12 Months

Compatible Models

This piston motor fits the following Caterpillar excavators:

• Caterpillar 340 Excavator
• Caterpillar 336 MHPU Material Handler
• Caterpillar 352 Excavator
• Caterpillar 349 Excavator
• Caterpillar 336 Excavator
• Caterpillar 345GC Excavator
• Caterpillar 352 UHD Ultra High Demolition Excavator

Applications

• Excavator Travel Drive System
• Excavator Propel and Traction Functions
• Heavy-Duty Digging and Demolition Operations
• Mining, Quarry, Demolition, and Heavy Excavation Projects

Why Choose This Motor?

• 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 motor on CAT 340, 336 MHPU, 352, 349, 336, 345GC, or 352 UHD excavators?
A: Common signs include slow or failed swing/rotation, the excavator upper structure failing to rotate smoothly, travel drive becoming sluggish or non-responsive, hydraulic oil overheating during operation, whining or grinding noise from the motor area, and visible hydraulic fluid leakage. These are large excavators (including the 352 UHD ultra-high demolition version) used in heavy construction, demolition, and excavation — piston motor failure causes loss of swing or travel capability, severely limiting machine functionality and jobsite safety.

Q: Does the 5120949 fit all seven excavator models?
A: Yes, the 5120949 (512-0949) is designed as a direct OEM-compatible replacement for the CAT 340, 336 MHPU, 352, 349, 336, 345GC, and 352 UHD excavators. These models share the same motor mounting and hydraulic system architecture. Contact us with your excavator serial number to confirm exact compatibility.

Q: What hydraulic functions does this piston motor support on these excavators?
A: The 5120949 piston motor is typically used for swing drive (rotating the upper structure) and/or travel drive (propeling the excavator). A failing swing motor causes the excavator to rotate slowly or not at all — this severely impacts digging efficiency and cycle times. A failing travel motor causes sluggish or failed track movement. The 352 UHD is an ultra-high demolition excavator — swing and travel precision are critical for safe demolition work at height. Motor failure on this machine is a serious safety risk.

Q: Should I flush the hydraulic system when replacing this piston motor on a large excavator?
A: Always, and with extra diligence. Large excavators like the 340, 352, and 352 UHD operate under extreme continuous load in demanding applications (heavy excavation, demolition). Metal particles and contaminants from the old motor can destroy the new motor 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. Professional installation is strongly recommended.

Q: What type of hydraulic oil is recommended for these CAT excavators?
A: Caterpillar specifies Cat HYDO Advanced 10W or 30W depending on ambient operating temperature. For large excavators in heavy excavation and demolition applications under constant heavy load, using non-CAT approved hydraulic fluids can cause immediate motor failure, accelerated wear, and void the warranty.

Q: How do I confirm this is the correct piston motor for my excavator?
A: Check the part number on your current piston motor — if it reads 5120949 or 512-0949, 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 piston motor come with mounting hardware or gaskets included?
A: The motor 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 motor?
A: This piston motor 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 motor? Contact us today for pricing, availability, and lead time information.

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