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513-3691 CAT 349 Arm Cylinder (Rock Spec) Aftermarket Replacement
513-3691 CAT 349 Arm Cylinder (Rock Spec) Aftermarket Replacement
Heavy-Duty “Rock Spec” Arm Cylinder for CAT 349 Excavator.
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Part Number: 513-3691.
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Type: Reinforced Stick Cylinder for rock excavation.
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Durability: Thickened barrel & hardened rod.
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Fitment: Direct replacement for Caterpillar.
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Warranty: 1 Year Factory Warranty.
125-7832, 1257832, 129-7831, 1297831, 200-3525, 2003525, 20R-7499, 20R7499, 225-4525, 225-4526, 2254525, 2254526, 242-6837, 242-6838, 242-6839, 2426837, 2426838, 2426839, 358-8458, 358-8460, 358-8461, 3588458, 3588460, 3588461, 370-6692, 3706692, 513-3691, 5133691
The CAT349 Arm Cylinder (Rock Spec) is an extreme-duty hydraulic replacement engineered for the Caterpillar 349 and 349D/E/F series excavators. Replacing OEM Part Number 513-3691, this cylinder is manufactured to “Rock Specification” standards, meaning it features reinforced structural integrity to withstand the brutal vibration and impact of quarrying and hard rock excavation.
Unlike standard earthmoving cylinders, this Heavy-Duty Stick Cylinder utilizes a thickened barrel wall and an upgraded guide bushing system, making it the ideal choice for machines equipped with rock buckets or hydraulic breakers.
Technical Specifications
| Feature | Specification |
| Part Number | 513-3691 |
| Machine Compatibility | Caterpillar CAT 349 / 349D / 349F |
| Configuration | Rock Spec (Heavy Duty) |
| Position | Arm Cylinder / Stick Cylinder |
| Rod Material | 42CrMo4 Induction Hardened (HRC 55+) |
| Sealing System | NOK / Parker (High-Temp & Shock Resistant) |
| Tube Material | ST52 / E355 Reinforced Wall Thickness |
| Warranty | 12 Months / 2000 Hours |
| Condition | 100% New Manufacturing |
Key Features & Rock-Ready Performance
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Reinforced “Rock Spec” Design: Specifically built for severe-duty applications. The cylinder barrel is reinforced to resist ballooning under extreme pressure spikes caused by digging into blasted rock.
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Impact-Proof Rod: The piston rod undergoes deep induction hardening and chrome plating to resist surface pitting from flying rock chips and debris, ensuring seal longevity in abrasive environments.
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High-Load Bushings: Equipped with heavy-duty composite bushings to absorb the side-loads generated during aggressive crowding and prying actions.
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OEM Precision Fit: Manufactured to precise dimensions for part number 513-3691, ensuring a perfect pin-to-pin fit with the CAT 349 boom and stick linkage.
Applications
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Hard rock quarrying and mining
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Demolition sites
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Excavators equipped with hydraulic hammers/breakers
FAQ
Q1: Is SEIGO 513-3691 the exact same dimensionally as the Caterpillar OEM 513-3691?
A: Yes. Our 513-3691 matches every mounting dimension, port location, stroke length, and thread specification of the Caterpillar OEM part. It is a true drop-in replacement that requires no modification to your machine.
Q2: What is the lead time for 513-3691?
A: Standard lead time is 2-3 weeks from our Guangdong factory. For mining-emergency orders, our Rapid Production Track can deliver in 5-7 days (subject to stock availability). Air freight shipping adds 3-5 days to any major international airport.
Q3: Does your 513-3691 fit CAT 349D, 349E, and 349F models?
A: Yes. Part 513-3691 is the current superseded OEM number that fits all CAT 349 D/E/F variants with serial number prefixes GKE, RAS, RMX, FGE, KDX, THX, BZ2, and WGG. We recommend confirming your machine’s serial number with our engineering team before ordering.
Q4: What’s the difference between 513-3691 and 242-6837?
A: Part 513-3691 supersedes 242-6837 and is dimensionally identical. If your machine’s parts book lists 242-6837, you can order 513-3691 with no compatibility issues. We include both part numbers on the shipping label for your records.
