# Caterpillar 631K for Sale in San Antonio, TX **URL:** ## Listing details - **Price:** $389,000.00 USD - **Listing ID:** 73179657 - **Manufacturer:** Caterpillar - **Model:** 631K - **Category:** Scrapers - **Type:** Open Bowl Scrapers - **Hours:** 8142 - **Serial number:** WTR00128 - **Location:** San Antonio, TX ## Description Air Conditioner, Coal Bowl, Cushion Hitch, Emissions Level - EPA - EPA TIER 4f, Emissions Level - EU - EU STAGE IV, Fire Extinguisher, Guard, Transmission, Lighting, Mirrors, Online Owner's Manual , Product Link, Radio - Bluetooth, Regulatory Status - EPA / ARB / EU / R120 / S. Korea, Retarder, ROPS - Enclosed, Scraper, Coal, Ultra Low Sulfur Diesel Fuel ## Machine details ### GENERAL APPEARANCE - **Cleaning Required:** Yes ### SAFETY ITEMS - **ROPS:** Yes - **Safety Decals In Place:** Yes - **Safety Decals Legible:** Yes ### OPERATOR STATION - **Back Up Alarm:** Yes - **Current O&MM:** No - **Current Parts Manual:** No - **Current Safety Manual:** No - **ROPS Certification Plate:** Yes ### FRONT ENGINE - **Blow By - FRONT ENGINE:** No - **Compression in Radiator - FRONT ENGINE:** No - **Emissions Decal - FRONT ENGINE:** No - **Fluid Levels OK? - FRONT ENGINE:** Yes - **Knocking - FRONT ENGINE:** No - **Oil Leaks - FRONT ENGINE:** No - **Water In Oil - FRONT ENGINE:** No ### FRONT COOLING SYSTEM - **Leaks - FRONT COOLING SYSTEM:** No ### FRONT ELECTRICAL, STARTING & CHARGING SYSTEM - **Alternator - FRONT ELECTRICAL, STARTING & CHARGING SYSTEM:** Good - **Batteries / Cables - FRONT ELECTRICAL, STARTING & CHARGING SYSTEM:** Good - **Lighting - FRONT ELECTRICAL, STARTING & CHARGING SYSTEM:** Good - **Pre-Heater - FRONT ELECTRICAL, STARTING & CHARGING SYSTEM:** Good - **Starter - FRONT ELECTRICAL, STARTING & CHARGING SYSTEM:** Good - **Wiring - FRONT ELECTRICAL, STARTING & CHARGING SYSTEM:** Good ### FRONT TRANSMISSION - **Leaks - FRONT TRANSMISSION:** No - **Transmission - Noisy - FRONT TRANSMISSION:** No ### STEERING - **Steering Cylinder:** Good - **Steering Linkage:** Good - **Steering Valves / Pumps:** Good ### BRAKE - **Leaks - BRAKE:** No ### HYDRAULICS - **Leaks - HYDRAULICS:** No ### SCRAPER - **Apron:** Good - **Bail:** Good - **Bowl:** Poor - **Cutting Edge:** Good - **Ejector:** Fair - **Ejector Rollers:** Good - **Floor:** Good ### SCRAPER HITCH/SUSPENSION AXLE - **Cushion Hitch Control Valve:** Good - **Cushion Hitch Cylinder:** Good - **Cushion Hitch Operation:** Good - **Cushion Hitch Pump:** Good - **H-Link Pins:** Good - **Horizontal Pins:** Good - **Vertical Pins:** Good - **Welds / Cracks:** Good ### FINAL DRIVES - **Leaks - FINAL DRIVES:** No ### TIRES - **Spare:** No ## About this model The Caterpillar 631K is a wheel tractor-scraper used in large-scale earthmoving, mining support, and highway construction. It is designed for high-volume material loading, hauling, and spreading in medium to long-distance applications. The 631K features a twin-engine scraper configuration with a bowl, apron, and ejector system for efficient cut, carry, and dump cycles. It is commonly used in mass excavation, site preparation, and land development where fast cycle times and high productivity are required. The machine is part of Caterpillar's K Series scraper lineup and is typically paired with a push tractor for loading in tougher ground conditions. ## Photos ![Caterpillar 631K](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz05Y2UxOWZiNmZlNDM0MGEwOTZjYTEzOWQ3MjdhZDhhZCYkdHh0PUhPTFQlMjBDQVQmNTgyNg==) ![Caterpillar 631K photo 2](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1jZDA5MTBmNTkzNTNhMGEyZGI1ODE2YmNhMGFiZGE1ZiYkdHh0PUhPTFQlMjBDQVQmNDI4NTE=) ![Caterpillar 631K photo 3](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1lNjRlNDdkOGNlMzk1YjQ2YjY2ZTMyOTkzOWJiOGM5OCYkdHh0PUhPTFQlMjBDQVQmMjMxNDg=) ![Caterpillar 631K photo 4](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1iNDI4ZmFkZTE2OTExZTFhOTNlNzBhMTQ3ODJmNGZlMiYkdHh0PUhPTFQlMjBDQVQmMzk1OTk=) ![Caterpillar 631K photo 5](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz05ZjM5Mzg5ZjBmYzkxMDdlZTEyMjczOWI0OTNlMTVlYiYkdHh0PUhPTFQlMjBDQVQmNDM4MQ==) ![Caterpillar 631K photo 6](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1lOTBjZWQ0NGZlOWU5YjRkODM2MTg2Mzc3YjlmOTIyMiYkdHh0PUhPTFQlMjBDQVQmNDYyMTM=) ![Caterpillar 631K photo 7](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1lZjY4NDcxZDBiMmEzZWMwZTcyOThkMDYxOTQ2MjRmMSYkdHh0PUhPTFQlMjBDQVQmNjEzOTc=) ![Caterpillar 631K photo 8](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1jNWFlZjUxNTIxZjBkZWM4ZTBmNjA5OWI3ZTA0MTc2ZiYkdHh0PUhPTFQlMjBDQVQmNDE2MTU=) ![Caterpillar 631K photo 9](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1kNzk5OTUwZjIyODdiYTFkY2E5MDBmMmU4ZWFiMzE3OSYkdHh0PUhPTFQlMjBDQVQmNjMwMTI=) ![Caterpillar 631K photo 10](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz05NWRhMWY1ZmViNWVlNTg5ZTk3NzIwMjEwMWRhMmM4ZiYkdHh0PUhPTFQlMjBDQVQmNDYxOTc=) ![Caterpillar 631K photo 11](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1hZThhZThkOWNiOTI1MzAzZjRmZDI2MzE3NDJiMDU4MSYkdHh0PUhPTFQlMjBDQVQmMjI2MQ==) ![Caterpillar 631K photo 12](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1mMDJiNjZjYWIzOWM4ZTM5Zjg2YTA2OWM2MWRhNzVhZCYkdHh0PUhPTFQlMjBDQVQmMjIxNTA=) ![Caterpillar 631K photo 13](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1mMmRiYTVjY2FlMjk4MmFkZGQxMzBlOTg1MDM0Y2YyYSYkdHh0PUhPTFQlMjBDQVQmNTM4NzI=) ![Caterpillar 631K photo 14](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1jMmRlNjA1NWM5YjU0NDBkOGQyNjRkZDI0NjZjNTU4NyYkdHh0PUhPTFQlMjBDQVQmMzM5MDk=) ![Caterpillar 631K photo 15](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz05Yjg0OWJmYjA2NTg5ZjcwYTdjODBiZGNmM2ZmZGNhYyYkdHh0PUhPTFQlMjBDQVQmMjUyNDU=) ![Caterpillar 631K photo 16](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz04MzBhNDA1M2JjZWZmOTMwOGY5Yzg3ZWQ1N2ZjNzljNyYkdHh0PUhPTFQlMjBDQVQmMTM5NDk=) ![Caterpillar 631K photo 17](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz05NWQ5MTg5OGM4YTNkNWQzYTEyMjRiNzg3NWM2ODc4ZSYkdHh0PUhPTFQlMjBDQVQmNTc0NA==) ![Caterpillar 631K photo 18](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1kNGIwNjg3MGY1YjVmY2M1YzIyMWI0MDcwNDUxMzljNCYkdHh0PUhPTFQlMjBDQVQmNTQ2OTA=) ![Caterpillar 631K photo 19](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1iNDY4YWE0NWZjMzgzNmY4YmI1Y2NhODJmNGVjMjQ0NyYkdHh0PUhPTFQlMjBDQVQmMzMyMjE=) ![Caterpillar 631K photo 20](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1jMzE2NTQwMjIyZjc2YWQ0ZjZiMmNlYmUwOWM2MmZkOCYkdHh0PUhPTFQlMjBDQVQmMTgyODk=) ![Caterpillar 631K photo 21](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1iZjViNTFiOTAzMWYxYzQ0Y2U2MGIwNzYzYTdmM2VlYiYkdHh0PUhPTFQlMjBDQVQmOTY1) ![Caterpillar 631K photo 22](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1lOGYwNzA4OGIxZWU5OGI1ZTljODAyZTkzMGE1NWFiMyYkdHh0PUhPTFQlMjBDQVQmMjQzNzQ=) ![Caterpillar 631K photo 23](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz04ZDU2MWZjMDBkYmUwM2FmZjBiYTFkZGFlOTU0NjY3MyYkdHh0PUhPTFQlMjBDQVQmMjA2OTY=) ![Caterpillar 631K photo 24](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1mM2QxNjJjYTBkMGI5ZWRlZjQ4OWI0NjEwOWRmYmMzNyYkdHh0PUhPTFQlMjBDQVQmMTQwOQ==) ![Caterpillar 631K photo 25](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz05ODQ5OGRiNmZjYTY2YjI5Yzk1NzAxNTUyYjNlY2ZhMCYkdHh0PUhPTFQlMjBDQVQmNDU2MA==) ![Caterpillar 631K photo 26](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1kYjQ4YmQ0MmEwY2E1MWUxYmQ0ZjdhZjc1YmE2ZjBkMiYkdHh0PUhPTFQlMjBDQVQmMjYwNzA=) ![Caterpillar 631K photo 27](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1mNjljOThjN2MwZjI2N2NhYzc3ZTliZDdiYzQ2MTFmYSYkdHh0PUhPTFQlMjBDQVQmMzA0ODc=) ![Caterpillar 631K photo 28](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1hODIzMmI0YmZlOTc5OTZlYWJhNTMwMDViOWE0ODY0YiYkdHh0PUhPTFQlMjBDQVQmNzg2OQ==) ![Caterpillar 631K photo 29](http://s7d2.scene7.com/is/image/CatUsedProduction/wtk?JHNyYz1iMTU0OWI1MGZjOTczYTJjOWQxZDZiZWM2ZDFkNmU5MyYkdHh0PUhPTFQlMjBDQVQmNTAwODA=)