# Hydraulics ## Benefits of adding equipment Find factory fit parts and view diagrams. ### Select Equipment To find the parts that fit. ### Add Equipment To find the parts that fit. ## Category - [Hydraulic Accumulators & Components (1130)](https://parts.cat.com/en/catcorp/category/hydraulics-accumulators-components?page=1&sortBy=0) - [Hydraulic Cylinder Seal Kits (1002)](https://parts.cat.com/en/catcorp/category/hydraulics-cylinder-seal-kits?page=1&sortBy=0) - [Hydraulic Cylinders & Components (13526)](https://parts.cat.com/en/catcorp/category/hydraulics-cylinders-components?page=1&sortBy=0) - [Hydraulic Hammer Components (636)](https://parts.cat.com/en/catcorp/category/hydraulics-hammer-components?page=1&sortBy=0) - [Hydraulic Pumps, Motors, & Components (13984)](https://parts.cat.com/en/catcorp/category/hydraulics-pumps-motors-components?page=1&sortBy=0) - [Hydraulic Repair & Service Kits (670)](https://parts.cat.com/en/catcorp/category/hydraulics-repair-service-kits?page=1&sortBy=0) - [Hydraulic Tanks, Reservoirs, & Other Tank Components (1150)](https://parts.cat.com/en/catcorp/category/hydraulics-tanks-reservoirs-tank-components?page=1&sortBy=0) - [Hydraulic Valve Groups & Components (19395)](https://parts.cat.com/en/catcorp/category/hydraulics-valve-groups-components?page=1&sortBy=0) - [Other Hydraulic Components (8469)](https://parts.cat.com/en/catcorp/category/hydraulics-other-components?page=1&sortBy=0) ### Specifications **Bolt Length (in)** - 0.394 - 0.512 - 0.787 - 1.283 **Bolt Type** - Countersunk (flat) - Hex Head - Hex Head Bolt - Rounded Head (pan) **Bore Diameter (in)** - 0.4 - 0.99 - 1.18 - 1.19 **Class or Grade** - Iso 898-1 Class 10.9 - Iso 898-1 Class 12.9 - Iso 898-1 Class 8.8 - Iso 898-2 Class 8 ## Coating - Anodic Aluminum - Black Oxide - Chrome Plated - Hvof Coating ## Cross Section Diameter (in) - 0.07 - 0.079 - 0.098 - 0.102 ## Dash Size - 014 - 232 - 238 - 244 ## Depth (in) - 0.33 - 0.59 - 2.68 ## Diameter (in) - 0.04 - 0.05 - 0.07 - 0.08 ## Drive Type - Internal Hex ## Efficiency Rating - 70 Micron - 254 Micron ## Fits Bolt Sizes (in) - 1/2-13 - 1/4-20 - 1/4-28 - 3/4-10 ## Front Width (in) - 2.232 ## Grove Width (in) - 1.25 - 1.61 - 7.0 - 9.0 ## Height (in) - 0.078 - 0.09 - 0.1 - 0.109 ## Inside Diameter (in) - 0.024 - 0.12 - 0.125 - 0.14 ## Length (in) - 0.047 - 0.134 - 0.146 - 0.16 ## Material Hardness - 70a - 75a - 80a - 90a ## Mount Type - 2-bolt Flange - Four Hole (pcd 41mm) ## Number of Teeth - 8 - 10 - 11 - 12 ## Nut Type - Acorn - Hex - Hex Flange - Round (spanner Or Bearing) ## Outer Diameter (in) - 0.09 - 0.11 - 0.25 - 0.28 ## Outside Diameter (in) - 0.055 - 0.15 - 0.18 - 0.19 ## Overall Length (in) - 0.03 - 0.157 - 0.18 - 0.19 ## Overall Width (in) - 0.12 - 0.23 - 0.24 - 0.31 ## Pin Diameter (in) - 0.12 - 0.13 - 0.14 - 0.16 ## Pin End Thread Size - 3.5 Beco - 4 Beco - 4.5 Beco - 6 Beco ## Pin Type - Blind Hole - Cross Hole - Flag Pin - Hollow ## Pipe Diameter (in) - 5.0 - 5.5 - 6.5 - 7.0 ## Polymer - Acm (polyacrylate) - Fkm (fluorocarbon) - Nbr (nitrile Butadiene) - Nr (natural Rubber) ## Rear Height (in) - 1.909 ## Rear Width (in) - 1.909 ## Rod Diameter (in) - 0.2 - 0.24 - 0.3 - 0.31 ## Rod End Type - Spherical - Spherical Eye ## Screw Type - Hexagon Socket Setscrew ## Seal Shape - Integrated Bur - Type 1 - Type 2 - Type 3 ## Seal Type - 2-piece Piston Seal - Buffer Seal - Contamination Seal - Cushion ## Series - Large Size 85 ## Shank Diameter (in) - 4.02 ## Spring Type - Compression ## Thickness (in) - 0.002 - 0.005 - 0.01 - 0.0157 ## Thread Size (in - TPI) (in) - 1 - 1/16 - 12 - 1 - 14 - 1 1/16 - 12 - 1 1/16 - 12 STOR (2x) ## Track Tensioner Component Type - Cylinder ## Type - 90° Elbow Adapter - A/c Fitting With Low Side Charge Port - Accumulator Charging Valve - Ball Valve ## Voltage (volts) - 9 - 9-32 - 9-32 V - 9-32 Vdc ## Washer Type - Flat - Spring-conical ## Width (in) - 0.06 - 0.08 - 0.1 - 0.11 ## Sort By - Relevance - Name - Part number ### Specifications - US - Metric ### Bolt Length (in) - 0.394 - 0.512 - 0.787 - 1.283 ### Bolt Type - Countersunk (flat) - Hex Head - Hex Head Bolt - Rounded Head (pan) ## Bore Diameter (in) - 0.4 - 0.99 - 1.18 - 1.19 ## Class or Grade - Iso 898-1 Class 10.9 - Iso 898-1 Class 12.9 - Iso 898-1 Class 8.8 - Iso 898-2 Class 8 ## Coating - Anodic Aluminum - Black Oxide - Chrome Plated - Hvof Coating ## Cross Section Diameter (in) - 0.07 - 0.079 - 0.098 - 0.102 ## Dash Size - 014 - 232 - 238 - 244 ## Depth (in) - 0.33 - 0.59 - 2.68 ## Diameter (in) - 0.04 - 0.05 - 0.07 - 0.08 ## Drive Type - Internal Hex ## Efficiency Rating - 70 Micron - 254 Micron ## Fits Bolt Sizes (in) - 1/2-13 - 1/4-20 - 1/4-28 - 3/4-10 ## Front Width (in) - 2.232 ## Grove Width (in) - 1.25 - 1.61 - 7.0 - 9.0 ## Height (in) - 0.078 - 0.09 - 0.1 - 0.109 ## Inside Diameter (in) - 0.024 - 0.12 - 0.125 - 0.14 ## Length (in) - 0.047 - 0.134 - 0.146 - 0.16 ## Material Hardness - 70a - 75a - 80a - 90a ## Mount Type - 2-bolt Flange - Four Hole (pcd 41mm) ## Number of Teeth - 8 - 10 - 11 - 12 ## Nut Type - Acorn - Hex - Hex Flange - Round (spanner Or Bearing) ## Outer Diameter (in) - 0.09 - 0.11 - 0.25 - 0.28 ## Outside Diameter (in) - 0.055 - 0.15 - 0.18 - 0.19 View More ## Overall Length (in) - 0.03 - 0.157 - 0.18 - 0.19 View More ## Overall Width (in) - 0.12 - 0.23 - 0.24 - 0.31 View More ## Pin Diameter (in) - 0.12 - 0.13 - 0.14 - 0.16 View More ## Pin End Thread Size - 3.5 Beco - 4 Beco - 4.5 Beco - 6 Beco ## Pin Type - Blind Hole - Cross Hole - Flag Pin - Hollow View More ## Pipe Diameter (in) - 5.0 - 5.5 - 6.5 - 7.0 View More ## Polymer - Acm (polyacrylate) - Fkm (fluorocarbon) - Nbr (nitrile Butadiene) - Nr (natural Rubber) ## Rear Height (in) - 1.909 ## Rear Width (in) - 1.909 ## Rod Diameter (in) - 0.2 - 0.24 - 0.3 - 0.31 ## Rod End Type - Spherical - Spherical Eye ## Screw Type - Hexagon Socket Setscrew ## Seal Shape - Integrated Bur - Type 1 - Type 2 - Type 3 ## Seal Type - 2-piece Piston Seal - Buffer Seal - Contamination Seal - Cushion ## Series - Large Size 85 ## Shank Diameter (in) - 4.02 ## Spring Type - Compression ## Thickness (in) - 0.002 - 0.005 - 0.01 - 0.0157 ## Thread Size (in - TPI) (in) - 1 - 1/16 - 12 - 1 - 14 - 1 1/16 - 12 - 1 1/16 - 12 STOR (2x) ## Track Tensioner Component Type - Cylinder ## Type - 90° Elbow Adapter - A/c Fitting With Low Side Charge Port - Accumulator Charging Valve - Ball Valve ## Voltage (volts) - 9 - 9-32 - 9-32 V - 9-32 Vdc ### Washer Type - Flat - Spring-conical ## Width (in) - 0.06 - 0.08 - 0.1 - 0.11 --- **1 - 16 of 1200 results** ### [3B-8489: 1/8-27 PTF Hex Head Special Grease Fitting Adapter](https://parts.cat.com/en/catcorp/product/3B-8489) Cat® Grease Fitting Material Description: Plated Steel Length (in): 0.7 Material: Alloy Mixed: Metal, Alloy Steel, Carbon Steel, Alloy Zinc Height (in): 0.4 View Specifications --- ### [244-3114: Mdl Valve Group](https://parts.cat.com/en/catcorp/product/244-3114) Shop Cat® modulating valve assembly (24 VDC) hydraulic component for machines compatible with 244-3114. Length (in): 6.77 Material: Sealants / Adhesives Adhesive Hex Size (in): 0.76 Width (in): 2.28 Height (in): 2.9 View Specifications --- ### [6V-3965: 9/16" Thread Quick Disconnect Nipple](https://parts.cat.com/en/catcorp/product/6V-3965) Cat® 9/16" Thread Quick Disconnect Rubber Nipple with STOR Material Description: Plated Steel Material: Alloy Zinc, Nitrile / NBR / HNBR / XNBR Rubber, Alloy Steel, Carbon Steel, Fluoroelastomer (FKM) Rubber View Specifications --- ### [6V-7238: 3/4" Thread Shutoff Valve](https://parts.cat.com/en/catcorp/product/6V-7238) Cat® 3/4" Thread Brass Shutoff Valve with NPTF Male Stud And Hose Bead Material Description: Brass Length (in): 2.8 Material: Alloy Brass, Alloy Steel, Alloy Copper Height (in): 1.0 View Specifications --- ### [307-3245: Lubricant Injector](https://parts.cat.com/en/catcorp/product/307-3245) Cat® Lubricant Injector used in Lube Distribution Valve Material Description: Steel Length (in): 8.72 Width (in): 1.18 Material: Carbon Steel Height (in): 1.2 View Specifications --- ## 153-2994: 7/8" STOR Hydraulic Hoses Coupling Enhance performance with Cat's reliable hydraulic hoses coupling, engineered to achieve high efficiency in your most demanding applications. ### Material Description Plated Steel ### Material Alloy Zinc, Alloy Steel, Carbon Steel --- ## [440-2667: 5/8-18 3A Suspension Cylinder Charging Valve](https://parts.cat.com/en/catcorp/product/440-2667) Cat® 5/8-18 3A Thread Suspension Cylinder Charging Valve used in Front Suspension. ### Material Description Steel ### Overall Length (in) 1.86 ### Hex Size (in) 0.875 ### Thread Size (in) 5/8-18 ### Material Carbon Steel --- ## [373-6968: 38mm Diameter Quick Coupler](https://parts.cat.com/en/catcorp/product/373-6968) Cat® 38mm Diameter Quick Coupler with Female End used in Hydraulic Fitting. ### Material Description Plated Steel ### Material Carbon Steel, Alloy Zinc --- ## [20R-2009: Cat® Reman Double Piston Pump](https://parts.cat.com/en/catcorp/product/20R-2009) Cat Reman Double Piston Pump (Variable Displacement). ### Length (in) 48.6 ### Material Sealants / Adhesives Adhesive ### Height (in) 23.0 --- ## [590-2533: Dual Slack Adjuster](https://parts.cat.com/en/catcorp/product/590-2533) Shop Cat® dual slack adjuster for the rear brakes of machines compatible with 590-2533. This part has a 257.3 mL/side maximum displacement. ### Material Steel, Oil Fluid, Carbon Steel ### Standard Color Cat Yellow ### Dimensions (in) 9.7 X 6.9 X 4.8 ### Hole Size (in) 0.56 (2X) --- ## [351-8204: Bushing-Spherical](https://parts.cat.com/en/catcorp/product/351-8204) Find premium spherical bearing bushing and more with Cat. Explore reliable heavy-duty components like alternators and batteries for your needs. ### Material Not specified ### Outside Diameter (in) 4.13 ### Overall Length (in) 7.68 ### Hole Size (in) 0.98 (2X) --- ## [468-8825: Engine Head Exhaust Valve](https://parts.cat.com/en/catcorp/product/468-8825) Cat® Coated Engine Exhaust Valve used in Cylinder Head. ### Material Alloy Chromium, Alloy Steel --- ## [10R-5466: Cat® Reman Axial Piston Motor Fixed Displacement](https://parts.cat.com/en/catcorp/product/10R-5466) Cat® Reman Axial Piston Motor Fixed Displacement. ### Length (in) 27.5 ### Height (in) 20.0 --- ## [482-7524: Drive Group-Circle](https://parts.cat.com/en/catcorp/product/482-7524) Cat® Circle Drive Group. ### Material Sealants / Adhesives Adhesive, Acrylic Adhesive --- ## [396-4129: 29 Liter Compressed Nitrogen Gas Accumulator](https://parts.cat.com/en/catcorp/product/396-4129) ## [396-4129: 29 Liter Compressed Nitrogen Gas Accumulator](https://parts.cat.com/en/catcorp/product/396-4129) Accumulator Cat Length (in) 75.8 Material Carbon Steel Height (in) 7.0 --- View Specifications ## [468-8824: Engine Head Inlet Valve](https://parts.cat.com/en/catcorp/product/468-8824) Cat® Coated Inlet Valve used in Engine Cylinder Head Cat Material Alloy Steel, Alloy Chromium --- View Specifications ## Key ### Factory Fit This part is designed to fit your Cat equipment based on the manufacturer’s specifications. Any changes to the manufacturer’s configuration might result in the product not fitting your Cat equipment. Please consult your Cat Dealer before purchasing to ensure that this part is appropriate for your Cat equipment in its current condition and assumed configuration. This indicator cannot guarantee compatibility for all parts. - Remanufactured - Non-Returnable - Kit ### Replaced --- ### Features and Benefits Customer demand for faster, more powerful, and easier-to-operate equipment has resulted in the increased use and sophistication of hydraulic products. With a growing portion of equipment operating costs linked to the hydraulic system, decisions regarding system repair and maintenance are more important than ever. Caterpillar designs and manufactures hydraulic components to work as a system to meet the unique demands of Cat® equipment. High-quality materials, carefully controlled manufacturing processes, and Cat hydraulic components deliver maximum performance and value over the life of your equipment. Effective management of the hydraulic system helps keep machines at peak productivity while reducing downtime and operating costs. Understanding the elements of hydraulic system management can help maintain system efficiency, extend component life, and address problems to reduce unplanned repairs and unscheduled downtime. All hydraulics are uniquely designed and rigorously tested to ensure high performance, improved efficiency, and long service life on Cat machines. Cat hydraulic components are highly integrated into the hydraulic system and are crucial to machine performance, durability, and operator feel. Caterpillar offers several repair options for a wide range of needs and budgets, including resealing, rebearing, repairing, rebuilding, replacing with Cat Reman, or replacing with new. These options are backed by the Caterpillar Limited Warranty, giving you peace of mind when selecting a repair option. --- ## Cat® Hydraulics Parts Frequently Asked Questions **What are the most commonly replaced hydraulic parts on excavators and dozers?** The most commonly replaced hydraulic parts on Cat excavators and dozers include cylinder seals, hydraulic hoses and fittings, pump and motor components, control valve seals, and hydraulic filters. These are high-wear items that degrade over time and should be monitored as part of a planned maintenance program. **How do I find the right hydraulic part for my machine without the part number?** The most reliable method is to use your machine's serial number on the Cat Parts Store. This filters parts to those compatible with your specific model and configuration. The parts diagram view shows component locations and part numbers in context, making identification straightforward. **What types of hydraulic components does Caterpillar offer?** Caterpillar offers a full line of hydraulic components necessary to ensure your machine operates at peak performance and peak efficiency. From hydraulic hoses and seals to complete hydraulic cylinders, pumps, motors, and valves, Caterpillar has your equipment covered. We also offer lower-level piece parts to enable our components to be rebuilt and Reman hydraulic components, giving our customers repair options that meet their specific business needs. **How do I know if a hydraulic issue is a parts problem or a system problem?** Hydraulic problems on Cat equipment can point to seal or hose failures, contaminated fluid, pump wear, or control valve issues. External leaks may indicate seal or hose problems; slow or weak cylinder movement can point to pump wear or internal cylinder seal failure. --- ### Reference - [PEGP6028: Cat Hydraulic System Management Guide](https://caterpillar.scene7.com/is/content/Caterpillar/CM20150610-32417-43961) - [PEHJ0238: Cat Hydraulic System Support](https://caterpillar.scene7.com/is/content/Caterpillar/CM20150610-32417-63337) - [PEDJ1271: UltraLife Sealing System](https://caterpillar.scene7.com/is/content/Caterpillar/CM20260514-bdc28-34c42) - [PEDJ1622: UltraLife Cylinder Rod Coating](https://caterpillar.scene7.com/is/content/Caterpillar/CM20260514-a62e4-d917f) - [PEXQ1549: UltraLife Cylinder Rod Coating USP](https://caterpillar.scene7.com/is/content/Caterpillar/CM20260514-c6604-6c824) - [PEXQ1589: UltraLife FAQ](https://caterpillar.scene7.com/is/content/Caterpillar/CM20260514-4d2c7-b37fe) ### Videos - [How to Prevent Hydraulic Cylinder Contamination](https://www.youtube.com/watch?v=57Z1ssrLcOE) - [How to Inspect Your Cat® Hydraulic System](https://www.youtube.com/watch?v=P0lqsdajd1o) - [Extending Component Life through Contamination Control](https://www.youtube.com/watch?v=LIF7Q3H289c) - [Fluid Contamination, "The Silent Thief"](https://www.youtube.com/watch?v=0-qPSi-jd64) ## Products ### [153-2994: 7/8" STOR Hydraulic Hoses Coupling](https://parts.cat.com/en/catcorp/product/153-2994) Enhance performance with Cat's reliable hydraulic hoses coupling, engineered to achieve high efficiency in your most demanding applications. - Cat - Material Description - Plated Steel - Material - Alloy Zinc,Alloy Steel,Carbon Steel ## Product Pages Page 1 of 75 — showing results 1–16 of 1,200. - [Next page (2)](https://parts.cat.com/en/catcorp/category/hydraulic?page=2) - [Last page (75)](https://parts.cat.com/en/catcorp/category/hydraulic?page=75)