Hydraulic System Spare Parts for CAT 320D, 320D2, 336D & 345D Machines
OrePlus helps buyers source hydraulic system components for Caterpillar CAT 320D, 320D2, 336D and 345D excavators. Parts enquiries can include hydraulic pumps, control valves, cylinders, motors, filters, seal kits, hoses and related service components. Share the machine serial number and old-part details so fitment can be checked before an order is confirmed.
Quick answer: We can assist with sourcing the 20 hydraulic parts and component groups listed below for CAT 320D, CAT 320D2, CAT 336D and CAT 345D machines. The list is a practical enquiry and stock-planning guide, not a promise that every item is in stock or interchangeable across all models. Before purchasing, verify the part number and machine serial number against the correct parts diagram or Caterpillar parts lookup. Caterpillar’s parts tools support identification by machine details, and the manufacturer’s guides are model-specific. Caterpillar parts lookup · Caterpillar parts reference guides.
20 commonly requested CAT excavator hydraulic parts
The following categories cover frequently required hydraulic repair, planned maintenance and downtime-related enquiries. The exact assembly and part number can differ by model variant, serial number, market, production year and machine configuration.
| # | Hydraulic part or component group | Typical service need |
|---|---|---|
| 1 | Main hydraulic pump assembly / pump rotating group | Repair or replacement following wear, reduced output, noise or pressure concerns. |
| 2 | Main pump regulator and control components | For pump control and response-related service enquiries; confirm exact pump arrangement. |
| 3 | Pilot pump / pilot gear pump | Supports pilot hydraulic functions; confirm system layout and part reference. |
| 4 | Main control valve assembly or valve sections | For control-valve repair, leakage or function-related requirements. |
| 5 | Main relief and port relief valves | Pressure-control components requiring correct specification and calibration. |
| 6 | Pilot control / joystick valve components | For pilot-control maintenance and operator-command hydraulic functions. |
| 7 | Boom hydraulic cylinder | Assembly or repair requirement, subject to cylinder dimensions and machine configuration. |
| 8 | Arm / stick hydraulic cylinder | Assembly, rod, barrel or service-part enquiries matched to the installed cylinder. |
| 9 | Bucket hydraulic cylinder | Replacement or repair components matched to the machine and linkage setup. |
| 10 | Boom, arm and bucket cylinder seal kits | Seal replacement; identify the cylinder by part number or verified measurements. |
| 11 | Hydraulic hose and tube assemblies | Replacement of leaking, damaged or application-specific lines. |
| 12 | Hydraulic hose fittings, adapters and connectors | Match thread, size, pressure rating and connection type before supply. |
| 13 | Hydraulic oil cooler assembly / core | Cooling-system service or replacement, matched to the machine arrangement. |
| 14 | Hydraulic return filter elements | Planned maintenance; use the correct filter specification and service interval. |
| 15 | Pilot filter and hydraulic suction strainer | Filtration and contamination control during maintenance and repair. |
| 16 | Swing motor assembly or rotating group | Swing-drive hydraulic repair, subject to correct motor identification. |
| 17 | Swing reduction gearbox components | Related swing-drive service parts; confirm whether the requirement is hydraulic or mechanical. |
| 18 | Travel motor / final-drive hydraulic components | Travel-drive service requirements; match the motor and final-drive configuration. |
| 19 | Center joint / rotary manifold and seal components | For hydraulic passage and leakage-related servicing between upper and lower frames. |
| 20 | Hydraulic solenoid and proportional control valves | Electrical-hydraulic control requirements, identified by connector and part reference. |
Parts support for CAT 320D, 320D2, 336D and 345D
These excavator models differ in size, hydraulic configuration and production variants. Even when component names are similar, assemblies and internal parts may not be interchangeable. For example, Caterpillar’s 320D2 product information describes model-specific machine and hydraulic features; the 345D is a different large-excavator application. Use the machine PIN/serial number and current part number to confirm each requirement rather than relying on model name alone. CAT 320D2 information · CAT 345D information.
What to send for a fast parts quotation
- Machine model and complete serial number / PIN.
- Part number from the old component, nameplate or parts diagram.
- Clear photos of the component, markings, connectors and ports.
- Required quantity and whether you need a complete assembly or repair parts.
- Preferred condition or source, if applicable: genuine, aftermarket, used or refurbished.
- Delivery destination and required delivery timeline.
Availability, condition, warranty (if any), lead time and price are confirmed individually before an order is accepted. Do not treat the part categories in this article as confirmed stock or a compatibility guarantee.
Hydraulic maintenance and safety considerations
- Depressurize the hydraulic system using the machine maker’s procedure before loosening any hose, fitting, valve or cylinder connection.
- Never use hands to locate a hydraulic leak. High-pressure fluid can penetrate skin; use suitable tools and seek urgent medical attention for suspected injection injuries.
- Lower attachments safely, secure the machine, isolate energy sources and follow the service manual and site lockout procedures.
- Keep replacement parts, hoses and open ports clean. Contamination can damage pumps, valves and motors.
- Use the specified hydraulic fluid, filtration, torque values and pressure-testing procedures. Repairs and commissioning should be performed by qualified technicians.
Frequently asked questions
Do you supply hydraulic parts for CAT 320D, 320D2, 336D and 345D?
We accept enquiries for hydraulic system parts for these models. Supply is subject to the specific part requirement, serial-number verification and current availability.
Are the same hydraulic parts interchangeable across all four models?
No. Model name alone does not establish compatibility. Confirm the machine serial number, part number and component configuration before ordering.
Can I request used or refurbished components?
You may state your preferred condition when enquiring. Whether a genuine, aftermarket, used or refurbished option can be sourced depends on the exact item and current availability; condition and terms should be agreed before purchase.
What information should I provide to identify the right part?
Send the full machine serial number/PIN, component part number, photos or nameplate details, quantity and delivery location. These details help reduce wrong-part orders and delays.
How do I request price and availability?
Contact Raghu R Naik by phone or WhatsApp with the machine details and requested part. A quotation can be provided after the item and sourcing options are checked.
Request a CAT hydraulic parts quotation
Contact Raghu R Naik with the machine serial number, part number, quantity and delivery location.
Call or WhatsApp: +91-9745527006
Website: www.oreplus.in
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