Arm crowd slow or rod seal weeping on your 312C? A worn 170-9833 arm cylinder loses piston seal integrity and drops arm crowing force below what the machine needs for hard digging, while a scored rod seal leaks hydraulic oil across the cylinder head. RITO supplies this heavy-duty replacement arm cylinder to restore full 312-series arm crowd force and clean, seal-tight operation.
Item NO.:
170-9833170-9833 Hydraulic Arm Cylinder Assembly for Caterpillar 312C, 315C, 318C excavators. Heavy-duty double-acting stick cylinder with chrome-plated precision rod and a honed bore produced to OEM specification. Piston seal integrity and rod chrome finish are matched to the 312-class crowd duty cycle so the new cylinder restores original arm penetrating force from installation.
| Part Number | 170-9833 |
|---|---|
| Part Name | Hydraulic Arm Cylinder Assembly |
| Compatible Brand | Caterpillar |
| Applicable Models | 312C, 315C, 318C Excavator |
| Application | Arm / stick crowd hydraulic cylinder for Caterpillar 312-class excavators |
| Material | High-strength steel body, chrome-plated precision rod |
| Product Color | Yellow or industrial finish |
| Working Temperature | -25°C~+80°C |
| Key Function | Provides hydraulic arm crowd and extension force for 312-series excavator work cycles |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
Rod chrome layer thickness and adhesion matched to 312-series OEM specification, providing the hardness and corrosion resistance that determine arm cylinder seal service life.
Bore honed to OEM surface finish and tolerance for correct piston seal contact and low internal bypass at full 312 crowd pressure.
170-9833 covers the arm cylinder specification across the listed Caterpillar 312-class models, keeping fleets on one interchangeable replacement.
Rod and piston seal assembly rated for 312 maximum stick pressure, with buffer seals that protect the primary rod seal from pressure spikes during heavy digging.
FAQ
Q: How do I tell if the 170-9833 arm cylinder has internal bypass or rod seal leakage?
A: External leakage shows at the rod seal. Internal bypass makes the arm crowd slowly under load without visible external oil. Stall the arm against a load and watch for slow drift over 60 seconds.
Q: Can I replace only the seal kit in the 170-9833 cylinder?
A: If the rod chrome is undamaged and the bore is within specification, a seal kit repair is economical. Replace the full cylinder if the rod shows pitting, score marks or chrome delamination that would cut the new seals immediately.
Q: What bleeding procedure is needed after fitting 170-9833?
A: Cycle the arm slowly through full extension and retraction five times at low engine speed before applying full load. This purges air and seats the seal assembly before high-pressure operation.
Q: How to confirm 170-9833 is correct for my 312?
A: Match the existing cylinder part number against 170-9833 and confirm the machine model is one of: 312C, 315C, 318C. Provide the machine serial number for cross-reference confirmation.
Q: What quality options are available?
A: We provide original, OEM and high-quality aftermarket versions with stable supply capability.
Q:Why Choose RITO?
A:Listed Factory
Stable&Reliable Quality
OEM Factory for Chinese Top Excavator Brands
Supplier to Fortune 500 Companies
RITO Excavator Stick Cylinder is built for ZX120, ZX200, ZX210, EX200-1, and 320CLZBYG. For distributors and agents: high interchangeability reduces inventory complexity. Mining customers benefit from reinforced sealing and shock resistance, lowering downtime and maintenance costs.
View More
This RITO 527-0741 527-0742 Hydraulic Pump Coupling Hub is a key transmission component for Caterpillar CAT 336GC and 336D excavators, designed to connect the engine and hydraulic pump with stable torque transfer. Featuring a 15-tooth flange structure, it ensures precise alignment, smooth power delivery, and reliable operation in demanding construction environments.
View More
This RITO 124-1607-OT Hydraulic Oil Cooler is a key cooling component for Caterpillar CAT 320C, 320D, 325D, and 330D excavators, designed to effectively dissipate heat from hydraulic oil and maintain optimal system temperature. It ensures stable oil viscosity, protects internal components, and supports reliable operation in demanding construction environments.
View More
This RITO 234-4440 Swivel Joint (Rotary Union) is a critical hydraulic component for Caterpillar CAT 336D, 325D, and 330D excavators, designed to transfer hydraulic oil between the upper structure and undercarriage during continuous rotation. It ensures stable oil flow to travel motors, maintaining smooth operation and reliable performance in construction environments.
View More
Hydraulic lag and erratic pressure in CAT excavators often signal a failing proportional valve, causing costly site delays. The 585-9230 eliminates these inefficiencies. Precision-engineered for mining and heavy construction, it prevents system overheating and jerky boom movements.
View More
Hydraulic lag and erratic pressure in CAT excavators often signal a failing proportional valve, causing costly site delays. The 585-9230 eliminates these inefficiencies. Precision-engineered for mining and heavy construction, it prevents system overheating and jerky boom movements.
View More
The RITO Excavator Coil Spring 179-6916-Y is designed for heavy-duty applications in CAT excavators, offering reliable and long-lasting performance in demanding work environments. This high-quality spring ensures consistent and efficient load-bearing capability, reducing wear and tear on critical excavator components. The 179-6916-Y is essential for maintaining optimal machine performance in industries such as construction and mining. By minimizing downtime and maintenance costs, this coil spring enhances productivity and contributes to the long-term durability of your fleet. Designed for seamless compatibility with various CAT excavator models, it provides an ideal replacement solution for wholesale distributors and agents.
View More
Unstable fan speeds and hydraulic overheating often stem from inefficient pump pressure. In grueling mining sites, a failing fan pump leads to engine derating and massive downtime. The 291-0061 solves these thermal inconsistencies, preventing the costly "cascading failures" that plague heavy excavator fleets.
View MoreLeave A Message
Scan to wechat :
