Boom drift or weakened lift force on your 349D or 349D2? A worn 225-4523 boom cylinder allows piston bypass to accumulate until the 349D can no longer hold maximum lift load without the boom slowly drifting down. RITO supplies this heavy-duty replacement boom cylinder to restore full 349-series lift capacity and boom holding performance.
Item NO.:
225-4523Order(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In Stock225-4523 Hydraulic Boom Cylinder Assembly for Caterpillar 349D, 349DL, 349D2 and 349D2L excavators. Large-format boom cylinder sized for the 49-tonne Cat 349D work cycle. OEM-specification chrome rod, precision-honed bore and a multi-layer piston seal assembly restore the holding force and cycle time performance of a new cylinder from installation.
| Part Number | 225-4523 |
|---|---|
| Part Name | Hydraulic Boom Cylinder Assembly |
| Compatible Brand | Caterpillar |
| Applicable Models | 349D, 349DL, 349D2, 349D2L Excavator |
| Application | Main boom lift hydraulic cylinder for Caterpillar 349D and 349D2 large 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 boom lifting force for Cat 349D-series 49-tonne class excavator work cycles |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
Cylinder bore diameter and wall thickness rated for 349D maximum boom pressure, maintaining structural integrity under the high piston loads of 49-tonne excavator heavy-lift cycles.
Chrome layer thickness and surface finish match 349D OEM spec, providing the hardness and lubricity that allow the rod seal to achieve full service life without premature wear.
Layered piston seal assembly including buffer seal protects the primary piston seal from pressure spikes during rock-breaking and maximum-load lift operations.
225-4523 covers 349D, 349DL, 349D2 and 349D2L for direct replacement across the Cat 349D production range.
FAQ
Q: How do I distinguish internal bypass from rod seal failure on the 225-4523 boom cylinder?
A: No visible external leakage with slow boom drift under static load confirms internal bypass. Rod seal leakage shows as oil weeping from the cylinder rod at the seal housing. Both require repair; internal bypass requires full cylinder replacement or piston seal rebuild.
Q: Can I rebuild the 225-4523 boom cylinder with a seal kit on a 349D?
A: If the chrome rod and bore are within OEM dimensional specification, a seal kit rebuild is cost-effective. Replace the full cylinder if the rod shows pitting, deep scratches or chrome delamination that would immediately cut the new seal.
Q: What is the safe working procedure for replacing the 225-4523 boom cylinder on a 349D?
A: Support the boom on rated-capacity stands or a hydraulic support before disconnecting the cylinder. Bleed boom circuit pressure to zero before disconnecting hydraulic lines. Follow the Caterpillar 349D SSBU procedure for boom cylinder removal.
Q: How to confirm 225-4523 is the correct boom cylinder for my 349D?
A: Match part number 225-4523 and confirm machine model is 349D, 349DL, 349D2 or 349D2L. Provide machine serial number for cross-reference.
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
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