Rising oil temperature, metal particles in the travel housing oil or a machine that creeps and then stops are classic symptoms of a tired SY285 SY335 Travel Drive. Once the bearing preload is lost the gear mesh runs out of alignment and wear accelerates quickly. RITO supplies this SY285 SY335 Travel Drive as a complete unit for standard excavators, returning tractive effort and travel speed to specification.
Item NO.:
SY285 SY335Order(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In StockAs a complete SY285 SY335 Travel Drive, this assembly covers everything behind the hydraulic motor: ring gear, planet gears, carriers, bearings, seals and output shaft. Using one matched assembly avoids the mismatch that comes from mixing new gears with worn carriers, which is the usual reason a rebuilt unit fails again within a few hundred hours. It fits the standard mounting of standard excavators and is supplied ready to install.
| Part Number | SY285 SY335 |
| Part Name | Travel Drive |
| Compatible Brand | Sany |
| Applicable Models | SY285 SY335 |
| Application | Excavator travel drive assembly for the undercarriage |
| Material | Cast iron housing with hardened alloy steel gear set |
| Product Color | Industrial grey / OEM color |
| Working Temperature | -25°C~+80°C |
| Key Function | Converts hydraulic flow into tractive effort |
| Condition | 100% New |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
 | Bolt-On Fitment Mounting pattern, output spline and overall envelope follow the original unit, so the assembly installs with the existing bolts, hoses and guards. |
 | Hardened Internals Gears and shafts are case hardened and ground, giving a tooth surface that resists pitting under the shock loads typical of excavator travel and swing duty. |
 | Rigid Cast Housing The ring gear and bearing bores sit in one casting, holding bore alignment under load so the gear mesh does not walk out of position. |
 | Tested Before Packing Each unit is checked for backlash, turning torque and seal integrity, then packed in a reinforced case to survive international freight. |
Q: Do I need to adjust backlash after fitting?
A: No. Backlash and bearing preload are set at assembly. Fit the unit, fill with the specified oil grade, and check for leaks after the first few hours of operation.
Q: Is this a complete assembly or just the gear set?
A: It is supplied as a complete reduction assembly - housing, ring gear, planet gears, carriers, bearings, seals and output shaft - so nothing has to be transferred from the old unit.
Q: How do I confirm this SY285 SY335 unit fits my machine?
A: Compare the mounting bolt pattern, the output spline and the overall height against the unit on your machine, and check the model plate. If the numbers differ, send us a photo of the plate and we will confirm the correct variant.
Q: What usually causes these reduction units to fail?
A: Contaminated oil and lost bearing preload. Once dust enters through a worn seal, the bearings loosen, the gear mesh misaligns and the unit starts to whine and overheat within a few hundred hours.
Q: Which oil should I use after installation?
A: Use the grade listed in the machine service manual for the final drive or swing reduction. Overfilling causes heat; underfilling causes immediate bearing damage, so fill to the level plug.
Q: Can this unit be used as an upgrade on an older machine?
A: Where the mounting pattern and spline match, the later specification can be fitted to earlier machines. Confirm the interface dimensions with us before ordering.
Q: Why Choose RITO?
A: Listed Factory
Stable&Reliable Quality
OEM Factory for Chinese Top Excavator Brands
Supplier to Fortune 500 Companies
Bucket crowd force weak or cylinder rod leaking on your SY485C? A worn 60248642 bucket cylinder allows internal piston bypass to cut crowd force below what the machine needs for hard material penetration, while rod seal wear causes external leakage that contaminates the work area. RITO supplies this heavy-duty replacement bucket cylinder to restore full SY485-series bucket crowd force and clean seal operation.
View More
Boom lift force dropping or hydraulic oil weeping from the rod on your SY485C? A worn 13304040 boom cylinder lets internal piston bypass bleed away lift force until the machine can no longer hold a loaded boom, while a scored rod seal leaks oil across the cylinder head. RITO supplies this heavy-duty replacement boom cylinder to restore full SY485-series boom lift and clean, seal-tight operation.
View More
Arm crowd slow or rod seal weeping on your SY485C? A worn 60248643 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 SY485-series arm crowd force and clean, seal-tight operation.
View More
Arm crowd slow or rod seal weeping on your SY335C? A worn 60011436 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 SY305-series arm crowd force and clean, seal-tight operation.
View More
Bucket crowd force weak or cylinder rod leaking on your SY335C? A worn 60011434 bucket cylinder allows internal piston bypass to cut crowd force below what the machine needs for hard material penetration, while rod seal wear causes external leakage that contaminates the work area. RITO supplies this heavy-duty replacement bucket cylinder to restore full SY305-series bucket crowd force and clean seal operation.
View More
Boom lift force dropping or hydraulic oil weeping from the rod on your SY335C? A worn 60011435 boom cylinder lets internal piston bypass bleed away lift force until the machine can no longer hold a loaded boom, while a scored rod seal leaks oil across the cylinder head. RITO supplies this heavy-duty replacement boom cylinder to restore full SY305-series boom lift and clean, seal-tight operation.
View More
Bucket crowd force weak or cylinder rod leaking on your SY235C? A worn 60027481 bucket cylinder allows internal piston bypass to cut crowd force below what the machine needs for hard material penetration, while rod seal wear causes external leakage that contaminates the work area. RITO supplies this heavy-duty replacement bucket cylinder to restore full SY235C-series bucket crowd force and clean seal operation.
View More
Bucket crowd force weak or cylinder rod leaking on your SY215C? A worn 11350784 bucket cylinder allows internal piston bypass to cut crowd force below what the machine needs for hard material penetration, while rod seal wear causes external leakage that contaminates the work area. RITO supplies this heavy-duty replacement bucket cylinder to restore full SY215C-series bucket crowd force and clean seal operation.
View MoreLeave A Message
Scan to wechat :
