English 
Parts list
|
№ |
Number |
Name |
Qty |
|
1 |
395012014 |
JACK |
1 |
|
2 |
390658013 |
BUSHING |
1 |
|
3 |
395077012 |
CYLINDER |
1 |
|
4 |
801920220 |
NUT |
1 |
|
5 |
3F4588604 |
PISTON |
1 |
|
6 |
395183013 |
ROD |
1 |
|
7 |
391964011 |
CYLINDER HEAD |
1 |
|
|
500217005 |
BUSHING |
1 |
|
8 |
878000486 |
GASKET KIT |
1 |
|
9 |
855661048 |
SCRAPER RING |
1 |
|
10 |
855021237 |
O-RING |
1 |
|
11 |
855661052 |
GASKET |
1 |
|
12 |
855661050 |
SEAL |
1 |
|
13 |
855080619 |
RING |
1 |
|
14 |
855021619 |
O-RING |
1 |
|
15 |
855661205 |
O-RING |
1 |
|
16 |
855661204 |
GASKET |
1 |
Our advantage: original system data to ensure accurate size
Product Description
Heavy-Duty 878000486 Boom Cylinder Service Repair Kit for Komatsu WB150-2 Backhoe Loaders
Restore maximum lifting breakout force and eliminate dangerous boom sagging in your digging operations with Toparts' premium 878000486 hydraulic cylinder seal kit. Specifically precision-engineered for the heavy-duty main boom lift cylinders utilized on Komatsu WB150-2 backhoe loaders, this overhaul service kit is built to survive extreme pressure shockwaves, continuous structural fatigue, and harsh site debris.
The Toparts Engineering Difference: Built for Heavy Backhoe Lift Stress
Backhoe loader boom cylinders endure severe dynamic shock loads whenever the bucket strikes hard ground, quarry stone, or thick asphalt. Standard aftermarket seals often suffer from seal lip deformation or pressure extrusion under these continuous shockwaves, resulting in hydraulic fluid bypass and loss of holding power. At Toparts, we manufacture our Komatsu-compatible kits with explicit material upgrades:
Mining-Grade P6000 Polyurethane Matrix: Our primary dynamic rod and piston seals are molded from advanced P6000 PU, offering 40% higher tensile strength and superior extrusion resistance under intense hydraulic pressure spikes compared to standard TPU.
Aggressive Environmental Mud Scraper: Equipped with a heavy-duty double-lip dust wiper system that actively shears off abrasive sand, clay crusts, and moisture films from the extending rod, protecting the internal sealing lips and cylinder barrel from scoring.
Zero-Drift Heavy Pressure Containment: Precision-machined PTFE step seals paired with premium NBR energy rings absorb shock loads during heavy excavation, maintaining tight holding force and eliminating boom drift.
High Elastic Memory Static Seals: All static O-rings and backup rings are formulated to resist compression set and continuous high oil temperatures up to 120°C, ensuring tight static sealing across the cylinder head connection.
Technical Specifications:
Brand Compatibility: Komatsu
Equipment Application: Backhoe Loaders (WB Series)
Target Machine Match: Komatsu WB150-2 / WB150-2N
Seal Kit Part Number (P/N): 878000486
Application Component: Main Hydraulic Boom Lift Cylinder
Material Matrix: High-Performance P6000 PU, Reinforced PTFE + Bronze, Premium NBR
Condition: 100% Brand New Industrial-Grade Aftermarket
Tag:Komatsu 878000487 LEFT Cylinder Service seal kit,Komatsu 878000492 Bucket Cylinder Service seal kit,Komatsu 878000490 Arm Cylinder Service seal kit
