English 
Parts list
|
NO. |
Part Number |
Name |
Qty |
|
1 |
395011006 |
JACK ASSY, R.H |
1 |
|
1 |
395011007 |
JACK ASSY, R.H |
1 |
|
2 |
395184013 |
ROD |
1 |
|
3 |
500460755 |
HEAD |
1 |
|
4 |
395276011 |
PISTON |
1 |
|
5 |
801470086 |
GRUB SCREW |
1 |
|
6 |
391709001 |
PIN |
1 |
|
7 |
805750022 |
BALL |
11 |
|
8 |
395075013 |
CYLINDER |
1 |
|
8 |
395077013 |
CYLINDER |
1 |
|
9 |
500217006 |
BUSHING |
1 |
|
10 |
500044300 |
SPACER |
1 |
|
11 |
500217005 |
BUSHING |
2 |
|
|
878000494 |
GASKET KIT |
1 |
|
12 |
|
GASKET |
1 |
|
13 |
|
GASKET |
1 |
|
14 |
|
GASKET |
1 |
|
15 |
|
GASKET |
1 |
|
16 |
|
RING |
1 |
|
17 |
|
O-RING |
1 |
|
18 |
|
O-RING |
1 |
|
19 |
|
GASKET |
1 |
|
20 |
|
RING |
1 |
Our advantage: original system data to ensure accurate size
Product Description
Heavy-Duty 878000494 Outrigger Hydraulic Cylinder Seal Kit for Komatsu WB140-2 Backhoe Loaders
Maintain rigid machine leveling and eliminate hazardous outrigger drift during heavy excavation with Toparts' premium 878000494 hydraulic cylinder service repair kit. Specifically precision-engineered for the heavy-duty vertical outrigger (stabilizer) hydraulic cylinders fitted on Komatsu WB140-2 backhoe loaders, this overhaul service kit is built to survive extreme pressure surges, sudden machine tilt, and continuous exposure to harsh mud crusts.
The Toparts Engineering Difference: Built for Brutal Outrigger Stress
Backhoe loader outrigger cylinders operate under severe physical torture. When the backhoe bucket strikes hard ground or trench rock, the outrigger cylinders support the entire rear frame weight, subjecting the seals to intense static pressure and severe lateral bending forces (side-loading). Furthermore, they function directly in the dirt line. Standard aftermarket seals quickly suffer from seal lip deformation, seal roll, or pressure extrusion, causing hydraulic fluid bypass and dangerous machine slipping. 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 loads compared to standard TPU.
Aggressive Environmental Mud Scraper: Features a rugged double-lip dust wiper system that actively shears off dry mud crusts, silica sand, and moisture films from the extending rod, protecting internal sealing lips and cylinder walls from scoring.
Zero-Drift Heavy Pressure Containment: Precision-machined PTFE step seals backed by premium NBR energizers absorb continuous pressure spikes during heavy digging, maintaining tight holding force and eliminating outrigger drift.
High Elastic Memory Static Seals: All static O-rings and backup rings are formulated to resist compression set under continuous high oil temperatures up to 120°C, ensuring leak-free performance across the cylinder gland interface.
Technical Specifications:
Brand Compatibility: Komatsu
Equipment Application: Backhoe Loaders (WB Series Utility)
Target Machine Match: Komatsu WB140-2 / WB140-2N
Seal Kit Part Number (P/N): 878000494
Application Component: Outrigger / Vertical Stabilizer Leveling Hydraulic 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
