Compatibility & Application Data
| Application Type | Likely Equipment Examples | Purpose |
|---|---|---|
| Compact Equipment Cylinders | Komatsu mini excavators, compact track loaders, skid steers | Rebuilding lift, tilt, or auxiliary cylinders on smaller machines. |
| Auxiliary/Function Cylinders | Grapple cylinders, thumb cylinders, tilt cylinder on attachments | Repairing cylinders on attachments or auxiliary circuits. |
| General Industrial Hydraulics | Presses, machine tools, material handling equipment | Servicing small-bore industrial cylinders with compatible dimensions. |
| Note: | The primary identifier for this kit is the 30mm x 50mm cylinder size. Machine model is secondary; always measure the cylinder. |
Technical Constants & Performance Data
| Parameter | Value / Specification |
|---|---|
| Target Cylinder Size | 30mm Rod Diameter x 50mm Cylinder Bore |
| Maximum Pressure Rating | Up to 3,625 PSI (250 bar) |
| Temperature Range | -40°F to 225°F (-40°C to 107°C) |
| Fluid Compatibility | Petroleum-based hydraulic oils, standard AW/HLP fluids, water-glycol |
| Primary Seal Material | Polyurethane (AU) & Nitrile Rubber (NBR) |
| Seal Hardness (Dynamic) | 88-92 Shore A (Polyurethane) |
| Seal Hardness (Static) | 70 Shore A (NBR O-Rings) |
| Design Standard | Engineered to meet Komatsu's original performance and dimensional specifications. |
Exact Model Compatibility
| Komatsu Part Number | Target Cylinder Dimension |
|---|---|
| 707-98-04590 | Cylinders with 30mm Rod x 50mm Bore |
| Note: | This kit is a direct replacement for Komatsu OEM part number 707-98-04590. It is designed for cylinders with these specific dimensions. Compatibility is determined by the cylinder's physical bore and rod size, NOT by machine model alone. Always verify your cylinder's dimensions before ordering. |
Component Specifications Table
| Component Name | Material | Color | Durometer | Nominal Size (For Reference) |
|---|---|---|---|---|
| Piston Seal (U-Cup) | Polyurethane (AU) | Brown | 90 Shore A | For 50mm Bore |
| Rod Seal (Step Seal) | Cast Polyurethane (CU) | Black | 90 Shore A | For 30mm Rod |
| Wiper/Scraper | Polyurethane (PU) | Black | 85 Shore A | For 30mm Rod |
| O-Ring Set | Nitrile Rubber (NBR) | Black | 70 Shore A | Assorted sizes for gland & ports |
| Wear Ring / Guide Band | Filled PTFE / Nylon | Brown/White | N/A | For 50mm Bore / 30mm Rod (as applicable) |
| Backup Rings | Nylon | Tan | N/A | For specific O-Rings |
Support Seals & Hardware
Full set of static O-rings for gland assembly, end cap, and hydraulic port connections.
High-performance wear ring/guide band to centralize the piston and absorb side loads.
Necessary backup rings for high-pressure static seals.
Excluded Items: This is a seal and wear component kit only. It does NOT include the piston, cylinder rod, barrel, gland nut, bearings, bolts, pins, or any other metal parts or hardware.
Parts list
|
NO |
Number |
Name |
Qty |
|
K01 |
11Y-32-05000 |
Shoe Bolt and Nut Kit |
|
|
112-32-11211 |
• Bolt |
50 |
|
|
11Y-32-11220 |
• Nut |
50 |
|
|
K02 |
11Y-32-05010 |
Shoe Bolt and Nut Kit |
|
|
11G-32-21212 |
• Bolt |
50 |
|
|
11Y-32-11220 |
• Nut |
50 |
|
|
K03 |
707-99-14960 |
Service Kit, Lift Cylinder |
|
|
02896-11009 |
• O-ring |
2 |
|
|
07000-12070 |
• O-ring |
1 |
|
|
07000-12075 |
• O-ring |
1 |
|
|
07000-12085 |
• O-ring |
1 |
|
|
07145-00045 |
• Seal, Dust |
4 |
|
|
707-35-52760 |
• Ring, Back-up |
1 |
|
|
707-39-75190 |
• Ring, Wear |
1 |
|
|
707-44-75180 |
• Ring, Piston |
1 |
|
|
707-51-40030 |
• Packing, Rod |
1 |
|
|
707-51-40640 |
• Ring, Buffer |
1 |
|
|
707-56-40580 |
• Seal, Dust |
1 |
|
|
K04 |
707-99-14970 |
Seal Kit, Hydraulic Cylinder |
|
|
02896-11009 |
• O-ring |
3 |
|
|
07000-12075 |
• O-ring |
1 |
|
|
07000-B2070 |
• O-ring |
1 |
|
|
07002-11423 |
• O-ring |
1 |
|
|
707-35-52760 |
• Ring, Back-up |
1 |
|
|
707-39-75030 |
• Ring, Wear |
1 |
|
|
707-44-75150 |
• Ring, Piston |
1 |
|
|
707-51-40030 |
• Packing, Rod |
1 |
|
|
707-51-40650 |
• Ring, Buffer |
1 |
|
|
707-56-40740 |
• Seal, Dust |
1 |
|
|
K05 |
707-99-24650 |
Service Kit, Tilt Cylinder |
|
|
02896-11008 |
• O-ring |
2 |
|
|
04065-07225 |
• Ring, Snap |
2 |
|
|
07000-12085 |
• O-ring |
1 |
|
|
07000-12090 |
• O-ring |
1 |
|
|
07146-02086 |
• Ring, Back-up |
1 |
|
|
07156-00912 |
• Ring, Wear |
1 |
|
|
707-44-90180 |
• Ring, Piston |
1 |
|
|
707-46-03020 |
• Bushing |
1 |
|
|
707-51-45030 |
• Packing, Rod |
1 |
|
|
707-51-45640 |
• Ring, Buffer |
1 |
|
|
707-56-45580 |
• Seal, Dust |
1 |
|
|
K06 |
707-99-14980 |
Seal Kit, Hydraulic Cylinder |
|
|
02896-11009 |
• O-ring |
2 |
|
|
07000-12075 |
• O-ring |
1 |
|
|
07000-B2070 |
• O-ring |
2 |
|
|
07145-00045 |
• Seal, Dust |
4 |
|
|
707-35-52760 |
• Ring, Back-up |
1 |
|
|
707-39-75190 |
• Ring, Wear |
1 |
|
|
707-44-75150 |
• Ring, Piston |
1 |
|
|
707-51-40030 |
• Packing, Rod |
1 |
|
|
707-51-40650 |
• Ring, Buffer |
1 |
|
|
707-56-40740 |
• Seal, Dust |
1 |
|
|
K07 |
707-99-23040 |
Service Kit, Angle Cylinder |
|
|
02896-11009 |
• O-ring |
2 |
|
|
07000-12075 |
• O-ring |
1 |
|
|
07000-12080 |
• O-ring |
1 |
|
|
07146-02076 |
• Ring, Back-up |
1 |
|
|
07156-00810 |
• Ring, Wear |
2 |
|
|
707-44-80180 |
• Ring, Piston |
1 |
|
|
707-51-40030 |
• Packing, Rod |
1 |
|
|
707-51-40640 |
• Ring, Buffer |
1 |
|
|
707-56-40580 |
• Seal, Dust |
1 |
|
|
K08 |
707-98-04590 |
Seal Kit, Hydraulic Cylinder |
|
|
02896-11009 |
• O-ring |
2 |
|
|
07000-13045 |
• O-ring |
1 |
|
|
07000-13048 |
• O-ring |
1 |
|
|
07002-11423 |
• O-ring |
1 |
|
|
07145-00030 |
• Seal, Dust |
4 |
|
|
10E-63-32390 |
• Ring, Wear |
1 |
|
|
707-35-52510 |
• Ring, Back-up |
1 |
|
|
707-44-50180 |
• Ring, Piston |
1 |
|
|
707-51-30210 |
• Packing, Rod |
1 |
|
|
707-56-30740 |
• Seal, Dust |
1 |
Installation decomposition diagram
Dimension Verification: Before disassembly, confirm the cylinder's rod and bore dimensions match this kit (30mm rod, 50mm bore).
Safe Depressurization: Relieve all hydraulic system pressure before disconnecting any lines or disassembling the cylinder.
Clean Workspace: Perform all work in a clean environment to prevent contamination.
Disassembly & Inspection: Carefully disassemble the cylinder. Inspect all metal components (rod, bore, piston) for scoring, pitting, or excessive wear. Replace damaged parts.
Seal Installation: Lubricate all new seals with clean hydraulic fluid. Use appropriate tools to install seals without cutting or rolling them.
Reassembly: Follow the original seal arrangement or the provided diagram. Ensure all components are seated properly.
Torque Specifications: Use a torque wrench to tighten all fasteners to the manufacturer's specifications.
Frequently Asked Questions
A. When will get the items after I place order?
Q. Once your payment is confirmed,we will arrange the goods within 1~4 days; if not in stock, we will inform you before placing the order?
A. If I only know the excavator model, but can not offer parts No.,what should I do ?
Q. If possible, you can send us pictures of old products, nameplate or the size for reference.
A. How can you guarantee the quality??
Q. We will 100% test the goods before delivery. We also support video inspection.
A. How long will it take to delivery to my address??
Q. The normal delivery time is 3-7 days, depending on which country you are in.?
A : Which delivery method will you choose?
Q : By sea, air or express(DHL,Fedex,TNT, UPS, EMS etc.)，Sometimes we will arrange as the customer's demand.
A: What's package? Can you give me the package according my requirement??
Q. We usually packed by standard exported box or carton. And yes we can pack as per your requirement.
A: Can the price be cheaper?
Q: Of course, you will be offered a good discount for a big amount.
A: Why should I choose to buy from you?
Q:Our advantages: 100% quality assurance, develop and manufature follow original ones;Quick response within 24 hours; Small order allowed;Reasonable stock and timely delivery;Neutral packing, customized packing are allowed. Positive customer feedback from abroad market;Excellent after-sales service.
A : Which payment terms can you accept?
Q : Paypal. Western Union, Bank Transfer, T/T...
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