Technical Constants & Performance Data
| Parameter | Value / Specification |
|---|---|
| Maximum System Pressure | Up to 5,075 PSI (350 bar) |
| Temperature Range | -40°F to 225°F (-40°C to 107°C) |
| Fluid Compatibility | Mineral-based hydraulic oils, Komatsu Super Hydraulic Fluid (KSHV), biodegradable fluids |
| Primary Seal Material | Polyurethane (AU) & Nitrile Rubber (NBR) |
| Seal Hardness (Dynamic) | 90-92 Shore A (Polyurethane) |
| Seal Hardness (Static) | 70 Shore A (NBR O-Rings) |
| Performance Standard | Manufactured to meet Komatsu DHTA (Dantotsu High-Tech Advance) quality and performance specifications. |
Exact Model Compatibility
| Komatsu Machine Models | Applicable Cylinder |
|---|---|
| Komatsu PC210LC-8 | Boom Cylinder |
| Komatsu PC220LC-8 | Boom Cylinder |
| Note: | This kit is a direct replacement for Komatsu OEM part number 707-52-10410. It is designed specifically for the boom cylinder on the listed machine models. Always verify the machine model, serial number, and cylinder identification (Boom) before installation. |
Component Specifications Table
| Component Name | Material | Color | Durometer | Function |
|---|---|---|---|---|
| Piston Seal (U-Cup) | Polyurethane (AU) | Brown | 92 Shore A | Main dynamic pressure seal on piston |
| Rod Seal (Step Seal) | Cast Polyurethane (CU) | Black | 90 Shore A | Primary rod seal for pressure retention |
| Wiper/Scraper (Double Lip) | Polyurethane (PU) | Black | 88 Shore A | Excludes contaminants, secondary wiping |
| Buffer Ring | Polyurethane (CU) | Black | 88 Shore A | Protects rod seal from pressure surges |
| O-Ring Set (Assorted) | Nitrile Rubber (NBR) | Black | 70 Shore A | Static seals for gland, ports, and plugs |
| Wear Ring / Guide Band | Glass-Filled PTFE | Brown | N/A | Guides piston, prevents metal-to-metal contact |
| Backup Rings | Nylon 6.6 | Tan/White | N/A | Prevents O-ring extrusion under high pressure |
Decompose pictures
Parts list
|
NO |
Number |
Name |
Qty |
|
707-00-0A031 |
CYLINDER ASS'Y |
2 |
|
|
1 |
707-11-75321 |
• CYLINDER |
1 |
|
2 |
114-63-55170 |
• BUSHING |
1 |
|
3 |
04065-06220 |
• RING,SNAP |
2 |
|
4 |
07020-00900 |
• FITTING,GREASE |
1 |
|
5 |
707-29-75831 |
• HEAD,CYLINDER |
1 |
|
6 |
707-52-10410 |
• BUSHING |
1 |
|
707-52-10710 |
|||
|
7 |
707-51-40210 |
• PACKING,ROD (KIT) |
1 |
|
8 |
198-63-75190 |
• SEAL,DUST (KIT) |
1 |
|
9 |
07179-12052 |
• RING,SNAP |
1 |
|
10 |
07000-12070 |
• O-RING (KIT) |
1 |
|
11 |
707-35-52760 |
• RING,BACK-UP (KIT) |
1 |
|
12 |
07000-12075 |
• O-RING (KIT) |
1 |
|
13 |
721-58-40930 |
• ROD,PISTON |
1 |
|
14 |
114-63-55170 |
• BUSHING |
1 |
|
15 |
04065-06220 |
• RING,SNAP |
2 |
|
16 |
07020-00900 |
• FITTING,GREASE |
1 |
|
17 |
707-36-75370 |
• PISTON |
1 |
|
18 |
707-44-75180 |
• RING,PISTON (KIT) |
1 |
|
19 |
707-39-75190 |
• RING,WEAR (KIT) |
1 |
|
20 |
707-67-30030 |
• NUT |
1 |
|
21 |
02896-11009 |
• O-RING (KIT) |
2 |
|
707-98-22850 |
SERVICE KIT |
2 |
Installation decomposition diagram
Safe Depressurization & Support: Park the excavator on level ground. Fully lower the boom and bucket to the ground to relieve all hydraulic pressure. Mechanically secure the boom or cylinder rod to prevent any movement.
Clean Workspace: Perform disassembly and assembly in a meticulously clean, dust-controlled environment. Use a parts washer and lint-free cloths.
Documented Disassembly: Carefully disassemble the cylinder gland. Photograph and label each component and its orientation during removal.
Mandatory Metal Inspection: Thoroughly inspect the cylinder rod for scratches, pitting, or scoring. Inspect the cylinder bore (ID) for wear, tapering, or damage. Replace any damaged metal components before installing new seals.
Proper Seal Installation: Lubricate all new elastomeric seals with clean hydraulic fluid. Use dedicated seal installation tools (cone tools, sleeves) to guide seals over threads and sharp edges without cutting or rolling.
Precision Reassembly: Follow the included diagram for correct seal order and orientation. Ensure all seals are fully and squarely seated in their grooves.
Torque Specifications: Use a calibrated torque wrench. Adhere strictly to Komatsu's specified torque values and sequences for gland bolts, tie-rods, or end caps.
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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