ranroswang@hksparkling.com 
+86 138 2341 8469
707-99-72090 Bucket Cylinder Seal Kit for Komatsu PC1250-7, PC1250-8
The 707-99-72090 Seal Kit is a high-performance hydraulic repair assembly designed specifically for the Komatsu PC1250 series, one of the most widely used large-scale mining and heavy construction excavators.
This kit is primarily utilized for the bucket cylinder, which handles the highest force concentrations during excavation. Given the massive breakout force of the PC1250, these seals are engineered to withstand extreme pressure spikes and abrasive contaminants.
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Why Choose the SPARKLING 707-99-72090 Seal Kit?
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- Pressure Spike Resistance: Specifically formulated to handle the intense hydraulic surges encountered when the bucket hits solid rock or frozen ground.
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- Enhanced Dust Protection: Includes a heavy-duty wiper seal designed to prevent the fine rock dust and grit typical of mining sites from entering the cylinder gland.
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- Low-Friction Design: Reduces heat buildup during high-frequency loading cycles, extending the lifespan of both the seals and the hydraulic fluid.
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- Complete Overhaul Kit: Includes all necessary rod seals, piston seals, buffer rings, and O-rings required for a professional-grade cylinder rebuild.
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Compatible Komatsu Excavator Models
This seal kit is the standard for the following PC1250 platforms:
| Machine Model | Generation | Application |
| PC1250-7 | Dash-7 | Large Scale Earthmoving / Quarry |
| PC1250-8 | Dash-8 | Mining / Mass Excavation |
| PC1250-8R | Dash-8 (Updated) | Mining / Heavy Construction |
| PC1250SP-8 | Super Pass (SP) | High-Production Backhoe Loading |
| Exact Machine Model | Cylinder Application | Corresponding OEM Cylinder P/N | Compatible Serial Number (S/N) Range |
|---|---|---|---|
| PC1250-8 / PC1250LC-8 | Bucket Cylinder — Left Hand (LH) | 707-01-0J752 | S/N 30247 and up |
| PC1250-8 / PC1250LC-8 | Bucket Cylinder — Right Hand (RH) | 707-01-0J762 | S/N 30247 and up |
| PC1250SP-8 (Short Boom Version) | Bucket Cylinder — Left Hand (LH) | 707-01-0J772 | S/N 30247 and up |
| PC1250SP-8 (Short Boom Version) | Bucket Cylinder — Right Hand (RH) | 707-01-0J782 | S/N 30247 and up |
Q&A Section
Q1: How can I tell if my PC1250 bucket cylinder needs the 707-99-72090 kit?
A: Common signs include "bucket drift" (the bucket slowly opening or closing when the controls are neutral), visible oil on the cylinder rod, or a noticeable loss of digging power.
Q2: Is this kit compatible with the PC1250LC (Long Crawler) versions?
A: Yes. The hydraulic cylinders for the standard and LC versions of the PC1250 series are generally identical, provided they are within the same generation (e.g., Dash-7 or Dash-8).
Q3: Does this kit include the wear rings?
A: Most 707-99-72090 kits contain the primary sealing elements (Rod, Piston, Wiper, Buffer). However, for large machines like the PC1250, wear rings (guide rings) are often sold separately or as an "Extended Kit." Always check the component list before ordering.
About SPARKLING MACHINERY:
- Founded in 2013, SPARKLING focuses on high-quality excavator parts across hydraulics, undercarriage, engines and electrical systems. We prioritize stability, precision and continuous service, offering worldwide distribution, tailored solutions and strict QC to help customers reduce cost and increase uptime.
Get In Touch:
- Replace your failing ECU confidently. Contact SPARKLING for pricing, lead time, and technical support — restore optimal machine control quickly and reliably.
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📦 Packing
1. Packaging methods: Carton box + Wooden case/Pallet + Anti-rust treatment
2. Export-standard packaging to ensure safety during transportation
3. Custom packaging available upon request
4. Dimensions and weight can be provided for freight calculation
🚚 Shipping
1. Available shipping methods: Sea freight, Air freight, Express delivery (DHL, UPS, FedEx, etc.)
2. LCL (Less than Container Load) and FCL (Full Container Load) options are supported
3. For Russian clients, we can introduce the forwarder agent to you
4. Delivery time: Ships within 1-3 working days after payment (for items in stock)
💳 Payment
1. Accepted methods: T/T, Bank Transfer, PayPal, Alipay, WeChat Pay, Western Union
2. Deposit + balance payment available for large or custom orders
3. Flexible payment options—feel free to contact us for details
📌 Frequently Asked Questions (FAQs)
Q: Which excavator models is this part compatible with?
A: This product is compatible with major brands such as CAT, KOMATSU, HITACHI, and more. Custom specifications are also available.
Q: How can I make sure I’m selecting the correct part?
A: You can send us a photo of the old part, part number, or your excavator model, and we will help you confirm the right match.
Q: Is there a warranty for this product?
A: Yes, we offer a 6-month quality guarantee under normal use.
Get a free quote
We are committed to producing the highest quality products at the most competitive prices. Therefore, we sincerely invite all interested companies to contact us for more information.
Contact us
Email: ranroswang@hksparkling.com
Wechat: +86 136 0901 0879
Skype: foreverlucia1
WhatsApp: +86 136 0901 0879
Address: No. 514-515, Hulin Road, Tianhe District, Guangzhou, China.
Sparkling Machinery Co.,Ltd
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Whatsapp: +8613609010879