Everything You Need to Know About the Komatsu 707-98-38600 Hydraulic Cylinder Seal Kit
Hydraulic cylinder leaks can stall your job site, drain your fluids, and compromise the operating power of your Komatsu heavy equipment. If you are servicing an arm cylinder on a Komatsu PC100, PC120, or PW100 series machine, replacing worn seals is the most cost-effective way to restore hydraulic performance and prevent costly fluid loss.
Here is a breakdown of the new Komatsu Aftermarket Seal Kit (Part # 707-98-38600 / KOM-707-98-38600), including specs, compatible machine models, and key verification details.
Technical Specifications
| Parameter | Specification |
| Part Number | 707-98-38600 / KOM-707-98-38600 |
| Condition | Brand New Aftermarket |
| Primary Application | Arm Cylinder (Stick Cylinder) |
| Rod Diameter | 75 mm (approx. 2.95 in) |
| Bore Diameter | 110 mm (approx. 4.33 in) |
Machine Compatibility & Application Guide
This seal kit fits specific Komatsu -3 series excavators and wheel excavators. Check your machine’s model name, cylinder part number, and serial number against the chart below to ensure a precise fit.
| Model | Application | Cylinder Part # | Rod Size | Bore Size | Serial Number Range |
| PC100-3 | ARM | 202-63-62500 | 75 mm | 110 mm | 10001 – 19852 |
| PC100-3 | ARM | 202-63-69300 | 75 mm | 110 mm | 19853 – Up |
| PC100L-3 | ARM | 202-63-62500 | 75 mm | 110 mm | 12001 – 12137 |
| PC100L-3 | ARM | 202-63-69300 | 75 mm | 110 mm | 12138 – Up |
| PC100U-3 | ARM | 202-63-62500 | 75 mm | 110 mm | 12001 – 12019 |
| PC100U-3 | ARM | 202-63-62502 | 75 mm | 110 mm | 12020 – Up |
| PC120-3 | ARM | 203-63-62500 | 75 mm | 110 mm | 18001 – 20335 |
| PC120-3 | ARM | 203-63-62502 | 75 mm | 110 mm | 20336 – 24709 |
| PC120-3 | ARM | 203-63-69300 | 75 mm | 110 mm | 24710 – Up |
| PW100N-3 | ARM | 202-63-62500 | 75 mm | 110 mm | 1601 – 1667 |
| PW100N-3 | ARM | 202-63-62502 | 75 mm | 110 mm | 1668 – 2300 |
| PW100N-3 | ARM | 20D-63-02030 | 75 mm | 110 mm | 2301 – Up |
Why Choose an Aftermarket Seal Kit?
- Cost Efficiency: Premium aftermarket seal kits deliver OEM-level durability and oil resistance without the high manufacturer markup.
- Complete Maintenance: Replacing the entire seal pack (rod seals, piston seals, wipers, and wear rings) prevents premature wear caused by mixing old and new components.
- Reduced Downtime: Keeping a replacement kit on hand allows quick rebuilding on-site as soon as fluid seepage or drift is detected.
Important Ordering Tip: Verify Before You Buy
Hydraulic cylinder configurations can vary depending on machine production dates, serial breaks, or previous equipment modifications.
Before placing your order:
- Check your machine serial number.
- Verify the cylinder body part number stamped on the cylinder barrel.
- Confirm the rod (75 mm) and bore (110 mm) dimensions.
