Description
Benwil 501-50-1770 Hydraulic Cylinder Seal Kit for GPOA Series 2-Post Lifts – Holmac Cylinder
When a hydraulic cylinder on a Benwil 2-post GPOA-series lift begins to seep oil at the rod or lose holding pressure, this rebuild kit restores proper sealing. This kit is for lifts equipped with a Holmac-brand cylinder. Before ordering, confirm your cylinder is a Holmac by looking for an “H” or “HC” marking, typically enclosed within a teardrop shape on the cylinder body.
Product Information
- Brand / Equipment: Benwil
- Manufacturer / Reference Part Number: 501-50-1770
- Store SKU: BEL1770
- Component: Hydraulic Cylinder Rebuild Seal Kit (Stick Cylinder)
- Cylinder Brand: Holmac (identified by “H” or “HC” mark in a teardrop shape)
- Listed Application: Benwil GPOA7, GPOA8, GPOA9, GPOA10 with Holmac cylinder
Compatible Makes / Verified Fitment Models
- Benwil GPOA7 (with Holmac cylinder – as listed by seller)
- Benwil GPOA8
- Benwil GPOA9
- Benwil GPOA10
Replacement / Cross-Reference Numbers
- Benwil Part Number: 501-50-1770
- Holmac Cylinder Part Numbers: 301061, 301169
Fitment & Ordering Notes
This kit is for Benwil GPOA-series lifts with a Holmac-brand cylinder only. Confirm the cylinder is a Holmac (look for the H or HC mark in a teardrop shape) before ordering. Benwil lifts with different models, different cylinder brands, different stamped numbers, or different serial numbers are not covered. Call 866-902-6060 if you need help identifying your cylinder.
Additional Product Information
Seal kits ship in a sealed clear bag. Do not open the bag until you have removed your old seals from the cylinder and compared them against the new seals inside. If the inside and outside diameters appear similar, you have the correct kit. Opened or used seal bags cannot be returned.

