The Multiquip 690690 O-Ring Seal MD80 is a genuine OEM seal designed for the MD80 hydraulic ride-on power trowel. As a direct OEM replacement, this seal is manufactured to the exact material grade and compression specification required by the MD80 platform, ensuring a proper hydraulic or fluid system seal without fitment guesswork. Sourced directly through authorized Multiquip distribution, 690690 is the correct part for operators and technicians servicing MD80 trowels. DHS Equipment stocks this part to keep your finishing equipment back in service fast.
Key Features
- OEM-Grade Seal Material — Manufactured to the exact elastomer compound and durometer specification required for the MD80 hydraulic system, maintaining proper compression and sealing integrity under operating pressures.
- Drop-In Replacement — Dimensioned to seat correctly in the original groove or port on the MD80, allowing straightforward installation without modification to surrounding components.
- Confirmed MD80 Fitment — Engineered specifically for the MD80 mid-sized hydraulic ride-on power trowel; cross-reference part number 690690 before ordering to confirm your application.
- Hydraulic System Integrity — A correctly seated O-ring prevents fluid bypass and pressure loss in the hydraulic circuit, allowing the MD80's blade pitch and drive functions to operate at full responsiveness and control.
- Prevents Fluid Leakage and Contamination — A worn or damaged O-ring allows hydraulic fluid to leak past sealing surfaces, leading to pressure drop, erratic blade control, and potential contamination of surrounding components — making timely replacement critical to trowel performance.
An O-ring seal creates a static or dynamic fluid-tight barrier between mating components in a hydraulic or fluid system. On the MD80 hydraulic ride-on power trowel, O-rings are used throughout the hydraulic circuit — at fittings, valve bodies, and pump connections — to prevent fluid from escaping under pressure. When an O-ring degrades, cracks, or takes a set from heat and age, it loses its ability to maintain that seal, resulting in hydraulic fluid leaks, reduced system pressure, and inconsistent response from the blade pitch and drive controls. Replacing a worn O-ring with the correct OEM-specification part restores the seal to its intended performance and prevents further damage to surrounding hydraulic components.
Part Details
| Part Number | 690690 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | O-Ring Seal MD80 |
Compatibility & Fitment
| Name | Model |
|---|---|
| Hydraulic Ride-On Power Trowels | MD80 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
