510101 US Automatic Patriot Actuator Rear Cover Gasket

510101 US Automatic Patriot Actuator Rear Cover Gasket

The US Automatic 510101 is the rear cover gasket used on select Patriot linear actuator arms. It seals the rear cover area where service access, motor components, and internal actuator parts may be exposed during repairs. Outdoor actuators rely on properly fitted seals to keep rain, irrigation water, dirt, insects, and corrosion away from the moving and electrical components inside the housing. A flattened, torn, or missing rear cover gasket can allow moisture to enter the actuator, leading to intermittent operation, corrosion, noisy travel, or shortened component life. This gasket is commonly replaced whenever the rear cover is removed for motor, wiring, limit, or internal actuator service. It should not be confused with the 510100 gearbox inner gasket.

Compatible With

This compatibility list is based on known US Automatic Patriot service-part usage and should be verified against the original operator label, actuator parts diagram, and existing part number before ordering.

• US Automatic Patriot swing gate linear actuator arms
• Patriot heavy-duty swing gate openers using the original US Automatic actuator assembly
• Patriot single swing gate installations where the actuator parts diagram calls for this service part
• Patriot dual swing gate systems when each actuator uses the same matching service component
• Select older Patriot actuator assemblies when confirmed by the original part number and parts diagram

Also Known As / Related Part Numbers

• 510101
• US-510101
• USA 510101
• Patriot rear cover gasket
• Patriot actuator rear gasket
• rear cover gasket for Patriot actuator
• 510100 related gear box inner gasket
• 510020 related stainless cover tube
• 510109 related actuator motor

Features & Specifications

Technician Note

Do not reuse a damaged or compressed actuator gasket after internal service. A low-cost seal can prevent repeat moisture problems inside the actuator.

Before Ordering Checklist

• Confirm the actuator is a Patriot swing actuator.
• Match the gasket by part number and location in the parts diagram.
• Inspect the mating surfaces for dirt, corrosion, or old gasket residue.
• Check for water intrusion or corrosion inside the actuator before closing it.
• Confirm the cover is seated evenly after gasket replacement.

Professional Advisory

Internal actuator service can affect gate travel, limit adjustment, and safe stopping behavior. Disconnect power before service and have a qualified gate technician handle repairs if the actuator binds, the gate moves unexpectedly, or electrical damage is present.

Product Questions & Answers

Is this gasket a complete actuator repair kit?

No. It is a single gasket service part. Other actuator parts must be ordered separately if needed.

Why should the gasket be replaced?

A worn or damaged gasket can let moisture and debris into the actuator, causing corrosion, binding, or repeat service issues.

Is this the same as the other Patriot actuator gasket?

No. Patriot actuator gaskets are location-specific. Match 510100 and 510101 by the parts diagram and where the gasket is installed.

Should I inspect other parts while replacing it?

Yes. Inspect the cover tube, screw assembly, motor area, wiring, and any signs of water intrusion.

Can a bad gasket cause electrical issues?

It can contribute to moisture intrusion, which may damage wiring, switches, or other internal components over time.