Description

The Mercury MerCruiser Quicksilver 45528A2 is a genuine Mercury Marine OEM reverse lock valve cover assembly used on select legacy MerCruiser sterndrive power trim systems. This cover is associated with the mechanical reverse lock valve assembly, a system used on older MerCruiser drives to help keep the sterndrive locked down when operating in reverse.

This is a legacy service component and should be matched carefully by the exact reverse lock valve diagram, trim system configuration, and drive serial number before ordering.

Key Features

• Genuine Mercury Marine factory OEM reverse lock valve cover assembly.
• Mercury/MerCruiser part number: 45528A2.
• Alternate printed/catalog references may include 45528A 2 and 45528.
• Used on select older MerCruiser power trim reverse lock valve assemblies.
• Helps retain and protect components within the reverse lock valve cover area.
• Associated with hydraulic trim systems that use a mechanical reverse lock valve arrangement.
• GTIN/UPC reference: 745061152830.
• Listed weight reference: 0.27 lb.
• Legacy/NLA-style service part; availability may depend on remaining old-stock inventory.

Application Compatibility

Common application context includes select legacy MerCruiser sterndrive power trim systems by serial number and hydraulic diagram location, especially older drive setups equipped with a mechanical reverse lock valve assembly.

Use this cover only where the Mercury/MerCruiser power trim or reverse lock valve diagram specifically calls for 45528A2 / 45528.

Fitment Notice

Confirm fitment by sterndrive serial number, trim pump/valve style, reverse lock valve assembly diagram, and related service parts before ordering. MerCruiser used different trim systems, reverse lock hardware, valve bodies, covers, check balls, O-rings, washers, and screws across older drive families, so the part number and diagram location should be verified before installation.

When This Part Needs Replacement

Replace this cover assembly if the original cover is cracked, corroded, leaking, distorted, stripped, missing, or damaged during reverse lock valve service. It should also be inspected if there is hydraulic fluid leakage at the reverse lock valve, drive kick-up in reverse, loss of reverse lock function, damaged sealing hardware, or evidence that the cover is not clamping evenly against the valve body.

Installation Notes

Service this area carefully because older reverse lock valve bodies and hydraulic components can be easily damaged. Clean the mounting surface before installation and inspect the related sealing components before reassembly. Replace the cover O-ring and any worn check-valve parts if the service diagram calls for them. Tighten the mounting hardware evenly and avoid forcing seized screws, as cracking or distorting the valve body can cause hydraulic leakage or loss of reverse lock pressure.

Related Service Parts

Common related reverse lock valve service components may include:

• 25-45711 — valve cover O-ring reference
• 30-45712 — valve/check ball reference
• 12-45713 — retaining washer reference
• Reverse lock valve mounting screws and related hydraulic hardware as shown in the factory diagram

Confirm all related parts by the exact Mercury/MerCruiser reverse lock valve diagram before ordering.

Alternate/Superseded Part Numbers

• 45528A2 — Mercury/MerCruiser service part number
• 45528A 2 — alternate printed/catalog spacing reference
• 45528 — base/reference number; verify by diagram and application

Parts Desk Insight

Reverse lock valve parts are tied closely to the specific trim system and drive generation. If the drive is not staying locked down in reverse, inspect the full reverse lock valve assembly rather than replacing only the cover. A leaking O-ring, worn check ball, damaged valve seat, cracked valve body, or incorrect hardware can all cause similar symptoms.

Shipping: Ships same or next day for fast Canada wide shipping.