Mercury MerCruiser Reverse Lock Valve Cover Assembly - 45528A2
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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. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
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