Tilt Trim Motor – Fits Mercury/Mariner 135-250HP (Replaces 878265A1, 828708T)
Tilt Trim Motor – Fits Mercury/Mariner 135-250HP (Replaces 878265A1, 828708T) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Tilt Trim Motor – Fits Mercury/Mariner 135-250HP (Replaces 878265A1...
Tilt Trim Motor – Fits Mercury/Mariner 135-250HP (Replaces 878265A1, 828708T) is backordered and will ship as soon as it is back in stock.
Product Details
This replacement Tilt Trim Motor – Fits Mercury/Mariner 135-250HP 1996-UP (Replaces 878265A1, 828708T) is engineered to restore trim and tilt functionality to a wide range of Mercury and Mariner outboards. It is designed for 135HP, 150HP, 175HP, 200HP, 225HP, and 250HP 4-Stroke models from 1996 and newer, as well as 105-140HP Jet drive applications.
It serves as a direct cross-reference for Mercury/Mariner parts 828708, 828708T, 878265A1, 878265A4, and 8M0031551, along with aftermarket equivalents from Sierra (18-6773), Mallory (9-18204), Arco (6250), and MES (T1082M).
- Easy direct bolt-on installation.
- Features a standard 2-wire connection with bullet connector ends.
- The reversible motor rotation allows for proper up and down operation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury/Mariner | 828708 |
| Mercury/Mariner | 828708T |
| Mercury/Mariner | 878265A1 |
| Mercury/Mariner | 878265A4 |
| Mercury/Mariner | 8M0031551 |
| Sierra | 18-6773 |
| Mallory | 9-18204 |
| Arco | 6250 |
| MES | T1082M |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | All Models | 135 | 4-Stroke | 1996–ON | 828708, 828708T, 878265A1, 878265A4 | Tilt/Trim All Models |
| Mercury | All Models | 150 | 4-Stroke | 1996–ON | 828708, 828708T, 878265A1, 878265A4 | Tilt/Trim All Models |
| Mercury | XR6 | 150 | 4-Stroke | 1996–ON | 828708, 828708T, 878265A1, 878265A4 | |
| Mercury | Mag III | 150 | 4-Stroke | 1996–ON | 828708, 828708T, 878265A1, 878265A4 | |
| Mercury | All Models | 175 | 4-Stroke | 1996–ON | 828708, 828708T, 878265A1, 878265A4 | |
| Mercury | XRI | 175 | 4-Stroke | 0D082000–0G303045 | 828708 | USA Cat# 90-81741892 |
| Mercury | SKI | 175 | 4-Stroke | 0D082000–0G303045 | 828708 | USA Cat# 90-81741892 |
| Mercury | All Models | 200 | 4-Stroke | 1996–ON | 828708, 828708T, 878265A1, 878265A4 | |
| Mercury | MAG, XRI | 200 | 4-Stroke | 0D082000–0G303045 | 828708 | USA Cat# 90-81741892 |
| Mercury | PRO MAX, SUPER MAG | 200 | 4-Stroke | 0D935000–0G610079 | 828708 | Belgium Cat# 90-80856794 |
| Mercury | PRO MAX, SUPER MAG | 200 | 4-Stroke | 0G857000–0G858150 | 828708 | Belgium Cat# 90-803922 |
| Mercury | All Models | 225 | 4-Stroke | 1996–ON | 828708, 828708T, 878265A1, 878265A4 | |
| Mercury | PRO MAX SUPER MAG | 225 | 4-Stroke | 0G610104–0G856999 | 828708 | USA Cat# 90-80918498 |
| Mercury | All Models | 250 | 4-Stroke | 1996–ON | 828708, 828708T, 878265A1, 878265A4 | |
| Mercury | All Models | 250 | 4-Stroke | 0G129222–0G760299 | 828708 | USA Cat# 90-80917095 |
| Mercury | Jet | 105-140 | 4-Stroke | 1996–ON | 828708, 828708T, 878265A1, 878265A4 | |
| Mercury | Jet | 140 | 4-Stroke | 0G760300–0G960499 | 828708 | USA Cat# 90-803170 |
Technical Specs
- Product Type
- Tilt Trim Motor
- Installation
- Direct replacement
- Connection
- 2-wire connection with bullet connector ends
- Housing Material
- Metal
- Housing Color
- Black
- Dimensions
- Length: 124.7mm (4.909in); OD: 75mm (2.953in); Shaft OD: 8mm (0.315in)
- Weight
- 1.54kg (3.39lb)
- Fitting Type
- Direct bolt-on
- Rotation
- Reversible
- Current Type
- DC
- Shaft Type
- Tanged Shaft
What’s in the Box
- 1 x Tilt Trim Motor
Installation Notes
- Disconnect the boat's battery terminals to prevent electrical shorts.
- Secure the outboard motor in the fully tilted position using the tilt lock lever or a suitable brace.
- Locate and disconnect the electrical leads for the existing tilt trim motor.
- Carefully unbolt and remove the old motor. Be prepared for potential residual hydraulic fluid.
- Clean the mounting surface and surrounding area to ensure a good seal.
- Mount the new tilt trim motor, ensuring it is aligned correctly, and tighten the mounting bolts to the manufacturer's specified torque.
- Connect the electrical leads of the new motor, matching the wire colors to the harness.
- Reconnect the battery terminals.
- Carefully disengage the tilt lock and test the motor's operation, checking for smooth up and down movement and listening for any unusual noises.
Troubleshooting & FAQ
How do I know if my tilt trim motor is failing?
Common signs of a failing motor include slow or jerky operation, a humming or clicking sound without movement, or the motor failing to operate entirely. You may also notice hydraulic fluid leaks around the motor seals.
Will this fit models outside the listed years?
We can only guarantee fitment for the models and years specified. Using this part on other models is not recommended, as even small differences can affect performance and safety. Always compare your old part to the images and specifications.
What is the difference between the various replacement part numbers?
The numbers listed (e.g., 878265A1, 8M0031551) represent different revisions or part numbers used by Mercury/Mariner and various aftermarket brands over time for the same component. This part is designed to be a direct replacement for all of them.
Is the motor's rotation reversible?
Yes, this motor is reversible. The direction of operation (up or down) is controlled by reversing the polarity of the DC current, which is handled by your boat's trim relay and switch system.
What maintenance does this motor require?
The motor itself is a sealed unit and requires no internal maintenance. Periodically inspect the electrical connections for corrosion and ensure the motor housing remains clean and free of debris.
Can I replace just the motor without replacing the whole trim assembly?
Yes, this part is just the electric motor. If your hydraulic pump and ram assembly are in good condition, you can replace only the motor, which is often the point of failure.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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