The 2021 Freightliner Cascadia has 12 steering parts with verified fitment on this page — 5 part types and 5 brands, covering all 6 engine options (11.9L DIESEL, 11.9L Turbocharged, 12.8L L6 DIESEL Turbocharged, 14.8L L6 DIESEL Turbocharged and more). Each part includes a manufacturer part number and application notes.
On the 2021 Freightliner Cascadia, the steering system connects driver to road through the rack, pump, tie rods, and column components. Most of the listed parts are King Pin Set (6 parts), O-Ring (2 parts) and Power Steering Filter (2 parts). The other 2 part types cover the remaining 2 parts.
The 2021 Freightliner Cascadia was sold with 6 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
5 brands supply steering parts for the 2021 Freightliner Cascadia, led by MEVOTECH (6 parts), ELRING (3 parts) and DAYTON (1 part), plus 2 more brands.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 Freightliner Cascadia. 2 parts have it, including MEVOTECH MS95988 (King Pin Set) and MEVOTECH MS95987 (King Pin Set). Each part number opens a page with every vehicle that part fits.
King Pin Repair Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DAYTON Fits: 11.9L DIESEL, 15.6L L6 DIESEL Turbocharged | 300414 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Detroit Alliance Front Axle | View on Amazon |
This table covers the King Pin repair kits.
One part is listed for the 2021 Freightliner Cascadia — DAYTON 300414.
King Pin Set
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MEVOTECH Popular Fits: 11.9L DIESEL, 15.6L L6 DIESEL Turbocharged | MS95988 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Supreme | View on Amazon |
| MEVOTECH Popular Fits: 11.9L DIESEL, 15.6L L6 DIESEL Turbocharged | MS95987 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Supreme | View on Amazon |
| MEVOTECH Fits: 11.9L DIESEL, 15.6L L6 DIESEL Turbocharged | MS95996 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Supreme | View on Amazon |
| MEVOTECH Fits: 11.9L DIESEL, 15.6L L6 DIESEL Turbocharged | MS95989 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | SupremeContains Pre-Sized Metal Bushings | View on Amazon |
| MEVOTECH Fits: 11.9L DIESEL, 15.6L L6 DIESEL Turbocharged | MS959106 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | SupremeContains Pre-Sized BI-Metal Bushings | View on Amazon |
| MEVOTECH Fits: 11.9L DIESEL, 15.6L L6 DIESEL Turbocharged | MS959105 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Supreme | View on Amazon |
This table covers the King Pin sets.
6 King Pin Set parts for the 2021 Freightliner Cascadia come from MEVOTECH. The "Popular" part is MEVOTECH MS95988.
This group includes MEVOTECH MS95988, MEVOTECH MS95987 and MEVOTECH MS95996 and the remaining parts above.
O-Ring
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: 15.6L L6 DIESEL Turbocharged | 653770 | 🇺🇸 US 🇨🇦 CA | Inner Diameter [MM]: 155 | View on Amazon |
| ELRING Fits: 15.6L L6 DIESEL Turbocharged | 653760 | 🇺🇸 US 🇨🇦 CA | Inner Diameter [MM]: 138.5 | View on Amazon |
This table covers the O-rings that seal this joint. Typical signs include a seep at a fitting or a housing that weeps after a service. Lube the new O-ring with the fluid it will see, and do not roll it into the groove.
2 O-Ring parts for the 2021 Freightliner Cascadia come from ELRING.
Part numbers include ELRING 653770 and ELRING 653760.
Power Steering Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DONALDSON Fits: 15.6L L6 DIESEL Turbocharged | P573482 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Outer Diameter: 67.5 mm (2.66")Length: 89.1 mm (3.51") | View on Amazon |
| HASTINGS / BALDWIN Fits: 11.9L DIESEL, 15.6L L6 DIESEL Turbocharged | PT23629 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Power Steering filters. Typical signs include restricted flow — long cranking, weak airflow, or dirty fluid after a short interval. Seat the new filter so it cannot bypass, and use the grade the notes call for.
2 Power Steering Filter parts for the 2021 Freightliner Cascadia come from 2 brands — DONALDSON and HASTINGS / BALDWIN.
This group includes DONALDSON P573482 and HASTINGS / BALDWIN PT23629.
Steering Gear Housing Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: 15.6L L6 DIESEL Turbocharged | 651250 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the seals at the Steering Gear Housing. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
This group shows a single part: ELRING 651250.
Buying Steering Parts for a 2021 Freightliner Cascadia
On this vehicle, the steering system connects driver to road through the rack, pump, tie rods, and column components.
- Match the engine first. Every steering part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the inner and outer tie-rod ends together on higher-mileage vehicles, then get an alignment.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: King Pin Set and O-Ring .
Frequently Asked Questions
How many steering parts fit the 2021 Freightliner Cascadia?
Our catalog currently lists 12 steering parts for the 2021 Freightliner Cascadia across 5 subcategories and 5 brands, covering all 6 engine options (11.9L DIESEL, 11.9L Turbocharged, 12.8L L6 DIESEL Turbocharged, 14.8L L6 DIESEL Turbocharged and more). Each part is matched to the engine(s) it fits.
Do steering parts differ between 2021 Freightliner Cascadia engines?
Yes. Every steering part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of steering problems on a 2021 Freightliner Cascadia?
Common symptoms include play or looseness on center, a whine when turning, fluid weeping from rack boots, or uneven tire wear on the front axle. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the inner and outer tie-rod ends together on higher-mileage vehicles, then get an alignment.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 Freightliner Cascadia was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 Freightliner Cascadia?
First match the engine — each row shows which engine(s) the part fits. Then flush old power-steering fluid when replacing a pump or rack — grit in the old fluid is the number-one cause of repeat failure. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Freightliner Cascadia
Steering Parts for Other Freightliner Cascadia Years
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