Mitsubishi Fuso Canter King Pin Kit KP550 MC994307 OEM Fit

The King Pin Kit with reference code KP550 and OEM number MC994307 is a verified direct-fit replacement for Mitsubishi Fuso heavy trucks equipped with 6D14 / 6D15 / 6D16 / 6D22 diesel engines. This king pin kit is a critical steering knuckle component that connects the front axle to the steering knuckle, allowing the front wheels to pivot for steering while supporting the vehicle's weight.

The king pin kit serves as the pivot point for the steering knuckle on the front axle. It allows the knuckle to rotate for steering while maintaining precise alignment between the axle beam and the knuckle assembly. The king pin must withstand both vertical loads (vehicle weight) and horizontal loads (steering forces, braking forces, and road impacts). The KP550 kit includes a Φ45*216 mm hardened 40Cr alloy steel king pin, bronze bushings, thrust bearings, shims, seals, and mounting hardware. The rubber O-rings and seals prevent contamination from entering the bushing area, while the thrust bearing supports the vertical load and ensures smooth steering rotation. The 6D14 is a 6.55L inline-six diesel engine, the 6D15 is a 6.9L variant, the 6D16 is a 7.5L engine, and the 6D22 is an 11.1L engine, all widely used in Mitsubishi Fuso heavy trucks from 1976 to 1999.

Replace the king pin kit when any of these symptoms appear:

• Steering wander or excessive steering play — worn king pin bushings allow the knuckle to move, causing the vehicle to wander on straight roads.

• Uneven or accelerated front tire wear — misaligned knuckle geometry from worn king pins causes cupping or scalloped tire wear patterns.

• Front end shimmy or vibration — loose king pins allow the front wheels to oscillate at certain speeds.

• Hard steering or binding — seized or corroded king pins prevent smooth steering operation.

• Clunking or knocking noise from the front axle — excessive clearance between the king pin and bushings causes metal-to-metal contact.

⚠️ Critical Inspection Note: Mitsubishi service manuals require that the king pin be replaced, never reused, when the knuckle is removed. Always replace king pins, bushings, bearings, and seals as a complete kit. Inspect the axle beam king pin bore for wear or elongation — if damaged, the axle beam must be replaced. Always use new king pin bolts and nuts. After installation, a professional wheel alignment must be performed to restore correct steering geometry. Press-fit the kingpin bushing so that the gap between the bushing and knuckle is within 0 to 1 mm (0 to 0.039 in.).

Brand	Model	Chassis	Engine	Years
Mitsubishi	Fuso Fighter	FM215	6D14 / 6D15	1976–1985
Mitsubishi	Fuso Fighter	FM515	6D14 / 6D15	1984–1989
Mitsubishi	Fuso Fighter	FK455	6D14 / 6D15	1986–1991
Mitsubishi	Fuso Fighter	FK457	6D14 / 6D15	1989–1991
Mitsubishi	Fuso Great	FU410NS	6D40	—
Mitsubishi	Fuso Fighter	FM657	6D16	—
Mitsubishi	Fuso Fighter	FS415	6D16	—
Mitsubishi	Fuso	FM104	—	1976–1979

Engine-Specific Applications

Engine Model	Displacement	Common Applications
6D14	6.55L	FM215, FM515, FK455, FK457
6D15	6.9L	FM215, FM515, FK455, FK457
6D16	7.5L	FM657, FS415
6D22	11.1L	FM series heavy trucks
6D40	12.0L	FU410NS

⚠️ Important Fitment Notes:

• This king pin kit is designed for the front axle application. Confirm the king pin diameter (Φ45 mm) and length (216 mm) against your original component before ordering.

• The MC994307 is the primary OEM cross-reference for this kit. The MC811604, MC999970, MC750433, and MC807430 are related OEM numbers for the same application.

• The KP550 kit is compatible with a wide range of Mitsubishi Fuso chassis, including FM215 (1976–1985), FM515 (1984–1989), FK455 (1986–1991), FK457 (1989–1991), FU410NS, FM657, and FS415.

• The KP531 / KP-531, KP521 / KP-521, and KP538 / KP-538 are interchangeable kit references for the same application.

• Always use new king pin bolts and nuts — never reuse old fasteners.

• After installation, a professional wheel alignment must be performed to restore correct steering geometry.

• For right-hand drive (RHD) vehicles, verify clearance and orientation. Refer to the Mitsubishi workshop manual for the correct procedure.

Company Details

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Yimi (Guangzhou) Automotive Parts Co., Ltd. Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ... Yimi (Guangzhou) Automotive Parts Co., Ltd. Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ...

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