I. Core Parameters and Specifications

Part Number: 417-43-26212, 4174326212

Official Name: FNR Selector Switch / Transmission Switch

Replacement Model: 417-43-26211 (Same series; functionally identical)

Type: Multi-position Combination Switch (F: Forward / N: Neutral / R: Reverse)

Electrical Characteristics:

Multi-pin Waterproof Connector (Typically 8–12 pins)

Power Supply: 12V/24V DC (Compatible with Komatsu loader systems)

Output: Multiple switching signals corresponding to F/N/R gear positions

Protection Rating: IP67

Mechanical Parameters:

Mounting: Lever-type / Panel-type; compatible with original Komatsu control levers

Operating Temperature: -40°C to 125°C

Weight: ≈0.8 kg

Core Functions:

Transmits F/N/R gear position signals to the transmission ECU

Controls the engagement/disengagement of the transmission clutch

Enables switching between Forward, Neutral, and Reverse, including safety interlocks

II. Compatible Models (Komatsu Wheel Loaders)

WA320-3/5/6, WA350-3/5/6, WA380-3/5/6

WA400-3/5/6, WA420-3/5/6, WA470-3/5/6

WA500-3/5/6

III. Fault Symptoms and Diagnosis

Typical Symptoms:

Unresponsive when shifting gears; unable to switch between F/N/R

Instrument panel displays transmission gear fault codes

Automatic shifting to Neutral while driving; erratic gear selection

Oxidation or poor contact within the switch's internal contacts

Quick Diagnostics:

Circuit Testing: Measure continuity across the connector pins to verify F/N/R gear signals

Substitution Test: Replace the unit with model 417-43-26211 to verify if the fault is resolved

ECU Diagnosis: Connect the Komatsu diagnostic tool and read the gear selector switch fault codes.

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