600-815-8940 Relay (Komatsu Genuine Starter Relay)

The 600-815-8940 is a 24V starter relay/contactor specifically designed for Komatsu construction machinery. Its primary function is to control the engine starting circuit, and it is compatible with mainstream models such as the PC200-6/7/8, PC220-6/7/8, and others. I. Core Parameters (Official Specifications)

Table

Parameter Item | Specification Details

Model | 600-815-8940 (Alternative models in the same series: 600-815-8941, 203-06-59321)

Brand | Komatsu (OEM) / High-Quality Aftermarket

Type | Starter Relay / Magnetic Contactor

Rated Voltage | 24V DC (Direct Current)

Contact Configuration | Single-Pole Single-Throw, Normally Open (SPNO)

Compatible Models | Komatsu Excavators: PC60-7, PC120-6, PC200-6/7/8, PC220-6/7/8, PC270-8, etc.

Application | Diesel Engine Starting Systems, Construction Machinery Ignition Circuits

Pins | 4-Pin Connector (Universal plug-in type, compatible with OEM sockets)

II. Compatible Equipment and Scenarios

Core Compatibility: Komatsu PC200-6/7/8 and PC220-6/7/8 Excavators, paired with S4D102E and S6D102E series engines.

Extended Compatibility: Models such as PC130-6, PC230LC-6, PC228US-1/2, etc.

Other Equipment: Starter control for other diesel-powered machinery, including Komatsu Wheel Loaders, Bulldozers, Backhoes, etc.

III. Replacement and Compatibility

Direct Replacement: 600-815-8941, 203-06-59321 (Models are interchangeable and functionally equivalent).

Selection Note: You must verify that the voltage is 24V to avoid mixing with 12V models; prioritize aftermarket parts with pin configurations that match the OEM specifications to ensure proper installation fit.

V. Installation and Maintenance Essentials

Power Disconnection: Before installation, you must disconnect the negative terminal of the battery to prevent short circuits. Pin Configuration: Wire according to the standard 4-pin socket definitions (typically pins 85/86 for the coil terminals and 30/87 for the main contact terminals), ensuring correct polarity. 

Secure Mounting: Ensure the pins are firmly seated during installation to prevent looseness, which could lead to poor contact or contact burnout. 

Environmental Protection: Install the unit away from areas subject to high temperatures, oil contamination, or standing water; the use of a protective dust cover is recommended. 

Troubleshooting: In the event of weak starting power or a failure to start, prioritize checking the relay coil voltage (24V) and the continuity of the main contacts; replace the relay if necessary.