I. Product Specifications

OE Part Numbers: 119802-77200, YM119802-77200; Internal Model: R11EA; Type: DC 12V Genuine Solid-State Time-Delay Safety Relay

Connector: Dual large white sockets (5-pin + 4-pin); Features a black plastic housing with integrated mounting tabs; Genuine direct-plug design requiring no wiring modification

Aliases: Starter Safety Controller, Pre-heat Timer Relay, Alternator Speed-Sensing Safety Module; Genuine NTK OEM Component

Operating Logic: Relies on the alternator's 1200 RPM speed signal to unlock the starter circuit; Provides dual-layer protection featuring a cold-engine pre-heat delay combined with an anti-prolonged-cranking safeguard

II. Compatible Engines (Full Yanmar TNV Series)

3TNV70/76/82A, 3D76E/82AE/84E/88E, 4TNV84/88/94L/98T, 4D88E/4D94LE

III. Compatible Machinery (Key Models in the Mini/Micro Excavator Segment)

Hitachi: ZX17U-2; ZX30U/33U/35U/38U/48U/50U-3F; ZX60USB-3F; ZX14/16/18-3

Domestic Excavators: Sany SY55/SY65/SY75; XCMG 60; Liugong 906D; Sunward; Foton Lovol (Mini/Micro Excavator Series)

Kubota / John Deere: 17D/27D/35D/50D; 17G/26G (Small Excavator Series)

IV. Core Functions

Pre-heat Delay: In low-temperature environments, controls the timed operation of the glow plugs to enhance cold-start performance

Speed-Sensing Safety Lockout: Disengages the pre-heat circuit only after the engine has started and the alternator has established a sufficient rotational speed; Prevents accidental re-cranking of the starter motor after the engine has shut down, thereby protecting the starter motor and flywheel ring gear from burnout

Overload Protection: Locks out the starter circuit in the event of low battery voltage or a wiring short circuit

V. Symptoms of Malfunction Turning the key results in no start, and the glow plug indicator remains continuously illuminated: Internal timing mechanism of the relay is defective.

Glow plugs preheat successfully, but the starter motor remains unresponsive: Engine speed detection circuit has failed.

Starter motor runs continuously without disengaging, leading to gear grinding and motor burnout: Internal electrical contacts have fused together.

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