12V 4KW 10T Starter Motor 2873A030 for HY-MAC

Overview of the 2873A030 Starter Motor

The 2873A030 starter motor is a 12V, 4 kW unit built for HY-MAC. It is a reduction-gear starter with a pre-engaged solenoid, assembled to the original mounting flange and terminal positions so it fits without adapters or wiring changes.

Every unit is bench tested at the factory for current draw, solenoid pull-in and pinion throw, because those three values decide whether a starter works in a cold engine bay as well as it does on a test bench.

Key Specifications

• Rated voltage: 12V
• Rated output: 4 kW
• Pinion: 10 teeth
• Type: reduction gear starter with pre-engaged solenoid
• Application: HY-MAC
• Net weight: approximately 10.05 kg
• Condition: new, direct replacement for the original unit

A 12V 4 kW rating is the output the motor can hold while cranking, not a peak figure. It is sized so the engine reaches starting speed on the first or second revolution, which is what makes a healthy start feel immediate.

The drive end housing is cast aluminium and carries the pinion bearing, so the pinion stays square to the ring gear when the motor delivers full torque.

Reference Numbers and Cross References

Cross references for this starter are listed below. They are a matching aid rather than a substitute for checking the number on the old unit:

• 2873A030
• 2873B071
• 115393
• 11131575
• AZF4148.IS1160
• AZF4148.IS116
• STB5393LP
• STI5393LC
• STI5393SU
• STI5393UL
• MS295
• 3581576M1
• 3581576R1
• 3930508R1
• STI5393WA
• 1446802M91

Several numbers in this list belong to complete starter assemblies while others refer to the motor only. A visual check of the drive end protects against the most common ordering error. This starter is listed with 16 references in total.

Application Notes

HY-MAC applications in this range share the same mounting pattern and terminal layout, which is why one reference can serve several model years. Fitment is still decided by the starter number rather than by the badge on the vehicle. Fitting the 2873A030 correctly takes less time than diagnosing the original fault.

Vehicles that have had an engine or gearbox replacement may already carry a different starter from the one the catalogue expects, so treat the paperwork as a starting point rather than the final answer.

Common Failure Patterns

Most failures start at the solenoid contact. Each start switches the full cranking current through a copper disc, and after thousands of cycles that disc pits and burns. The result is the familiar single click with no rotation, or a delay before the motor turns.

Heat is the underlying cause in most cases. The starter sits close to the exhaust, and after a hot shutdown the solenoid winding and brush plate soak in heat with no airflow. Resin hardens, springs lose tension and the contact oxidises. Owners of HY-MAC should treat the 2873A030 reference list as a starting point, not the final answer.

What to Look For

• Cranking that sounds normal but takes longer than it used to
• Several attempts needed before the motor engages
• Black carbon dust inside the drive end housing
• Voltage dip that dims the lights during cranking
• Starter that responds to a tap on the housing but not to the key alone

Rule out the simple causes first: battery capacity under load, corroded terminals and the signal wire at the solenoid. A starter that clicks with a known-good battery and a clean signal circuit has an internal contact fault. The 2873A030 is built to the same flange pattern as the unit it replaces.

Before You Fit the Replacement

• State of charge and age of the battery
• Corrosion on the earth strap and the engine-to-body bond
• Pinion tooth count against the ring gear
• Free movement of the new pinion before fitting
• That the signal wire connector seats fully on the solenoid

Most comebacks after a starter replacement trace back to something that was not checked before the unit went on: a tired battery, a corroded earth or a chipped ring gear. Ten minutes with a multimeter and a torch prevents the second repair.

Installation Procedure

Disconnect the battery negative terminal, remove the intake parts that restrict access, then disconnect the main cable and the solenoid signal connector. Support the starter before removing the mounting bolts.

After fitting, confirm the pinion returns freely and the cables are clear of the exhaust. Crank once before the first drive, then re-check the main terminal for tightness after the first heat cycle. For the 2873A030, the practical check is the number stamped on the housing.

Quality Control and Supply from Hejian Nuojin Auto Parts Co., Ltd.

Hejian Nuojin Auto Parts Co., Ltd. manufactures starter and alternator components for the aftermarket. Every unit is bench tested for no-load current draw, solenoid pull-in and release voltage, pinion throw and running noise before packing.

Standard references are held as spot goods, volume orders are delivered in around 30 days, and every unit carries a one-year warranty against manufacturing defects.

Frequently Asked Questions

Why does the starter work cold but fail when hot?

Heat raises solenoid resistance and reduces brush spring pressure. Both effects build up gradually and appear first on a hot restart.

Does the starter need any maintenance?

No routine maintenance is required. Keeping the battery, terminals and earth connections clean is what extends starter life in practice.

Can the solenoid be replaced on its own?

It is possible, provided the motor draws normal current and the pinion is sound. Where the brushes are already short, replacing the complete starter avoids a second repair within a year.

How do I confirm the starter matches my vehicle?

Read the number on the starter body or on the old unit and compare it with the reference list above. Where the label is missing, match the pinion teeth and the terminal bracket against the photographs.