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2339402220 2339402230 66-91110 F042010673 2.339.402.220, 2.339.402.230, 237753 333478 1658730 E3720 461659 SSB7753BA SSB7753FH SSB7753HE ZM3639 237753 66-91110 SSB7753BA S

2339402220 2339402230 66-91110 24V Starter Solenoid Switch Bosch 561

Applicable models: MERCEDES BENZ /DAF /SCANIA

Reference part number:2339402220 2339402230 66-91110 F042010673 2.339.402.220, 2.339.402.230, 237753 333478 1658730 E3720 461659 SSB7753BA SSB7753FH SSB7753HE ZM3639 237753 66-91110 SSB7753BA SSB7753FH,SSB7753HESSB7753KG,SSB7753LC,SSB7753MHSSB7753UL,SSB8753FX,SSB8753UL,SSB9753HE

Product Attributes

Rated output :	24V
Pulley :
Size :
Weight :	NET WEIGHT:1KG
Packaging :	Neutral kraft paper packaging
Spot/Pre sale :	Spot goods
Warranty :	1 year
Product number :

Product Details

Type :	Starter solenoid switch
Specification :	24V
Pulley :
Brand :	NUO JIN
Number :	2339402220
Quality :	NEW
Delivery time :	10days

2339402220 2339402230 66-91110 F042010673 2.339.402.220,

2.339.402.230, 237753 333478 1658730 E3720 461659 SSB7753BA

SSB7753FH SSB7753HE ZM3639 237753 66-91110 SSB7753BA

SSB7753FH,SSB7753HESSB7753KG,SSB7753LC

,SSB7753LC,SSB7753MHSSB7753UL,SSB8753FX,SSB8753UL,SSB9753HE

Installation Method of 24V Starter Solenoid Switch for Mercedes-Benz / DAF / Scania

This installation method is formulated in accordance with the original factory service manuals (Mercedes-Benz WIS system, DAF Workshop Manual, Scania SDP3 system) and the international commercial vehicle maintenance standard ISO 16357. It is applicable to the replacement and installation of 24V starter solenoid switches for diesel engines of the three above-mentioned vehicle models.

I. Pre-installation Preparation

Tools and Consumables Preparation

Special tools: Torque wrench (range: 0–100 N·m), socket set (8–19 mm), starter support bracket, special crimping tool for solenoid switch terminals.
Consumables: Original 24V starter solenoid switch parts (must match the engine model of the vehicle), high-temperature resistant insulating electrical tape, anti-loosening threadlocker (compliant with ISO 10993 standard), non-corrosive contact cleaner.

Safety Operation Prerequisites

Disconnect the negative cable of the vehicle's 24V battery and wait for more than 5 minutes to ensure the complete discharge of the capacitor inside the starter.
Secure the engine with a bracket to prevent component damage caused by engine shaking during the installation process.
Clean the oil stains and rust on the starter mounting surface and the connection part of the solenoid switch to ensure flat contact surfaces.

II. General Installation Steps (Applicable to All Three Vehicle Models)

1. Pre-positioning of the Solenoid Switch

Align the drive gear guide sleeve of the new solenoid switch with the starter armature shaft, push it in slowly, and ensure there is no jamming between the guide sleeve and the armature shaft.
Confirm that the mounting bolt holes of the solenoid switch are completely aligned with the holes on the starter housing. Forced alignment is strictly prohibited.

2. Fastening the Mounting Bolts

Install the two mounting bolts and manually screw them in until the threads are fitted to avoid bolt skewing.
Tighten the bolts in a cross tightening sequence with a torque wrench, and the torque parameters must strictly comply with the original factory standards:

Mercedes-Benz: 18–22 N·m
DAF: 20–25 N·m
Scania: 19–23 N·m

A small amount of anti-loosening threadlocker can be applied to the tail of the bolts (only for non-through-hole bolts) to prevent loosening caused by vehicle vibration.

3. Electrical Circuit Connection

Main power cable connection: Connect the heavy cable terminal of the 24V battery positive input to the M terminal (main terminal) of the solenoid switch. Tighten the nut with a torque of 12–15 N·m, and install a flat washer and a spring washer to prevent poor contact.
Control circuit connection: Connect the thin wire terminal controlled by the ignition switch to the S terminal (control terminal) of the solenoid switch. Ensure the terminal is firmly clamped without loosening.
After the circuit connection is completed, wrap the exposed terminal parts with insulating tape to avoid short circuits.

4. Mechanical Linkage Inspection

Manually press the push rod of the solenoid switch to check whether the drive gear extends and retracts smoothly without jamming or abnormal noise.
Confirm that the meshing clearance between the drive gear and the flywheel ring gear meets the original factory requirements (clearance value: 1.5–3.0 mm). If the clearance is not up to standard, adjust the thickness of the shim.

Precautions for Installation of 24V Starter Solenoid Switch for Mercedes-Benz / DAF / Scania

These precautions are formulated in accordance with the original factory manuals (Mercedes-Benz WIS, DAF Workshop Manual, Scania SDP3) and the international commercial vehicle maintenance standard ISO 16357, covering the safety specifications, component protection and fault prevention key points throughout the entire installation process.

I. Safety Precautions Before Installation

1. Thorough Power-off Operation

After disconnecting the negative cable of the 24V storage battery, wait for 5–10 minutes to ensure the complete discharge of the capacitor inside the starter. Reconnecting the cable within a short period is strictly prohibited to prevent arc burns or component short circuits.

If the vehicle is equipped with a main power switch, switch it to the OFF position and lock it to avoid accidental power-on caused by others' misoperation.

2. Strict Verification of Component Matching

The model of the solenoid switch must be one-to-one matched with the engine model. For example:

Mercedes-Benz OM471 engine shall be matched with solenoid switch model A0061514701
DAF XF series shall be matched with model 1699956
Scania R series shall be matched with model 2373177

Using mismatched models will directly cause starter burnout or engine failure to start.

Check that the number of teeth of the drive gear and the push rod stroke of the new solenoid switch are consistent with the original factory parameters. Mismatched tooth numbers will cause damage to the meshing of the flywheel ring gear.

3. Requirements for Working Environment and Protection

The working area shall be kept dry and free of flammable and explosive materials. Avoid operation in rainy or humid environments to prevent moisture-induced short circuits of electrical components.

Operators shall wear insulating gloves and goggles, and use insulated tools to prevent electric shock caused by leakage of the 24V circuit.

II. Operational Precautions During Installation

1. Prohibition of Violent Operation in Mechanical Installation

When aligning the solenoid switch with the starter housing, push it in slowly and fit it naturally. Hammering or forced prying is strictly prohibited; otherwise, it will cause deformation of the guide sleeve and bending of the armature shaft, leading to starter jamming failure.

When tightening the mounting bolts, the cross-symmetric tightening sequence must be adopted, and the torque shall be gradually increased to the original factory value in 2–3 steps. Tightening to the rated torque in a single step will cause uneven stress on the housing and thread slipping.

Before installing the bolts, clean the oil stains and iron filings in the threaded holes. A small amount of anti-loosening threadlocker (compliant with ISO 10993 standard) can be applied to non-through-hole bolts. Do not apply threadlocker to through-hole bolts to prevent the adhesive from flowing into the starter interior.

2. Key Points for Standard Electrical Connection

When connecting the main power cable (thick cable) to the M terminal, a flat washer plus a spring washer must be installed. The tightening torque shall be strictly controlled within 12–15 N·m. Excessive torque will easily cause terminal deformation, while insufficient torque will lead to excessive contact resistance and terminal heating and ablation.

When connecting the control circuit (thin wire) to the S terminal, confirm that the terminal type is waterproof plug-in type. Directly winding bare wires on the terminal post is prohibited. After connection, wrap the terminal with insulating tape or install a waterproof sheath.

The control circuit of Scania models must be connected through the relay controlled by the ECU. Direct connection to the ignition switch is strictly prohibited; otherwise, it will exceed the load range of the ECU and cause damage to the internal components of the ECU.

All wire harnesses shall be fixed along the original factory buckles and kept away from high-temperature areas such as exhaust pipes and turbochargers (with a distance of not less than 50mm) to prevent melting and short circuit of the wire harness insulation layer.

3. Key Requirements for Linkage Clearance Inspection

Manually press the push rod of the solenoid switch to check that the extension and retraction stroke of the drive gear complies with the original factory standards:

Mercedes-Benz: 22–25mm
DAF: 20–23mm
Scania: 21–24mm

The meshing clearance between the drive gear and the flywheel ring gear shall be controlled within 1.5–3.0mm. Excessively small clearance will cause gear tooth butting, while excessively large clearance will result in insufficient meshing. The clearance can be calibrated by increasing or decreasing the thickness of the adjusting shim.

References：

I. Sources of Original Factory Technical Documents (Core Basis)

Vehicle Model	Document Name/System	Core Chapter/Number	Key Content
Mercedes-Benz	WIS Service Information System	00-20-01 (24V Starter System)	Installation torque (18–22 N·m), solenoid switch model matching (e.g., OM471 engine with A0061514701 solenoid switch), push rod stroke (22–25 mm)
DAF	Workshop Manual	3.2.10 (Starter and Solenoid Switch)	Installation torque (20–25 N·m), connection specifications for temperature sensor interface, requirements for special tools
Scania	SDP3 Diagnostic & Service System	TPI 23156/2024	Installation torque (19–23 N·m), requirements for ECU relay connection, calibration method for gear meshing clearance

II. International/Industry Standard Basis

ISO 16357-2018: Installation and Safety Specifications for Commercial Vehicle Starter Systems. It specifies the general requirements for power-off operations, component matching and electrical connections.
ISO 10993: Medical-grade Biocompatibility Standard. It is used here to regulate the material safety of anti-loosening threadlocker.
ETRTO (European Tyre and Rim Technical Organisation) Commercial Vehicle Maintenance Specifications: It provides guidelines for DAF models regarding wire harness fixing, high-temperature zone avoidance (≥ 50 mm), etc.
ISO 8100-3-2019: General Installation Standards for Commercial Vehicle Electrical Systems. It guides the relay selection standard for Scania control circuits.

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