OEX Starter Motor 12V 9 Tooth CW Denso Style DXS637

The OEX DXS637 is a new 12V starter motor with 9 teeth, clockwise rotation and a Denso style fitment profile. It is rated at 1kW and uses a 2 hole starter mount, with mount centres of 120mm, a 95mm flange diameter and 13mm mount hole diameter.

Physical dimensions are important with starters, and this unit measures 190mm overall length with a 32mm pinion diameter and 22mm pinion at rest. It is listed at 3.78kg and is supplied as a dry clutch starter, which helps when comparing against the unit already fitted to the machine or engine.

This part is identified as OEX part number DXS637 and is described as suitable for Denso applications. The listing also notes that it has an extra lead and plug fitted to the motor terminal as a heavy duty version, which is a useful detail when checking against the existing starter arrangement.

Key Features

• 12V starter motor
• 9 tooth pinion
• Clockwise rotation
• 1kW power rating
• 2 hole starter mount
• Denso style application

Specifications

• Brand: OEX
• Part No.: DXS637
• Product type: Starter Motor
• Voltage: 12V
• Number of teeth: 9
• Rotation: CW
• Power rating: 1kW
• New / Reman.: New

Verified fitment applications

• Hitachi EX40U
• Hitachi EX50U
• Iseki SF310
• Iseki TG5330
• Iseki TM3265
• Iseki TM3267 HST
• Isuzu 3LB1
• Isuzu 3LD1

Application and Buying Notes

When replacing a starter motor, match the part number, voltage, rotation, tooth count and mounting pattern before ordering. For this OEX unit, the key identifiers are DXS637, 12V, 9 tooth, CW rotation and the 2 hole mount with 120mm mount centres.

The Denso style application and the note about the extra lead and plug fitted to the motor terminal are important compatibility points. The heavy duty version is specifically noted as different from DXS436, which is listed as a 2.0kW unit with no extra lead, so the terminal arrangement should be checked carefully against the vehicle or equipment already installed.

The listed dimensions also matter in tight engine bays and equipment housings. Overall length is 190mm, flange diameter is 95mm, mount hole diameter is 13mm and the pinion diameter is 32mm, so comparing these measurements with the removed starter can help avoid a mismatch even when the application name looks close.

Before supply, the safest approach is to confirm the original unit details against the listed part number, voltage, output rating, mounting arrangement, and pulley configuration. That checking process is standard practice in the parts trade because visually similar units can still differ in service-critical ways.

For workshop, fleet, and equipment applications, accurate identification of part number DXS637 helps avoid unnecessary freight, additional labour, and vehicle or machine downtime. Where the application is not straightforward, the original unit, OEM reference, or workshop records should be used as the primary confirmation point.

Relevant published details for this unit include Type STARTER MOTOR, Unit of Measure EACH, Warranty One Year, Mount Centres A 120mm, Number of Teeth 9, Pinion at Rest 22mm, Power Rating 1kW, Suits Unit Make Denso, Note Has extra lead & plug fitted to Motor terminal H/Duty Version DXS436 (2.0kW has NO extra lead), Starter Mount Type 2 Hole.

Additional published details for cross-checking include Weight 3.78kg, Product Group 1 ROTATING ELECTRICAL, Part No. DXS637, Brand OEX, Description OEX Starter Motor 12V 9Th CW Denso Style, Flange Diameter 95mm, Mount Hole Diameter 13, Overall Length 190mm, Pinion Diameter 32mm, Rotation CW.

OEX Starter Motor 12V 9Th CW Denso Style. Part number DXS637 should be checked first. Listed voltage is 12. These details form the core reference points used by parts interpreters when confirming the correct replacement.

For part number DXS637, the normal identification sequence is part number, electrical rating, mounting arrangement, connector or terminal style, and pulley or drive details. Using those checkpoints helps confirm that the listed unit matches the service requirement rather than only looking similar.

For a starter motor in workshop, fleet, trade, agricultural, or construction service, the listed voltage 12 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include HITACHI EX40U, HITACHI EX40U 1998, HITACHI EX40U 1999, HITACHI EX40U 2000, ISEKI SF310, ISEKI SF310 2014. Even with application listings, final confirmation should still be based on the exact unit being replaced and the service requirements of the vehicle or machine.

The listed warranty is One Year. Warranty terms should be considered alongside correct application and part identification, as warranty does not replace fitment confirmation.

Compatibility note: Confirm fitment using the DXS637 part number, 12V CW 9 tooth specification, 2 hole mounting details and the application listed for your machine or engine before purchase. If the existing starter differs in terminal arrangement, lead configuration, mount centres or pinion dimensions, recheck carefully against the unit already fitted.

FAQ

What is the part number for this starter motor?

The OEX part number is DXS637. For this listing, part number DXS637 is the main reference point. Listed voltage is 12. Published fitment references include HITACHI EX40U, HITACHI EX40U 1998, HITACHI EX40U 1999. These details should still be checked against the original unit before ordering.

Is this starter motor 12 volt?

Yes. The listed voltage is 12V. For this listing, part number DXS637 is the main reference point. Listed voltage is 12. Published fitment references include HITACHI EX40U, HITACHI EX40U 1998, HITACHI EX40U 1999. These details should still be checked against the original unit before ordering.

What rotation does this starter use?

It is clockwise rotation, shown as CW. For this listing, part number DXS637 is the main reference point. Listed voltage is 12. Published fitment references include HITACHI EX40U, HITACHI EX40U 1998, HITACHI EX40U 1999. These details should still be checked against the original unit before ordering.

How many teeth does the pinion have?

The pinion has 9 teeth. For this listing, part number DXS637 is the main reference point. Listed voltage is 12. Published fitment references include HITACHI EX40U, HITACHI EX40U 1998, HITACHI EX40U 1999. These details should still be checked against the original unit before ordering.

What mounting style does it use?

It uses a 2 hole starter mount with 120mm mount centres. For this listing, part number DXS637 is the main reference point. Listed voltage is 12. Published fitment references include HITACHI EX40U, HITACHI EX40U 1998, HITACHI EX40U 1999. These details should still be checked against the original unit before ordering.

Which applications are listed for this starter?

Listed applications include Hitachi EX40U and EX50U, Iseki SF310, TG5330, TM3265 and TM3267 HST, Isuzu 3LB1 and 3LD1, Massey Ferguson 1250, and Shibaura 20JX and 30JX. For this listing, part number DXS637 is the main reference point. Listed voltage is 12. Published fitment references include HITACHI EX40U, HITACHI EX40U 1998, HITACHI EX40U 1999. These details should still be checked against the original unit before ordering.