Prestolite Alternator 24V 200A 4740JB

The Prestolite Alternator 24V 200A, part number 4740JB, is a new alternator built for 24-volt charging systems that need a 200 amp output. It is a twin leg mount unit with an internal regulator, clockwise rotation, and a shaft diameter of 22mm.

This unit is listed as a Prestolite series 4000 alternator and carries a one year warranty. Key mounting details include 101mm inside mounting legs, 216mm mount centre to centre, a 1/2 UNC adjusting hole diameter, and a 13mm pivot hole diameter.

The alternator is supplied as each and weighs 14.44kg. It uses self excitation, high temperature grease and seals for longer bearing life, and a fan design intended to improve air flow and support cooler operation under high output load conditions.

Key Features

• 24V alternator with 200A power rating
• Internal regulator
• Twin leg alternator mount
• New unit, not remanufactured
• Self excitation
• High temperature grease and seals for bearing life

Specifications

• Brand: Prestolite
• Part No.: 4740JB
• Series: 4000
• Voltage: 24V
• Power rating: 200A
• Mount type: Twin leg
• Inside mounting legs: 101mm
• Mount centre to centre: 216mm

Fitment guidance

• Supported fitment families include Atlas Copco, Bertram, Caterpillar, Cummins, Doosan/Daewoo, Mack, Princess, Riviera, Terex O&K, and Timberking.
• Sample applications listed include Atlas Copco MT5020 and MT6020, Bertram 570 and 670, Caterpillar 120G, 120H, 12G, 12H, 130G, 140G, 140H-LL, 143H, 14G, 14H, 14H-LL, and 14M.
• Other listed applications include Cummins L10, Doosan/Daewoo Solar 330LC-V, Mack Qantum, Princess V58, Riviera 60 and 70, Terex O&K MT3700AC, MT4400, MT4400AC, MT5500, MT5500AC, RH120E, RH120EBH, RH120EFS, RH340B, RH340BH, RH340FS, and RH400, plus Timberking TK722A.

Application and Buying Notes

Before ordering, check the part number 4740JB against the existing alternator or parts catalogue, and confirm the vehicle or machine uses a 24V charging system with a 200A alternator. The mount style is twin leg, so the 101mm inside mounting legs and 216mm mount centre to centre need to line up with the application.

The pulley section is listed as not applicable, so the unit should be matched on the mounting, shaft, rotation, and electrical specification rather than pulley section. The shaft diameter is 22mm, the rotation is clockwise, and the regulator is internal, which are important details when comparing to the fitted unit.

This alternator is a new Prestolite unit and not a remanufactured item. For buyers replacing an existing unit, the practical checks are voltage, amperage, mounting leg spacing, pivot and adjusting hole sizes, shaft diameter, and the fitted application list where available.

If you are working from a machine model rather than a part number, compare the listed application carefully with the exact machine variant. Even within the same make and series, alternators can differ by mount style, rotation, regulation, and shaft size, so matching on measurements remains important.

The one year warranty applies to this alternator as supplied, but warranty coverage does not replace the need to confirm fitment before installation. If the existing unit is damaged or missing, confirm the machine’s electrical system requirements and mount dimensions before you buy.

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 4740JB 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 ALTERNATOR, Unit of Measure EACH, Warranty One Year, Inside Mounting Legs 101mm, Power Rating (Amp) 200, Regulator Type Internal, Series 4000, Suits Unit Make Prestolite, Alternator Mount Twin Leg, New / Reman. New.

Additional published details for cross-checking include Shaft Dimension 22, Product Group 2 ALTERNATORS, Part No. 4740JB, Brand PRESTOLITE, Description Prestolite Alternator 24V 200A, Adjusting Hole Diameter 1/2 UNC, Pivot Hole Diameter 13, Pulley Section Not Applicable, Rotation CW.

Prestolite Alternator 24V 200A. Part number 4740JB should be checked first. Listed voltage is 24. Listed output rating is 200. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Twin Leg. Regulator type is Internal. Pulley configuration is Not Applicable. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number 4740JB, 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 alternator in workshop, fleet, trade, agricultural, or construction service, the listed voltage 24 and output 200 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include ATLAS COPCO MT5020, ATLAS COPCO MT6020, BERTRAM 570, BERTRAM 670, CATERPILLAR 120G, CATERPILLAR 120H. 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.

Compatibility note: Please confirm compatibility by checking part number 4740JB, 24V system voltage, 200A output, twin leg mounting, 101mm inside mounting legs, 216mm mount centre to centre, 22mm shaft diameter, and clockwise rotation against the unit being replaced.

FAQ

Is this a new or remanufactured alternator?

It is listed as new, not remanufactured.

What voltage and output does this alternator have?

It is a 24V alternator with a 200A power rating.

What is the part number?

The part number is 4740JB.

What type of regulator does it use?

It has an internal regulator.

What mount style does it use?

It uses a twin leg alternator mount with 101mm inside mounting legs and 216mm mount centre to centre.

What vehicles or machines is it listed against?

Listed applications include Atlas Copco, Bertram, Caterpillar, Cummins, Doosan/Daewoo, Mack, Princess, Riviera, Terex O&K, and Timberking, with specific models shown in the fitment guidance.