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Bobcat 6691621 Starter Motor Assembly

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Rated Voltage	12V
Rated Power	1.2 kW
Pinion Teeth	9
Rotation Direction	Clockwise (CW)
Mounting Holes	2
Mounting Flange Diameter	66 mm
Engine Displacement	719 cc
Cylinders	3
Weight	3.63 kg
Package Dimensions	23 × 15 × 15 cm

Manufacturer No.

428000-5840
4280005840
228000-0991

OEM Part No.

6691621
5002731
6688372

Engine Part No.

Kubota D722

Interchange No.

940.507 092.050
LRS03947
STR70491
111021
25-35465-00
Airstal
AD Kühner

Fitment Vehicles

Bobcat 418
Bobcat E08
Bobcat E10
Bobcat E10z
Bobcat E17
Bobcat E17z
Bobcat E19
Bobcat E20
Bobcat E20z
Bobcat E26
Bobcat E27z
Bobcat 319
Bobcat 321
Bobcat 323
Bobcat 324
Bobcat E14
Bobcat E16
Doosan DX10Z
Doosan DX19

The 6691621 starter motor is a 12-volt, 1.2-kilowatt unit designed for Kubota D722 engines installed in Bobcat and Doosan compact excavators. It utilizes an offset gear reduction (OSGR) mechanism with a 9-tooth pinion rotating clockwise. The mounting flange diameter is 66 millimeters with a two-hole bolt pattern. The integrated solenoid ensures reliable engagement under cold and hot weather conditions. The housing is constructed from aluminum alloy with a steel drive gear for durability in construction environments.

This assembly replaces Bobcat OEM part numbers 6691621, 5002731, and 6688372. It cross-references to Denso manufacturer numbers 428000-5840 and 228000-0991. Compatible equipment includes Bobcat 418, E08, E10, E10z, E17, E17z, E19, E20, E20z, E26, E27z, 319, 321, 323, 324, E14, E16 and Doosan DX10Z, DX19 mini excavators.