D379, D398, D399 INDUSTRIAL & MARINE ENGINES Caterpillar


Mechanical Overspeed Shutoff

Usage:

Rotation is counterclockwise at half engine speed when seen from drive end.

(1) 4L1648 Spring for overspeed trip (900 to 1100 rpm engines):

Length under test force ... .969 in.(24.61 mm)

Test force ... 1.12 to 1.24 lb.(4.98 to 5.50 N)

Free length after test ... 1.172 in.(29.77 mm)

Outside diameter ... .406 in.(10.31 mm)

(1) 2L8705 Spring for overspeed trip (1200 to 1400 rpm engines):

Length under test force ... .969 in.(24.61 mm)

Test force ... 1.90 to 2.32 lb.(8.45 to 10.30 N)

Free length after test ... 1.25 in.(31.75 mm)

Outside diameter ... .406 in.(10.31 mm)

(2) 7L2116 Spring for release rod:

Length under test force ... 4.03 in.(102.4 mm)

Test force ... 45 lb.(200 N)

Free length after test ... 7.03 in.(178.6 mm)

Outside diameter ... .579 to .599 in.(14.71 to 15.22 mm)

Distance from face of adapter to center of yoke on linkage ... 2.25 in.(57.2 mm)

NOTE: One turn of weight adjustment screw changes setting 45 to 50 rpm.

Caterpillar Information System:

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