D379, D398, D399 INDUSTRIAL & MARINE ENGINES Caterpillar


Hydramechanical Shut-Off 3N5760, 5N1978, 5N5993 & 5N5994

Usage:

(1) Overspeed adjustment bolt.

(2) 3N5747 Spring; Overspeed (1001 thru 1300 rpm) for 3N5760 and 5N5994 Units:

Length under test force ... .663 in.(16.84 mm)

Test force ... 3.50 lb.(15.60 N)

Free length after test ... .955 in.(24.26 mm)

Outside diameter ... .426 in.(10.82 mm)

(2) 3N8402 Spring; Overspeed (900 thru 1000 rpm) for 5N1978 and 5N5993 Units:

Length under test force ... .663 in.(16.84 mm)

Test force ... 1.59 lb.(7.05 N)

Free length after test ... 1.457 in.(37.01 mm)

Outside diameter ... .415 in.(10.54 mm)

(3) 3N5751 Spring; Speeder (1001 thru 1300 rpm) for 3N5760 and 5N5994 Units:

Length under test force ... 1.504 in.(38.20 mm)

Test force ... 3.19 lb.(14.25 N)

Free length after test ... 1.771 in.(44.98 mm)

Outside diameter ... 1.378 in.(35.00 mm)

(3) 3N8403 Spring; Speeder (900 thru 1000 rpm) for 5N1978 and 5N5993 Units:

Length under test force ... 1.504 in.(38.20 mm)

Test force ... 1.40 lb.(6.25 N)

Free length after test ... 1.621 in.(41.17 mm)

Outside diameter ... 1.378 in.(35.00 mm)

(4) Dimension from end of speed sensing valve to the seat ... 4.615 ± .010 in.(117.22 ± 0.25 mm)

(5) Thickness of oil pump rotors ... .3745 ± .0005 in.(9.512 ± 0.013 mm)

Depth of counterbore ... 3760 +.0005 -.0000 in.(9.550 +0.013 -0.000 mm)

(6) Diameter of shaft ... .6235 ± .0005 in.(15.837 ± 0.013 mm)

Diameter of bore in housing ... .6255 ± .0005 in.(15.888 ± 0.013 mm)

(7) 4L9971 Spring for oil pump relief valve (3N5760 and 5N1978 Units):

Length under test force ... 1.624 in.(41.25 mm)

Test force ... 29.2 lb.(130 N)

Free length after test ... 2.08 in.(51.0 mm)

Outside diameter ... .415 in.(10.54 mm)

(7) 5N6449 Spring for oil pump relief valve (5N5993 and 5N5994 Units):

Length under test force ... 1.624 in.(41.25 mm)

Test force ... 51 lb.(225 N)

Free length after test ... 2.101 in.(53.37 mm)

Outside diameter ... .417 in.(10.59 mm)

(8) Speeder spring adjustment bolt.

(9) Install shaft so end is even with side of housing.

(10) 5N5204 Spring for interface valve (3N5760 and 5N1978 Units):

Length under test force ... 1.005 in.(25.53 mm)

Test force ... 9.67 lb.(43.0 N)

Free length after test ... 1.75 in.(44.5 mm)

Outside diameter ... .350 in.(8.89 mm)

NOTE: 5N5993 and 5N5994 Units do not have an interface valve.

(11) 3N5757 Spring for selector valve:

Length under test force ... 1.004 in.(25.50 mm)

Test force ... 2.20 lb.(9.8 N)

Free length after test ... 1.48 in.(37.59 mm)

Outside diameter ... .347 in.(8.81 mm)

(12) 3N5738 Spring for low range oil pressure valve:

Length under test force ... 1.188 in.(30.18 mm)

Test force ... 8.79 lb.(39.1 N)

Free length after test ... 2.62 in.(66.55 mm)

Outside diameter ... .497 in.(12.62 mm)

(13) 5N2723 Spring for high range oil pressure valve:

Length under test force ... 1.750 in.(44.45 mm)

Test force ... 15.5 lb.(69 N)

Free length after test ... 4.39 in.(111.5 mm)

Outside diameter ... .472 in.(11.99 mm)

(14) 5N6096 Spring for manual valve:

Length under test force ... 1.004 in.(25.50 mm)

Test force ... 4.4 lb.(19.6 N)

Free length after test ... 1.920 in.(48.77 mm)

Outside diameter ... .544 in.(13.82 mm)

(15) 5N4748 Rack Circuit Sequence Valve for 3N5760 and 5N1978 Units:

Tighten valve to a torque of ... 43 ± 3 lb. ft.(59 ± 4 N·m)

Set valve to bypass at ... 65 ± 2 psi(450 ± 14 kPa)

(15) 5N5755 Rack Circuit Sequence Valve for 5N5993 and 5N5994 Units:

Tighten valve to a torque of ... 43 ± 3 lb. ft.(59 ± 4 N·m)

Set valve to bypass at ... 110 ± 3 psi(760 ± 20 kPa)

(16) 8H8731 Spring for pilot valve:

Length under test force ... .703 in.(17.86 mm)

Test force ... .95 lb.(4.3 N)

Free length after test ... .875 in.(22.23 mm)

Outside diameter ... .234 in.(5.94 mm)

(17) 5N4749 Air Inlet Circuit Sequence Valve:

Tighten valve to a torque of ... 43 ± 3 lb. ft.(59 ± 4 N·m)

Set valve to bypass at ... 15 ± 2 psi(105 ± 14 kPa)

Caterpillar Information System:

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