3406 INDUSTRIAL & MARINE ENGINES Caterpillar

Adjust nut (3) so that when the inlet air pressure increases to 10 psi (70 kPa) the plunger will start to move.

Range of operation ... 10 to 80 psi(70 to 550 kPa)

(1) 7F9958 Spring:

Free length ... 6.19 ± .02 in.(157.2 ± 0.5 mm)

Outside diameter ... 3.88 ± .02 in.(98.6 ± 0.5 mm)

Test force ... 100 lb.(445 N)

Length under test force ... 5.75 ± .02 in.(146.1 ± 0.5 mm)

(2) 2N6005 Spring:

Free length ... 4.91 ± .02 in.(124.7 ± 0.5 mm)

Outside diameter ... .860 ± .010 in.(21.84 ± 0.25 mm)