TM 3-4230-209-10
6
NOTE
Before applying the load, allow engine to warm up at idle RPM for 15
minutes. During operation in extreme cold temperatures (below 0F),
allow engine to warm up until it will maintain normal operation without
aid of manual CHOKE.
a. Adjust the THROTTLE to the desired pump speed. Increase the engine rpm
by rotating the throttle clockwise until TACHOMETER indicates
approximately 3,850 rpm.
NOTE
The governor on the engine is factory set to control the engine speed at
3,850 rpm. If the engine will not operate at 3,850 rpm, notify
organizational maintenance personnel to adjust the governor. Suitable
pressures to spray STB slurry properly, with two discharge hoses,
cannot be obtained unless the engine will operate at 3,850 rpm. At
that engine speed, the pump operates at 4,400 rpm.
b. At first the water PRESSURE GAGE may indicate zero and the VACUUM
GAGE may indicate from zero to fifteen inches of mercury depending on the
height of the pump above the level of water. When the pump is fully primed,
the sound of the pump will change noticeably and the water PRESSURE
GAGE should indicate between 60 and 120 psi. (90 psi is a normal reading.)
Change 2 2-67
