IMPORTANT:
The differential and maximum
pressure adjustment controls are located on the side of
the pressure switch with the pressure gauge. Upper ad-
justment control sets maximum pressure, and lowerad-
justment control is the differential setting for the lower
and upper range limits. The lower adjustment control
changes the range limits with regard to maximum
pressure setting. Reducing the differential setting nar-
rows the range limits which can cause the upper limit
(maximum pressure adjustment setting) to decrease
below specification value and lower limit to increase
above specification value; likewise, increasing the dif-
ferential setting expands the range limits which can
cause the upper limit (maximum pressure adjustment
setting) to increase above specification value. It may be
necessary to adjust the differential and maximum
pressure adjustment controls several times to set range
limits to specified values of 950 psi (6550 kPa) and
1250 psi (8618 kPa,J.
3. Adjust differential and maximum pressure con-
trols as necessary. Rotating upper control (max-
imum pressure adjustment) clockwise increases
pressure and counterclockwise decreases
pressure. Rotating lower control (differential
pressure adjustment) clockwise narrows the
range limits and counterclockwise expands the
range limits.
4.
Repeat Steps 2 and 3 to make fine pressure
switch adjustments for obtaining proper setting
of pressure range limits.
5.
Reinstall front cover on turntable chassis.
Figure 4
-
9. Location And Components Of Pressure Switch
Pressure
Switch
Mounting
Maximum Pressure
Base
Pressure
Adjustment Control
Gauge
TA•120 273
OM-890 Page 20
