TM 10-4610-215-24
TM 08580A-24/2
Table 3-1. Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
HIGH PRESSURE SWITCH – Continued
1. SWITCH WILL NOT ACTUATE (CUT OFF) AT 1250 psig (88 kg/cm2g- Continued
Step 2.
Using test lamp, check for switch actuation.
a. Adjust switch or bracket and tighten screw.
b. Replace defective sensing element assembly.
Step 3. Check to see that pressure sensing element is actuating switch.
Replace defective sensing element assembly.
2. SWITCH ACTUATES AT PRESSURE BELOW 1250 psig (88 kg/cm2g).
Step 1.
Refer to high-pressure switch malfunction 1, step 1.
LOW-PRESSURE SWITCH
1. SWITCH WILL NOT ACTUATE AT 10 psig (0.7 kg/cm2g).
Step 1. Apply pressure to switch and check actuation point with accurate gage and test light.
Step 2. Verify that adjustment screw is properly set to 10 psig (0.7 kg/cm2g).
a.
b.
c.
d.
e.
f.
Connect test light to N.O. and common terminals. Lamp should light at zero pressure.
Raise pressure until lamp goes off. Lamp should go off at proof (10 psig) (0.7 kg/cm2g
pressure.
Slowly decrease pressure until lamp lights. This is the set point.
Drop pressure to zero. Raise or lower setting adjustment screw in steps of not more than
one-quarter turn each step.
Repeat steps (b) and (c) until desired set point is reached.
Raise pressure to maximum, then decrease to 10 psig (0.7 kg/cm2g).
Step 3. Using test lamp, check for switch actuations.
a. Adjust switch bracket and tighten screw.
b. Replace defective sensing element assembly.
Step 4. Check to see that diaphragm is actuating switch.
Replace diaphragm.
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