TM 10-4610-232-12
REPAIR.
a. Repair all unserviceable components by replacement.
b. Repair leaks at pipe threads using two wraps of antiseize tape on male fittings.
c. Repair leaks around nuts (44 and 56) by tightening nuts. If that does not work, replace gaskets (49 and 57).
d. Repair leaks into wire shrink tubing (54) by applying antiseize tape on all threaded fittings. Also, fill bottom hole in
fitting (58) with silicone sealant.
e. Replace inlet strainer (38) if plugged.
f. Replace damaged or inoperative level switch (60).
TEST.
NOTE
If level switch assembly must be replaced, proceed with test procedure. If the original
switch is being used, proceed to reassembly.
a. Hold switch (60) with clip pointing upward and wires (53) pointing downward as shown in Figure 4-44.
b. Refer to the inset on Figure 4-44 and find letters P/L on float (63), P/L must be at clip end of shaft (64). If not,
remove clip (62), and reposition float (63) on shaft (64) with P/L clip end. Reinstall clip (62).
c. Attach a multimeter set to ohms x 1 to the black wire (53) and either one of the other two wires (53).
d. Check for continuity between the two wires while holding the switch (60) with the wires pointing down and the
float bottomed out on the switch shaft, If the circuit is open, attach the multimeter to the other colored wire.
e. The black wire is No. 324. Attach a wire label (para. 4-10).
f. When the meter shows continuity, the other tested wire is No. 342 and the third wire is No. 341. Attach wire labels
(para. 4-10).
g. Check the operation of the switch as follows:
(1) Wires down/float down . . . . . . . . . . . . . . . . . . . . . . . . . . .
324 to 342 = continuity; 324 to 341 = open circuit
(2) Wires down/float up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
324 to 342 = open circuit; 324 to 341 = continuity
NOTE
Tighten all connections without using excessive force on plastic fittings.
REASSEMBLY.
a. Put antiseize tape on level switch (60) and bushing (59) threads. Install switch (60) into bushing (59) and install this
assembly into bulkhead fitting (58).
b. Fill the bore of fitting (58) with silicone sealant.
c. Install gasket (57) unfitting (58) and install items (57 thru 60) in the tank as an assembly, with wires (53) protruding
through the bottom of the tank.
d. Install nut (56) over wires (53) and install body (55) in fitting (58). Tighten nut (56) securely to prevent leaks
NOTE
Proceed with step e only if new switch or new shrink wrap tubing are being installed.
Otherwise, proceed with step f.
e. Install new shrink tubing (54) on wires (53) as follows:
4-175
