TM 10-4320-303-13
4.8.2 Special Instructions. Preventive maintenance is not limited to performing only those checks and
services listed in the PMCS Table. Covering unused receptacles, stowing unused accessories, and other
routine procedures such as equipment inventory, cleaning components, and touch-up painting are not listed in
the table. These are things you should do any time you see that they need to be done. If a routine check is
listed in the PMCS Table, it is because experience has shown that problems may occur with this item. Take
along tools and cleaning cloths needed to perform the required checks and services.
Table 4-6. Unit Maintenance Preventive Maintenance Checks and Services.
Location
Item
No.
Interval
Item to
Check/Service
Procedure
Not Fully
Mission Capable
if:
Hypochlorination
Unit 1955-1
1
Weekly
Strainer Assembly
Refer to paragraph
Strainer is
4.13.4. and service
damaged or
strainer assembly.
corroded.
Inspect for corrosion
or damage.
SECTION IV. UNIT TROUBLESHOOTING
4.9 TROUBLESHOOTING .
The malfunction index lists faults that may be observed by unit maintenance personnel. The faults are then
cross-referenced to the troubleshooting table, Table 4-7. Table 4-7 contains information useful in diagnosing
and correcting unsatisfactory conditions which may be encountered during operation or maintenance of the
TWDS. Use the malfunction index to locate specific troubleshooting procedures contained in Table 4-7. After
locating the troubleshooting procedure, perform the test/inspections and corrective actions in the order listed.
The malfunction index and Table 4-7 cannot list all of the malfunctions that may occur, all tests and inspections
needed to find the fault, or all the corrective actions needed to correct the fault. If the equipment malfunction is
not listed or actions listed do not correct the fault, notify your supervisor. Refer to the applicable technical
manuals for 125 GPM and 600 GPM Pumping Assemblies, Hypochlorination Units, and for 20,000 Gallon
Pillow Tank unit troubleshooting procedures.
UNIT MALFUNCTION INDEX
Malfunction Number
in Table 4-7
20,000 Gallon Pillow Tank is not being filled.............................................................................
1
Pressure-reducing valve assembly will not open or will not
close drip-tight..........................................................................................................................
2
Hypochlorination unit, model 1955-1 pressure gauge shows
high pressure............................................................................................................................
3
Hypochlorination unit, model 1955-1 camshaft is turning but
spring is not moving..................................................................................................................
4
Little or no water flow at distribution points................................................................................
5
4-10
