TM 9-2330-356-14
REPAIR OF PUMP, VALVES, AND DISPENSING EQUIPMENT
Section 1. GENERAL
Scope
warning may result in serious injury or death
to personnel.
This section contains procedures for disassembly,
cleaning, repair, and assembly of the pump, valves, and
Read and observe all safety precautions in the
a.
dispensing equipment which are beyond the scope of the
Warning Summary before beginning work.
using organization.
Drain all valves and piping in the area before
b.
8-2.
Precautions
attempting to remove or disassemble valves or system
components.
WARNING
c. Ground semitrailer to an approved (earth)
ground.
Read and observe all safety precautions in
Warning Summary before performing mainte-
The area must be rated safe.
d.
nance on pump, valves, and dispensing
equipment. Ensure that semitrailer is
e. Ensure that work area is kept clean. Cleanup any
grounded to an approved (earth) ground and
it is safe to proceed. Failure to follow this
fuel spills IMMEDIATELY.
Section II. CENTRIFUGAL PUMPS
Pump, 4-inch (M967, M967A1, M969, and
(5) If leakage is indicated, tighten flange
connections and repeat test before removing pump for
repairs.
Air Leakage Test. Before removal, the following
a.
b.
test can be performed to determine whether pump or a
loose connection is the cause of problem. Air leaks at the
c.
inlet of pump will cause noisy operation and decreased
(1) Remove pipe plug (30) on bottom of
pump outlet. A vacuum gage is needed for this test.
intermediate housing (3) and drain the lubricant.
(1) Remove a pipe plug (31) in the suction side of
the pump. Use pipe seal compound on the pipe threads.
Use a soft hammer to loosen the intermediate housing (3)
Install a vacuum gage in the plug.
and seal plate (15). Carefully remove the intermediate
housing, seal plate, and impeller (20) as an assembly from
volute (23). Discard gasket (19).
(2) Make sure the pump is filled with fluid, and
start the pump.
(3) The impeller (20) is threaded on the impeller
shaft (8). The impeller will unscrew in the same direction
(3) At operating speed, the pump should pull a
as the pump runs. To remove impeller:
minimum of 20-inches of vacuum. This indicates that the
(a) Put a strap wrench around discharge
gaskets and seals are good.
surface of the impeller as near as possible to the seal plate
(15).
(4) Stop the pump. Observe whether vacuum
remains at the maximum developed by the pump. If
(b) If pump coupling was removed earlier,
vacuum falls off rapidly, an air leak exists. Be sure that
temporarily install the pump coupling and wedge a pry bar
leakage is not coming from pipe plug or vacuum gage
between coupling and intermediate housing to hold the
impeller shaft.
connection.