TM-9-2330-356-14

SEMITRAILER, TANK: 5000 GALLON, BULK HAUL, SELF LOAD/UNLOAD M967 AND M967A1; SEMITRAILER, TANK: 5000 GALLON, FUEL DISPENSING, AUTOMOTIVE M969 AND M969A1; SEMITRAILER, TANK: 5000 GALLON, FUEL DISPENSING, UNDER/OVERWING AIRCRAFT M970 AND M970A1

TECHNICAL MANUAL; OPERATOR’S, UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL

OCTOBER 1990

  TM-9-2330-356-14 - Page 435 of 528

TM 9-2330-356-14
Figure
8-3.
Installation of Mechanical Seal.
(8)
After adjustment for proper running
clearance is made, tighten impeller securely.
(9) If
wear plate (21, fig. 8-1) was removed, install
new wear plate in pump casing and fasten with two nuts
(25) and lockwashers (26).
(10) Put anew gasket (19) over studs (22) of volute.
Install seal plate assembly and intermediate housing
assembly (3). Check and adjust the clearance between the
impeller vanes and the wear plate (step e). Install
lockwashers (2) and nuts (1) and tighten securely.
(11) Install pipe plug (13, fig. 8-2). Refer to Section
I, Chapter 3, and fill the intermediate housing with the
proper lubricant.
g.
Installation.
Install pump and coupling
(para 5-22).
8-4.
Pump, 3-inch (M970 and M970A1)
a.
Air Leakage Test.
Perform preliminary test before
removing pump (para 8-3a).
b.
Removal.
Remove pump and coupling (para 5-22).
c.
Disassembly (Fig. 8-5).
(1)
Impeller (10) and Wear Ring (9).
For access to
the impeller, remove nuts (17) and lockwashers (16).
Carefully separate the intermediate housing and seal
plate as an assembly from the volute (7). Discard gasket
(11).
(a) To
remove
impeller
(10),
use
instructions in paragraph 8-3c.
(b)
The enclosed impeller uses a wear ring
(9) to keep internal pump leakage at a minimum. When
the clearance exceeds the limits shown in figure 8-4, the
impeller and/or wear ring must be replaced.
(c) To remove wear ring (9), use a suitable
puller.
Figure 8-4. Wear Limits of Impeller and Wear Ring.
(2)
Seal Plate and Mechanical Seal. The
arrangement for the mechanical seal is the same as the
4-inch pump. Use the following procedure to remove the
seal:
(a)
Remove pipe plug (34) on bottom of
intermediate housing and drain lubricant.
(b)
Remove impeller (10) using instructions
in paragraph 8-3c.
(c) Remove eight capscrews (28) and
lockwashers (27) and pull the seal plate (15) and
mechanical seal (14) from the impeller shaft as an
assembly.
8-5


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