two coats of rust-inhibiting semigloss enamel,
Military Specification MIL-C-15328. Allow it
to dry thoroughly before applying the final coat
Federal Specification TTE-485. After apply-
of paint.
b. Final Coat.
22. Pressure Low or Falling
21. General
Possible remedy
Probable cause
Each trouble symptom is followed by a list
Tighten bolts or replace
Gaskets not seated
of probable causes of the trouble. The possible
worn gaskets
properly.
remedy is described opposite the probable cause.
R e p l a c e preformed packing
Preformed packing
defective.
Hose connections leak ---- Tighten connections
Section IV. REPLACEMENT OF WORN PARTS
(3). Lift off the spring shield and
23. Repair of Hand Pump
pull-back spring (5). Unscrew and
a. General. Repair of the pump is limited to
remove the up-stop bushing (4). Re-
replacement of the preformed packings. The
move the low pressure plunger from
preformed packing is positioned around the
the pump chamber (1). Remove the
stem of the pressure release control lever.
worn preformed packing (11) from
Packing is positioned between the pump cham-
the groove in the low pressure
ber and the low pressure plunger. Packing is
plunger, and discard.
also positioned between the packing gland and
(3) P a c k i n g gland and high pressure
the high pressure plunger.
plunger packing. Remove the cotter
b. Removal of Preformed Packings. R e -
pin ((8), fig. 15) that retains the pin
moval of the preformed packings are discussed
(7) connecting the pump lever socket
separately in paragraphs (1) through (3) be-
to the link (2) and remove the pin.
low :
Pull the pump lever socket with the
(1) Pressure release control lever pre-
high pressure plunger (6) attached
formed packing. Remove the pres-
out of the packing gland retainer (5).
sure release control lever ((3), fig. 13)
Unscrew the packing gland retainer
as an assembly from the pump cham-
from the low pressure plunger. Lift
ber (1) by turning the pressure re-
off the spring shield and pull-back
lease control lever handle in a coun-
s p r i n g (4). Remove the worn pre-
terclockwise direction until it is free
formed packing (3) from inside the
of the pump chamber. Remove the
low pressure plunger, and discard.
worn preformed packing (2) from the
c. Installation of Preformed Packings. In-
groove around the pressure release
stallation of the preformed packings discussed
control lever stem, and discard.
separately in (1) through (3) below:
(2) P u m p chamber and low pressure
(1) Pressure release control lever pre-
plunger packing. Remove the cotter
formed packing. Install a new pre-
pin ((9), fig. 14) that retains the pin
formed packing 1/2- by 3/8- by 1/16-
(8) connecting the pump lever socket
in.) in the groove of the pressure re-
(7) to the link (2) and remove the
lease control lever stem. Screw the
pin. Pull the pump lever socket with
pressure release control lever as a unit
the high pressure plunger (10) at-
into the pump chamber in a clockwise
tached out of the packing gland re-
direction until it bottoms.
(2) P a c k i n g gland and high pressure
t a i n e r (6). Unscrew the packing
plunger packing. Place a new pre-
gland from the low pressure plunger
AGO 8359A
24
