TM 3-1040-263-34
into preassembled discharge valve, valve plate, and
washers (3) and holding brackets (5, 6, and 7). Apply
head assembly. Then, position preassembled head
specified torque (par, 1 1-4b).
assembly on third-stage cylinder and plunger assembly
(31) Install fan group (para 4-7).
(25), orienting head assembly inlet port toward the front
(32) Perform testing (e below).
or fan end of the compressor (fig. 4-9).
(33) Install protecting cage (para 3-7).
(22) Secure
positioned
parts,
using
(34) Perform G to 2,000 psi tank-fill
lockwashers (4, fig. 4-12) and screws (3).
operation (TM 3-1040-263--12).
(23) Tighten screws (3) handtight.
(35) Install canvas cover (TM 3-1040-263-
(24) Install second-stage relief valve (2).
12).
e. Testing.
(25) Install elbow (1).
(26)Remove screw (3) and washer (4), and
(1) Disconnect aftercooler end nut (8, fig.
position aftercooler-attached bracket (6) to third-stage
3-1) from water separator elbow (19).
head (17). Reassemble removed washer (4) and screw
(2) Using
the
crankcase
removal
(3).
instructions (para 4-32), remove compressor from
(27) Position aftercooler (fig. 3-3). Tighten
engine.
-aftercooler end nuts (para 1-4).
(3) Perform twelve-hour break-in run (para
(28) Remove screw (3, fig. 4-12) and
f.
Installation.
washer (4), and position third-stage heat exchanger,
second-stage heat exchanger (fig. 3-3), and attached
(1) Using the crankcase installation
bracket (5, fig. 412). Tighten heat exchanger end nuts
instructions (para 4-36), install the compressor on the
engine.
(29) Attach washers (4), screws (3) and
(2) Connect end nut on the aftercooler (8,
holding brackets (5). Apply specified torque (para 1-4b).
fig. 3-1) to the water separator elbow (19).
(30) Attach studs (4, fig. 4-6), nuts (2),
Section VIII. KEYSTONE, CRANKSHAFT, AND CRANKCASE
4-30. General
b. Remove crankcase (6).
General support maintenance personnel are authorized
c. Remove gasket (7) from adapter and
to replace the seal, bearing, counterweight, rool pin,
wedge, fork, crankshaft, and hardware.
gasoline engine.
4-31.
Preliminary
4-33.
Disassembly
a.
Remove compressor first stage (para 4-27).
a
Remove and discard the seal (1, fig. 4-16)
b.
Remove compressor second stage (para 4-
and preformed packing (2) from the rear of the
28).
compressor crankcase.
c.
Remove compressor third stage (para 4-29).
b. Remove the retaining ring (3) and spacer
d.
Remove oil sump (para 4-23).
(4) to permit movement of the crankshaft (13).
e.
Remove oil pump (para 4-19).
f.
Remove aftercooler bracket and elbow
CAUTION
(para 417).
Exercise care to prevent damage to crankcase (17),
4-32.
Removal
crankshaft (13), and rear bearing (5) during bearing
removal operation.
a
Remove the four nuts (1, fig. 4-15),
c. Position the compressor crankcase with
lockwashers (2), eight flat washers (3 and 4), and four
rear of crankcase down and crankshaft (13) suspended
bolts (5).
upward on an arbor press. Then, position two 1/8-inch
diameter by 3 3/4-inch long metal pins, 180 apart, onto
the rear bearing (5) inner
4-24
