TM 3-1040-263-34
a. Position fork (12) and wedge (11) to
properly will result in lost power transfer
crankshaft (13) with F identification marks on both parts
from the engine to the compressor.
facing front end of crankshaft. Use an arbor press, and
install roll pins (10) through fork (12) and wedge (11) with
c. Secure in place using four bolts (5), eight
outer slots oriented 180 apart and inner pin slots
flat washers (3 and 4), lockwashers (2), and nuts (1).
oriented 180 from outer pin slots. The keystone
d. Apply a torque of 7.5 to 9 pound-feet to the
assembly (14) must rotate smoothly on crankshaft (13)
four nuts (1).
after assembly is complete. If keystone assembly (14)
binds on crankshaft (13), loosen it by tapping with a
plastic or rawhide mallet.
4-37.
Final Installation
CAUTION
a.
Install aftercooler bracket and elbow (para
P17).
Do not allow ends of lockwire to extend
b.
Install oil sump (para 4-25).
beyond edges of counterweight (9).
b. Position counterweight (9) to crankshaft
c.
Install oil pump (para 4-21a through q).
(13), and secure in place using screw (7), lockwasher
d. Install compressor first stage(para 4-27d(1)
(8), and lockwire (6).
through (25)).
CAUTION
e. Install compressor second stage (para 4-
28d(1) through (24)).
During
rear
bearing
assembly
procedure, do not exert pressure on any
f.
Install compressor third stage (para 4-
portion of the crankcase.
29d(1) through (29)).
c. Position crankshaft (13) into the crankcase
g.
Install remaining components (para 4-
(17) through the first-stage opening so that the rear end
27d(26)).
of the crankshaft is oriented to rear of crankcase. Press
rear bearing (5) onto rear end of crankshaft (13) until
h.
Fill oil sump with oil (TM 3-1040-263-12).
hearing is shouldered, exerting pressure on inner race
with a bearing insertion ring (or equivalent) having a
i.
1.5003inch minimum ID.
Perform testing (para 4-38).
d. Handpress the rear bearing (5) into the
j.
Assemble protecting cage (para 3-7).
crankcase bearing interface area until flush with edge of
crankcase. Then, position spacer (4) into crankcase and
k. Perform 0 to 2, 000 psi tank fill operation
install retaining ring (3) into crankcase, bevel edge out.
(TM 3-1040-263-12).
e. Lubricate preformed packing (2), and soak
l.
Assemble canvas cover group (TM 3-1040-
seal (1) in compressor oil for one hour. Assembly
263-12).
preformed packing and seal in crankcase.
4-38.
Testing
4-36.
Crankcase Installation
a. Disconnect end nut on aftercooler (8, fig. 3-
a. Rotate engine pulley by hand until the
1) from water separator elbow (19).
engine crankshaft keyway (fig. 4-17) is directly at the
bottom.
b. Using the crankcase removal instructions
(para 4-32), remove compressor from engine.
b. Rotate compressor crankshaft until the hole
in the compressor crankshaft is directly at the top.
c.
Perform a four-hour break-in run (para 4-
41). d. Using the crankcase installation instructions
NOTE
(para 4-36), install compressor on engine.
The compressor must be assembled to
e. Connect end nut on aftercooler (8, fig. 3-1)
the engine with the compressor
to water separator elbow (19).
crankshaft hole (b above) 180 degrees
from the engine crankshaft keyway(a
above). Failure to mate the crankshafts
4-27
