TM 5-4310-343-35
(d) Install supports (41), and cap (14).
(e) Load Test. Load output shaft with 52.25 pound-inc hes of torque. Apply 27 volts DC to terminals of
motor. The motor must draw no more than 125 amperes, and its speed must be 3, 600 (5 percent) RPM.
g. Basic Compressor
(1) Reassembly of the basic compressor is essentially the reverse of disassembly. Be sure that all parts are
clean prior to reassembling them. Should interruptions occur during assembly, cover all parts to prevent contamination.
Apply lubricating oil and pneumatic grease to parts as required. Refer to figure 6-6 and reassemble basic compressor as
follows:
(a) Assemble the adjustable holding fixture Part Number 871981 or equivalent to the crankcase mounting
flange; then, assemble the adjustable holding fixture to a Model 303 Hydraulic Power Arm vise or equivalent.
(b) Assemble wedge (23) and the fork (25) to crankshaft (36) with spring pins (24). The wedge and fork
making up the cam assembly are selective fits and are not interchangeable. Check identification marks stamped on the
parts to indicate match. The slots in each pin (24) should be 180 apart. Using an arbor press and punch Part Number
256994 or equivalent install the pins so that slots in outer pins face away from each other. Check that cam assembly
rotates freely on crankshaft. Binding may be loosened by tapping cam and shaft with a plastic or rawhide mallet.
(c) Insert assembled cam and crankshaft assembly into crankcase (43) through first stage cylinder bore
toward rear bearing hole. Assemble rear bearing (42) into position by pressing on race until flush with bearing retainer.
While supporting rear bearing on its inner race, press crankshaft to rear until its shoulder contacts the bearing. Press in
forward bearing (30), pressing on both inner and outer races until bearing contacts the shaft shoulder.
Insert front
preformed packing (31) rear preformed packing (41), oil seal (40), and seal retainer (39). Press the seal to the shoulder in
retainer, then install the bevel ring (38).
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