TM 5-3810-294-34
install sufficient shims (18, 19, and 201 to provide above end-play.
on hub and sprocket (8). Install outer race of bearing (9)
j. Press seal (21) into bore of housing (14). All seals in this
in clutch housing (14). Prepack inner race of bearing (9)
assembly should be installed with their sealing lips pointing toward
with type GAA grease.
bevel pinion (4).
c. Stand hub (8) on end, sprocket end down.
k. Reinstall drum (22) using capscrews (23), with the measured
d. Install outer race of bearing (171 in clutch housing
amount of shims (18, 19, and 20) in place. Tighten capscrews (23)
(14).
to 20 to 25 foot-pounds.
e. Install clutch housing (14) on hub and sprocket
L Install lock ring 124), making sure the hole in the ring is
(8), being careful not to damage seal. (10). Pack area
located directly in line with grease fitting (15). Bearing (25) may not
between seal (10) and bearing (17) with type GAA
receive adequate lubrication if the lock ring is incorrectly installed.
grease. Warm and install inner race of bearing (91 over
m. Warm bearing (25) and install it firmly against lock ring (24).
outer diameter of hub and sprocket (81.
n. Install seal (26) in the bore of drum (22). Be sure seal seating
f. Install bearing (6) on shaft (7). Warm bearing, and
surface on spacer (28) is clean and free from nicks and burrs
apply force to the inner race only. Be sure bearing fits
because minor spacer imperfections can wear seal lips rapidly
firmly against the shaft shoulder.
Lubricate the seal with type GAA grease before installation.
g. Install shaft (7). and bearing (6) into hub and
o. Install O -ring (27) on spacer (28) and slide the assembly into
sprocket (8). Be sure bearing (6) fits firmly against the
position on shaft (7), being careful to avoid damage to seal (26)
shoulder in hub and sprocket (8).
This completes bench assembly of the horizontal swing shaft.
h. Install spacer (5) and bevel pinion (4) and secure
5-48. Installation
these items in place with washer (3), capscrews (2), and
Refer to paragraph 2-18 and install the horizontal swing shaft.
lock wire (1).
i. Assemble drum (22) on hub (8), using three
capscrews (23 , evenly spaced. Do not install shims (18,
19, and 20) at this time. Tighten the three capscrews to
20 to 25 foot-pounds, using a torque wrench. Check
shaft end-play, using a dial indicating micrometer. End-
play should be from 0.003 to 0.005 inch. Remove clutch
drum (22) an
Section IX. REPAIR OF SWING BRAKE SHAFT
5-50. Repair Procedures
549. Description
The swing brake shaft must be totally disassembled during
The swing brake shaft mates with the slewing ring (refer
removal. For that reason, repair is handled during removal and
to fig. 5-1). The swing brake is used prevent the crane
installation. Refer to paragraph 2-22 for swing brake shaft repair
(revolving frame) atom rotating when desired.
procedures.
Section X. REPAIR OF VERTICAL SWING SHAFT
5-51. Description
5-52. Repair Procedures
The vertical swing shaft is driven by the horizontal swing
The vertical swing shaft must be totally disassembled during
shaft. The shaft terminates in a pinion which mates with
removal. For that reason, repair is handled during removal and
the gear in the slewing rim (refer to fig. 5-1).
installation. Refer to paragraph 2-21 for vertical swing shaft repair
procedures.
5-27
