TM 5-3810-289-34
necessary.
spacer; pack sleeve half full with GAA, wheel bearing
(c) Pull swing and propel friction clutch
grease. See figure 4-17.
housing with the swing gear in place, using a pinch bar
(h) Tap outer bearing into place with shield
and wood block to bump it along. The left hand bearing
outermost.
will come with housing.
(i) Replace driver key and slide on clutch
(d) Remove right hand bearing which is a
assembly with wedge in split hub. Remove wedge and
light tapping fit, .
tighten bolt through split hub (driver key must not
(e) If desired, the swing gear may be
protrude from hub).
removed from housing but a 20- to 30-ton capacity press
(j) Tap right shaft bearing into right bearing
is required.
housing, shield side against shoulder.
(j) The hoist gear and left shaft bearing are
(k) Tap assembly of housing and bearing on
now the only remaining parts on the shaft. The hoist
shaft, open (or cover) side of housing outermost.
gear is a press fit on the shaft and a 20-to 30-ton press is
(1) Replace shaft retainer and lock with two
required to pull it.
wired capscrews. Pack half full with GAA grease.
(g) The left bearing can now be removed to
the left by pulling with the press or tapping off.
Caution: Do not damage oil seal on bearing.
(h) This completes disassembly operation to
the left.
e.
Inspection and Repair.
Clean all parts
thoroughly and inspect for damage and excessive wear.
For bearing and gear inspection and repair procedures,
see paragraph 2-8. Replace, or repair by welding, any
broken or cracked parts. Place shaft in V-blocks and
rotate using dial indicator to detect bent shaft Straighten
shaft in press or replace if bent. Check drums for
scoring, and if in bad condition, replace Check keys and
keyways for good condition and tight fit. Replace
damaged keys.
Note. The undercut tolerances for drums, clutches
and brakes is .090 inch on the radius.
f.
Assembly Preparatory to Installation on
Figure 4-17. Front drum shaft assembly (right side)
Machine.
(sheet 1 of 2).
(1)
General Assembly instructions are
presented in two sections: Assembly from the left,
assembly from the right. Either sequence may be taken
first.
(2) Assembly operation from the left.
(a) Refer to figure 4-11 under rear drum
shaft assembly and follow the assembly procedure for
the left side of the shaft.
(b) Reverse disassembly sequence shown
in figure 4-11.
(3) Assembly operations from the right.
(a)
Tap left bearing housing over left
bearing.
(b) Tap on left boom hoist drum bearing,
seating its shield side against shaft shoulder.
(c) Slide boom hoist drum into place and tap
it onto its left bearing, pack drum cavity half full with GAA
wheel bearing grease.
Figure 4-17. Front drum shaft assembly (right side)
(d) Tap right bearing with its shield towards
(sheet 2 of 2).
outer side of drum and into place in boom hoist drum.
(e) Insert key and slide boom hoist clutch
(m) Replace gasket being sure that it is in
with booster housing on it, into place on key. Booster
good condition.
housing must float free on driver hub. See figure 4-17.
(n) Replace right hand bearing cover and
(f) Slide on spacer.
fasten in place with two capscrews with lockwashers and
(g) Tap inner crowd clutch housing bearing
two countersunk head screws. Cover will only
into housing and slide crowd clutch housing with integral
drum onto shaft, seating hearing shield side against
4-20
