Hitachi EX1900-5 Operator's Manual page 243

Loosen the Track
CAUTION: Do not loosen valve (1) quickly or
loosen it too much as high-pressure grease in the
adjusting cylinder may spout out. Loosen care-
fully, keeping body parts and face away from
valve (1).
Never loosen grease fitting (2).
IMPORTANT: When gravel or mud is packed between
sprockets and track links, remove it be-
fore loosening.
1. To loosen the track, slowly turn valve (1) counter-
clockwise using long socket 24; grease will escape
from the grease outlet.
2. Between 1 to 1.5 turns of valve (1) is sufficient to
loosen the track.
3. If grease does not drain smoothly, slowly rotate the
raised track.
4. When proper track sag is obtained, turn valve (1)
clockwise and tighten to 147 N m (15 kgf m, 108
lbf ft).
Tighten the Track
CAUTION: It is abnormal if the track remains
tight after turning valve (1) counterclockwise or if
the track is still loose after charging grease to fit-
ting (2). In such cases, NEVER ATTEMPT TO DIS-
ASSEMBLE the track shoes or track adjuster, be-
cause of dangerous high-pressure grease inside
the track adjuster. See your authorized dealer
immediately.
To tighten the track, connect grease lubricator or a grease
gun to grease fitting (2) and add grease until the sag is
within specifications.
MAINTENANCE
7-111
2
2 1
Grease Outlet
1
M18C-07-048
M18C-07-049