Hitachi Zaxis 850LC-3 Operator's Manual page 298

Loosen the Track
WARNING: Do not loosen valve (1) quickly or loosen
it too much as high-pressure grease in the ad-
justing cylinder may spout out. Loosen carefully,
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 before
loosening.
1. To loosen the track, slowly turn valve (1) counterclock-
wise 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) clock-
wise and tighten to147 N•m (15 kgf•m, 108 lbf•ft).
Tighten the Track
WARNING: It is abnormal if the track remains tight af-
ter turning valve (1) counterclockwise or if the track is
still loose after charging grease to fitting (2). In such
cases, NEVER ATTEMPT TO DISASSEMBLE the track or
track adjuster, because of dangerous high-pressure
grease inside the track adjuster. See your authorized
dealer immediately.
To tighten the track, connect a grease gun to grease fitting (2)
and add grease until the sag is within specifications.
Replace the Track
CAUTION: Special training and expertise are needed
to replace the track.
NEVER ATTEMPT to replace the track yourself.
Be sure to ask your authorized dealer for track re-
placement.
MAINTENANCE
2
Grease Outlet
7-86
2
1
1
M116-07-093
M16J-07-083