Hitachi ZAXIS 135US-6 class Operator's Manual page 414

Loosen the Track
ZX135US-6
d
CAUTION:
 The pressure inside the cylinder of the track adjuster
is high. Do not loosen valve (1) quickly or loosen it
too much as valve (1) may fly out or high-pressure
grease in the adjusting cylinder may spout out.
Slowly loosen valve (1) while keeping body parts and
face away from valve (1). Never loosen grease fitting
(2).
 To prevent accidents, care should be taken to ensure
that hands, feet, and any body parts do not become
entangled when working around the tracks.
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)
counterclockwise using long socket 19; 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 90 N·m (9.0 kgf·m).
Tighten the Track
d
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 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.
MAINTENANCE
2
7-122
1
Grease Outlet
M107-07-075
M104-07-119