Hitachi ZX27U-2 Operator's Manual page 179

Loosen Track (Steel Crawler)
WARNING: Do not loosen valve (1) too quickly or
too much as high-pressure grease in the adjust-
ing 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 around
the components in the undercarriage,
remove it before loosening valve (1).
1. To loosen track, slowly turn valve (1) counterclock-
wise using a socket wrench (long socket 19); grease
will escape from grease outlet.
2. Between 1 and 1.5 turns of valve (1) are sufficient to
loosen track. Never attempt to loosen the valve fur-
ther.
3. If grease does not drain smoothly, raise the track to
be loosed off the ground and slowly rotate the track.
4. When proper track sag is obtained, turn valve (1)
clockwise and tighten it to 88 N⋅m (9 kgf⋅m, 65 lbf⋅ft).
Tighten Track (Steel Crawler)
WARNING: In case the track sag is not adjustable,
this is a very hazardous situation. Since the track
adjuster spring is excessively loaded, the grease
pressure inside the track adjuster cylinder is very
high. Incorrect adjustment or disassembly may
result in personal injury and/or death. Immedi-
ately consult your authorized dealer for repair.
To tighten track, connect a grease gun to cylinder
grease fitting (2) located inside the side frame and
add grease until the sag is within specifications.
MAINTENANCE
2
2
7-59
1
1
M1LA-07-013
Grease Outlet
M1LA-07-036
Grease Outlet
M1LA-07-036