Hitachi EX27U Operator's Manual page 163

Loosen Track
CAUTION: 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 between
sprockets and track links, remove it be-
fore loosening valve (1).
1. To loosen track, slowly turn valve (1) counter-
clock-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.
3. If grease does not drain smoothly, 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
CAUTION: It is abnormal if track is still tight after
turning valve (1) counterclockwise or track is still
loose after charging grease to grease fitting (2).
In such cases, NEVER ATTEMPT TO DISASSEM-
BLE the track shoes or track adjuster, because of
dangerous high-pressure grease inside the track
adjuster. See your authorized dealer immediately.
To tighten track, connect a grease gun to grease fitting (2)
and add grease until the sag is within specifications.
MAINTENANCE
2
2
7-59
1
Grease Outlet
1
Grease Outlet
M104-07-119
M588-07-052
M104-07-119