Hitachi ZAXIS 135US-5B Operator's Manual page 427

Tighten the Track
d
CAUTION: It is abnormal if the track can not be
adjusted. The strong force acts on the spring in track
adjuster. Therefore, the grease in cylinder is highly
pressurized. 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.
OPTIONAL ATTACHMENTS AND DEVICES
13-7
2
MDAA-07-057