Hitachi Zaxis 850LC-3 Operator's Manual page 292

3. Check the pin lock and rubber lock for wear or cracks and
replace with a new one if necessary.
3.1 Pin lock
The wear limit of the pin lock is 1/3 the tooth point
thickness, as illustrated in the right figure. Earlier re-
placement of the pin lock is recommended.
3.2 Rubber lock
When a tooth point is removed, and if steel balls in the
rubber lock come off or seem ready to come off, this in-
dicates that the rubber lock has reached its service limit.
Replace it with a new one.
4. Check that the nose and tooth point joint surfaces are
free from extrusions like scale, flush and so on. If found,
remove extrusions from them with a putty knife, wire
brush or chisel.
5. Insert the rubber lock into the nose hole.
NOTE: Do not apply grease onto the rubber lock. If grease is
applied, the pin lock will slip out.
MAINTENANCE
Rubber is torn and
steel balls are apt
to come off.
7-80
Service Limits 1/3T
Inapplicable
Nose
Putty Knife
Rubber Lock
Nose
T
M112-07-092
When pushed with
a finger steel balls
move inward.
M112-07-093
M112-07-094
M112-07-095