Hitachi ZAXIS 135US-6 class Operator's Manual page 213

3. While holding the center of bar (1), press switch (6) and
wind up the screen to adjust screen pull-out.
The left-right position of the screen can be adjusted by
sliding case (7) until it hits stopper (8).
OPERATOR'S STATION
1-139
6
Direction of operation for switch (6)
7
MDFY-01-068
6
MDC1-01-595
MDFY-01-069
8