Manitowoc Published 10-01-12, Control # 044-05 v2 3-59
777 OPERATOR’S MANUAL OPERATING CONTROLS AND PROCEDURES
3
Adjusting Swing Limit Switch
The physical limits defined by position of limit switch
actuators cannot be bypassed. If either actuator is contacted,
swing pump shifts to neutral and swing brake applies.
Limit switch is mounted on front outboard side of rotating bed
for easy access.
1. At initial set-up only, adjust limit switch lever so roller is in
full contact with actuator ramp (Figure 3-34).
2. Remove both limit switch actuators from actuator rail.
3. Program swing limits.
4. Swing rotating bed in either direction to programmed
right or left swing limit.
5. Engage swing lock.
6. Place actuator on rail (Figure 3-34 View B) — to right of
limit switch for swing right limit or to left of limit switch for
swing left limit — so actuator just lightly contacts limit
switch roller. Do not trip limit switch open while
performing this step.
7. Securely tighten setscrews to secure actuator.
8. Swing rotating bed to programmed swing limit in
opposite direction and repeat steps 6 – 7.
NOTE: The operator can swing away from either actuator
by moving swing handle in opposite direction and
building a pressure in that direction (if pump control
is stuck in wrong direction, pressure will not build
up in safe direction and brake will never release).
If for any reason machine swings in wrong direction
after brake has been released (i.e, crane out of
level or excessive side wind) the brake will reapply.
The operator is free to attempt to swing away from
the actuator again or stop and investigate. After
several attempts, it is possible to "ratchet" oneself
well beyond the limit.
Operator, if you are unable to swing away from
actuators in 2-3 attempts, stop and move crane
away from dangerous area before trying to
swing again.
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