Manitowoc 777 User Manual

Reference Only
OPERATING CONTROLS AND PROCEDURES 777 OPERATOR’S MANUAL
3-14 Published 10-01-12, Control # 044-05 v2
LIMIT BYPASS TEST: Perform the following test to
determine if the boom up limit on your crane can be
bypassed or not:
1. Lower the boom onto blocking at ground level.
2. Have an assistant push the boom stop limit switch
plunger down to trip the boom up limit switch open (see
Section 4 of Crane Service Manual).
3. Rotate limit bypass key (F1) to the bypass position and
hold.
4. Try to boom up SLOWLY — do not raise the boom any
higher than necessary to perform the test:
a. If the boom rises, your boom up limit can be
bypassed.
b. If the boom does not rise, your boom up limit cannot
be bypassed.
5. The test is complete: release the limit bypass key and
the limit switch plunger to the normal operating
positions.
Table 3-1 Bypassable Limit Identification — PRIOR TO CRANE S/N 7771165
Limit
USA and
non-EUROPEAN
EUROPEAN
Limit
Bypass Switch (F1)
(momentary)
Limit
Bypass Switch (F1)
(momentary)
Jib Up Limit
Bypass Switch (F6)
(maintained)
1
Boom Maximum Up
Yes or No
2
No No
Boom Maximum Down Yes Yes No
Block Up (each load drum) Yes Yes No
Bail – Max and Min (each load drum) Yes Yes No
Load Moment Yes Yes No
Luffing Jib Max Up Yes No Yes
Luffing Jib Max Down Yes Yes No
1
Use only for rigging.
2
The boom up limit cannot be bypassed on current production cranes. To determine if the boom up limit can be bypassed on your
crane, perform the test given below.

Manitowoc 777 Specifications

General

Brand	Manitowoc
Model	777
Category	Construction Equipment
Language	English