Manitowoc 777 User Manual

Reference Only
OPERATING CONTROLS AND PROCEDURES 777 OPERATOR’S MANUAL
3-32 Published 10-01-12, Control # 044-05 v2
8. If desired, turn off diagnostic screens:
a. Depress limit bypass button or turn limit bypass key
clockwise.
a. Once step 8a is performed, scroll down at least one
screen and release button or key.
Stopping engine will also turn off diagnostic screens.
Load Drum Operation
There are three drive arrangements for the load drums:
• Standard Arrangement: one motor, planetary, disc brake
and band brake on the right end of the drum.
• High Line Pull Arrangement (optional): one motor,
planetary, disc brake and band brake on the right end of
the drum and another motor, planetary, disc brake and
band brake on the left end of the drum.
• High Line Speed Arrangement (optional): one motor,
planetary, disc brake and band brake on the right end of
the drum and another motor, planetary, disc brake (no
band brake) on the left end of the drum.
NOTE: See Drum and Lagging Charts in Capacity Chart
Manual for drum identification.
Liftcrane Operation — Full Power
NOTE: When a drum is not in free fall mode it operates in
full-power.
1. Turn off free fall, if equipped, for drum to be operated.
2. Select and confirm desired crane mode. (STANDARD
LUFFING JIB)
3. Disengage drum pawl for drum to be operated.
NOTE: The load will not lower until corresponding drum
pawl is disengaged. It may be necessary to raise
load slightly before pawl will disengage.
4. Release drum brake with brake pedal (if equipped) for
drum to be operated.
NOTE: The brake pedal can be pressed down at any time
to slow down or to stop the load.
5. Turn off drum park for drum to be operated.
6. Increase engine speed to desired rpm with hand throttle.
Press foot throttle to momentarily increase engine speed
when more power is required.
7. Move drum handle to REAR from off to RAISE load or to
FRONT from off to LOWER load.
8. As load nears desired position, slowly move drum
handle toward off to slow down load. Then release
handle to off to stop load and hold it in position (drum
brake will apply).
Liftcrane Operation — Free Fall
1. Fully apply drum working brake for drum to be operated
in free fall.
2. Turn off drum park for drum to be operated in free fall.
3. Select and confirm FFALL ON mode for drum to be
operated.
NOTE: The load drum will not switch to free fall until drum
park is off and the selection and confirmation steps
have been performed (see Crane Mode Selector
for procedure).
4. Disengage drum pawl for drum to be operated.
NOTE: The load will not lower until corresponding drum
pawl is disengaged. It may be necessary to hoist
load slightly before pawl will disengage.
5. Increase engine speed to desired rpm with hand throttle.
Press foot throttle to momentarily increase engine speed
when more power is required.
6. Move drum handle to REAR from off and release drum
brake with brake pedal to RAISE load with hydraulic
power.
7. As load nears desired position, slowly move drum
handle toward off to slow down load. Then fully apply
WARNING
Falling Load Hazard!
Prevent load on unused drum from falling. Engage drum
pawl, apply drum brake with brake pedal (if equipped),
and turn on drum park for drum not in use.
CAUTION
Machinery Damage!
Do not engage drum pawl while lowering a load. Damage
to pawl or drum may result.
Stop drum with control handle or brake pedal (if equipped)
and then engage drum pawl.
CAUTION
Machinery Damage!
Do not engage drum pawl while lowering a load. Damage
to pawl or drum may result.
Stop drum with brake pedal and then engage drum pawl.

Manitowoc 777 Specifications

General

Brand	Manitowoc
Model	777
Category	Construction Equipment
Language	English