OPERATING CONTROLS AND PROCEDURES 777 OPERATOR’S MANUAL
3-34 Published 10-01-12, Control # 044-05 v2
1. Push holding line handle forward to lower bucket at
desired speed.
2. Control lowering speed by slowly moving holding line
handle toward off.
NOTE: Lowering speed is controlled by handle movement.
It is not necessary to apply the drum brakes with
the brake pedals to slow down the bucket when
operating in full-power.
3. Swing back to digging area as bucket lowers.
4. Stop swinging when bucket lands in digging area.
5. Bucket will stop lowering automatically when it contacts
ground.
6. Release holding line handle to off.
7. Repeat clam cycle.
Travel Operation
1. Before traveling:
a. Plan travel route. It must be free of ground and
overhead constructions.
b. Check crawlers for proper adjustment.
c. Warn personnel to stand clear of travel area. Do not
travel without a signal person.
2. Position boom at or above boom angle given on capacity
chart when traveling with load.
3. Travel with boom in-line with crawlers except when
swinging is necessary while traveling. Travel with boom
facing direction of travel.
4. For traveling with load, carry load as close to ground as
possible; stabilize load with taglines.
For traveling without load, carry load block and weight
ball low enough that they cannot swing into boom or jib.
If desired, tie off load block at front of rotating bed.
5. Increase engine speed to desired rpm with hand throttle.
Press foot throttle to momentarily increase engine speed
when more power is required.
6. Select desired travel speed, low or high.
NOTE: The following directions of travel are with crawler
drive shafts to rear of operator. If the drive shafts
WARNING
Tipping Hazard!
Travel surface must be firm and uniformly supporting.
For traveling with load, grade must not exceed 1% in any
direction.
For traveling without load, grade in direction of travel must
not exceed 30%; grade from side to side must not exceed
2%, measured at boom hinge pins. For all travel on
grades, see Maximum Allowable Travel Specifications
chart.
Failing to comply with above specifications can result in
tipping.
WARNING
Moving Crane Hazard!
Know position of crawler drive shafts before traveling. An
accident can result if crane travels opposite of intended
direction.
CAUTION
Boom Damage!
Avoid shock loading boom and rigging!
Perform all travel functions — starting, turning, stopping
— slowly and smoothly.
Crawler Damage!
Avoid damage to crawler components (treads, rollers,
frames)!
Use care to prevent dirt from piling up at tumbler and front
roller ends of crawlers when turning on soft surfaces:
• Bring crawlers to a complete stop before changing
travel direction.
• Turn a few degrees. Then slowly travel forward or
reverse so dirt falls away from crawlers. Continue this
procedure until desired turn has been made.
• Avoid sharp turns (Figure 3-18) if possible.
• Make gradual turns (Figure 3-19) or counter- rotate
(Figure 3-20) whenever possible so both crawlers are
always powered.
• Clean crawlers often.
• Keep crawler treads properly adjusted.
WARNING
Flying Object Hazard!
Excessive dirt build-up at tumbler and front roller ends of
crawlers can result in excessive tension in tread
connectors. Tread connectors can break if over
tensioned, causing treads to fly apart unexpectedly with
dangerous force.
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