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Grove
Published 3-25-2020, Control # 643-04
3-71
GRT880 OPERATOR MANUAL
OPERATING CONTROLS AND PROCEDURES
3
4.
Lock differentials only when maximum traction is
needed on poor road or highway surfaces.
5.
Always unlock differentials when need for maximum
traction has passed or when traveling on good road or
highway surfaces.
Operation
The differential lock function should preferably be engaged
when crane is stationary but may be engaged when moving,
if the following conditions are met:
1.
Crane is moving very slowly (creep speed).
2.
Wheels are not spinning at time of engagement.
When traveling with differentials locked, do not deviate from
a straight path more than absolutely necessary. Engage
differential locks by doing the following:
1.
Position Axle Differential Lock Control Switch to the
locked position with crane stationary or moving at a slow
speed.
If moving at a slow speed, let up momentarily on the
Foot Throttle Pedal to relieve torque on the differential
gearing. This will fully engage differential locks.
NOTE:
When differentials are locked, Axle Differential
Locked Indicator illuminates.
2.
Proceed over poor road condition cautiously.
When adverse condition have passed, disengage differential
locks by doing the following:
1.
Release Axle Differential Lock Control Switch, allowing it
to return to the unlocked position while maintaining a
slow speed.
2.
Let up momentarily on the Foot Throttle Pedal to relieve
torque on the differential gearing, allowing differential to
fully unlock.
NOTE:
When differentials are unlocked, Axle Differential
Locked Indicator will not be illuminated.
3.
Resume driving at a normal speed using good driving
judgment.
Axle Oscillation Lockouts Operation
The following procedure should be used to periodically
check the axle oscillation system and ensure it is in proper
working condition.
1.
Ensure tires are inflated to recommended pressure.
Refer to
Load Chart Book
in the crane cab for proper
inflation pressures.
2.
With hook unloaded, boom fully retracted and centered
over the front at no more than a 10° to 15° boom angle,
position crane on a block or curb so one rear tire is
approximately 15 to 30 cm (6 to 12 in) above the level of
the opposite tire.
3.
Slowly swing superstructure to left or right until axle
oscillation lockout valve is activated. This will lock rear
axle out of level. Do not swing beyond tire track.
4.
After engaging swing brake, slowly drive off of block or
curb and stop. Rear tires should both be touching the
road surface and opposite front tire should be light or
slightly off road surface.
5.
Release swing brake and swing superstructure until it is
centered over the front.
If axle oscillation lockout valve is functioning properly,
crane will re-level itself; if valve is not working properly,
crane will not re-level itself. If rear axle does not lock or
unlock properly, evaluate lockout system and repair as
necessary.
General Crane Operation
Pump Drive
Main #1 and #2 hydraulic pumps are mounted to rear of
transmission driven PTO.
The #3 hydraulic pump is direct engine driven and mounted
to lower left side of engine.
Joystick Operation
The joystick operation for crane functions is proportional, i.e.,
the closer lever is to neutral (center), the slower the system
responds. Return the joystick to neutral to hold the load. Do
not feather hoist control to hold the load.
NOTE:
Always operate joysticks with slow, even pressure.
Preload Check
After crane has been readied for service, an operational
check of all crane functions (with no load applied) should be
performed. Preload check is as follows:
CAUTION
Possible Loss of Vehicle Stability!
Do not lock differentials when vehicle is traveling down
steep grades and traction is minimal.
DANGER
Tipping Hazard!
Do not operate crane if axle oscillation lockout system is
not functioning properly.
Failure to comply with this warning may result in death or
serious injury.
Содержание Grove GRT880
Страница 1: ...Operator Manual Grove GRT880 8968 ...
Страница 4: ...THIS PAGE BLANK ...
Страница 10: ...TABLE OF CONTENTS GRT880 TOC 6 THIS PAGE BLANK ...
Страница 16: ...INTRODUCTION GRT880 OPERATOR MANUAL 1 6 Published 3 25 2020 Control 643 04 THIS PAGE BLANK ...
Страница 54: ...SAFETY INFORMATION GRT880 OPERATOR MANUAL 2 38 Published 3 25 2020 Control 643 04 8496 3 FIGURE 2 10 ...
Страница 166: ...SET UP AND INSTALLATION GRT880 OPERATOR MANUAL 4 24 Published 3 25 2020 Control 643 04 THIS PAGE BLANK ...
Страница 198: ...5 32 Published 3 25 2020 Control 643 04 MAINTENANCE AND LUBRICATION GRT880 OPERATOR MANUAL THIS PAGE BLANK ...
Страница 200: ...OPERATOR MANUAL GRT880 6 2 THIS PAGE BLANK ...
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