OPERATING CONTROLS AND PROCEDURES GRT8100 OPERATOR MANUAL
3-70 Published 3-25-2020, Control # 595-10
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 hydraulic pump is mounted to rear of transmission
driven PTO.
The #2 hydraulic pump is direct engine driven and mounted
to lower left side of engine.
Control Lever Operation
The control lever operation for crane functions is
proportional, i.e., the closer lever is to neutral (center), the
slower the system responds. Return the control lever to
neutral to hold the load. Do not feather hoist control to hold
the load.
NOTE: Always operate control levers 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:
• Extend and set outriggers and level crane.
• Raise, lower, and swing boom right and left at least 45
degrees.
• Telescope boom out and back in, ensuring all sections
extend and retract properly.
• Raise and lower cable a few times at various boom
lengths. Make sure there are no kinks and cable is
spooling on hoist properly.
NOTE: Carefully read and become familiar with all crane
operating instructions before operating the crane.
Using Your Load Chart
NOTE: One of the most important tools of every Grove
crane is the load chart in the crane operator's cab.
NOTE: Refer to Figure 3-31 for terms to know in
determining lifting capacities.
The load chart contains crane lifting capacities in all
allowable lifting configurations and must be thoroughly
understood by the operator.
The load chart is divided into capabilities limited by crane
structural strength and stability which is shown by a bold line
across the chart. Structural strength limits are above the line
and stability limits are below the line.
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.
CAUTION
Run engine at or near governed RPM during operation of
all crane functions.
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