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Grove
Published 3-22-2021, Control # 702-02
4-11
GRT8120 OPERATOR MANUAL
OPERATING PROCEDURES
4
CRANE WARM-UP PROCEDURES
The following procedures must be followed to properly warm
different crane components before operating the crane.
NOTE:
For temperatures below -9°C (15°F), refer to arctic
lubricants and conditions in the Operator and
Service Manuals.
Before starting crane, make sure appropriate lubricants are
used for ambient temperatures in which the crane will
operate (a list of lubricants and temperature ranges can be
found in section titled
6-1, by contacting your local Grove distributor, or by
contacting Manitowoc Crane Care directly).
Engine
Warm-up Procedures for All Temperature Ranges:
1.
After starting, allow engine to idle for 3 to 5 minutes
before operating with a load.
2.
Cold Engine Startup: After allowing engine to warm by
idling it for 3 to 5 minutes, slowly increase engine speed
to provide adequate lubrication to bearings and to allow
oil pressure to stabilize.
Transmission
For full-load functionality, a minimum sump temperature of
20°C (68°F) is required. Operating the transmission with a
sump temperature less than 20°C (68°F) is limited to:
•
operating in the neutral gear or
•
driving with an unloaded crane while not exceeding
1500 engine RPM and not exceeding half throttle.
Warm-up Procedures for Rough Terrain (GRT) Cranes:
1.
Setup crane on outriggers.
2.
Engage transmission with four-wheel drive selected and
allow crane to run at idle until the temperature of the
transmission sump reaches 20°C (68°F).
NOTE:
Warm-up operation of four-wheel drive
transmission engaged in two-wheel drive only
could cause transmission damage.
Alternate Warm-up Procedures for Rough Terrain (GRT)
Cranes:
1.
Engage parking brake and apply service brake.
2.
Shift transmission into the highest gear and increase
engine speed to 1500 for 15 seconds, then allow engine
speed to return to idle.
3.
Repeat Step 2 until the temperature of the transmission
sump reaches 20°C (68°F).
Hoist
Warm-up procedures are recommended at every startup and
required at ambient temperatures below 4°C (40°F).
Warm-up Procedures - Standard Hydraulic Oil:
1.
Without operating the hoist function, warm the hydraulic
oil (see
Hydraulic Oil System, page 4-12
2.
Once hydraulic system is warm, operate the unloaded
hoist, in both directions, at low speeds several times to
prime all hydraulic lines with warm hydraulic oil and to
circulate gear lubricant through the planetary gear sets.
Warm-up Procedures - Cold Weather Hydraulic Oil:
Operate the unloaded hoist, in both directions, at low speeds
several times to circulate gear lubricant through the
planetary gear sets.
Swing Drive and Turntable Bearing
Warm-up Procedures for Temperatures Above -7°C
(20°F):
1.
Setup crane on fully extended outriggers, with boom
fully retracted and near maximum boom angle with no
load applied.
2.
Rotate superstructure at a speed of less than one RPM
for at least one complete revolution in one direction, then
rotate superstructure at a speed of less than one RPM
for at least one complete revolution in opposite direction.
Warm-up Procedures for Temperatures Below -7°C
(20°F):
1.
Setup crane on fully extended outriggers, with boom
fully retracted and near maximum boom angle with no
load applied.
2.
Rotate superstructure at a speed of less than one-half
RPM for at least two complete revolutions in one
direction, then rotate superstructure at a speed of less
than one-half RPM for at least two complete revolutions
in the opposite direction.
CAUTION
Crane Damage Hazard!
Operating crane with incorrect lubricants and fluids for the
prevailing ambient temperature and/or failing to
adequately warm crane before cold weather operation
can lead to a failure of a crane component or system.
Always use Grove recommended lubricants and fluids for
prevailing ambient temperature. Properly start and warm
crane using cold weather procedures found in this
Operator Manual and supplement before operating crane
at full load.
Содержание Grove GRT8120
Страница 1: ...Operator Manual Grove GRT8120 ...
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Страница 16: ...TABLE OF CONTENTS GRT8120 A 12 THIS PAGE BLANK ...
Страница 24: ...INTRODUCTION GRT8120 OPERATOR MANUAL 1 8 Published 3 22 2021 Control 702 02 THIS PAGE BLANK ...
Страница 74: ...SAFETY INFORMATION GRT8120 OPERATOR MANUAL 2 50 Published 3 22 2021 Control 702 02 THIS PAGE BLANK ...
Страница 182: ...OPERATING PROCEDURES GRT8120 OPERATOR MANUAL 4 52 Published 3 22 2021 Control 702 02 FIGURE 4 54 ...
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Страница 221: ...Grove Published 3 22 2021 Control 702 02 4 91 GRT8120 OPERATOR MANUAL OPERATING PROCEDURES 4 THIS PAGE BLANK ...
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