99903514:TELESCOPIC CRANE: 4-6
SECTION 4: INSTALLATION
4.5 MODEL SPECIFIC CRANE & HY-
DRAULIC INSTALLATION GUIDES
4.5.1 GENERAL
This section is intended to serve as a general
guide in the installation of a specific model of
IMT crane. Since each installation is
considered unique, certain components, such
as the power unit’s battery cable must be cut
to the proper length.
4.5.2 CHASSIS INFORMATION
Your crane is designed for use with an IMT
body installed on a vehicle meeting minimum
chassis requirements including a specific
body style, wheelbase dimension, cab-to-axle
dimension, frame section modulus, RBM*,
axle ratings, and gross vehicle ratings. A chart
with this information is included in crane
installation section.
* (RBM is a figure of relative strength of a
specific frame which is made of a specific
grade of steel. RBM is calculated by the
multiplication of Frame Section Modulus (in3)
by Frame Yield Strength.)
If this crane is being installed on any body
other than an IMT mechanic body, check with
IMT to determine the suitability of that body.
WARNING
THE USE OF THIS CRANE ON A BODY
NOT CAPABLE OF HANDLING THE
LOADS IMPOSED ON IT BY THE
CRANE, MAY RESULT IN SERIOUS
INJURY OR DEATH.
4-4: ENGINE SPEED REGULATION
The delivery rate of the hydraulic pump deter-
mine the operating speed of the crane. In
order for the crane to function at speeds
stated in the Crane Specifications, the pump
must operate at the speed required for the
proper delivery rate (required pump speed).
To determine the required pump speed, you
must know the rated capacity of the pump, the
pump speed required for the rated capacity,
and the required delivery rate for the proper
crane performance.
To determine the engine RPM necessary for
required pump speed, the required pump
speed is divided by the engine to PTO ratio.
(The PTO ratio is generally specified as a
percentage of engine speed.)
If you don’t know the engine to PTO ratio, or
the pump capacity, contact your dealer or IMT.
To find the engine to PTO ratio, you must
know the PTO and transmission model
numbers as well as the make, model, and
year of the truck. To find the proper pump
capacity, you must know the pump make and
model. Once you’ve obtained this information,
record it below.
PUMP CAPACITY ENGINE TO PTO RATIO
Efficient operation of your crane is dependent
upon proper pump speed. When operation is
too slow, check the pump speed when diag-
nosing the cause. A tachometer with accurate
calibration may be used to check engine
speed.
C = Rated Pump Capacity
D = Delivery Rate Required for
Proper Pump Performance
RPM = Pump Speed Required for
Rated Pump Capacity
D
X RPM = REQUIRED PUMP
C SPEED
EXAMPLE:
(D) 9 GPM 1384 RPM
X 2000 RPM = (REQUIRED
(C) 13 GPM PUMP SPEED)
Required Pump Speed Required
= Engine
PTO Ratio (%) Speed
(RPM)
EXAMPLE:
(Required Pump Speed)
1385
= 1980 RPM
.70
(PTO Ratio of 70%)
Figure D-6: Formula- Engine RPM
Figure D-5: Formula- Required Pump Speed
20030115
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