Manitowoc National Crane 800D, Operator'S And Service Manual

Page: 202 / 256

INSTALLATION 800D
9-8
Published 5-27-2018 Control # 039-06
PTO SELECTION
Operating speeds and performance of the crane are based
on proper pump outputs to the hoist, lift, telescope and swing
circuits. A triple pump system is standard equipment on the
800D. This pump supplies 34 (128), 18 (68) and 10 (37) gpm
(l/min) to the appropriate crane circuits when operating at
2500 RPM.
The speeds shown below are optimum operating speeds.
The engine must be operated at a speed such that the
horsepower developed is adequate to pull the pumps under
pressure.
Do not attempt to turn pump in the opposite direction of
the indicating arrow on the pump housing, pump failure
will result.
See pump rotation section to determine correct pump for
your application.
TRUCK FRAME STRENGTH
In order for a truck frame to be suitable for accepting a Series
800D size crane, the truck frame must have a requirement
for rigidity so as not to allow excessive boom movement due
to truck frame deflection, and it must be strong enough to
resist the loading induced by the crane so as not to
permanently bend or deform. Section Modulus (S.M.) is a
measurement of the area of the truck frame and determines
the rigidity of the frame. Resistance to bending moment
(RBM) is a measurement of strength and is determined by
multiplying the section modulus of each frame rail by the
yield strength of the rail material.
For a standard, behind-the-cab mount, 180° stability, the
Series 800D crane requires a minimum of 1,749,000 lb-in
(197 610 Nm) RBM and 15.9 in
3
(260 cm
3
) S.M. under the
crane frame between the front and rear springs with
1,430,000 lb-in (161 568 Nm) RBM and 13.0 in
3
(213 cm
3
)
S.M. through suspension to rear stabilizers on each truck
frame rail. For 360° stability the truck frame must have a
20.0 in
3
(327 cm
3
) section modulus [2,200,000 lb-in
(248 566 Nm) RBM] minimum under the crane frame,
11.0 in
3
(180 cm
3
) section modulus [1,210,000 lb-in
[136 711 Nm] RBM) at the front spring rear hanger, 7.5 in
3
(123 cm
3
) section modulus [825 000 lb-in (93 212 Nm) RBM]
through the front spring and 2 in
3
(33 cm
3
) section modulus
[220,000 lb-in (24 856 N·m) RBM] at the stabilizer
attachment point on each truck frame rail. Listed below is a
table showing the commonly used truck frame and
reinforcing materials and the section modulus required for
each material to ensure adequate strength and rigidity. In all
cases, the minimum requirements for section modulus and
RBM must be met.
ENGINE SPEED (RPM)
FOR 2500 RPM PUMP
SHAFT SPEED
PTO RATIO
86%
89%
96%
100%
104%
114%
125%
139%
156%
1167%
2900
2800
2600
2500
2400
2200
2000
1800
1600
1500
Gasoline Engine
Optimum Speed
Range
Diesel Engine
Optimum Speed
Range
9433
Truck Frame or
Reinforcing
Material
Min. Section
Modulus Under
Crane
Min. Section
Modulus Thru
Rear Suspension
RBM Under
Crane
RBM Thru
Suspension
180°
Stability
110,000 PSI
(758 MPa)
15.9 in
3
(260 cm
3
)
13.0 in
3
(213 cm
3
)
1,749,000 lb-in
(197 610 Nm)
1,430,000 lb-in
(161 568 Nm)
360°
Stability
110,000 PSI
(758 MPa)
20.0 in
3
(327 cm
3
)
13.0 in
3
(213 cm
3
)
2,200,000 lb-in
(248 566 Nm)
1,430,000 lb-in
(161 568 Nm)
Fo
r
Reference
Only