CRANE INSTALLATION SERVICE MANUAL 1400A
9-6 1-21-2019 Control # 104-07
Do not confuse engine crankshaft rotation with power take
off rotation. If the power take off shaft rotates opposite the
engine crankshaft, it is turning in a CW direction when
viewed from the rear of the truck. If the power take off shaft
rotates the same as the engine crankshaft, it is turning in a
CCW direction when viewed from the rear of the truck.
TRUCK FRAME STRENGTH
For a truck frame to be suitable for a Series 1400A crane, the
truck frame must:
• be rigid enough to allow excessive boom movement due
to truck frame deflection when lifting over the front of the
unit.
• be strong enough to resist the loading induced by the
crane.
• not permanently bend or deform.
The Section Modulus (S.M.), which determines the rigidity of
the frame, is a measurement of the cross-sectional area of
the truck 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.
The 1400A Series require a minimum of 372,850 N·m
(3,300,000 in-lb) RBM and 492 cm
3
(30 in
3
) S.M. from the
rear of the truck frame to the front of the front outrigger
boxes. The truck frame strength required from the front of the
outrigger boxes to the single front outrigger attachment point
is variable and is listed in the table below. Most truck frames
have reduced section properties through the front
suspension due to truck frame cut-outs or because outer
channel reinforcement stops short of the front suspension. In
these cases it is imperative that the truck frame is measured
and the section modulus is calculated and compared to the
table below to ensure adequate strength exists for single
front outrigger loading.
The distances listed in the chart below are shown in
figure 9-7.
CAUTION
Rotating the pump in the wrong direction damages the
pump.
Engine and PTO rotate
in opposite directions.
PTO rotates CW
Engine and PTO rotate
in the same direction.
PTO rotates CCW
FIGURE 9-4
Distance From SFO
Attachment
centimeters (Inches)
Section
Modulus Per
cm
3
(Rail in.
3
)
0 - 30 (0 - 12) 44 (2.7)
30 - 61 (12 - 24) 90 (5.5)
61 - 9 (124 - 36) 134 (8.2)
91 - 121 (36 - 48) 180 (11.0)
121 - 152 (48 - 60) 224 (13.7)
152 - 182 (60 - 72) 270 (16.5)
182 - 213 (72 - 84) 315 (19.2)
213 - 243 (84 - 96) 359 (21.9)
243 - 274 (96 - 108) 405 (24.7)
274 - 304 (108 - 120) 449 (27.4)
304 + (120+) 492 (30.0)
Fo
r
Reference
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