National Crane 1-21-2019 Control # 104-07 9-11
1400A SERVICE MANUAL CRANE INSTALLATION
• Overhang - The most restrictive overhang laws call for a
maximum of three feet in front of the truck. Check on
your state requirements.
• Federal Bridge Law - The Federal Bridge Law in effect
currently states that in order to carry 24,493 kg (54,000
lb) on a three axle truck, the extremes of any group of
axles must be at least 7.16 m (23.5 feet) apart. This
equates to a truck with a wheelbase of at least 655 cm
(258 inches) with a minimum length of 61 cm (24 inches)
from the center of tandems to the center of the rear axle.
PTO, PUMP, AND RESERVOIR
1. Select the PTO according to the PTO Requirements
Section on page 9-5. PTO’s are not furnished by the
National Crane.
2. Install the PTO and PTO shifting mechanism according
to the PTO manufacturer’s instructions. If the PTO has a
reverse gear, it must be blocked out. The pump cannot
run backwards (page 9-5).
3. If mounting flanges integral to the PTO are used, the
pump can be mounted directly to the PTO. Be sure
adequate clearance exists for this type of pump mount.
4. If a drive line is used, locate the pump no more than 106
cm (42 inches) from the PTO. Do not exceed a 15° angle
on the drive line. The drive line U-joint yokes on both
ends of the drive shaft must be parallel with each other.
The drive lines need be sized so they can safely carry
the maximum pump horsepower requirements. Drive
lines are furnished by National Crane.
5. Plan the location of the pump mounting bracket and
drive line so that ample clearance is maintained
between pump and truck drive shaft or exhaust system.
Position the Pump so that the hydraulic lines can be
connected without sharp bends especially the large
suction line. The pump mounting brackets can be
attached to existing frame crossmembers or a 15.25 cm
(6 inch) channel crossmember be installed.
6. Install the pump mounting bracket (driveline driven
pumps only) securely to the truck frame. Attach the
pump to the pump mounting plate or directly to the PTO
using the capscrews provided. Install a pump support
bar at the rear of the pump and, if the pump is driven by
a driveline, bolt or weld the upper end to a crossmember.
If the pump is mounted on the PTO, the rear mounting
bar can be attached to a transmission bolt. The rear of
the pump must be supported regardless of the mounting
method.
NOTE: Some of the pipe fittings are sealed with two
threaded tapered sections, one male and one
female. When these two tapers meet, there is a
sudden increase in the force required to screw the
fittings together. Further tightening does not
increase the seal of the joint and can ruin the
connection. Use pipe thread sealant on tapered
pipe fittings.
Other fittings are of the O-ring boss type. To install
this fitting, screw the lock nut in to the upper thread
land. Insert the fitting into the port until the nut
contacts the surface of the port. Adjust the fitting to
the desired direction and tighten the locknut
Most pressure fittings are the O-ring face seal
types. A small O-ring is compressed between the
male and female fittings of the joint. Be sure the
O-ring is present on the fitting and seated properly
in its groove before the fittings are tightened.
• Remove the dust covers from the pump inlet and outlet
ports. Verify that the suction and pressure sides of the
pump are correct while rotating the pump in the same
direction as the PTO. Rotate the pump in the mounting
bracket so suction side is toward the reservoir suction
port. Refer to the pump manual for information on how to
rotate pump ports and how to convert pump rotation.
• If using a drive shaft type of mount, connect the PTO
drive shaft to the pump and PTO. Drill a 7.87 mm x 3 mm
(0.31" dia. x 0.12") deep hole on the flat of the hex shaft
at the fixed yoke end of the drive shaft to engage the
yoke set screw. A small flat area should be ground in the
O.D. of the splined pump shaft to engage the pump yoke
set screw. Apply Loctite and tighten the shaft setscrews
and grease the PTO universal joints.
REINFORCING AFTER FRAME EXTENSION
1. Measure the truck frame and use the Section Modulus
Tables to determine the section modulus of the frame. If
reinforcing is required, use at least 100,000 psi steel to
minimize the amount of reinforcing required. Use Grade
90 weld material for any welding to be done.
2. Strip the frame of obstructions in the area to be
reinforced or extended, one side at a time. If the truck
frame crossmembers are bolted in, remove the bolts. Do
not remove rivets.
CAUTION
Rotating the pump in the wrong direction damages the
pump.
Fo
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