CRANE INSTALLATION NBT30H-2 SERVICE MANUAL
9-12 03-20-2019 Control # 613-06
• Overhang - The amount of overhang allowed varies
from state to state. 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 as outlined in the section titled PTO and
Hydraulic Pump, page 9-5. PTO’s are not furnished by
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 (Figure 9-4).
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 driveline is used, locate the pump no more than 106
cm (42 inches) from the PTO. Do not exceed a 15° angle
on the driveline. The driveline U-joint yokes on both
ends of the driveshaft must be parallel with each other.
The drivelines need to be sized so they can safely carry
the maximum pump horsepower requirements.
Drivelines are not normally furnished by the factory.
5. Plan the location of the pump mounting bracket and
driveline so that ample clearance is maintained between
pump and truck driveshaft 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 to 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 by means of
two threaded tapered sections, one male and one
female. When these two tapers meet, you will note
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 Pump Manual for information on how to
rotate pump ports and how to convert pump rotation.
• If using a driveshaft type of mount, connect PTO
driveshaft to pump and PTO. Drill a 0.31" dia. x 7.87 mm
x 3 mm (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.
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