Manitowoc National Crane NBT40 Series, Service Manual

Page: 196 / 220

CRANE INSTALLATION NBT40 SERVICE MANUAL
9-18
Published 8-01-2017 Control # 287-11
TRUCK PREPARATION
Plan the installation of the crane location for:
• the front axle weight.
• the rear axle weight.
• the boom overhang.
Check the final weight to verify that final truck weight with
crane, reinforcement, counterweight and options such as jib,
etc. complies with the appropriate laws.
Welding Precautions
Sensitive truck computer and crane RCL system
components can be damaged by welding on the truck or
crane. The following precautions must be taken:
• Disconnect both positive and negative battery cables.
• Attach welding ground lead as close as possible to area
to be welded.
Positioning the Crane On the Truck
The final user of the crane must be familiar with state axle
and length laws in force at the time the crane is mounted on
the truck. Following are items which must be considered.
• Overall Length - Most states have a maximum straight
truck length limit of 40 feet (12.19 m). Using a truck that
has a too long WB may exceed this limit.
• Axle Weights - All states allow 20,000 lb (9,072 kg)
single axle weight and 34,000 lb (15,422 kg) tandem
axle weights on primary roads. However, some states
restrict the axle weight to less on secondary roads or at
certain times throughout the year. Be aware of your
state’s axle laws for weight restrictions.
• Overhang - The most restrictive overhang laws call for a
maximum of three feet in front of the truck. Check on
your state requirements.
PTO, PUMP, AND RESERVOIR
1. Select the PTO according to the PTO Requirements
Section on page 9-12. 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 9-12).
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
42 inches (106 cm) 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 6 inch
(15.25 cm) 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.
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.
CAUTION
Rotating the pump in the wrong direction damages the
pump.
Reference Only