Manitowoc National Crane NBT40 Series, Service Manual

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3
National Crane
Published 8-01-2017 Control # 287-11
3-9
NBT40 SERVICE MANUAL ELECTRIC SYSTEM
Before replacing a solenoid, check the connector for
corrosion. Clean the connector with fine sand paper and
l u b r i c a t e w i t h e l e c t r o l y t i c g r e a s e . D o n o t u s e a
non-electrolytic grease. This insulates the connection and
prevents solenoid operation. OUTRIGGER MANIFOLDS
There are two outrigger manifolds located on the carrier
frame. The front outrigger manifold is mounted on the center
of the front outrigger box (Figure 3-8) and the rear outrigger
manifold is mounted at the rear of the truck under the T-box
(Figure 3-9).
The swing and outrigger functions are on the same hydraulic
circuit however, only one function at a time can be working.
When the crane function power switch is turned ON, the
outrigger manifolds are disabled.
.
Figure 3-8 Item Lis t
Fault Check
RCL/A2B
Solenoids fail to
energize
• RCL relay R4 in the mini fuse block
• Fuse F9 in the mini fuse block
• Faulty RCL override switches
• Fuse F7 in micro fuse block
• Faulty crane power switch
Minimum Wrap
Indicator Switch
solenoid fails to
energize
• Faulty MWI switch
• Fuse F5 or F8 on the mini fuse block.
• Faulty solenoid
Crane function
power solenoid
fails to energize
• Faulty crane power switch
• Faulty solenoid
• Fuse F1 or F10 in micro fuse block
5
FIGURE 3-8
4
8
1
2
3
7
7601-4
7601-2
Item Solenoid
1 Driver Side O/R Jack
2 Driver Side O/R Beam
3 Front Stabilizer (SFO)
4 Passenger Side O/R Beam
5 Passenger Side O/R Jack
7 Outrigger Extend
8 Outrigger Retract
Item Solenoid
Reference Only