Manitowoc 1400A User Manual

National Crane 1-21-2019 Control # 104-07 3-7
1400A SERVICE MANUAL ELECTRIC SYSTEM
3
RCL, ATB, and Crane Manifold Solenoids
The RCL and ATB solenoids are located in the turret and
disable the crane operations that worsen an impending
tipping or two block conditions. The operations listed below
are disabled when the solenoids are energized.
1. Boom Down
2. Auxiliary Hoist Up (Optional)
3. Boom Telescope Extend
4. Hoist Up
The crane manifold solenoids are located in the turret and
provide for the following operations.
5. Crane Function Power - enables all crane functions
when energized.
6. Air Conditioner - runs the air conditioner compressor
when energized.
7. Swing Brake - applies the swing brake when energized.
Before replacing a solenoid, check the connector for
corrosion. Clean the connector with fine sand paper and
lubricate with electrolytic grease. Do not use a
non-electrolytic grease. This insulates the connection and
prevents solenoid operation.
FIGURE 3-5
RCL and ATB
dump solenoids
1
2
3
4
5
6
7
Item Relay
1 Boom Down
2 Auxiliary Hoist Up (optional)
3 Boom Telescope Extend
4Hoist Up
5 Crane Function Power
6 Air Conditioner (Optional)
7 Swing Brake
Crane
Manifold
Solenoids
Fault Check
RCL/A2B
Solenoids fail to
energize
• RCL relay R3 in the mini fuse block
• Fuse F9 in the mini fuse block
• Faulty RCL override switches
• Fuse F6 in micro fuse block
• Faulty crane power switch
Burst of speed
solenoid fails to
energize
• Faulty BOS switch
• Fuse F1 on the mini fuse block.
• Faulty solenoid
Crane function
power solenoid
fails to energize
• Faulty crane power switch
• Faulty solenoid
• Fuse F4 in micro fuse block
Fo
r
Reference
Only

Manitowoc 1400A Specifications

General

Brand	Manitowoc
Model	1400A
Category	Construction Equipment
Language	English