Lull 6K Service Manual - Manual (Page 129)

Reference Diagrams
Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K 4-42
1 7-1/2A
3
2
4
6
5 20A
10A
10A
30A
10A
ENGINE
WATER
TEMPERATURE
ENGINE
PRESSURE
OIL VOLTAGE
BATTERY
FUEL
LOCK
OSC
REAR
BRAKE
PARK
PRESS
BRAKE
LOW
10 11
12
7
9 8
1 4
5 6
BOOM/
TRANSFER
EXTEND
LOCK
8 5
GRD
1 12
OIL
2 11
LAMPS
3 10
POWER
4 9
WATER
6 7
FUEL
30
30 86
87A 85 87
86
85 87A 87
TE
BE
T
ANEL
VALVE
PROXIMITY SWITCH POSITION
FOR MACHINES EQUIPPED W/
OPTIONAL 8 FT. TOWER
C
A
BROWN
BLACK WHITE - 16
RED - 16
RED - 16
RED -
1
6
YELLOW - 16
YEL - 16 TAN - 16
RED -
1
6
WHITE - 16
A B
A B
IN
O
U
T
5060
AA
AAA 506
0
A
BB
B
BB
B
50 60
#1 0
#1 0
SWITCHED
36445A
TRANSFER EXTEND PORT
POWER IN
- PROXIMITY SWITCH
RELAY - BOOM EXTEND
GER - BASE END
AL PRESSURE SWITCH
FUSE PANEL
ER - BASE END
AL PRESSURE SWITCH
BOOM EXTEND
PROXIMITY SWITCH
CLOSED WHEN
SENSING METAL
- BOOM EXTEND WARNING
LIGHT RELAY
GROUND
OUT
POWER
12 VDC
BOOM EXTEND PORT
37115X
P30796
P30796
BOOM / TRANSFER EXTEND
LOCKOUT VALVE
R4
R5
S4
TOP VIEW - VALVE PLATE
SOLENOID
BOOM/TRANSFER EXTEND LOCKOUT CIRCUIT
The boom/transfer extend lockout circuit is designed to increase
stability of the machine by limiting how far the boom can be
extended with the outriggers up. The system will disable the
boom extend and transfer extend functions at a boom extension
of 21 feet, and turns on warning light #9 on the cluster gauge.
The left and right outriggers must be lowered to the ground to
allow the boom or transfer carriage to be extended further.
Normally open differential pressure switches in the outrigger
cylinders close when the base end pressure exceeds the rod
end pressure by 92 PSI. When both pressure switches close,
this completes the circuit allowing the boom and transfer
carriage to be extended and turns off light #9. The system is
fail-safe because it requires an electrical signal to enable the
boom to be extended beyond 21 feet.
39949A
SFER
KOUT
NOID
M EXT.
ALLOWED
OOM EXT.
DISABLED
BOOM EXTEND
WARNING
LIGHT (#9)
OFF
ON
OFF
OFF
ALLOWED
M EXT.
M EXT.
ALLOWED
OOM EXT.
DISABLED
ON
OOM EXT.
DISABLED
ON
Boom/Transfer Extend Lockout Circuit Operation, Mid-Inlet Hydraulic System - Diagram 11