Lull 6K Service Manual - Manual (Page 524)

Frame Tilt and Oscillation
7-22 Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K
5. When the proximity switch (S1) energizes the proximity switch relay
(R1), power is also directed from relay (R1) to the rear oscillation lock
warning light relay (R3). When the warning light relay is energized, the
path to ground for the warning light is interrupted and the oscillation
lock warning light goes out.
Boom Positioned Below 40° With the Service Brake Applied
Fig. 7-15: Circuit Operation Below 40° with Service Brake Applied
(Ref. Fig. 7-15) The following describes the rear axle stabilizer circuit logic
when the boom is positioned below 40° elevation with the service brake
applied.
1. When the boom is below 40°, the proximity switch (S1) is sensing the
outer boom. Therefore, the proximity switch is closed. See “Boom
Elevation Proximity Switch” on page 7-43 for more information.
2. A closed proximity switch (S1) energizes the proximity switch relay
(R1) and power is routed through relay (R2) and onto the solenoid
valve (V1) on the stabilizer block. Power is no longer routed to the
transmission (ECU):
3. Power is routed from relay (R1) to frame tilt lockout solenoid valve (V2).
The solenoid valve energizes and allows hydraulic pilot pressure to the
routed to the frame tilt valve section spool. The frame may then be
tilted.
J
1263
Dash Panel
ECU
R1 R2 R3
S2 S3
S1
V2
V1
B
1
C
Parking
Pressure
Brake
Switch
Fuse
Panel
Transmission
Disconnect
Switch
R1 = Proximity Switch Relay
R2 = Service Brake Relay
R3 = Oscillation Lock Warning Light Relay S1 = Proximity Switch
S2 = Service Brake Pressure Switch
S3 = Frame Tilt Override Pressure Switch
V1 = Stabilizer Block Solenoid Valve
V2 = Frame Tilt Lockout Solenoid Valve
B
A
C
B
A
2
3
6
5
4
A B C D E F
D
2 3 7
+
+ –
–
A
B
C
Solenoid
Valve On
Stabilizer
Block
A
B
6 Pole
W/P
Conn.