JACK 1U9744 - Caterpillar

These harnesses have various relays and diodes that are required to run the float system. This system is rather complex. Refer to the following section to understand the system logic and troubleshoot if the need arises.Troubleshooting Procedure
Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.
Illustration 1 g06335341
Relay location in the LH battery box
Illustration 2 g06335342
Butt-N-Top schematic
Illustration 3 g06335343
Condition 1
Hydraulic lock: OFF, float switch: off
Relays 1, 2, 3 hydraulic lock and Float Mode Ind/Dim on
No function active
Illustration 4 g06335344
Condition 2a
Hydraulic lock: ON, float switch: off
Relays 2, 4 hydraulic lock, and Float Mode Ind/Dim on
No function active
In condition 2a, the relay is turned off by equal voltage on both sides of the coil.
Illustration 5 g06335346
Condition 2
Hydraulic lock: ON, float switch: off
Relays 2, 4 hydraulic lock, and Float Mode Ind/Dim on
No function active
Illustration 6 g06335354
Condition 3
Hydraulic Lock: ON, Float Switch: on
Relays 2, 4 Hydraulic Lock, and Float Mode Ind/Dim on
Float active
Illustration 7 g06335357
Condition 4
Hydraulic Lock: ON, Float Switch: off
Relays 2, 4 Hydraulic Lock, and Float Mode Ind/Dim on
No function active
Illustration 8 g06335358
Condition 5
Hydraulic Lock: Off, Float Switch: on
Relays 2, 4 Hydraulic Lock, and Float Mode Ind/Dim on
No function active
Illustration 9 g06335359
Condition 6
Hydraulic Lock: On, Float Switch: on
Relays Hydraulic Lock and Float Mode Ind/Dim on
No function active
In condition 6, the float switch needs to be toggled to regain float function after hydraulic lock is cycled.
Illustration 10 g06335361
Condition 7
Hydraulic Lock: On, Float Switch: off
Relays 2, 4 Hydraulic Lock, and Float Mode Ind/Dim on
No function active
In condition 7, the float switch resets relay logic in preparation of float solenoid energization.
Illustration 11 g06335363
Condition 8
Hydraulic Lock: on, Float Switch: on
Relays 2, 4 Hydraulic Lock, and Float Mode Ind/Dim on
Float active