AD30 Underground Articulated Truck Machine Electrical System Hoist Control - Dump Body Caterpillar


Hoist Control - Dump Body
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AD30 Underground Articulated Truck Machine Electrical System [RENR6921]
ELECTRICAL AND STARTING SYSTEM
ELECTRONICS GP-IMPLEMENT
AD30 Underground Articulated Truck Machine Electrical System Hoist Control - Dump Body
AD30 Underground Articulated Truck Machine Electrical System Hoist Control - Ejector Body



Illustration 1g01013166

Hoist control circuit

The components of the hoist control circuit are the hoist control position sensor, the body up/tail gate down indicator, the body position sensor, the hoist lower coil, the hoist raise coil and the Power Train/Chassis Electronic Control Module (Power Train/Chassis ECM).




Illustration 2g00996591

Cab

(1) Hoist control position sensor (behind cover)

Hoist control position sensor (1) is located behind the transmission control console. The hoist control has four positions: LOWER, FLOAT, HOLD and RAISE. The signals from the hoist control position sensor are used by the Power Train/Chassis ECM, which then controls the hoist lower coil and the hoist raise coil. This will raise or lower the dump body.




Illustration 3g00996593

Dash panel

(2) Body up/tail gate down indicator




Illustration 4g00996594

Rear view of machine

(3) Body position sensor




Illustration 5g00996595

Right side view of transmission compartment

(4) Hoist lower coil

(5) Hoist raise coil




Illustration 6g00996863

Front view of cab (front cover plate removed)

(6) Power Train/Chassis ECM

Under certain conditions the Power Train/Chassis ECM neutralizes the transmission. The transmission will only be selectable in FIRST SPEED, SECOND SPEED and THIRD SPEED when the hoist control position sensor is not in the FLOAT position, or the dump body is in the RAISED position. The reverse gear neutralizer function is activated when the hoist control position sensor is in the RAISE position.

With the key start switch in the ON position, 24 volt power is supplied from the batteries via circuit breaker #12 to hoist control position sensor (1), body up/tail gate down indicator (2), and Power Train/Chassis ECM (6). 24 volt power is also supplied via circuit breaker #10 to body position sensor (3) .

When the hoist control position sensor is in the LOWER position, a signal is sent to the Power Train/Chassis ECM. The Power Train/Chassis ECM supplies 1.9 amps of current to hoist lower coil (4) to lower the dump body.

When the hoist control position sensor is in the RAISE position, the Power Train/Chassis ECM supplies 1.9 amps of current to hoist raise coil (5) to raise the dump body.

When the hoist control position sensor is in the HOLD position, neither of the hoist coils are receiving current. The directional spool is now in a NEUTRALIZED position. Hydraulic oil can not flow through the hoist control valve.

Note: The hoist control valve will default to the HOLD position if the key start switch is turned to the OFF position or the ON position, or if a fault has occurred in the hoist control circuit.

When the hoist control position sensor is in the FLOAT position, the Power Train/Chassis ECM supplies 1.55 amps of current to hoist lower coil (4) and 0 amps to hoist raise coil (5). Hoist lower coil (4) moves the directional spool into the FLOAT position.

Table 1
Hoist Coils    
Hoist Control Lever     Lower Coil     Raise Coil    
Hold     0 amp     0 amp    
Raise     0 amp     1.9 amp    
Lower     1.9 amp     0 amp    
Float     1.55 amp     0 amp    

Reference: For more information on the hoist control, refer to Systems Operation, Testing and Adjusting, "Calibration Mode" for the machine that is being serviced.

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