SPRING 0993341 - Caterpillar

Procedure
Illustration 1 g01043184
Hoist control valve
(1) Hoist proportioning solenoid for SNUB, FLOAT, and LOWER
(2) Hoist proportioning solenoid for RAISE
Install a multimeter in series with hoist proportioning solenoid (1).
Install a multimeter in series with hoist proportioning solenoid (2).
Move the hoist control lever to the HOLD position and start the engine. Record the readings on both multimeters.
Move the hoist control lever to the RAISE position and start the engine. Record the readings on both multimeters. Raise the dump body to the dump position.
Move the hoist control lever to the LOWER position and start the engine. Record the readings on both multimeters.
As the dump body is lowering, release the hoist control lever. Record the readings on both multimeters. The recorded values are for the FLOAT position.
When the dump body contacts the frame, record the readings on both multimeters. The recorded values are for the SNUB position.
Disconnect both of the multimeters.
Compare the recorded values with the values in Table 1.
Table 1
Hoist Control Valve Solenoid (1) Solenoid (2)
HOLD 0 amp 0 amp
RAISE 0 amp 1.9 amp
LOWER 1.9 amp 0 amp
FLOAT 1.55 amp 0 amp
SNUB 0.775 amp 0 amp Problem: The values do not match the table.
Probable Cause
The hoist control position sensor is not sending the correct signal to the Power Train/Chassis Electronic Control Module (Power Train/Chassis ECM). Use the Caterpillar Monitoring System to view the input signal to the Power Train/Chassis ECM.
The Power Train/Chassis ECM is not sending the correct signal to the hoist proportioning solenoids. Use the Caterpillar Monitoring System to view the output signal from the Power Train/Chassis ECM.
The hoist proportioning solenoid or the wiring from the Power Train/Chassis ECM has failed.Note: The Electronic Technician (ET) can also be used to view the input to the Power Train/Chassis ECM. The Electronic Technician (ET) can also be used to view the output from the Power Train/Chassis ECM.