CONTROL GP-TRANSMISSION HYD 4458927 - Caterpillar

Table 1
Tools Needed Qty
132-7842 Adapter Cable As 2
Illustration 1 g00532936
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. Record the readings on both multimeters. Raise the dump body to the dump position.
Move the hoist control lever to the LOWER position. 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 2.
Table 2
Hoist Control Lever Solenoid (1) Solenoid (2)
HOLD 0 amp 0 amp
RAISE 0 amp 1.9 amp
LOWER 1.9 amp 0 amp
FLOAT 1.69 amp 0 amp
SNUB 0.81 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 Electronic Control Module (Power Train ECM). Use the Caterpillar Monitoring System to view the input signal to the Power Train ECM.
The Power Train 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 ECM.
The hoist proportioning solenoid or the wiring from the Power Train ECM has failed.Note: The Electronic Technician (ET) can also be used to view the input to the Power Train ECM. The Electronic Technician (ET) can also be used to view the output from the Power Train ECM.