TURBOCHARGER GP 9Y6274 - Caterpillar

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Specifications
Table 1
Hoist Control Valve Test
Test Specification Actual
Proportional Solenoid Resistance 5 0.3 Ohms at 25 °C (77 °F) Introduction
This story includes the following tests:
Proportional Solenoid Test
Stem Binding CheckRequired Tools
Table 2
Required Tools
Tool Item Qty Tool
G G1 1 257-9140 Digital Multimeter Test Preparation
Move the machine to a smooth, horizontal location that is away from operating machines and away from personnel.
Permit only one operator on the machine. Keep all other personnel away from the machine or in the operator sight.
Rotate the steering wheel to a NEUTRAL position.
Move the transmission control to park to engage the parking brake.
Lower or retract the implements.
Stop the engine.
Turn the key to the ON position, but do not start the engine.
Verify that the implement controls are UNLOCKED.
Move the control levers through the full range of travel several times. Moving the control levers should relieve any pressure that may be present in the implement hydraulic system.
Refer to the Operation and Maintenance Manual for additional machine preparation information.Test Procedure (Proportional Solenoids)
Illustration 1 g06295413
(1) Hoist control valve
(2) Pilot control actuator
(3) Pilot control actuator
Disconnect the wiring harness to the suspected proportional solenoid. Check the resistance between the two pins on each solenoid. The resistance should be 5 0.3 Ohms at 25 °C (77 °F).If the resistance is not 5 0.3 Ohms, replace the proportional solenoid. Refer to Disassembly and Assembly for information on the hoist control valve.If the resistance is 5 0.3 Ohms, proceed to step 2.
Momentarily connect the proportional solenoid to the battery (24 V) and listen for movement of the core of the proportional solenoid. Do not maintain the connection to the battery (24 V) for more than 0.5 second.If the core does not move, replace the proportional solenoid. Refer to Disassembly and Assembly for information on the hoist control valve.
Reinstall any components which were removed from the machine.Check Procedure (Stem Binding)
Illustration 2 g06295413
(1) Hoist control valve
(2) Pilot control actuator
(3) Pilot control actuator
Perform Step 1 through Step 10 from the"Test Preparation" section.
Remove pilot control actuator (2) and pilot control actuator (3). The pilot control actuators are at each side of hoist control valve (1).
Inspect the stem and verify it will slide within the body of hoist control valve (1). Remove the stem from hoist control valve (1) and check for excessive wear or scoring. Also, check the inside hoist control valve (1) for contamination.
Remove any contamination from hoist control valve (1) and from the stem.
If the stem does not slide inside the hoist control valve or if the stem is damaged, the hoist control valve must be serviced.