TRACK GP 1Q4938 - Caterpillar

Personal injury or death can result if two persons are not used in the following procedure.
Personal injury or death can result from machine articulation or movement.Machine frames can move and a person can be crushed.Connect the steering frame lock link between the front and rear frames before working on machine.
Personal injury can result from hydraulic oil pressure and hot oil.Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.Make sure all of the attachments have been lowered, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.
Specifications
Table 1
Pilot Pressure
Item Setting Actual
Pilot pressure low idle 3000 200 kPa (435 29 psi) Introduction
This information contains the following test:
Pilot System Pressure - TestRequired Tools
Illustration 1 g03590861
Table 2
Tool Item Qty Part No Description
A 198-4240 Digital Pressure Indicator Gp
A1 1 198-4234 Digital Indicator
A2 1 198-4237 Pressure Sensor Gp
(0 kPa to 3,445 kPa (0 psi to 500 psi))
A2 1 198-4238(1) Pressure Sensor Gp
(0 kPa to 34,450 kPa (0 psi to 5,000 psi))
A2 1 198-4239 Pressure Sensor Gp
(0 kPa to 41,368 kPa (0 psi to 6,000 psi))
A2 1 251-9600(2) Pressure Sensor Gp
(0 kPa to 68,900 kPa (0 psi to 10,000 psi))
A3 1 198-4236 Adapter Cable As
(1) This sensor must be purchased separately. The sensor is not included in the 198-4240 Digital Pressure Indicator Gp
(2) This sensor can only be used on large diameter pressure taps like 6V-3965 Fitting.Test Preparation
Refer to "Machine Preparation for Testing and Adjusting".Refer to Testing and Adjusting, "System Pressure-Release".Pilot System Pressure - Test
Move the machine to a smooth level area that will support the weight of the machine.
Move the steering frame lock into the LOCKED position.
Place transmission in NEUTRAL position.
Engage the parking brake.
Lower work tool to the ground
Stop engine.
Relieve pressure on the hydraulic system. For more information about relieving the hydraulic pressure refer to Testing and Adjusting, "System Pressure-Release" for the machine being serviced.
Illustration 2 g03601638
Pilot pressure tap is on the pilot valve on the right-hand side of the machine under the cab.
Install Tooling (A) onto the pilot valve test tap using a gauge rated at 5000 kPa (725 psi).
Start the engine and warm hydraulic fluid up to normal operating temperature of approximately 50° C (122 ° F) to 65° C (149 ° F)Note: The hydrostatic pump charge circuit provides pressure to the pilot manifold. The pilot manifold contains a pressure reducer that limits the pilot supply to the pilot, diff. lock, and clutch services.
Run the machine at low idle.
Record the pressure registered.
Compare recorded pressure against specification in Table1.
If the charge pressure is within specification, stop the engine.
Remove test equipment.
If the charge pressure is not within specification, refer to Testing and Adjusting, "Hydrostatic System-Test and