963C Track-Type Loader Power Train Pressure Override Valve - Adjust Caterpillar


Pressure Override Valve - Adjust
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963C Track-Type Loader Power Train [RENR5226]
HYDRAULIC SYSTEM
MOTOR GP
963C Track-Type Loader Power Train Pressure Override Valve - Adjust
1.1. Required Tools
2.1. Procedure

------ WARNING! ------

The power train/hydrostatic transmission and the hydraulic system on this machine use the hydraulic tank as a common sump.

When the oil in the power train/hydrostatic transmission and hydraulic system gets hot, it causes the air to expand and build up pressure in the hydraulic tank.

Pressure can remain in the hydraulic tank after the engine and pumps are stopped.

Personal injury can occur if pressure is not released before any service is performed on the power train/hydrostatic transmission or the hydraulic system.

To prevent possible injury, remove the cap from the oil filler tube before any fitting, hose, or component in the power train/hydrostatic transmission or hydraulic system is loosened, tightened, removed, and/or adjusted.

The cap must be replaced when the tests and/or the adjustments are completed.

The bucket and the other attachments must always be flat on the ground before service is performed.

When it is necessary for an attachment to be raised while tests and/or adjustments are being performed, be sure the correct supports are in place. In the case of the bucket, it must be in the full DUMP position.

Move the machine to a location away from the travel of other machines.

Wear the seat belt, and be sure that other personnel are not near the machine when the engine is running and tests or adjustments are being performed.

----------------------


NOTICE

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, "AVSpare Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on AVSpare products.

Dispose of all fluids according to local regulations and mandates.



NOTICE

Keep all parts clean from contaminants.

Contamination of the hydraulic system with foreign material will reduce the service life of the hydraulic system components.

To prevent contaminants from entering the hydraulic system, always plug or cap the lines, fittings, or hoses as they are disconnected. Cover any disassembled components and clean them properly before assembly.

Clean the hydraulic system properly after any major component exchange or especially after a component failure, to remove any contamination.


Required Tools




Illustration 1g00993634

Tooling (A)




Illustration 2g00994822

Tooling (B) and (C)




Illustration 3g00994838

Table 1
Required Tools    
Tool     Item     Part Number     Description     Qty    
(1)     A1     8T-0861     Pressure Gauge (
60000 kPa (8702 psi))    
1    
A2 171-1879     Adapter     1    
A3 187-3547     Fitting     1    
A4 187-3546     Coupler     2    
A5 177-7863     Hose As     1    
B     -     187-3547     Fitting     1    
C     C1     6V-3965     Fitting As     1    
C2 3J-1907     O-Ring Seal     1    
(2)     D1     6V-4144     Coupler     2    
D2 124-1891     Permanent Coupling     2    
D3 122-6887     Hose (3)     1    
D4 5P-3413     Pipe Sealant (4)     1    
( 1 ) Two sets of tooling (A) are required.
( 2 ) Tooling (D) is a hose assembly that needs to be manufactured.
( 3 ) The length of this hose should be approximately 3048 mm (10 ft).
( 4 ) Apply this pipe sealant to the threads of the permanent coupling (D2) .

Procedure

Note: Test gauges may be used in order to perform this procedure. Test gauges will provide an acceptable measurement of the setting of the pressure override valve. However, test gauges will not provide the level of accuracy that is available with DataView. Record the pressure readings with DataView in order to accurately determine the setting of the pressure override valve. The sample rate for recording the pressure is 500 Hz.




    Illustration 4g00994850

    (E) Pressure tap for the right FORWARD drive pressure

  1. Attach a tooling (A) to pressure tap (E).

    Note: If you are using a dataview tool gp, use a 52000 kPa (7500 psi) transducer in place of gauge (A1) .




    Illustration 5g00994863

    (2A) Control line for the right drive motor

    (2B) Control line for the left drive motor

  1. Disconnect control line (2A) and cap the line. Install fitting (C) in this port. Connect one end of hose (D) to the fitting.



    Illustration 6g00994869

  1. Connect the other end of the hose (D) to pressure tap (F). This is the pressure tap for charge pressure.



    Illustration 7g00994872

    This port is labelled with an "M" on the drive motor.

    (G) Actuator pressure gauge port for the right drive motor

  1. Install nipple (B) into actuator pressure gauge port (G) for the right drive motor. Attach tooling (A) to fitting (B) .

    Note: If you are using a dataview tool gp, use a 52000 kPa (7500 psi) transducer in place of gauge (A1) .

  1. Start the engine.

  1. Enter submode 20 in order to engage the brakes.


    NOTICE

    Do not hold the transmission control lever in the full FORWARD or REVERSE position for more than 5 seconds at any one time. Return the lever to the NEUTRAL position for at least 10 seconds in order to prevent extreme overheating of the oil in the drive pumps.



    NOTICE

    Do not stall the implements during hydraulic system warm-up. Stalling the implements causes oil to flow across the relief valve. This can damage the vane-type hydraulic pump when the system is cold. Before you allow the implements to stall, wait until the hydraulic system reaches operating temperature.


  1. Warm the power train system oil to operating temperature. Stall the transmission in five second intervals in order to warm the power train oil to a temperature of 50 °C (122 °F) to 60 °C (140 °F). Wait for ten seconds between each stall of the transmission.

    Note: If you are using DataView, begin recording the data now.

  1. Run the engine at 1500 rpm. Slowly move the speed/direction control lever in the FORWARD direction while you monitor both pressure gauges. When the pressure at port (G) decreases, record the drive pressure at port (E). This is the setting for the pressure override of the drive motor. The correct setting is 41025 ± 517 kPa (5950 ± 75 psi). If the setting is within the specification, proceed to Step 10. Otherwise, proceed to Step 9.

    Note: The pressure at port (G) should stabilize prior to decreasing.

    Note: If you are using DataView, plot a graph of the pressure over time at port (E) and of the pressure at port (G). The setting (H) of the pressure override valve is the pressure at port (E) when the pressure at port (G) begins to decrease. If the plot does not clearly show the pressure decrease at port (G), repeat Step 8.




    Illustration 8g00994878

    This DataView plot shows a setting of 35000 kPa (5075 psi), which is at the maximum limit of the specification.




    Illustration 9g00681203

    (3) Adjustment screw for the pressure override of the right motor

  1. Shut off the engine. Adjust the setting for the pressure override of the drive motor by loosening the locknut and turning adjustment screw (3). Turn the screw clockwise in order to increase the setting. Turn the screw counterclockwise in order to decrease the setting. One full turn will change the pressure by approximately 10400 kPa (1500 psi). Start the engine. Repeat Step 8 and continue to adjust screw (3) until the correct setting is achieved.

  1. Reconnect all tubes and hoses. Perform the procedure for the left drive motor.

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