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SPOOL AS 2500697 - Caterpillar



2500697 SPOOL AS Caterpillar parts SPOOL
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71
Alternative (cross code) number:
CA2500697
250-0697
2500697
Caterpillar 2500697 SPOOL AS

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Test Procedure - Load Sensing Signal, Pump Discharge Pressure, and Margin Pressure
Start the engine. Warm the hydraulic oil to a minimum temperature of at least 65° C (150° F).
Operate the engine at HIGH IDLE. Make sure that the steering control lever is in the NEUTRAL position.
Start with the blade at ground line level or above and raise the blade.Note: The bulldozer control lever should be moved to about 25% of the total travel distance.
Record the pressure of the load sensing signal at pressure tap (HB) as the blade is being raised.
Record the pump discharge pressure at pressure tap (HA) as the blade is being raised.
Add 2140 340 kPa (310 49 psi) (margin pressure) to the pressure value that was obtained in Step 4 (load sensing signal).
The pump discharge pressure (HA) that was recorded in Step 5 should be equal to the pressure of the load sensing signal (HB) plus margin pressure. Margin pressure is equal to the spring force of the margin spring that is in the flow compensator valve.
If the margin pressure is within the specified limit, the test is complete.
If the margin pressure is not within the specified limit, perform the adjustment procedure in "Adjustment Procedure - Margin Pressure".Adjustment Procedure - Margin Pressure
Perform the Steps in "Test Preparation - Load Sensing Signal, Pump Discharge Pressure, and Margin Pressure" and then continue to the following Step.
Illustration 3 g06148986
(8) Control valve
(9) Locknut
(10) Adjustment Screw
Loosen locknut (9) while you hold adjustment screw (10) in place.
Turn adjustment screw (10) clockwise to increase the margin pressure. Turn adjustment screw (10) counterclockwise to decrease the margin pressure. If the margin pressure is within the specified limit, tighten locknut (9) while you hold adjustment screw (10) in place.
Perform the steps in "Test Preparation - Load Sensing Signal, Pump Discharge Pressure, and Margin Pressure" to check the margin pressure.
If the margin pressure is within the specified limit, tighten locknut (9) while you hold adjustment screw (10) in place.Note: If pressure is not within specified limit, repeat procedure starting at step 2.
Check the margin pressure again. If the margin pressure is within the specified limit, the adjustment procedure is complete.Test Preparation - High-Pressure Cutoff
Perform the steps 1 through 6 in the "Test Preparation - Low-Pressure Standby" and then continue to the following steps.
Attach tooling (A) to pressure tap (HA). Pressure tap (HA) measures the high-pressure cutoff.Test Procedure - High-Pressure Cutoff
Start the engine. Warm the hydraulic oil to a minimum temperature of at least 65° C (150° F).
Operate the engine at HIGH IDLE. Make sure that the steering control lever is in the NEUTRAL position.Note: Do not hold the machine in the STALL CONDITION for more than 15 seconds at a time.
With the engine at HIGH IDLE, move the ripper control lever to the maximum LIFT position. After the cylinder is at the end of the stroke, the implement pump is at the STALL CONDITION.Note: If the machine is equipped with a ripper or single tilt, stall the implement pump.Note: If the machine is equipped


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