SHIELD GP-TURBOCHARGER 3108024 - Caterpillar

Illustration 5 g03419281
Disconnect hose (3) from the rear pump controller.Note: Leave the pump controller for the rear pump vented to the atmosphere.
Assemble Tooling (F). Install Tooling (F) on the open end of hose (3).
Attach Tooling (B) or the low-pressure side of Tooling (D) to Tooling (F).
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Remove the access cover on the front of the machine.
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Remote pressure taps
(R2) Pilot supply pressure tap
(R5) Implement pump discharge
Attach Tooling (B) or high-pressure side of Tooling (D) to pilot supply tap (R2).
Start the engine. Warm the hydraulic oil to 55° 10°C (131° 18°F).
Operate the engine at HIGH IDLE.
Move the lift control lever to approximately 25% to 33% of the RAISE command. Record the differential pressure on gauge (D7) or Tooling (B) while the bucket is still moving into Table 2 of the "Data Sheet". This is the margin pressure for the front hydraulic pump. The margin pressure should be 2800 100 kPa (406 14 psi).
If margin pressure is not within specifications, perform the steps in "Adjustment Procedure (Margin Pressure Valve Spool)".
Detach Tooling (B) or the low-pressure side of Tooling (D) from Tooling (F).
Remove Tooling (F). Reconnect hose (3) to the rear pump controller.
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Disconnect hose (3) and hose (4) from the front pump controller.Note: Leave the pump controller for the front pump vented to the atmosphere.
Connect hose (3) to hose (4) with Tooling (G).
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Remove the access cover on the front of the machine.
Illustration 10 g03419227
Remote pressure taps
(R2) Pilot supply pressure tap
(R5) Implement pump discharge
Attach Tooling (B) or the high-pressure side of Tooling (D) to pilot supply tap (R2).
Attach Tooling (B) or the low-pressure side of Tooling (D) to implement pump discharge tap (R5).
Start the engine. Warm the hydraulic oil to 55° 10°C (131° 18°F).
Operate the engine at HIGH IDLE.
Move the lift control lever to approximately 25% to 33% of the RAISE command. Record the differential pressure on gauge (D7) or Tooling (B) while the bucket is still moving into Table 2 of the "Data Sheet". This is the margin pressure for the rear hydraulic pump. The margin pressure should be 2800 100 kPa (406 14 psi).
If margin pressure is not within specifications, perform the steps in "Adjustment Procedure (Margin Pressure Valve Spool)".
Disconnect hose (3) and hose (4) from Tooling (G). Remove Tooling (G).
Reconnect hose (3) and hose (4) to the front pump controller.Adjustment Procedure (Margin Pressure Valve Spool)
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Compensator Valve
(5) Margin pressure valve spool
(6) Locknut
(7) Adjustment screw for the margin pressure valve
(8) Adjustment screw for the cutoff pressure valve
(9) Locknut
(10) Cutoff pressure valve spoolAdjustments to the flow compensator valve can be made on the machine.
Perform Step 1 through Step 12 of "Test Procedure (Margin Pressure)".
Loosen locknut (6). Maintain the position of adjustment screw (7).
Turn adjustment screw (7) clockwise to increase the pressure setting. Turn adjustment screw (7) counterclockwise to decrease the pressure setting.Note: Turn adjustment screw (7) counterclockwise past the desired pressure setting. Then, turn adjustment screw (7) clockwise to the correct pressure setting. This method of adjusting the pressure setting eliminates any movement