ELECTRONICS GP 4690359 - Caterpillar

Test Preparation - Piston Pump Neutral
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.
Place the steering control lever in the NEUTRAL position.
Engage the parking brake.
Lower the attachments to the ground.
Stop the engine.
Illustration 5 g01411534
Turn screws (2) counterclockwise and remove panel (1).
Illustration 6 g02936476
Connect the communication adapter (B) to service tool connector (E1). Test Procedure - Piston Pump Neutral
Mechanical Adjustment
Perform the steps in the "Test Preparation - Piston Pump Neutral" then continue to the following steps.
Connect one end of Tool (D) to the port (X1) and the other end to port (X2).
Start the engine. Warm the oil to a minimum temperature of 20 °C (68 °F).
Illustration 7 g01425037
Use Cat Electronic Technician (ET) in order to initiate the winch stall test. Select the "Diagnostics" option from the menu. Then, select "Diagnostic Tests" from the drop-down menu. Select "Winch Stall" from the selection menu.
Set the engine speed to high idle.
Illustration 8 g01869684
Bottom view
(5) Locknut
(6) Adjustment screw
Mark the initial position of adjustment screw (6) on the forward pump.
Loosen locknut (5) on adjustment screw (6).
Turn the adjustment screw clockwise until the winch pressure increases by 6895 kPa (1000 psi). Mark this position.
Turn the adjustment screw back to the original position.
Turn the adjustment screw counter clockwise until the winch pressure increases by 6895 kPa (1000 psi). Mark this position.
Position the set screw at the midpoint between the two positions that were marked in Step 8 and Step 10.
Maintain the position of adjustment screw (6) while you tighten locknut (5). Hydraulic Adjustment
Perform the steps in the "Test Preparation - Piston Pump Neutral" then continue to the following steps.
Illustration 9 g03011278
Install Tool (F) in port (X1) and (X2). Connect one end of pressure differential Tool (D) to port (X1) and the other end of pressure differential Tool (D) to port (X2).
Start the engine. Warm the oil to a minimum temperature of 20 °C (68 °F).
Set the engine speed to idle.
Illustration 10 g01869716
Left side view
(7) Adjustment screw
(8) Lock screw
Loosen lock screw (8) while you hold adjustment screw (7).
Adjust the set screw and the pressure MUST be within 0 172 kPa (0 25 psi) of the left travel backward pressure.
Maintain the position of the adjustment screw while you tighten the lock screw. Note: This adjustment is sensitive and the adjustment can easily change as you tighten the lock screw.Note: One-half revolution of adjustment screw (7) is the maximum adjustment. A small amount of movement of the screw makes a large pressure difference.
Remove all of the tooling.
Replace all panels.