Swing Pump Control (Mechanical Zero) - Test and Adjust
This procedure is utilized to set the swing pump swashplate at a zero degree angle. While the swashplate is at the zero degree angle, the pressure in each side of the closed loop swing circuit should equal the swing charge pressure.
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| Required Tools | ||
|---|---|---|
| Part Number | Part Description | Qty |
| 8T-0855 | Pressure Gauge (0 to 4,000 kPa (0 to 580 psi)) | 2 |
| 6V-3989 | Fitting (TEST) | 2 |
| 6V-4143 | Quick Connect Coupler | 4 |
| 6V-3014 | Hose As | 2 |
| 3J-1907 | O-Ring Seal | 2 |
| 5P-2937 | O-Ring Adapter | 2 |
| 6V-3966 | Fitting As | 2 |
- Connect 4000 kPa (580 psi) pressure gauges to pressure taps (8) and (10) .
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 | |
| Illustration 1 | g01207385 |
Tooling Swing Pump (1) 8T-0855 Pressure Gauge (0 to 4,000 kPa (0 to 580 psi)) (2) 6V-3989 Fitting (TEST) (3) 6V-4143 Quick Connect Coupler (4) 6V-3014 Hose As (5) 6V-3966 Fitting Assembly (6) 5P-2937 O-Ring Adapter (7) 3J-1907 O-Ring Seal (8) Pressure tap (Swing left) (9) Adjustment screw (10) Pressure tap (Swing right) | |
Note: Begin the check with a 10000 kPa (1450 psi) pressure gauge before the 4000 kPa (580 psi) pressure gauge is connected.
- Place the swing lock pin in the LOCK position.
Note: Machines that are equipped with a fixed cab riser are not equipped with a swing lock pin. Place the swing brake switch in the ON position in order to engage the swing brake.
- Start the engine.
- Place the power mode switch in the Mode P position.
- Adjust the engine speed to position 6 by turning the engine speed dial.
- Check the pressure readings on the gauges at pressure taps (8) and (10). Refer to Testing and Adjusting, "Specifications" in this manual for the correct swing charge pressure.
Note: If the pressures are not to specifications, adjust the swing charge pressure. Refer to Testing and Adjusting, "Relief Valve (Swing Charge Pressure) - Test and Adjust" in this manual. If the pressures at pressure taps (8) and (10) are not equal, adjust the mechanical zero position of the swing pump.
- To adjust the mechanical zero position, loosen the locknut of adjustment screw (9) on the servo valve.
- Turn adjustment screw (9) until the pressure at pressure taps (8) and (10) is equal.
- Tighten the locknut on adjustment screw (9) to the specified torque. Secure the locknut with Loctite.
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