Specification
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| Illustration 1 | g02922896 |
(B) PQ Curve Adjustment (First Stage of Constant Horsepower Control) (C) PQ Curve Adjustment (Second Stage of Constant Horsepower Control) (D) PQ Curve Adjustment (Maximum Output Flow Control) | |
| Approximate Change of Flow with 1/4 Turn of Adjustment Screw | ||
| Item | Adjustment Screw | 1/4 Turn of Adjustment Screw |
| (4) | First Stage of Constant Horsepower Control | 13.5 L/min (3.6 US gpm) |
| (6) | Second Stage of Constant Horsepower Control | 9 L/min (2.4 US gpm) |
| (7) | Maximum Output Flow | 3.3 L/min (0.9 US gpm) |
| Torque Specification | ||
| Item | Part | Torque |
| (3) | Locknut | 100 ± 10 N·m (74 ± 7 lb ft) |
| (5) | Locknut | 45 ± 5 N·m (33 ± 4 lb ft) |
| (8) | Locknut | 125 ± 20 N·m (92 ± 15 lb ft) |
Introduction
Adjust the pump output flow if the flow test results are not within specification. Refer to Illustration 1 for more information on pump output flow adjustments.
ReferenceRefer to Testing and Adjusting, "Main Pump (Flow) - Test (Constant Horsepower Flow Control)" for pump flow specifications.
Adjustment of Pump Output Flow (Constant Horsepower Control)
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| Illustration 2 | g02708477 |
Pump regulator (drive pump) (1) Pump regulator (drive pump) (2) Pump regulator (idler pump) (3) Locknut (4) Adjustment screw (first stage of constant horsepower control) (5) Locknut (6) Adjustment screw (second stage of constant horsepower control) | |
Adjust the flow of the drive pump for the first stage of the constant horsepower control. The idler pump must be at no-load condition.
- Loosen locknut (3) .
- Turn adjustment screw (4) in order to adjust the output flow of the pump. Turning adjustment screw (4) clockwise will increase the output flow of the pump. Turning adjustment screw (4) counterclockwise will decrease the output flow of the pump. A 1/4 turn of adjustment screw (4) will change the output flow of the pump at the following pressure.
- Output flow of the pump will change approximately 13.5 L/min (3.6 US gpm) if the output flow is adjusted in the pressure range of 11800 kPa (1700 psi) to 19600 kPa (2850 psi). The pump is operating in the first stage of the constant horsepower control.
- Output flow of the pump will change approximately 13.5 L/min (3.6 US gpm) if the output flow is adjusted in the pressure range of 11800 kPa (1700 psi) to 19600 kPa (2850 psi). The pump is operating in the first stage of the constant horsepower control.
- Tighten locknut (3) to a torque of 100 ± 10 N·m (74 ± 7 lb ft).
Adjust the flow of the drive pump for the second stage of the constant horsepower control. The idler pump must be at no-load condition.
- Loosen locknut (5) .
- Turn adjustment screw (6) in order to adjust the output flow of the pump. Turning adjustment screw (6) clockwise will increase the output flow of the pump. Turning adjustment screw (6) counterclockwise will decrease the output flow of the pump. A 1/4 turn of adjustment screw (6) will change the output flow of the pump at the following pressure.
- Output flow of the pump will change approximately 9 L/min (2.4 US gpm) if the output flow is adjusted in the pressure range of 27500 kPa (4000 psi) to 34300 kPa (4950 psi). The pump is operating in the second stage of the constant horsepower control.
- Output flow of the pump will change approximately 9 L/min (2.4 US gpm) if the output flow is adjusted in the pressure range of 27500 kPa (4000 psi) to 34300 kPa (4950 psi). The pump is operating in the second stage of the constant horsepower control.
- Tighten locknut (5) to a torque of 45 ± 5 N·m (33 ± 4 lb ft).
Adjust the idler pump in the same manner as the drive pump.
Adjustment of the Maximum Output Flow of the Pump
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| Illustration 3 | g02708768 |
Pump regulator (drive pump) (1) Pump regulator (drive pump) (2) Pump regulator (idler pump) (7) Adjustment screw (maximum output) (8) Locknut | |
Adjust the maximum output flow of the drive pump.
- Loosen locknut (8) .
- In order to adjust maximum output flow, turn adjustment screw (7) . Turning adjustment screw (7) clockwise will decrease the maximum output flow of the pump. Turning adjustment screw (7) counterclockwise will increase the maximum output flow of the pump. A 1/4 turn of adjustment screw (7) will change the maximum output flow approximately 3.3 L/min (0.9 US gpm).
- Tighten locknut (8) to a torque of 125 ± 20 N·m (92 ± 15 lb ft).
Adjust the maximum output flow of the idler pump in the same manner as the drive pump.