Adjust the pump output flow if the flow test results differ greatly from the specifications.
Specification
| Approximate Change of Flow with 1/4 Turn of Adjustment Screw | ||
| Adjustment Screw | 1/4 Turn of Adjustment Screw | Torque for Locknut |
| First Stage of Constant Horsepower Control | 24.5 L/min (6.5 US gpm) | 160 ± 24 N·m (120 ± 18 lb ft) |
| Second Stage of Constant Horsepower Control | 13.2 L/min (3.5 US gpm) | 16 ± 2.4 N·m (12 ± 1.8 lb ft) |
| Maximum Output Flow | 5.5 L/min (1.5 US gpm) | 240 ± 36 N·m (175 ± 27 lb ft) |
Introduction
Adjust the pump output flow if the flow test results differ greatly from the specifications.
Adjustment Procedure
Adjustment of Pump Output Flow (Constant Horsepower Control)
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| Illustration 1 | g01368631 |
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Main pump compartment (1) Adjustment screw (2) Locknut (3) Adjustment screw (4) Locknut (5) Adjustment screw (6) Locknut (7) Adjustment screw (8) Locknut |
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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 (4) .
- Turn adjustment screw (3) in order to adjust the output flow of the pump. Turning adjustment screw (3) clockwise will increase the output flow of the pump. Turning adjustment screw (3) counterclockwise will decrease the output flow of the pump. A 1/4 turn of adjustment screw (3) will change the output flow of the pump at the following pressure.
- Output flow of the pump will change approximately 24.5 L/min (6.5 US gpm) if the output flow is adjusted in the pressure range of 10000 kPa (1450 psi) to 21000 kPa (3050 psi). The pump is operating in the first stage of the constant horsepower control.
- Tighten locknut (4) to a torque of 160 ± 24 N·m (120 ± 18 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 (2) .
- Turn adjustment screw (1) in order to adjust the output flow of the pump. Turning adjustment screw (1) clockwise will increase the output flow of the pump. Turning adjustment screw (1) counterclockwise will decrease the output flow of the pump. A 1/4 turn of adjustment screw (1) will change the output flow of the pump at the following pressure.
- Output flow of the pump will change approximately 13.2 L/min (3.5 US gpm) if the output flow is adjusted in the pressure range of 28000 kPa (4050 psi) to 31000 kPa (4500 psi). The pump is operating in the second stage of the constant horsepower control.
- Tighten locknut (1) to a torque of 16 ± 2.4 N·m (12 ± 1.8 lb ft).
Adjust the idler pump in the same manner as the drive pump. Use locknut (8) and adjustment screw (7) in order to adjust the first stage of the constant horsepower control. Use locknut (6) and adjustment screw (5) in order to adjust the second stage of the constant horsepower control.
Adjustment of the Maximum Output Flow of the Pump
Note: Adjustment screws for maximum output flow for both the drive pump and the idler pump are located on the back side of the pumps.
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| Illustration 2 | g01526725 |
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Top view of main pump compartment (9) Adjustment screw (10) Locknut (11) Locknut (12) Adjustment screw (13) Idler pump regulator (14) Drive pump regulator (15) Pump delivery lines |
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Adjust the maximum output flow of the drive pump.
- Loosen locknut (11) .
- In order to adjust maximum output flow, turn adjustment screw (12) . Turning adjustment screw (12) clockwise will decrease the maximum output flow of the pump. Turning adjustment screw (12) counterclockwise will increase the maximum output flow of the pump. A 1/4 turn of adjustment screw (12) will change the maximum output flow approximately 5.5 L/min (1.5 US gpm).
- Tighten locknut (11) to a torque of 240 ± 36 N·m (175 ± 27 lb ft).
Adjust the maximum output flow of the idler pump in the same manner as the drive pump. Use locknut (10) and adjustment screw (9) in order to adjust the maximum output flow of the idler pump.