325C Excavator Hydraulic System Pump Control (Output Flow) - Adjust Caterpillar


Pump Control (Output Flow) - Adjust
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1.1. Adjustment of Pump Output Flow (Constant Horsepower Control)
2.1. Adjustment of the Maximum Output Flow of the Pump

Adjust the pump output flow if the flow test results differ greatly from the specifications.

Adjustment of Pump Output Flow (Constant Horsepower Control)




Illustration 1g00817292

Main pump compartment

(20) Adjustment screw

(21) Locknut

(22) Adjustment screw

(23) Locknut

(24) Adjustment screw

(25) Locknut

(26) Adjustment screw

(27) Locknut

Adjust the flow of the right pump for the first stage of the constant horsepower control. The left pump must be at no-load condition.

  1. Loosen locknut (23) .

  1. Turn adjustment screw (22) in order to adjust the output flow of the pump. Turning adjustment screw (22) clockwise will increase the output flow of the pump. Turning adjustment screw (22) counterclockwise will decrease the output flow of the pump. A 1/4 turn of adjustment screw (22) will change the output flow of the pump at the following pressure.

    • Output flow of the pump will change approximately 23 L/min (6.1 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.

  1. Tighten locknut (23) to a torque of 98 ± 9.8 N·m (70 ± 7 lb ft).

Adjust the flow of the right pump for the second stage of the constant horsepower control. The left pump must be at no-load condition.

  1. Loosen locknut (21) .

  1. Turn adjustment screw (20) in order to adjust the output flow of the pump. Turning adjustment screw (20) clockwise will increase the output flow of the pump. Turning adjustment screw (20) counterclockwise will decrease the output flow of the pump. A 1/4 turn of adjustment screw (20) 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.

  1. Tighten locknut (20) to a torque of 28 ± 7 N·m (21 ± 5 lb ft).

Adjust the left pump in the same manner as the right pump. Use locknut (27) and adjustment screw (26) in order to adjust the first stage of the constant horsepower control. Use locknut (25) and adjustment screw (24) in order to adjust the second stage of the constant horsepower control.

Adjustment of the Maximum Output Flow of the Pump




Illustration 2g00817304

Main pump compartment

(28) Adjustment screw

(29) Locknut

(30) Locknut

(31) Adjustment screw

Adjust the maximum output flow of the right pump.

  1. Loosen locknut (30) .

  1. In order to adjust maximum output flow, turn adjustment screw (31). Turning adjustment screw (31) clockwise will decrease the maximum output flow of the pump. Turning adjustment screw (31) counterclockwise will increase the maximum output flow of the pump. A 1/4 turn of adjustment screw (31) will change the maximum output flow approximately 5 L/min (1.3 US gpm).

  1. Tighten locknut (30) to a torque of 177 ± 15 N·m (130 ± 11 lb ft).

Adjust the maximum output flow of the left pump in the same manner as the right pump. Use locknut (29) and adjustment screw (28) in order to adjust the maximum output flow of the left pump.

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