HEAT EXCHANGER AS. 5N7992 - Caterpillar

Specification
Table 1
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)
Illustration 1 g01368631
Main pump compartment
(1) Adjustment screw
(2) Locknut
(3) Adjustment screw
(4) Locknut
(5) Adjustment screw
(6) Locknut
(7) Adjustment screw
(8) Locknut 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.
Illustration 2 g01526725
Top view of main pump