TAG-IDENTIFICATION 4J6308 - Caterpillar

Flow Adjustment Under Constant Horsepower Control
First Stage
Illustration 1 g00534686
Adjustment of pump flow (first stage) (1) Location of shim (front pump) (2) Location of shim (rear pump)Shim (1) regulates the output flow rate of the front pump during the first stage.Shim (2) regulates the output flow rate of the rear pump during the first stage.Add shims or remove shims in order to obtain the correct flow rate.One shim will change the flow rate approximately 6 L/min (1.6 US gpm) at a pressure range of 14200 kPa (2050 psi) to 20600 kPa (3000 psi).Note: Adding one shim decreases the flow rate. Removing one shim increases the flow rate.Thickness of one shim ... 0.1 mm (0.004 inch)Second Stage
Illustration 2 g00534789
Adjustment of pump flow (second stage) (3) Setscrew (front pump) (4) Locknut (front pump) (5) Setscrew (rear pump) (6) Locknut (rear pump)Setscrew (3) regulates the output flow rate of the front pump during the second stage.
Adjust the front pump.
Loosen locknut (4) .
Turn setscrew (3) until the output flow rate of the pump is adjusted to the correct specification.
Tighten locknut (4) to a torque of 16 2 N m (12 1 lb ft).Setscrew (5) regulates the output flow rate of the rear pump during the second stage.
Adjust the rear pump.
Loosen locknut (6) .
Turn setscrew (5) until the output flow rate of the pump is adjusted to the correct specification.
Tighten locknut (6) to a torque of 16 2 N m (12 1 lb ft).Note: Turning setscrew (3) or setscrew (5) clockwise will increase the output flow of the pump. Turning setscrew (3) or setscrew (5) counterclockwise will decrease the output flow of the pump.Adjustment of the Maximum Output Flow of the Pump
Illustration 3 g00534837
Maximum adjustment of pump flow (7) Setscrew (front pump) (8) Locknut (front pump) (9) Setscrew (rear pump) (10) Locknut (rear pump)
Adjust the maximum output flow of the front pump.
Loosen locknut (8) .
Turn setscrew (7) until the output flow of the front pump is adjusted to the correct specification.
Tighten locknut (8) to a torque of 16 2 N m (12 1 lb ft).
Adjust the maximum output flow of the rear pump.
Loosen locknut (10) .
Turn setscrew (9) until the output flow of the front pump is adjusted to the correct specification.
Tighten locknut (10) to a torque of 16 2 N m (12 1 lb ft).Note: One quarter turn of setscrew (7) or (9) will change the output flow of the pump approximately 6 L/min (1.6 US gpm).Note: Turning setscrew (5) or (9) clockwise will increase the output flow of the pump. Turning setscrew (5) or (9) counterclockwise will decrease the output flow of the pump.