BELT 2Y4348 - Caterpillar

Radiator Compartment
(10) Plug.a. 6000 kPa (870 psi) gauge and tee at pressure tap (21) on the pilot manifold (20).b. Test line and 60000 kPa (8700 psi) gauge at pressure tap (5) for front pump output.c. Test line and 60000 kPa (8700 psi) gauge at pressure tap (6) for rear pump output.d. 6V3121 Multitach Group (23).e. Disconnect line (7) from the pump. Plug line (7) and leave port (15) open to the air.f. Disconnect power shift line (19) from the power shift port (16). Plug the line. Install a cap on the power shift port. Connect test line (20) between tee at tap (21) on the pilot manifold and power shift port (16) on the right side of the pump.g. Disconnect pump output line (1). Install plug (14) in the line. Remove plug (10) from the return line located in the radiator compartment. Install flow meter (13) and test hoses (12) and (9) from the pump to return line. Make sure the flow meter is fully open before proceeding.
Flow Meter (Typical Illustration)4. Put mode selector switch in Mode III position and turn AEC switch off.5. Start the engine and increase the temperature of the hydraulic oil to 45 to 55°C (115 to 130°F) by stalling an implement circuit using the pilot control lever. Approximately every 30 seconds, operate the implement to a different position to circulate the oil.Test
To prevent personal injury or equipment damage from failure of the flow meter or associated circuit components because of blocked pump flow, make sure before starting the engine that the flow meter valve is fully open (turned counterclockwise).
To prevent personal injury and/or equipment damage from failed lines or components while the flow meter is returned to the open flow position after a flow test, slowly open the flow meter valve and monitor pump flow at the same time to make sure flow increases. If pump flow does not increase as the flow meter is opened, shut the engine off and determine what is causing the pump not to upstroke.
1. Start the engine. Adjust pilot relief pressure to 2050 kPa (300 psi).2. Slowly close the flow meter valve and record the temperature, RPM and flow at each of the following pressures:
Hydraulic Horsepower CurveHorsepower Control Characteristics Adjustment (Front Pump)
Adjustment Screws (Viewed From Left Side)
(25) Front pump horsepower control. (26) Front pump minimum flow. (27) Rear pump horsepower control. (28) Rear pump minimum flow.Loosen the locknut for horsepower control screw (25). Turn adjustment screw (25) clockwise to increase flow rate. A quarter turn of the screw changes the flow approximately 35 liter/min. (9.2 U.S. gpm). To adjust horsepower control characteristics for the rear pump, follow the same procedure as for the front pump.Maximum Flow Adjustment (Front Pump)
Adjustment Screws (Viewed From Right Side)
(29) Front pump. (30) Rear pump.Maximum flow should be 235 3 liter/min. (62 1.3 U.S. gpm). If flow is out of specification, follow the procedure below.1. Loosen the locknut for screw (29).2. Turn adjustment screw (29) clockwise to decrease and counterclockwise to