Toro Procedure for Charge Pump P2 Flow, Sand Pro 2020/3020/5020 Hydraulic System Rev. a

Procedure for Charge Pump (P2) Flow:

1.Make sure hydraulic oil is at normal operating tem- perature by operating the machine for approximately 10 minutes.

2.Make sure machine is parked on a level surface with the attachments lowered. Make sure engine is off and the parking brake is engaged.

3.Read Precautions for Hydraulic Testing.

4.Disconnect hose from the T–fitting on the lift valve.

5.Install hydraulic tester (flow meter) in series with the hose from the pump and the T–fitting on the lift valve. Make sure the flow arrow points toward the lift valve and the flow control valve on the tester is fully open.

6.Make sure that traction pedal and lift control lever are in neutral and the parking brake is engaged.

7.After installing hydraulic tester, start engine and run at low idle speed. Check for hydraulic leakage and cor- rect before proceeding with test.

8.Operate engine at full speed (3150 + 50 RPM).

9.Slowly close the flow control valve on the tester until

500PSI is obtained.

10.Verify pump speed is 3150 + 50 RPM with a photo-

tac.

11.Flow indication on tester should be a minimum of 1 GPM (3.8 LPM). Record test results.

12.Open the flow control valve on the tester and shut off engine.

13.If flow is less than 1 GPM or 500 PSI can not be ob- tained, check for restrictions in the pump circuit. If pump circuit is not restricted, repair or replace charge pump (see Hydrostat Service in this Chapter).

14.Disconnect tester from the hose and T–fitting. Re- connect hose to T–fitting.

15.Make sure hydraulic tank is full (see Check Hydrau- lic System Fluid).

Hydraulic Systems

Sand Pro 2020/3020/5020 Page 4 – 25 Hydraulic System (Rev. A)