BobCat S70 – HYDRAULIC PUMP – Direct Pump Testing

The tools listed will be needed to do the following procedure:

MEL1563 or 6689779 – Remote Start Tool
MEL10003 – Hydraulic Tester
MEL10006 – Hydraulic Test Kit

NOTE: The relief pressure must be per specification before the output test is performed.

Lift and block the loader. (See Procedure on Page 10-10-1.)

Disconnect the OUTLET hose (Item 1) [Figure 20-60-1] from the hydraulic pump. Connect the OUTLET hose from the tester to the hose (Item 1) [Figure 20-60-1].

Connect the INLET hose (Item 2) [Figure 20-60-1] from the tester to the OUTLET fitting on the hydraulic pump.

Open the restrictor control (Item 3) [Figure 20-60-1] fully (counterclockwise) before testing the relief valve.

A sample tester connection is shown in picture [Figure 20-60-2].

Start the engine and run at low RPM. Make sure the tester is connected correctly. If no flow is indicated on the tester, the hoses are connected wrong. With the hoses connected correctly, increase the engine speed to full RPM*.

Warm the hydraulic fluid to 140° F (60° C) by turning the restrictor control (Item 1) [Figure 20-60-1] & [Figure 20-60-2] on the tester to about 1000 PSI (69 bar). DO NOT exceed system relief pressure. Open the restrictor control and record the free flow (GPM) at full RPM.


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