BOBCAT S130 – HYDRAULIC PUMP (SJC) – Direct Pump Test (Charge Section)

The tools listed will be needed to do the following procedure:
MEL1563 or 6689779 – Remote Start Tool
MEL10103 – Hydraulic Tester
MEL10106 – Hydraulic Test Kit

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

Raise the lift arms and install an approved lift arm support device. (See Installing on Page 10-20-1.)

NOTE: The fluid from the charge pump must be filtered after it passes through the Hydraulic Tester, to prevent any contamination to the Hydrostatic Pumps.

Raise the operator cab. (See Raising on Page 10-30-2.)

Open the rear door of the loader.

Connect the remote start tool. (See REMOTE START TOOL KIT-MEL1563 on Page 10-60-1.)

Disconnect the proportioning valve electrical connector (Item 1) [Figure 20-70-56].

Remove the tie-strap (Item 2) [Figure 20-70-56] from the electrical harness.

Disconnect the filter inlet hose (Item 1)[Figure 20-70-57].

*Refer to (See Hydraulic System on Page SPEC-10-3.) for system relief pressure and full RPM.

Connect the filter inlet hose (Item 1) to the inlet side of the tester (Item 2) [Figure 20-70-58].

Connect the OUTLET hose (Item 3) from the hydraulic tester to the inlet fitting (Item 4) of the charge filter [Figure 20-70-58].

Be sure all connections are tight and that the hoses are not touching any moving parts before starting the loader [Figure 20-70-59].

Start the engine and run at low idle 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 fluid to 140° F (60° C) by turning the restrictor control (Item 1) [Figure 20-70-59] on the tester to about 600 PSI (41,4 bar). DO NOT exceed 1200 PSI (82,7 bar).
Open the restrictor control and record the free flow (GPM) at full RPM*.

Turn the restrictor down to system operating pressure approximately 1000 PSI (69 bar). DO NOT EXCEED 1200 PSI (82,7 bar). Refer to Hydraulic Schematics for flow. The high pressure flow must be at least 80% of free flow.

A low percentage may indicate a failed pump.
*Refer to the Hydraulic Schematics for pump flow and RPM.


Leave a Reply

Your email address will not be published. Required fields are marked *