BobCat 753 – CHARGE PRESSURE – Adjusting

If the charge pressure is not correct loosen the charge relief valve plug (Item 1) [Figure 30-30-2].

Assemble: Always use a new O-ring. Tighten the plug to 30-50 ft.-lbs. (41-68 Nm) torque.

Remove the plug, spring and poppet [Figure 30-30-3].

Check the poppet and spring for wear or damage.

There are several different thickness of the shims (Item 1) [Figure 30-30-4] and are used to adjust the charge
pressure.

NOTE: 0.010 inch (0,254 mm) is 8 PSI (55.16 kPa) increase in pressure.

The charge pressure should be set at:

For S/N 515844250 and Above: 240-260 PSI (1379 kPa) with approximately 140°F (49°C) fluid @ 2710-2850 RPM.

For S/N 515844249 and Below: 155-165 PSI (1276-1345 kPa) with approximately 140°F (49°C) fluid @ 2710-2850 RPM.

 

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