If the charge pressure is not correct loosen the charge relief valve plug (Item 1) [Figure 30-40-6].
Assembly: Always use a new O-ring. Tighten the plug to 30 – 50 ft.-lb. (41 – 68 N•m) torque.
Remove the plug, spring and poppet [Figure 30-40-7].
Check the poppet and spring for wear or damage.
Inspect the seat inside the hydrostatic pump case for wear or damage.
There are several different thickness of the shims (Item 1) [Figure 30-40-8] and are used to adjust the charge pressure.
NOTE: 0.010 in. (0,254 mm) is 8 PSI (0,55 bar) increase in pressure.
The charge pressure should be set at 335 – 385 PSI (23,1 – 26,5 bar).
