There are four replenishing/high pressure relief valves (Item 1) [Figure 30-50-1] in the hydrostatic pump assembly. Two are located at the top of the pumps and two at the bottom of the pumps.
NOTE: The two top valves are for the reverse drive loop and the two bottom valves are for the
forward drive loop.
Remove the replenishing/high pressure relief valve (Item 1) [Figure 30-50-2] from the pump.
Assembly: Tighten the plug to 30 – 50 ft.-lb. (41 – 68 N•m) torque.
Check for damage and replace as needed.
Check the O-ring (Item 2) [Figure 30-50-2] for damage and replace as needed.
If the replenishing/high pressure relief valve must be replaced, it must be replaced as a complete unit.
The pressure setting for a new replenishing/high pressure relief valve is 5000 PSI (345 bar).