A pressure loss due to a worn piston ring or a scored housing bore.

Disassemble the steering gear and replace any affected parts. Refer to Steering Gear Replacement .

Leakage at the valve rings and the valve body at the worm seal.

Disassemble the steering gear and replace the defective seals. Refer to Steering Gear Replacement .

Leakage at the valve body or a loose fitting seal.

Replace the valve.