Remove the four motor cover mounting screws (Item 1) [Figure 20-30-6].
Installation: Tighten the mounting screws to 15 – 20 ft.-lb. (20 – 27 N•m) torque.
Clean the area around the control valve. Loosen and remove the main relief valve (Item 1) [Figure 20-30-7].
Remove the O-rings and back-up washers [Figure 20-30-5].
Clean the main relief valve in clean solvent. Use air pressure to dry the valve.
Install new O-rings and back-up washers. Install the main relief valve (Item 1) [Figure 20-30-7] and tighten. Check the pressure again.
Installation: Tighten the main relief valve to 35 – 40 ft.-lb. (47 – 54 N•m) torque.