How to Replace a Hydraulic Cylinder Seal How to Replace a Hydraulic Cylinder Seal

The hydraulic cylinder seal is an important part of the suspension of your vehicle. When seals become deffective, they don't hold pressure well and will need to be replaced. The simple step-by-step guide will help you replace the hydraulic cylinders in your vehicle.

Step 1 - Jack Up Vehicle

Use the jack and jack stands to lift the vehicle in the air.

Step 2 - Remove the Tires

Remove the lug nuts and then remove the wheels/tires.

Step 3 - Removing Cylinder Seals

First, find the collar at the bottom of the cylinder which protrudes from the widest part of the cylinder. Unscrew this, and then unbolt the bottom of the cylinder by using a ratchet or wrench. Then, remove the shaft to gain access to the cylinder piston and the seal. Finally, remove each cylinder seal with a flat-head screwdriver.

Step 4 - Install New Cylinder Seals

Install the new seals by pressing them down into the shaft area. Then, divide the seal and spread it around in the base of the cylinder. Use a screwdriver to install poly-pack or rubber seals in the piston areas. Finally, press the cylinder piston back into position and tighten the collar. Then, reattach the cylinder to the control arm, put the wheels/tires back on and lower the vehicle.