DISASSEMBLY
(First Series)

1. Mark the cylinder shells, center plate and hydraulic cylinder with a center punch or scriber so that those parts can be reassembled in their original relative positions.

2. Remove the through-bolts which hold the cylinder shells and center plate together.

3. Remove the hydraulic juniper line which runs from the control valve to the hydraulic cylinder.

4. Loosen the hose clamps and loosen the hoses by turning them slightly with pliers.

5. Separate the cylinder shells from the center plate. See Fig. 7. Tap with a rawhide mallet if the parts stick together. Hold the unit over a pail to catch the oil as the parts are separated.

6. Remove the hydraulic cylinder by taking out the four cap screws which hold it lii place. See Fig. 8.

7. Remove the end plug from the hydraulic cylinder, Fig. 9, after which the hydraulic piston and related parts can be removed.

8. Compress the power cylinder piston release spring and hold it in the compressed position by inserting a pin through the port holes in the piston rod as illustrated in Fig. 10. The spring is to be held compressed in this manner while disassembling the rear piston. As in other power units, the piston rod (push rod) end of the Hydrovac is referred to as the rear, regardless of the position of the unit on the vehicle.