Hydro-Boost Assembly

Fig. 2 Removing Accumulator:

Fig. 3 Typical Hydro-Boost Unit Disassembled:

DISASSEMBLY

1. Place accumulator compressor tool No. J-26889 or equivalent, around the end of accumulator, and install nut onto stud as shown in Fig. 2, then depress the accumulator with a C-clamp.
2. Remove retainer by using a suitable punch.
3. Release the C-clamp and remove accumulator compressor tool No. J-26889 or equivalent.
4. Remove accumulator, O-ring, retainer, plug and spring as shown in Fig. 3.
5. Remove retainer, output pushrod, baffle, piston return spring and retainer.
6. With a suitable saw, cut off the eyelet of the pedal rod, then remove the boot.
7. Remove nut, bracket and bolts, then separate cover from housing.
8. Remove piston assembly and seals.
9. Remove spool valve, then with a wire hook remove accumulator valve.
10. Remove return line fitting and seal.

Fig. 4 Spool valve inspection:

CLEANING/INSPECTION

1. Clean all parts in a suitable solvent being careful to avoid losing small parts.
2. Inspect valve spool and valve spool bore in booster housing for corrosion, nicks, scoring or other damage. Discoloration of the spool or bore, particularly in the grooves, is not harmful.
3. If the valve spool or the spool bore has nicks or scoring that can be felt with a fingernail, particularly on the hands, the spool and housing should be replaced as an assembly, Fig. 4. The clearance between the valve spool and the spool bore of the housing is important. Because of this, the spool and housing make are made as a selective assembly and therefore can only be replaced as an assembly.
4. Inspect the input rod and piston assembly for corrosion, nicks, scoring or excessive wear. If the piston is damaged, the input rod and piston assembly should be replaced.
5. Inspect piston bore in booster housing for corrosion, nicks, scoring or other damage. If the bore is damaged, the valve spool and housing should be replaced as an assembly.


ASSEMBLY

Lubricate all the seals and metal friction points with power steering fluid.

1. Install return line seal, then the fitting Fig. 3.
2. Install accumulator valve and spool valve into housing.
3. Install seal on piston assembly using seal protector tool No. J-25083 or equivalent.
4. Install seal onto the housing, then install cover and bolts. Torque housing bolts to 22 ft. lbs.
5. Install bracket and nut, then torque to 110 ft. lbs.
6. Install boot, output pushrod, baffle, piston return spring, and retainer using seal protector tool No. 2455l or equivalent.
7. Install retainer, spring, O-ring, and plug, using accumulator compressor tool No. J-26889 or equivalent, and C-clamp.
8. Depress the accumulator, then install the retainer and remove C-clamp.
9. Jam nut from the repair kit onto pedal rod, and install eyelet onto pedal rod.
10. Adjust eyelet to required length.