Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
Fig. 4 Model 605 power steering gear disassembled
There are two types of Saginaw integral rotary valve type single piston steering gears. The two different types of gears can be identified by the
configuration of the side covers. The Model 605 gear has a round side cover, secured with a retaining ring, Fig. 1. The Model 800-808 gear has a
rectangular side cover, secured with four bolts, Fig. 1. Also, note that the Model 800-808 gear incorporates balls in the rack piston, Figs. 2 and 3, while
the Model 605 gear does not, Fig. 4.
The power steering gear operates entirely by displacing oil to provide hydraulic pressure assists only when turning. As the entire gear assembly is
always filled with oil, all internal components of the gear are immersed in oil, making periodic lubrication unnecessary. In addition this oil acts as a
cushion to absorb road shocks that may be transmitted to the driver.
The steering shaft, hydraulic valve, worm and rack piston nut are all in line, making a compact and space saving steering gear. All oil passages are
internal except the pressure and return hoses between gear and pump.
