GM Service Manual Online
For 1990-2009 cars only

Object Number: 5857  Size: LF
(1)Housing End Ring
(2)Steering Gear Housing Plug
(3)Housing End Cover O-ring Seal
(4)Power Cylinder Piston Ring
(5)Piston Ring Back-up Seal
(6)Housing Guide Cover Assembly
(7)Steering Gear Stub Shaft Adjuster Nut
(8)Steering Gear Housing Cover Bolt
(9)Housing Side Cover Seal
(10)Pitman Shaft Gear
(11)Steering Gear Rack Plug
(12)Steering Gear Rack w/Piston
(13)Gear Worm Balls
(14)Steering Gear Ball Retaining Guide
(15)Steering Gear Ball Retaining Guide Clamp
(16)Steering Gear Ball Retaining Guide Clamp Bolts
(17)Steering Gear Housing
(18)Housing Valve
(19)Thrust Bearing Race
(20)Lower Thrust Bearing
(21)Thrust Bearing Race
(22)Steering Worm
(23)Steering Gear Pitman Shaft Bearing
(24)Pitman Shaft Oil Seal
(25)Pitman Shaft Seal Back-up Washer
(26)Steering Gear Pitman Shaft Seal
(27)Pitman Shaft Seal Back-up Washer
(28)Retaining Ring
(29)Pitman Arm Washer
(30)Pitman Arm Nut
(31)Stub Shaft Seal
(32)Stub Shaft
(33)Valve Spool
(34)Spool Seal
(35)Valve Body
(36)Valve Body Seal
(37)Valve Body Ring
(38)Valve Body Seal
(39)Valve Body Ring
(40)Valve Body Seal
(41)Valve Body Ring
(42)Adjustable Bearing Retainer
(43)Thrust Bearing Spacer
(44)Upper Thrust Bearing Race
(45)Valve Assembly Bearing
(46)Thrust Bearing Race
(47)Adjuster Plug Seal
(48)Adjuster Plug
(49)Steering Gear Stub Shaft Bearing
(50)End Plug Stub Shaft Oil Seal
(51)Stub Shaft Seal
(52)Retaining Ring
(53)Steering Gear Rack Adjuster Nut

The 708 Series Saginaw power steering gear has a recirculating ball system. The ball system acts as a rolling thread between the worm shaft and the rack piston. The following items support the worm shaft:

    • A thrust bearing preload
    • 2 conical thrust races at the lower end
    • A bearing assembly in the adjuster plug at the upper end

The rack piston moves up in the gear when the worm shaft turns right. The rack piston moves down in the gear when the worm shaft turns left. The rack piston teeth mesh with the sector. The sector is a part of the pitman shaft. Turning the worm shaft turns the pitman shaft. The pitman shaft turns the wheels through the steering linkage.

The control valve in the steering gear directs the power steering fluid to either side of the rack piston. The rack piston converts the hydraulic pressure into a mechanical force. If the steering system becomes damages and loses the hydraulic pressure, the vehicle may be controlled manually.

Model 710


Object Number: 313985  Size: LH
(1) Lockwasher/Screw Assembly
(2)Ball Clamp
(3)Ball Return Guide
(4)Balls
(5)Piston
(6)Seal
(7)Seal
(8)Retaining Ring
(9)Plug
(10)Ring
(11)Plug
(12)Pitman Shaft
(13)Adjuster Screw
(14)Bearing
(15)Seal
(16)Side Cover
(17)Bolt
(18)Nut
(19)Housing
(20)Connectors
(21)Seal
(22)Seal
(23)Ring
(24)Seal
(25)Bearing Retainer
(26)Spacer
(27)Race
(28)Bearing
(29)Race
(30)Seal
(31)Adjuster Plug
(32)Bearing
(33)Seal
(34)Washer
(35)Retaining Ring
(36)Nut
(37)Stub Shaft
(38)Valve Body
(39)Seal
(40)Worm Shaft
(41)Races
(42)Bearing
(43)Races
(44)Rack Piston
(45)Plug
(46)Seal
(47)Ring
(48)Seal
(49)Plug
(50)Retaining Ring
(51)Seal
(52)Plate
(53)Seal
(54)Relief Valve
(55)Dust Seal
(56)Retaining Ring
(57)Washer
(58)Seal
(59)Bearing

The 710 Series Saginaw integral power steering gear has a constant 17.5 to 1 ratio. The integral power steering gear has an open-center, rotary-type, 4-way control valve. The control valve directs the oil to either side of the rack piston. The rack piston converts the hydraulic power into mechanical output. This gear is provided with a 14,500 GVW and a 16,000 GVW motorhome chassis.