9 -2 STEERING
Column Installation P Series..............................................9-58
Column Installation G Series........................................... .9-59
Steering Linkage....................................................................9-59
Tie Rod................................................................................9-59
Relay Rod............................................................................9-62
Idler Arm.............................................................................9-62
Pitman Arm..........................................................................9-62
Steering Connecting Rod...................................................9-63
Power Steering System.........................................................9-63
Power Gear...........................................................................9-63
Pump.....................................................................................9-64
Hoses.....................................................................................9-65
Diagnosis.................................................................................. 9-68
Steering Linkage...................................................................
Manual Steering Gear.......................................................... 9-70
Steering Column (C and K ).................................................. 9-72
Collision Diagnosis............................................................... 9-72
Automatic Column............................................................
Manual Column..................................................................
Tilt Column......................................................................... 9-78
Electrical Analyzer J-23980...............................................
Signal Switch...........................................................................
Power Steering System ........................................................ 9-85
External Leakage................................................................
Special Tools...........................................................................
GENERAL DESCRIPTION
The steering gear is of the recirculating ball type. This
gear provides for ease of handling by transmitting forces
from the wormshaft to the pitman shaft through the use
of ball bearings.
The steering column is connected to the steering gear by
a flexible coupling. This coupling incorporates a
capturing strap which is designed to prevent column-to-
coupling deflection from exceeding the length of the
coupling alignment pins.
The steering columns are new for C and K Series Trucks
but are basically the same as passenger vehicle columns.
The G and P Series trucks use the same type of columns
as in 1972. Optional tilt columns are available for all
Series trucks.
The trucks incorporate “Forward Steering” whereas the
steering linkage is located forward of the front
crossmember. Steering effort is transmitted to left and
right hand adjustable tie rod through a relay rod. The
relay rod is connected to an idler arm on the right and to
the pitman arm on the left.
THEORY OF
STEERING RATIO
The ratio of a steering system is the relationship of
steering wheel movement to that of the front wheels -
that is, the amount, in degrees, that the steering wheel
must be turned to turn the front wheels one degree.
For example, if a truck with power steering has a
steering ratio of 17.5:1, and that is a constant ratio gear,
it is necessary to turn the steering wheel approximately
17.5 degrees for each degree of turn desired.
Part of the ratio is developed in the linkage, but the
greatest part of the overall ratio is developed in the
steering gear itself.
Comparatively, vehicles with manual steering utilize
steering ratios of 24:1 to help minimize the steering
effort.
With variable ratio power steering the steering ratio
varies continuously from a moderate 16.0:1 or 15.0:1 for
straight-ahead driving to a low 13.1:1 in full turns.
From the straight-ahead position, the steering ratio stays
constant for the first 40 degrees of steering wheel
movement, then decreases very gradually at first. This
provides precise steering control for highway driving
with a ratio always higher than 15:1, as passing or even
OPERATION
steering through curves seldom requires more than a
quarter turn of the steering wheel.
When cornering, such as at an intersection, the ratio
spread will be somewhat broader - anywhere between
16:1 and 14.1:1 — as the steering necessary generally
ranges from a half to a full turn of the steering wheel.
While this provides an excellent average cornering ratio
of about 14:1, the most important factor is that the
response increases as the need increases.
The low end of the ratio spread is utilized only near the
extremes of the steering wheel travel-after approx
imately one full turn. Since the steering wheel is
generally turned to its limit only when parking or
backing up, the added maneuverability of these extreme
low ratios is purely a bonus, since directional stability is
not a factor at low speeds.
The design of the sector and rack are responsible for the
steering flexibility.
Notice that the center tooth of the variable ratio sector
(C & K) is longer than the teeth on either side, while all
teeth of the conventional sector (G & P) are of equal
length.
LIGHT DUTY TRUCK SERVICE MANUAL
Summary of Contents for Light Duty Truck 1973
Page 1: ......
Page 4: ......
Page 6: ......
Page 53: ...HEATER AND AIR CONDITIONING 1A 27 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 115: ...LIGHT DUTY TRUCK SERVICE M A N U A L HEATER AND AIR CONDITIONING 1A 89...
Page 123: ...BODY 1B 3 Fig 6 Typical 06 Van LIGHT DUTY TRUCK SERVICE MANUAL...
Page 149: ...BODY 1B 29 Fig 84 Body Mounting 06 Fig 85 Body Mounting 14 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 171: ...LIGHT DUTY TRUCK SERVICE M A N U A L Fig 2 Frame Horizontal Checking Typical FRAME 2 3...
Page 173: ...LIGHT DUTY TRUCK SERVICE M A N U A L Fig 4 10 30 Series Truck Frame FRAME 2 5...
Page 174: ...2 6 FRAME LIGHT DUTY TRUCK SERVICE MANUAL Fig 5 Underbody Reference Points G Van...
Page 185: ...FRONT SUSPENSION 3 11 Fig 16 Toe out on Turns LIGHT DUTY TRUCK SERVICE MANUAL...
Page 224: ......
Page 266: ......
Page 351: ...ENGINE 6 15 Fig ID Sectional View of Eight Cylinder Engine LIGHT DUTY TRUCK SERVICE MANUAL...
Page 375: ...EN G IN E 6 39 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 376: ...6 4 0 ENGINE LIGHT DUTY TRUCK SERVICE MANUAL...
Page 377: ...ENG IN E 6 41 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 378: ...LIGHT DUTY TRUCK SERVICE MANUAL Fig 37L K Series Engine Front Mount 6 42 ENG INE...
Page 400: ...6 6 4 ENG INE LIGHT DUTY TRUCK SERVICE MANUAL...
Page 401: ...ENG IN E 6 65 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 402: ...6 6 6 ENGINE LIGHT DUTY TRUCK SERVICE MANUAL...
Page 403: ...E NG IN E 6 67 Fig 36V C Series Engine Mounts LIGHT DUTY TRUCK SERVICE MANUAL...
Page 410: ......
Page 423: ...EN G IN E C OOLING 6K 13 Fig 16 Overheating Chart LIGHT DUTY TRUCK SERVICE MANUAL...
Page 424: ...6 K 1 4 ENG INE COOLING Fig 17 Coolant Loss Chart LIGHT DUTY TRUCK SERVICE MANUAL...
Page 456: ...6M 32 ENGINE FUEL Fig K15 Accelerator Controls G Van L 6 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 492: ......
Page 512: ...Fig 18e Vacuum Advance Diagram V8 Engine...
Page 516: ...6 T 2 4 E M IS S IO N CONTROL SYSTEMS LIGHT DUTY TRUCK SERVICE MANUAL...
Page 528: ......
Page 590: ......
Page 593: ...CLUTCHES MANUAL TRANSMISSIONS 7M 3 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 598: ...7M 8 CLUTCHES MANUAL TRANSMISSIONS LIGHT DUTY TRUCK SERVICE MANUAL...
Page 642: ......
Page 654: ......
Page 743: ...FUEL TANKS AND EXHAUST 8 13 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 744: ...8 14 FUEL TANKS AND EXHAUST LIGHT DUTY TRUCK SERVICE MANUAL...
Page 760: ...8 30 FUEL TANKS AND EXHAUST Fig 40 Exhaust Pipe P Models LIGHT DUTY TRUCK SERVICE MANUAL...
Page 761: ...FUEL TANKS AND EXHAUST 8 31 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 763: ...FUEL TANKS AND EXHAUST 8 33 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 766: ......
Page 832: ...LIGHT DUTY TRUCK SERVICE MANUAL Fig 106 Power Steering Pump Mounting Typical 9 66 STEERING...
Page 833: ...PUMP ASSEMBLY STEERING GEAR TYPICAL SMALL V8 TYPICAL LARGE V8 STEERING 9 67...
Page 861: ...STEERING 9 95 Fig 134 Power Steering Pump Leakage LIGHT DUTY TRUCK SERVICE MANUAL...
Page 864: ......
Page 876: ......
Page 886: ...11 10 CHASSIS SHEET METAL LIGHT DUTY TRUCK SERVICE MANUAL...
Page 891: ...ELECTRICAL BODY AND CHASSIS 12 5 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 934: ......
Page 942: ......
Page 970: ......
Page 972: ......
Page 974: ......
Page 976: ...V...
Page 978: ......
Page 979: ......