GMC 4000 Series Service Manual page 497

Sec. 9A
Page 486
MECHANICAL STEERING
TRUCK MODELS
Steel Tilt Cab Models......................................................................................................
PS4500
EM4500, 5500, 6500 ........................................................................................................
ES4500,5500 .................. .................................................................................
SM/SS5500; SM6500 ..................................................................................
EG/SG5500; EG6500.........................................................................................................
*Mark on worm shaft should be located, as described to position steering gear in straight ahead position.
WORM BEARINGS
Pull to keep wheel moving..............................................................................................................................................................................................l
SECTOR GEAR LASH:
Pull over center.............................................................................................................................................................................................................2% to 3'/4 lbs.
Lash Adjuster Shim Thickness........................................................................................................................................................0.063", 0.065", 0.067", 0.069"
LOCATION
Steering Gear
Lash Adjuster Screw............................................................................................................................................
Side Cover to Housing.........................................................................................................................................
Worm Bearing Adjuster Screw...........................................................................................................................
Back-Up Adjuster (Tilt Cab Models)................................................................................................................
Steering Wheel-to-Steering Shaft
Steering Wheel-to-Steering Shaft..........................................................................................................................
E and S Models..................................................................................................................................................... ......................................... 40-50
Tilt Cab Models.............................................................................................................................................................................................. 45-50
PS4500.................................................................................................................................................................... ......................................... 35-45
Steering Column Clamp Bolt
Tilt and Conventional Cab Models....................................................................................................................
Cowl Models...........................................................................................................................................................
PS4500....................................................................................................................................................................
Steering Column U-Bolt Nut (E Models)..............................................................................................................
Steering Shaft "STOP" Clamp Bolt
Tilt Cab Models.....................................................................................................................................................
E, S Models............................................................................................................................................................
PS4500.....................................................................................................................................................................
Steering Shaft-to-Worm Shaft Clamp Bolt
Tilt Cab and Cowl Models...................................................................................................................................
PS4500....................................................................................................................................................................
Steering Shaft Coupling-to-Worm Shaft Clamp Bolt
Cowl Models...........................................................................................................................................................
Steering Gear-to-Frame Bolt
Tilt Cab Models and PS4500..............................................................................................................................
E, S Models............................................................................................................................................................
Pitman Arm-to-Pitman Shaft (All Models)..........................................................................................................
Connecting Rod (Drag Link) Stud-to-Pitman Arm and Steering Arm
Except PS4500.......................................................................................................................................................
PS4500.....................................................................................................................................................................
Steering Arm-to-Tie Rod Stud
F040 Axle................................................................................................................................................................
F055 Axle................................................................................................................................................................
F070 Axle................................................................................................................................................................
Steering Tie Rod Clamp Bolt
F040 Axle...............................................................................................................................................................
F055 Axl6...............................................................................................................................................................
F070 Axle.................................' ..............................................................................................................................
Steering Arm-to-Steering Knuckle Stud
F040 Axle...............................................................................................................................................................
F055 Axle...............................................................................................................................................................
F070 Axle...............................................................................................................................................................
(1) NOTE: All tapered studs must be clean and dry.
(2) Tighten as indicated, then tighten to next notch to insert cotter pin.
G M C S E R V I C E M A N U A L
MECHANICAL STEERING SPECIFICATIONS
STEERING GEAR APPLICATION CHART
.......................................
STEERING GEAR ADJUSTMENTS
TORQUE SPECIFICATIONS
GEAR GEAR
MODEL RATIO
553-D-17 28.14 to 1
549-D-99 28.14 to 1
549-D-191 28.14 to 1
549-D-191 28.14 to 1
549-D-191 28.14 to 1
549-D-193 28.14 to 1
TYPE OF TORQUE (1)
PART
Nut
Bolt
Nut
Nut
Bolt
Bolt
Nut
Nut
Nut
Nut
Nut
Nut
Nut
Bolt
Nut
Nut
Nut
Nut
Nut
Nut
Nut
Nut
Nut
Nut
Nut
Nut
Nut
Nut
CENTER*
POSITION
6 O'Clock
6 O'Clock
8 O'Clock
8 O'Clock
8 O'Clock
8 O'Clock
x / 2
to 2 lbs.
FT. LBS.
25-35
25-35
70-100
30-50
Nut
15-20
20-25
8-12
6-8
5-6
15-20
8-12
40-50
30-40
35-40
90-110
50-60
185-215
125-150 (2)
40 (2)
100-110(2)
150-160 (2)
230-250 (2)
25-35
45-55
80-100
65-95 (2)
115-165(2)
180-240 (2)