Minimizing Frame Service - GMC G Service Manual

DIAGNOSIS OF THE FRAME (CONT.)
PROBLEM
Buckle 1. The use of equipment such as snow plows for
2. A collision involving the vehicle.
3. A fire involving the vehicle.
4. In addition to these causes, refer to possible
Sidesway 1. A collision involving the vehicle.
2. A fire involving the vehicle.
3. The use of equipment such as snow plows for
4. In addition to these causes, refer to possible
1. A collision involving the vehicle.
Diamond
2. Towing another vehicle with a chain attached to
1. An accident or collision involving the vehicle.
Ttoist
2. Operating the vehicle in very rough terrain.
Improper Tracking 1. Frame is out of alignment.
2. Front or rear axle has shifted.
3. Incorrect wheel alignment may make the vehicle
Cracks In The Web Of 1. Loose crossmember attaching bolts.
The Ralls
2. Concentration of stress that may result from

MINIMIZING FRAME SERVICE

Generally, frame service can be minimized or eliminated
by minimizing the concentration of stress in small areas of
the frame.
1. Vehicles should be used only for those purposes for
which they were designed.
• They should not be overloaded.
POSSIBLE CAUSE
which the frame was not designed.
causes 3 and 4 under "Sag." These may contrib­
ute to "Buckle."
which the frame was neither designed nor prop­
erly reinforced.
causes 3 and 4 under "Sag." These may be
contributing factors.
one corner of the frame.
appear to be tracking incorrectly
many different factors. Refer to "Sag" under
"Diagnosis" previously described in this chart.
Also refer to "Minimizing Frame Damage" and
"Reinforcements" later in this section.
FRAME AND BUMPERS 2A-3
CORRECTION
1-4. Straighten and reinforce the frame as
described later in this section. See
"Straightening Frames" and "Rein­
forcements."
1-4. Straighten and reinforce the frame as de­
scribed later in this section. Refer to
"Straightening Frames" and " Rein­
forcements."
1-2. Straighten and reinforce the frame as
described later in this section. Refer to
" S t r a i g h t e n i n g F r a m e s " and
"Reinforcements."
1-2. Straighten and reinforce the frame as de­
scribed later in this section. Refer to
" S t r a i g h t e n i n g
"Reinforcements."
1. Straighten and reinforce the frame as de­
scribed later in this section.
2. Realign and secure the axle.
3. Align the wheels. Refer to FRONT END
ALIGNMENT (SEC. 3A) of this manual.
1. Replace, or weld and reinforce rail. Ream
bolt holes and replace with larger bolts if
necessary. Retighten bolts.
2. Replace, or weld and reinforce the rail. See
the appropriate heading, later in this section.
They should be loaded evenly; localized loads
should be avoided.
Do not operate the vehicle on extremely rough
terrain.
Take into account the forces that will be placed
on a frame from the operation of equipment
such as snow plows when picking a frame for a
new vehicle or reinforcing a frame.
F r a m e s " and
GMTB-0814-2L