Chevrolet 10 Series 1970 Service Manual page 139

General Description 10-60 Series Truck
Fram e Alignm ent ....................................................................................... 2-1
Horizontal C h e c k ..................................................................................... 2-2
Vertical C h e c k .................................................................................. ....... 2-2
Ligh t duty 10-30 S eries fra m es a re o f the ladder
channel section riv e te d type.
fra m e s are o f channel section design.
F igu res 1 and 2 illu strate typical light and heavy duty
fra m e s with cro ssm em b ers, body mounts and suspension
attaching brackets. T h is
instructions fo r checking fram e alignm ent and re c o m ­
mendations on fram e re p a ir.
FRAME ALIGNMENT
H orizon tal fram e checking can be made with tra m ­
m ing gauges applied d ire c tly to the fram e or by tra n s­
fe r r in g selected points o f m easurem ent from the fram e
to the flo o r by means o f a plum bob and using the flo o r
layout fo r m easuring. Figu re 3 may be used as a gen­
e r a l guide in the selection o f checking points; how ever,
selection o f these points is a rb itra ry depending on a c ­
c e s s ib ility and convenience.
m em ber is that fo r each point selected on one side of the
fra m e , a corresponding point on the opposite side o f the
fra m e must be used fo r v e rtic a l checks, opposite and
altern ate sides fo r horizontal checks.
Fig . 1 - 1 0 - 3 0 Series Frame—T y p ic a l
SECTION 2
FRAME
.......................................... ....... 2-1
GENERAL DESCRIPTION
Heavy duty 40-60 S eries
section also included general
An im portant point to r e ­
INDEX
Frame Repair ...................................................................................... ........2-2
Welding .....................................................................................................2-2
B o lt in g ............................................................................................... ........2-2
Frame Dimensions Drawings and C h a r t s ....................2-3 through
Vehicle Preparation
Points to rem em ber when preparing veh icle fo r fram e
checking:
1. P la ce v eh icle on a le v e l surface.
2. Inspect damaged area s fo r obvious fram e m isa lign ­
ment to elim inate unnecessary m easuring.
3. Support veh icle
p a ra lle l to the ground.
Tramming Sequence
1. Dim ensions to bolts and/or holes in fra m e extend to
dead center o f the hole or bolt.
2. Dim ensions must be within 3/16".
3. If a tram bar is used, fo r horizontal alignment
'•'X" - check fro m opposite and alternate referen ce
points A A , BB and CC, as illu strated by the lin es in
Figu re 3. E r r o r w ill resu lt if a tram bar is not le v e l
and centered at the refe re n c e points.
4. Obtain v e rtic a l dim ensions and com pare the d iffe r ­
ences between these dimensions with the dim ensions
as shown in chart.
Fig . 2 - 4 0 - 6 0 Series Frame—T y p ic a l
so that fram e sidem em bers a re
CHEVROLET TRUCK SERVICE MANUAL
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