GMC 4000 Series Service Manual page 24

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Maintenance information on subjects common to all cabs, such as
painting, checking for water and dust leaks, cab alignment, windshield
wipers, and replacement of windshield glass is covered in the "GEN­
ERAL MAINTENANCE" section following. For all other information,
refer to respective cab section as listed in Index below:
Subject
General M a in ten a n ce...........................................................................
Conventional Model Cabs (Includes H e a tin g )................................
Tilt Model Cabs (Includes H ea tin g )..................................................
Body Mountings
Air Conditioning (Conventional Cab Models)
This section includes general maintenance information on subjects
common to all cabs. Subjects are listed in Index below:
Subject
G e n e r a l................................................................................................... ........... 17
Key Inform ation................................................................................................ 17
Exterior M aintenance.......................................................................... ........... 18
Interior M a in ten a n ce.......................................................................... ........... 18
Dust and Water Leaks
Cab Alignment
Straightening
Dinging and Finishing
P a in tin g ................................................................................................... ........... 19
Windshield Glass R ep la cem en t.................................................................... 19
Rear Window R e p la c e m e n t........................................................................... 21
Windshield Wipers
GENERAL
All cab assem blies for models covered by this
manual are of welded steel
box-type cab framing is used to form a str ess-
resistant foundation to fortify cab against twisting
and flexing.
Principle steel panels are lap-jointed and
welded for maximum sealing and structural strength
Further rigidity is achieved by strategically lo­
cated reinforcement braces and brackets. Sturdy
steel door frames serve as upright structural
members for rigid cab side support to assure prop­
er door fit. Heavy-duty hinges assure sa g -r esist­
ant doors while doors are of double-panel con­
struction for extra strength. Primary sheet metal
panels have stamped depressions to minimize cab
drumming and vibration. Sheet metal components
G M C S E R V I C E M A N U A L
SECTION 1
..................................................................................
QeM£A<*l flo-dtf, M aintenance.
.................................................................................. 18
................................................................................................ 19
........................................................................................ ........... 19
.................................................................................. 19
......................................................................................... 21
construction. Heavy
Page No.
.............................
Page No.
receive several protective finishes to provide ample
resistance to rust and corrosion.
Flexible mounts cushion cab assembly against
shock and protect cab panels from stress and
strain. Periodic inspections are recommended to
ensure that all cab mounting bolts and sheet metal
screws are properly tightened.
Refer to LUBRICATION (SEC. 0) for inform­
ation regarding lubrication of cab components
such as door hinges and seat adjuster slid es. In­
formation on sheet metal components used with
conventional cab is described in SHEET METAL
(SEC. 11) of this manual.
KEY INFORMATION
All models have lock cylinders incorporating
coded keyways and keys. The code letter is located
Sec. 1
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