GMC 4000 Series Service Manual page 328

Section
Gasoline Engine
Accelerator and Throttle Linkage Adjustment
Air C l e a n e r s ......................................................................................
Fuel Filters
Fuel Pump
G overn ors.............................................................................................
Rochester Carburetor
Bendix-Stromberg Carburetors
Exhaust Em ission Control Systems
Controlled Combustion System - M o d ifie d .........................
Air Injection Reactor S y s t e m ...................................................
D iesel E n g in e ..........................................................................................
Accelerator and Throttle Linkage Adjustment
Air C l e a n e r s ......................................................................................
Fuel Filters
Fuel Injection System (Toro-Flow Engine)
Service O p e r a tio n s...........................................................................
ACCELERATOR AN D THROTTLE LINKAGE ADJUSTMENT
Adjustment of accelerator linkage is accom­
plished by adjusting length and travel of the accel­
erator rods. The carburetor throttle plate should
be in fully-open (full throttle) position when pedal
is held completely down in contact with floor mat
or pedal stop.
IMPORTANT: Accelerator pedal should contact
floor or pedal stop at same time throttle shaft
lever contacts the lever stop. DO NOT FORCE
THROTTLE LEVER BEYOND LIMITS OF NORMAL
TRAVEL.
When accelerator linkage is properly adjusted,
the carburetor throttle plate will completely close
carburetor throat passage when linkage is in idle
position and the carburetor idle speed screw is
turned out beyond point of contacting throttle stop.
Linkage adjustment procedure for specified
engines or models are as follows:
MODEL PS4500
(Refer to Figure 1)
1. Disconnect pull-back spring from throttle
lever.
2. Disconnect relay rod at bell crank.
3. Block accelerator pedal down against pedal
stop.
G M C S E R V I C E M A N U A L
SECTION 6M
Z n c js in e ,
Contents of this section are listed in Index below:
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Q a A o lin e
S u & t& m
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C tu U m i
4. Hold carburetor throttle lever in full throt­
tle position, then adjust length of swivel until re­
lay rod fits freely into bell crank. Lock swivel in
place with clip.
5. Release accelerator pedal and connect pull­
back spring to throttle lever.
Figure 1 - Accelerator Linkage (PS4500)
Sec. 6M
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