Accelerator And Throttle Linkage Adjustment - GMC 4000 Series Service Manual

ACCELERATOR A N D THROTTLE LINKAGE ADJUSTMENT
NOTE: For adjustment of accelerator linkage
on vehicles equipped with Allison Automatic Trans­
m ission, refer to "TRANSMISSION CONTROL
LINKAGE" (SEC. 7A) of this manual.
IMPORTANT
Before making accelerator and throt­
tle linkage adjustment, engine idle should
be set to "Specifications" as indicated in
TO RO-FLOW D IE S E L EN GIN ES (SEC. 6B).
CONVENTIONAL CAB MODELS
Refer to figure 1.
1. Disconnect pull-back spring. Disconnect
accelerator rod from the injection pump throttle
lever.
2. Loosen the jam nut on the accelerator rod.
3. Depress the accelerator pedal to 3/8-inch
from the toe pan.
NOTE: The thickness of floor mat must be
considered.
4. Hold the injection pump throttle lever in
full throttle position, then turn the accelerator rod
until the end of the accelerator rod fits freely into
injection pump throttle lever.
5. Tighten jam nut on the accelerator rod.
6. Connect the accelerator rod to the injection
pump throttle lever, then release the accelerator
pedal. Connect the pull-back spring.
COW L M O DELS

Accelerator and throttle linkage adjustment

information is the same as previously specified
for the Conventional Cab Models with exception of
Step 3, which should read:
3. Depress the accelerator pedal against the
floor stop instead of toe pan.
STEEL TILT CAB MODELS
NOTE- Key numbers in text refer to figure 2.
1. Tilt cab forward.
2. Using ruler measure return spring dimen­
sion at points shown. Dimension should be 7 inches.
If necessary, disengage rod assembly (17) from
upper lever and shaft assembly (14). Loosen rod
adjusting nut, then turn end link as required to
obtain dimension. Tighten lock nut and engage rod
(17) to bracket assembly (14).
G M C S E R V I C E M A N U A L
^ b ie A e l £ w a u i& f y u e i S u ite s n
3. Lower cab to operating position.
NOTE: Accelerator pedal linkage is proerly
adjusted when accelerator pedal is contacting floor
mat and the fuel injection pump lever is in full
throttle position.
4. If necessary to adjust, loosen lock nut at
clevis (6) and turn relay lever to idler lever rod
(7) in or out of clevis (6) to obtain full throttle at
fuel injection pump when throttle pedal (4) is de­
pressed to floor mat. Tighten clevis lock nut when
correct adjustment is made.
H A N D THROTTLE ADJUSTMENT
Adjust hand throttle as instructed previously
under "Hand Throttle Adjustment" in GASOLINE
ENGINES (SEC. 6A) of this manual.
ENGINE STOP CONTROL
1. With engine stopped, loosen screw which
secures control wire to swivel, then push engine
stop handle completely in.
2. Move stop lever on injection pump as far
as possible toward end of control wire, then tighten
screw to secure control wire to swivel. Be sure
lever clamp bolt is tight.
3. Start engine and check operation of stop
control.
Sec. 6M
Page 347