TM-9-2815-220-24
AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL FOR AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines
TM-9-2815-220-24 - Page 144 of 1563
TM 9-2815-220-24
FUEL SYSTEM ABNORMAL CONDITIONS
0020 00
MALFUNCTION 3:
Accelerator and throttle linkage deficiencies.
PROBABLE CAUSE
CORRECTIVE ACTION
a. Insufficient throttle travel.
(1) Place 3/4-inch wide piece of writing paper
over end of high idle adjusting screw and
depress accelerator pedal fully.
If control
lever stop contacts adjusting screw and
holds paper tightly, full throttle travel exists.
Repeat this after each step in this
Malfunction 3.
b. Vehicle accelerator linkage loose, worn,
binding, disconnected, improperly adjusted,
or pedal return spring malfunction.
(1) Inspect, repair, and adjust (refer to pertinent
vehicle technical manual).
c. Engine throttle linkages loose, worn,
binding, improperly adjusted or
disconnected.
(1) Inspect, repair or replace as necessary
(WP 0122, Throttle Control and Manual
Fuel Shutoff Replace/Repair).
(WP 0123
for 2DR)
d. Engine throttle cross-shaft idle or full-
throttle positions improperly adjusted.
(1) Adjust to proper stop clearances (WP 0043,
Throttle Adjustments).
(1) Inspect for broken spring and replace
(WP 0122, Throttle Control and Manual
Fuel Shutoff Replace/Repair.
(WP 0123 for
2DR)
e. Engine throttle cross-shaft shock spring
defective (broken spring allows free
movement between tangs and lever pins).
(2) Check free movement.
Replace spring if
clearance is greater than 0.010 inch.
(1) Adjust low idle screw to proper engine
speed (675-725 rpm).
Turn clockwise to
increase and counter clockwise to decrease
speed (WP 0040, Engine Operating
Parameters).
f.
Improper low idle adjustment (engine cross-
shaft idle screw).
(2) If speed below 725 rpm cannot be obtained
with adjustment above, proceed to
Malfunction 6 in this work package.
g. Engine will not maintain 1800 rpm speed
during winching operations (AVDS-1790-
2DR only).
(1) Adjust speed control solenoid screw
(WP 0040, Engine Operating Parameters),
or repair throttle control solenoid assembly
(WP 0122, Throttle Control and Manual
Fuel Shutoff Replace/Repair.
(WP 0123 for
2DR)
WP 0020 00-2
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