TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download
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TM 9-2815-220-34 Table ,·2. Troubleshooting P1ced11res Malfunction Probable cause Corrective action Fuel System Abnormal Conditions- Continued L4.2 Water contaminated fuel: 14.3 Accelerator and throttle linkage deficiencies. 14.4 In-Tank fuel pump deficiencies: 14.6 Fuel Jilter restriction: 14.6 Fuel iajection pump deficiencies: 2-18 Change 3 c. Damaged fuel hoses(fuel pump to filter, or filter to fuel iajection pump). a. Automatic drain system inoperative. a. Insufficient throttle travel. b. Vehicle accelerator linkage loose, wom, binding, disconnected, improperly adjusted, or pedal return spring malfunction. c. Engine throttle linkages lꝏse, wo, binding, improperly adjusted or disconnected. c •Remove and install new hoses (para 3-14 b). a. Refer to item 14.13. a. Place ? inch wide piece of writing paper over end of high idle austing screw and depress accelerator pedal fully. If control lever stop contacts adjusting screw and holds paper tightly, full throttle travel exists. (pnra 2-2lb (15)). Repeat above after each of the follow- ing steps. b. J nspect, repair, and adjust. Ilefer to pertinent Chicle technical manual. c. Inspect, repair or replace as necessary (para 2-40 or 2-40.1). d. Engine throttle cross shaft idle or full- d. Adjust to proper slop clearances throttle positions improperly ad- (para 2-21b (15)). justed. e. Engine throt lie cross shaft shock e l . Inspect for broken spring and replace. spring defective (broken spring allows e2. Check free movement. Replace free movement between tangs spring if clearance is greater than and lever pins). 0.010 inch. f. Improפr low idle austment (engine n. Adjust low idle screw to proper crosshaſt idle screw). engine speed (675-725 pm). Turn clockwise to increase and counter clockse decrease speed (pal's 2-2lb (15)). g. Engine will not maiitain 1800 rpm sפed during winching operations. a. Electric circuit defective, or electric motor failure. b. Pump output insufficient. (Defective pump, or screen clogged.) a. Primary and/or fueVwater separator filter element clogged. (, water.soaked or waxed.) a Fuel iajection pump governor low-idle speed austment improper. b. Fuel iajection pump governor high-idle speed improper. . If speed below 725 rpm cannot be obtained with adjustment. n, proceed to item 14.6. g. Adjust solenoid control speed screw or replace throttle control solenoid assembly (para 2-49.2). al. Cheek if operative. Refer to DT-6.l. a2. Check electric circuit. Refer to pertinent vehicle technical manual, and repair as required. a3. Replace pump assembly. Refer to pertinent vehicle technicnl manual. bl. Check pressure and output. Refer to DT-6. b2. Repair or replace pump. Refer pertinent vehicle technical manual. a.Check fuel pressure. Rer to · L2. Replace defective filter elements (para 2-24 and 2-26). al. Adjust low-idle stop screw on fuel in· jection pump (para 2-2lb(16)). NOTE Required only when engine speed cannot be adjusted as described in item 14.3. a2. •If low idle speed cannot be obtained, replace fuel iajection pump(para 2-21). bl. Check high-idle speed. Refer to DT-15.l.