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Section ill. TROUBLESHOOTING
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TM-55-4920-226-15 Test Stand Aircraft Hydraulic AHT-5A-1 Type D-5A Manual
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Tire Wear Abnormal or Uneven
83. Engine Overheats
Probable
cause
Possible
remedy
Cylinder cooling fins dirty ---------------------------------------------------- Clean dust and dirt from cooling fins.
Magneto  timed  late  -----------------------------------------------  Time  the  magneto  (par.  115).
Air shroud partially removed from engine-
-Install the missing shroud (pars. 118 and 119).
84. Engine Knocks or Develops Excessive Noise
Probable
cause
Possible
remedy
Magneto timing advanced too far -------------------------------------- Time the magneto (par. 115).
Carbon deposits on cylinder heads ----------------------------- Remove and clean cylinder heads (par. 124).
Flywheel  loose  -------------------------------------------------------------- Tighten the flywheel (par. 118).
85. Engine Exhaust Smoky
Possible
remedy
Probable
cause
Carburetor incorrectly adjusted ---------------------------------------  Adjust the carburetor (par. 122).
Carburetor  defective  ------------------------------------------------------- Repair or replace carburetor (par. 122).
86. Engine Starter Fails to Operate
Possible
remedy
Probable
cause
ignition fuse.
Ignition
fuse
blown
--
-.
Replace
brushes (par. 113).
Starter
brushes
worn
--
-..
.
.
.
Replace
connections or replace wiring (par. 113).
Electrical connections loose or corroded ------------------ -------------Tighten
starter switch (par. 138).
Starter switch contacts burned
-.. .. Replace
starter brushes (par. 113).
S t a r t e r brushes defective -.. -
--Replace
87. Fuel Consumption Excessive
Possible
remedy
Probable
cause
Carburetor incorrectly adjusted ---------------------------------------- Adjust the carburetor (par. 122).
Fuel  tank  leaking  --------------------------------------------------------- Repair or replace fuel tank (par. 132).
Carburetor defective --------------------
Repair or replace carburetor (par. 122).
88. Ammeter Shows No Charge or Discharge With Engine Operating
Possible
remedy
Probable
cause
Electrical
connections loose or corroded ------------------- Clean and tighten electrical connections.
Generator
regulator incorrectly adjusted or faulty ------------- Replace generator regulator as required (par. 111).
V-belt loose or broken ---------------------------------------- Adjust or replace V-belt as necessary (par. 112).
inoperative  ------------------------------------------------ Replace worn brushes (par. 112).
defective ---------
----------------- Replace ammeter (par. 137).
89. Ammeter Shows Excessive Charge
Possible
remedy
Probable
cause
Battery  run  down  --------------------------------------------------  Charge  battery.
Generator regulator defective -------------------------------------- Replace a defective regulator (par. 111).
Generator field winding grounded --------------------------------------Replace generator (par. 112).
90. Ammeter Needle Fluctuates Rapidly
Possible
remedy
Probable
cause
Electrical connections shorted or loose --------------------------------- Repair short circuits and tighten loose connections.
Generator commutator has high mica ------------------------- Report to depot maintenance.
91. Wheel Wobbles
Possible
remedy
Probable
cause
Wheel  bent  ---------------------------------------------  Replace  the  wheel  (par.  163).
Wheel  loose  on  the  hub  --------------------------------------  Tighten  wheel  mounting  bolts.
Wheel bearing incorrectly adjusted ----------------------- Adjust wheel bearing (par. 163).
92. Wheel Bearings Overheat
Possible
remedy
Probable
cause
Wheel bearings lack lubricant ------------------------------ Lubricate wheel bearings (par. 163).
Adjust wheel bearings (par. 163).
Wheel bearings incorrectly adjusted
AGO 5742A

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