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Section IV. TROUBLESHOOTING - TM-55-4920-226-150024
Up
TM-55-4920-226-15 Test Stand Aircraft Hydraulic AHT-5A-1 Type D-5A Manual
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Section V. HYDRAULIC SYSTEM
Possible
remedy
Probable
cause
Air shroud loose or damaged ---------------------------------------- Tighten air shroud. Report damaged shroud to direct
and general support maintenance.
Cylinder cooling fins clogged with dirt ---------------------------- Report malfunction to direct and general support main-
tenance.
60. Engine Knocks or Develops Excessive Noise
Possible
remedy
Probable
cause
oil
level
too
low
---------------------------------------
Stop  engine  and  add
oil
to
proper
level.
Refer
to
lubrication chart.
61. Engine Oil Pressure Low
Possible
remedy
Probable
cause
oil
level
too
low
--------------------------------------
Stop  engine  and  add  oil  to  proper  level.  Refer  to
lubrication chart.
Oil
pressure
gage
defective
-------------------------------------
Report  malfunction  to  direct  and  general  support
maintenance.
62. Engine Exhaust Smoky
Possible
remedy
Probable
cause
Crankcase oil level too high ---------------------------------------- Drain off excess oil to correct level.
Carburetor choked excessively --------------------------------------- Push in choke control.
Engine cold causing poor combustion ----------------------------- Allow sufficient time for engine warm up before oper-
ating the hydraulic system.
63. Fuel Consumption Excessive
Probable
cause
Possible
remedy
Choke  control  partially  closed  ----------------------------------  Open  choke  control.
Dirty air cleaner --------------------------------------------------------  Service the air cleaner (par. 52).
Fuel  leaks  ----------------------------------------------------------------  Report  to  direct  and  general  support
maintenance.
64. Battery Needs Frequent Recharging
Probable
cause
Possible
remedy
Battery electrolyte level low ------------------------------------- Add battery water to correct level (par. 9).
Battery  defective  ------------------------------------------------------  Replace  defective  battery  (par.  9).
65. Hydraulic Pump Fails to Deliver Sufficient Pressure
Probable
cause
Possible
remedy
High pressure relief valve out of adjustment ------------ Adjust the high pressure relief valve (par. 43).
Compensator control incorrectly adjusted -------------------- Adjust the compensator control (par. 43).
Fluid bypass valve open ------------------------------------------- Close the fluid bypass valve.
Defective fluid pressure gage ------------------------------------ Report to direct and general support maintenance,
66. Hydraulic Pump Fails to Deliver Sufficient Volume
Probable
cause
Possible
remedy
Fluid volume control incorrectly adjusted ------------------ Adjust the fluid volume control (par. 43).
Engine speed incorrect ---------------------------------------------- Set throttle for an indicated 1800 rpm.
67. Hydraulic System Pressure too High
Probable cause
Possible
remedy
High pressure relief valve set too high ------------------------- Adjust high pressure relief valve (par. 43).
High pressure relief valve defective ------------------------- Refer the malfunction to direct and general support
maintenance.
68. Hydraulic Fluid Temperature too High
Probable
cause
Possible
remedy
Low pressure filter dirty ------------------------------------------------
Report deficiency to direct and general support main-
tenance.
Reservoir fluid level low ----------------------------------------------- Fill reservoir to correct level (par. 9).
AGO 5742A

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