TM 5-3740-218-13&P
Table 5-1. Direct Support Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
2. NO HYDRAULIC PRESSURE TO PRIMARY MANIFOLD.
Check for defective hydraulic pump.
•
If hydraulic pump is excessively noisy, replace hydraulic
pump (para 5-8).
3. UNABLE TO MAINTAIN HYDRAULIC PRESSURE IN PRIMARY MANIFOLD.
Step 1. Check for defective pressure gage.
•
If hydraulic pressure is present at primary manifold but gage
has no indication, replace pressure gage (para 5-10).
Step 2. Check for defective primary manifold solenoid.
•
With multimeter set to ohms scale, measure resistance
between solenoid terminals. Reading should be 4-10 ohms. If
reading is less than 4-10 ohms, replace solenoid (para 5-10).
Step 3. Check for operation of flow regulator.
•
If unable to adjust flow, replace flow regulator (para 5-10).
Step 4. Check for defective primary manifold.
•
If pressure drops steadily on pressure gage, repair or replace
primary manifold (para 5-10).
4. NO PRESSURE/UNABLE TO MAINTAIN HYDRAULIC PRESSURE IN SECONDARY MANIFOLD.
Step 1. Check for defective hydraulic pressure gage.
•
If hydraulic pressure is present at secondary manifold but
gage has no indication, replace pressure gage (para 5-9).
Step 2. Check for defective secondary manifold solenoid.
•
With multimeter set to ohms scale, measure resistance
between solenoid terminals. Reading should be 8-9 ohms. If
reading is less than 8-9 ohms, replace solenoid (para 5-9).
Step 3. Check for operation of flow regulator.
•
If unable to adjust flow, replace flow regulator (para 5-9).
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