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).