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TM 9-5130-338-12&P
Table 4-2. UNIT MAINTENANCE TROUBLESHOOTING.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
Hydraulic Impact Wrench Fails to Operate.
Step 1-Refer to applicable vehicle manual and ensure that vehicle is properly set up for hydraulic impact wrench
operation.
Step 2-Inspect wrench hydraulic hose couplings to ensure they are properly connected and free of restrictions.
Remove all restrictions from hose couplings. If restriction cannot be removed, replace
hose couplings (refer to applicable vehicle manual). Ensure hose couplings are properly
connected.
Step 3-Inspect hydraulic hoses for restriction or damage that would stop oil flow.
Repair or replace restricted or damaged hydraulic hoses (refer to applicable vehicle manual).
Step 4-Check that rotation direction selector control is properly set for desired rotation.
Set selector control fully in desired rotation direction.
Step 5-With all of above checks performed, attempt to operate hydraulic impact wrench.
If hydraulic impact wrench fails to operate, repair hydraulic impact wrench (see para. 4-17).
2. Hydraulic Impact Wrench Fails to Develop Full Power.
Step 1-Refer to applicable vehicle manual and ensure controls are set to deliver sufficient oil for desired torque
requirement.
Set vehicle controls to provide sufficient oil flow for torque requirement.
Step 2-Check that rotation direction selector control is set fully in position for desired rotation.
Set rotation direction selector control fully in position for desired rotation.
Step 3-Inspect hose for oblivious kinks, flat spots, or obstructions. Remove obstructions or replace hoses as
required (refer to applicable vehicle manual).
Step 4-Check for torque requirements in excess of wrench capacity. Do not attempt to turn any fastener
requiring torque in excess of 850 pound-feet (lb-ft) (1152 Newton-meters [N•m] ).
Step 5-Inspect impact head for worn, loose, or damaged parts. Also check for proper lubricant (see para. 4-11).
Replace worn, damaged, or broken parts. Properly lubricate head (see para. 4-11).
Step 6-Test hydraulic impact wrench to ensure full power is developed. If hydraulic impact wrench fails to
develop full power, repair hydraulic impact wrench (see para. 4-17).
3. Hydraulic Impact Wrench Operation Is Sluggish or Erratic (Motor Fails to Respond).
Step 1-Refer to applicable vehicle manual and ensure that vehicle is supplying sufficient oil for proper hydraulic
impact wrench operation.
Set vehicle control for proper hydraulic impact wrench operation.
4-5
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