1
TM 9-4940-568-10
3-32
Table 3-1. Troubleshooting - CONT.
Malfunction
Test or Inspection
Corrective Action
CRANE (CONT)
4.
BOOM DOES NOT RAISE OR LOWER, OR RAISES AND LOWERS SLOWLY.
Step 1. Check outside temperature. If temperature is less than 0 F (-17 C), hydraulic oil may
be thick and not flow easily. When operating crane (1) in extremely cold weather, proper
warm-up procedures must be followed.
If operating crane in extremely cold weather, refer to Para 2-41 for specific
warm-up instructions.
If operating crane in other than extreme cold conditions, go to Step 2.
Step 2. Check that load is not over the load limit shown on the range diagram (Para 2-29).
If load is over maximum weight, lower load and reduce load to correct weight.
If load is OK, go to Step 3.
Step 3. Check for loose or leaking hydraulic connections and damaged hydraulic tubes or hoses.
Tighten loose connections. If leak does not stop, notify Unit Maintenance.
If tubes or hoses are damaged or other problems are evident, notify Unit Maintenance.
