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Page Title:
Table 13. Hydraulic System (Unit) Troubleshooting Procedures. |
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 TM 10-3930-660-24-1
TROUBLESHOOTING PROCEDURES - CONTINUED
0006 00
Table 13. Hydraulic System (Unit) Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Cold hydraulic oil.
Operate hydraulic system until
1.
Hydraulic Functions Operate Slowly.
hydraulic oil warms up (TM 10-
3930-660-10).
2. Engine speed too low.
Increase engine speed with
accelerator pedal (TM 10-3930-
660-10).
3. Check oil level.
Add hydraulic oil to proper level
4. Inspect hydraulic line(s) and
Replace hose(s) and tube(s) as
tube(s) for damage.
necessary (WP 0195 00 or WP
5. Check strainers and filter for
Repair or replace filter (WP
obstructions.
clean tank strainers (WP 0198
6. Check relief valve for
Inspect relief valve in system
defects.
with little or no pressure.
Replace relief valve if necessary
7. Check for worn or defective
Test pumps for proper operation
pumps.
and replace if necessary (WP
8. Check for proper hydraulic
Verify oil weight with oil
oil viscosity.
sample. If incorrect, drain
hydraulic tank (WP 0032 00).
Add correct oil.
Check for air leak in hydraulic
Operate hydraulic system, purge
2.
Hydraulic Functions Move Erratically.
system.
air from hydraulic circuits.
Check for leaks and loose
connections on pump inlet lines
1. Check for pinched or kinked
Replace pilot hoses as necessary
3.
Slow Boom or Extend Functions.
sections of pilot hoses.
from cab to control valve (WP
2. Check for defective
Replace hydraulic joystick
hydraulic joystick control
control valve if necessary (WP
valve.
1. Check for water in hydraulic
Determine where water entered
4.
Foamy Hydraulic Oil.
oil.
system. Change oil (WP 0032
2. Check oil level.
Add oil as necessary (WP 0011
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