JLG sky trak mmv Service Manual page 184

Boom
3
STEP 2
USE IN CASE OF:
Boom Lift Line Failure (Lift Cylinder to Bulkhead) (1)
Boom Lift Line Failure (Bulkhead to Control Valve) (2)
Boom Extend Line Failure (3)
1. Clear the area of any unnecessary personnel.
2. Block all four wheels.
WARNING:
ing and proper eye protection when working
with or around hydraulic oil. Wait for hydraulic
oil to cool before attempting to repair the fail-
ure. Hot hydraulic oil can cause severe burns
and other serious injuries.
4.40
1
2
OT06512
Wear protective cloth-
3. Place a container under the failed hydraulic hose to
catch hydraulic oil that may escape during this
procedure.
4. Return to the cab, fasten your seat belt and start the
engine.
5. Slowly retract the boom.
6. Slowly lower the boom and ground the carriage.
7. Shut off the engine.
8. Completely remove the load from the carriage.
9. Place an Accident Prevention Tag on both the ignition
switch and steering wheel, stating that the vehicle
should not be operated. (Refer to Section 1.5,
Accident Prevention Tag Usage .)
10. Have the vehicle serviced immediately. Replace any
failed hydraulic lines with new hydraulic parts.
11. Return to the cab, fasten your seat belt and start the
engine.
12. Cycle the lift/lower cylinder several times to bleed air
from the system. Check for leaks.
13. Recheck the hydraulic oil level. Add oil as needed.
14. Transfer any wasted hydraulic oil to a covered
container and label as used oil. Dispose of used oil
at an approved recycling facility.
STEP 3
Boom Lower Line Failure
(Lift Cylinder to Bulkhead) (4)
Boom Lower Line Failure
(Bulkhead to Control Valve) (5)
1. Clear the area of any unnecessary personnel.
2. Block all four wheels.
WARNING:
raised boom unless the boom is blocked up.
Always block the boom before doing any ser-
vicing that requires the boom to be up.
3. Temporarily block up or support the outer boom.
DO NOT get under a
Model MMV Rev. 12/04