JLG sky trak mmv Service Manual page 183

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STEP 1
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. If the load is in a position where it can be removed safely,
completely remove the load from the carriage;
otherwise, leave the load in place.
Model MMV Rev. 12/04
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OT01712
DO NOT get under a
4. Temporarily block up or support the outer boom.
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.
5. Replace the failed hydraulic line (identified in the
table and illustration on previous page) with a new
part.
6. Check the hydraulic oil level. Add hydraulic oil if
needed.
7. Remove the blocking or support from the outer boom.
8. Return to the cab, fasten your seat belt and start the
engine.
9. Tilt the carriage upward if necessary for clearance
before retracting the boom.
10. Slowly retract the boom.
11. Slowly lower the boom and ground the carriage.
12. Shut off the engine.
13. Completely remove the load from the carriage if you
haven't already done so.
14. Return to the cab, fasten your seat belt and start the
engine.
15. Cycle the lift and extend cylinders several times to
bleed air from the system. Check for leaks.
16. Recheck the hydraulic oil level. Add oil if necessary.
Boom
Wear protective cloth-
4.39