National Crane Published 08/16/19 Control # 112-05 4-17
500E2 SERVICE MANUAL BOOM
JIB JACK SERVICE AND MAINTENANCE
Important: Use only a good grade hydraulic jack oil,
transmission oil, or turbine oil. Avoid mixing types of oil. Do
not use brake fluid, alcohol, glycerin, detergent motor oil, or
dirty oil. Improper fluid can cause serious Internal damage to
the jack rendering it inoperative.
Adding Oil
1. With saddle fully lowered and piston depressed, set jack
in upright level position and remove oil filler plug.
2. Fill until oil is level with filler plug hole.
Changing Oil
1. For best performance and longest life, replace the
complete oil supply at least once a year.
2. To drain the oil, remove the filler plug.
3. Lay the jack on its side and drain the oil into a suitable
drain pin. The oil will run slowly because air must enter
as oil drains out.
4. Be careful to prevent dirt or foreign matter from entering
the system.
5. Replace with proper oil as described above.
Lubrication
Add proper lubrication oil to all pivoting sections every three
months.
Rust Prevention
Check ram every three months for any sign of rust or
corrosion. Clean as needed and wipe with an oil saturated
cloth.
NOTE: When the jack is not in use, always leave the
saddle and ram all the way down.
Alignment
Pin in Slot
Stow Pin
Hook Assembly
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