ESCO Equipment Supply Company
4
CAREFULLY
lower the load by turning the release valve counterclockwise (use the slotted end of the
handle) in extremely small increments, then lower the extension screw by turning it clockwise as
needed and remove the jack.
WARNING! Dangerous dynamic shock loads are created by quick opening and closing the release
valve when the load is being lowered. The resulting overload may cause hydraulic
system failure which could cause severe personal injury and/or property damage.
4. MAINTENANCE
4.1 Clean the outside of the jack with dry, clean and soft cloth and periodically lubricate the joints, extension screw and
all moving parts with a light oil as needed.
4.2 When not in use, store the jack in a dry location with ram(13) and extension screw(13.1) fully lowered.
4.3 Purge the hydraulic system to eliminate any air in the system if jack efficiency drops or jack doesn’t work: A. If
manual operation performs poorly, use the slotted end of the handle to turn the release valve 1-1/2 turns
counterclockwise and remove the oil filler plug (16) by gently pulling, insert the handle into the handle bracket
and pump it 10 to 15 times, then replace the filler plug. B. If air operation performs poorly, connect the air inlet
fitting to air source, use the slotted end of the handle to turn the release valve 1-1/2 turns counterclockwise and
remove the oil filler plug (16) by gently pulling, turn on the air valve to let the pump work for one minute, then
replace the filler plug.
4.4 Check the hydraulic oil: place the jack in an upright position, completely lower the ram and remove the filler plug,
if it is not adequate, fill with high quality hydraulic jack oil to the lower rim of the fill hole, purge away air from the
hydraulic system as described in 4.3, top off with more hydraulic oil, then replace the filler plug.
4.5 For best performance and longest life, replace the complete jack oil at least once per year: With the ram fully
lowered, remove the oil filler plug, lay the jack on its side and drain the oil into a suitable container, then fill with
high quality hydraulic jack oil as described in 4.4, reinstall the filler plug.
NOTE:
Dispose of hydraulic oil in accordance with local regulations.
4.6 It is recommended that an annual inspection be done by qualified technicians.
