6- MAINTENANCE
IMPORTANT NOTE: Use only original HILMAN spare parts.
6.1. Preventive
A – Before each use
•Check that all plugs and screws are tightened by hand.
•Check that there are no visible signs of an oil leak.
•Check that the barrel, toe and base are not deformed or cracked.
•Check that the pump operates normally when not loaded.
B – Yearly
The frequency of this check should be shortened if the jack is used very
frequently.
•Check that all nuts, screws and plugs are tightened. Adjust if necessary.
•When the jack is not under load: pump up to full travel distance until the
release value operates. No signs of leaks should be found (signs of oil
on the column or the piston is normal). Release the pressure and
inspect the column for signs of impacts, scratches as well as
straightness. Replace the column if defective.
•Lower the jack by hand. Check that there are no friction points (slight
vibrations are normal.)
•Examine carefully all external parts of the jack.
Barrel: deformation, cracks, impact marks.
Pump lever: deformation, excessive clearance in pins (replace pins if
an excessive clearance is found).
Toe: deformation, cracks.
Base: deformation, cracks.
•In the event of doubt (especially regarding cracks), do not hesitate in
replacing or carrying out any pertinent inspection to check the part.
•All defective parts must be replaced and, most of all, not straightened
out, heated or welded.
•Part replacement must be in accordance with the instructions given
under disassembly-assembly (paragraph 6.3).
6.2 Malfunction, Failures
FINDINGS CAUSES / TESTS REMEDIES
The hand tube is “slack“ and
the jack does not lift the load.
Try without load to find
out if it is the same:
Otherwise:
Bleed as in paragraph 6.3.2.E
Replace the diaphragm.
The hand tube rises after each
time it is pumped.
The check valve leaks. Retry after pumping several times
under no load. If this continues,
replace it.
The jack does not lift up nor
hold the load.
The load is too high.
The relief valve is not
fully tightened.
If the fault continues
Check the weight of the load, check
whether it is stuck somewhere or
hooked onto something.
Tighten it by hand, then retry.
Replace the relief valve.
The hand tube is exceptionally
hard to move.
The pump piston is
twisted.
The valve is seized.
Replace it.
Replace it.
The hand tube is exceptionally
hard to move and the jack does
not lift normally.
Insufficient oil in the
diaphragm.
Adjust the quantity of oil, refer to
paragraph 6.3.2 E.
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