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Maintenance
Keep the hydraulic rams clean and free of any
dust, dirt, or foreign debris. Abrasive material
stuck to the ram can damage the hydraulic seal
when the ram is retracted back into the jack.
Regularly wipe the hydraulic rams clean with a
lightly oiled rag.
The Model H8091 will require hydraulic fluid after
long-term use. This will be noticeable if the jack
will not reach its maximum height when pumped.
Only use a high quality hydraulic fluid.
To add hydraulic fluid:
1. Completely lower the jack.
2. Remove the fill plug shown in Figure 3.
Bleeding the Air
If the jack becomes spongy or will not rise when
pumped, then air bubbles may be in the hydraulic
system. These air bubbles must be 'bled' from
the hydraulic fluid before the jack can be safely
operated.
To remove the air bubbles:
1. Remove the fill plug.
2. Rotate the handle counterclockwise until it
stops.
3. Pump the jack handle rapidly to force the air
bubbles out through the fill hole. When the air
bubbles and fluid stop coming out, put the fill
plug back.
4. Repeat Step 3 as many times as needed until
the air bubbles stop coming out in the hydrau
-
lic fluid.
3. Add fluid until it reaches the top of the fill plug
hole.
4. Replace the fill plug.
5. Test the operation of the jack by pumping
it up to the maximum height and applying a
load to the saddle. The jack should hold the
weight of the load without a sinking or spongy
feeling.
—If the jack did not perform properly, then
air may need to be bled from the pump
system.
Figure 3. Fill plug.
Fill Plug