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9.0 Troubleshooting JHS-2200A Hydraulic Stacker Number in parentheses refers to corresponding number in parts breakdown, section 10.1.1
Trouble Probable Cause Remedy
Fork will not lift to
maximum height. Hydraulic oil level is low. Fill with hydraulic oil.
Fork will not rise.
Oil level is low, or oil is too viscous. Fill with oil, or change oil.
Oil has impurities. Change oil.
Hex nut (#62) is too high, keeping the
pumping valve open. Adjust hex nut properly.
Air in hydraulic pump.
Release air from system by pulling up
pump release lever, then pumping
handle up and down several times.
Fork cannot be
lowered.
The lifting piston is deformed, resulting
from overloading. Replace piston.
The fork was kept in high position for
extended period, resulting in rusting
and jamming of the exposed piston rod.
Keep fork in lowest position when not in
use. Keep piston well lubricated.
Adjustment nut (#62) not in correct
position. Adjust nut properly.
Fork frame and roller sprocket are
jammed.
Correct jam; replace bearing if
necessary.
Hydraulic fluid leak.
Sealing parts worn or damaged. Replace parts.
Some parts cracked or worn. Replace parts.
The fork descends
without the release
valve working.
Release valve unable to close properly
due to impurities in hydraulic oil. Replace with new oil.
Hydraulic system cracked or bored. Inspect and replace the waste parts.
Air in the oil.
Release air from system by pulling up
pump release lever, then pumping
handle up and down several times.
Seal parts worn or damaged in
hydraulic pump. Replace worn or damaged parts.
Adjustment nut (#62) not in correct
position. Adjust nut properly.
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for business hours, www.jettools.com). Having the Model Number and Serial Number of your machine available
when you call will allow us to serve you quickly and accurately.