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8. Maintenance
– 13 –
EN
Problem Possible Cause Remedy
The lifting arm does not raise when
the handle shaft is pumped.
The release valve is not fully closed. Twist the handle shaft clockwise
until strong resistance is felt and
bleed the piston if necessary.
The maximum load has been
exceeded.
Use an appropriately rated jack or
reduce the weight of the load.
DO NOT adjust the overload valve.
The lifting arm fulcrum bar is
not lubricated.
Use a grease gun to apply oil to the
grease nipple.
The piston system is corroded. DO NOT use the jack. Contact
Draper Tools to discuss repair or
replacement options.
The saddle drops once lifted. The release valve is not fully closed. Twist the handle shaft clockwise
until strong resistance is felt
and bleed the piston if necessary.
The hydraulics mechanism
is damaged.
DO NOT use the jack. Contact
Draper Tools to discuss repair or
replacement options.
The handle shaft cannot be
operated or raises the saddle slowly.
The piston system is not
appropriately lubricated.
Follow steps in section 7.1.
The handle shaft cannot
be twisted.
The attaching bolt has been
overtightened.
Slightly loosen the attaching bolt.
8.4 Troubleshooting
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