11
Joerns Liing and Repositioning
Model HML400, C-HLA, C-HLA-2, C-HLA-2T
© 2015 Joerns Healthcare • IM-459001 RevC • 15-2003
Troubleshooting, Power Unit
Symptom Action
Handle mounting holes
loosening or enlarging
• Periodically oil the pivot point
Jack lowers with patient
suspended
• Check to make sure the pressure release knob is completely closed.
• Check valve not sealing. Pump handle rapidly several times, then open pressure
release knob and pull down on boom. Repeat two or three times.
• Replace the jack
Jack fails to lift to
full height
• Air in oil under ram– pump unit up as far as it will go. Open pressure release knob and
pull down on boom to lowest position. Repeat until lift raises to full height.
• Unit may be low on oil– remove jack from lift, collapse ram. Remove socket screw
(located on top of top cap) and put 1oz. of #10 weight hydraulic oil in at a time until the
jack ram moves the proper distance.
NOTE– Proper amounts of oil for a jack when completely empty are 7 3/4 oz. for 12" stroke; 11 1/2 oz. for
17" stroke; 3 3/4 oz. for 6" stroke; 12 1/2 oz. for 19" stroke.
Oil leaking from
around piston
• Replace the jack
Oil leaking around rim of
top cap
• Replace the jack
Unit will not lower • Lay jack on its side. Remove and clean release cartridge making sure small holes are
cleaned out with pin or small diameter wire.
• Replace the jack.
Jack is noticeably loose
in the mounting bracket
located at the base of
the jack.
• Refer to “Inspection of Hydraulic Pump Stud” section to tighten the mounting stud for
the jack.
Lifter Maintenance Checklist continued...
Item Initially Before
each use
Bi-
Monthly
Lubrication
Oil all pivot joints, including:
Top of mast where boom attaches
✔
Top and bottom of actuator mounting
✔
Pump handle hinge
✔
Use a light grease to lubricate base adjustment lock plate and
all rotating hardware.
✔
Wheel and swivel bearings
✔
Cleaning*
Use mild soap to clean; dry thoroughly.
✔
Apply auto or appliance wax
✔
Keep painted surfaces clean from oil
✔
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