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operATing MAnuAl & pArTs lisT for Air/MAnuAl hydrAuliC boTTle JACks
operATing MAnuAl & pArTs lisT for Air/MAnuAl hydrAuliC boTTle JACks
TroubleshooTing
symptom
Will not lift to full height
Will not lower completely
Will not lift load
Will not lift full height
Pump feels "spongy" under load
Will not lift load
Handle raises under load
Handle lowers under load
Will not lift load
speCifiCATions
Model no.
Capacity
Minimum Height
Maximum Height
Base size (L x W)
Extension Screw
Hydraulic Lift:
Recommended Air Supply:
791-2300A & 791-2320A
possible Cause
Reservoir may overfill
The jack could be low on oil
Air trapped in system
Valve may not be closing
Overload condition
Air supply inadequate
791-2300
12 Ton
9-1/2"
18-5/8"
8-1/8" x 5-7/8"
3-1/8"
6"
7.8 CFM @ 90 - 175psi
(at least 3 h.p. is recommended)
Corrective Action
With jack upright, remove filler screw or
filler plug, open release and SLOWLY push
jack ram into lowered position. Any excess
oil will run out fill hole. Replace filler screw
or filler plug when oil has stopped flowing.
With jack in upright position and ram fully
lowered, remove filler screw or filler plug
and fill reservoir with clean hydraulic fluid.
Correct oil level is reached when oil level is
at bottom edge of fill hole.
With ram fully retracted, remove oil filler
screw/plug to let pressurized air escape,
reinstall oil filler screw/plug
Make certain release valve is closed. Starting
with ram in fully lowered position, SLOWLY
raise ram out to full height. Open release
valve and push ram down into lowered
position. Jack should now operate properly.
Remedy overload condition.
Ensure adequate air supply of
7.8 CFM @ 90 - 175psi.
791-2320
20 Ton
9-1/2"
18-1/4"
8-7/8" x 6-3/4"
3-1/8"
5-5/8"
7.8 CFM @ 90 - 175psi
(at least 3 h.p. is recommended)
4
11/15/06
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