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Page Title:
OPERATING/ADJUSTING HYDRAULIC JACK STANDS - CONTINUED |
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 TM 5-2410-233-23
GROUND HANDLING PROCEDURES - CONTINUED
0178 00
OPERATING/ADJUSTING HYDRAULIC JACK STANDS - CONTINUED
3.
Lift item using the following procedure:
a.
Close control valve on hydraulic pump.
CAUTION
Extension tube may bind in stand when tube is lifted by hydraulic cylinder. Observe jack stands carefully
during lifting procedure. Tapping with hammer may free binding.
b.
Operate hydraulic pump to raise jack stands.
WARNING
Ensure jack stands raise evenly to provide a balanced lift. Failure to raise evenly could cause an unstable
condition. Serious injury or death could result.
c.
If jack stands do not raise evenly, partially close throttle valve connected to higher jack stand. While pumping,
close valve until jack stands raise evenly when operating hydraulic pump.
WARNING
Extension tube can only be raised until bottom hole of extension tube is aligned with top hole of jack stand.
Hydraulic jack stands become unstable if raised higher. Instability can allow item to fall, causing personal
injury or death.
d.
If hydraulic cylinders (4) are fully extended, but item is not lifted enough, install pin (7) through each jack stand
and extension tube (1). This will keep jack stand raised while cylinders are retracted. If jack stands are high
enough, go to step j.
e.
Open control valve on hydraulic pump and remove pin (8) above each collar (2).
f.
Retract hydraulic cylinder (4) and lower collar (2).
g.
Install pin (8) in first hole above collar (2).
h.
Close control valve on hydraulic pump and operate pump to raise jack stands.
i.
Repeat steps d through h only until item is lifted high enough or bottom hole of extension tube (1) is aligned with
top hole of jack stand.
j.
Install pin (7) through each jack stand and extension tube (1) to secure jack stand in raised position. Remove
hydraulic pressure by opening control valve on hydraulic pump.
4.
Slowly lower item, using the following procedure:
CAUTION
Extension tube may bind in jack stand when extension tube is lowered by retracting hydraulic cylinder.
Observe jack stands carefully during lowering procedure. Tapping tube with a hammer may free binding.
a.
Slowly open control valve on hydraulic pump. Allow hydraulic cylinders to retract completely.
0178 00-3
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