OPERATION
Check load rating on jack nameplate to make certain the jack is capable of lifting the
load. Use a gauge to monitor the load. Use the table below to determine the proper
gauge kit for your jack.
Model No.
GF-715
GF-830
GF-350
For use
with
Jacks
JHA-73
JHA-756
JTA-76
JHA-156
JHA-356
JTA-176
JHA-1506
JTA356
Raising the Load
1.
On models with air vents, open air vent.
2.
Use wrench end of handle to close the release valve by turning clockwise hand tight.
CAUTION
Excessive tightening is unnecessary and will cause wear.
3.
Insert handle into jack pump beam and pump until desired height is
reached.
NOTE:
For 150 ton JHA jacks, use speed (A) pump beam until
plunger reaches load. Then move the handle to load (B )
pump beam to lift the load.
CAUTION
In certain situations, the handle can kick back. Always keep body away
from the line of force of the handle.
4.
Remove jack handle when not in use.
WARNING
Stay clear of loads supported by hydraulics. After the load has been
raised, it should be blocked, using material capable of lifting the load.
Lowering the Load
1.
Use wrench end of jack handle to open the valve a very small amount to avoid sudden
dropping of the load. Turn release valve counter-clockwise very slowly to control the
speed of descent.
WARNING
NEVER turn release valve quickly to full open when there is a load on the
jack. The load will fall uncontrolled, leading to personal injury and/or
property damage.
2.
All jacks are load return. Without a load, the plunger may not retract. Adding weight
to the plunger will make it retract.
CAUTION
If you decide to stand on the jack, be sure the jack is stable and hold on to
a sturdy object to avoid injury.
A
B
5
