Hi-Force JAH Series User manual

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0806
JAH ALUMINIUM JACKS
Hi-Force JAH range of lightweight Aluminium jacks offer a wide variety of
capacities and lift height options. Available as either plain ram lifting jacks,
with or without ‘failsafe’ mechanical lock ring, or optional low height claw lifting
design. All models are constructed of lightweight Aluminium with all critical
functioning parts from high quality steel.
Instructions cover all the below models:
MODEL
FEATURES
JAH620
JAH1220
JAH630
JAH1230
JAH660
JAH1260
Jack with plain piston.
JAH620C
JAH1220C
JAH630C
JAH1230C
JAH660C
JAH1260C
Jack with plain piston and lifting claw.
JAH620SR
JAH1220SR
JAH630SR
JAH1230SR
JAH660SR
JAH1260SR
Jack with ‘failsafe’ locking ring.
SAFETY.
READ THIS MANUAL BEFORE OPERATING THE PUMP. FAILURE TO
OBSERVE THE FOLLOWING WARNINGS COULD RESULT IN SERIOUS
BODILY INJURY.
•Do not attempt to exceed the rated load on the head or toe of the jack.
•In operation, never drop loads onto the jack. Always raise the head/toe
to the load.
•Always ensure the full base area of the jack is supported when in use.
•Always ensure that loads are applied centrally to the ram, or to the full
extent of the claw.
•DO NOT allow any persons to work under the load, when it is only
supported by hydraulic jacks.
•Always clean the ram and retract it after use.
•Always remove the jack operating handle when not in use.
•Do not use if there is evidence of oil leakage.
•Never extend the ram by any means other than pumping the jack.
•Inspect and clean the jack after every use, but if subjected to abnormal
or shock loading inspect for damage immediately.

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CHECKING THE OIL LEVEL.
The jacks are normally supplied filled and ready for use. However before
using the jack for the first time, the oil level should be checked. The oil used
should be a high quality hydraulic oil of HVI ISO32 viscosity, e.g. Hi-force
HFO32.
Remove the dipstick (See figure 1) and check the oil level. The maximum
level is marked on the dipstick. The level should be within 5mm of this mark.
The dipstick should be screwed fully into position to determine this level.
OPERATION OF JACK. See Figure 1.
Note: The permissible working load and stroke of the Jack are marked on the
side.
The Jack (1) has an in-built hydraulic pump which is worked by means of an
operating lever (2), under the control of the operator. The piston (3) is raised
on each downwards stroke of the lever. For lifting, the lever is placed fully into
the operating quadrant (4). Three positions are provided to enable the user to
choose the best ergonomic position. For lowering, the piston the lever is
removed from the quadrant and placed into the release screw (5). Turning this
anticlockwise will allow the piston to descend. The amount this is rotated will
control the speed of decent. Only open a very small amount (approx. 5°) at
first. Rotate clockwise, hand tight after use, to ready the jack for the next
operation.

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JACKS WITH LOCKING COLLARS (TYPE SR)
All models can be supplied with threaded pistons and locking collars to
mechanically support the load without relying on the hydraulic circuit.
When the load is at the required position, rotate the locking collar clockwise
until it rest hand-tight on the top of the jack body.
To undo – operate the jack so that the hydraulic circuit just takes the load of
the locking collar. Rotate the collar anticlockwise until it reaches the top of the
piston.
JACKS WITH LIFTING CLAWS (TYPE C)
Claws are supplied as an accessory to provide a low height lifting point. When
fitted, lifting must always and only be carried out on the toe of the claw. See
Figure 2.
The capacity of the claw is 40% of the capacity of the jack to which it is fitted.
Lifting claws must NOT be fitted to threaded piston jacks. Lifting claws must
only be used with jacks having extended bases that extend under the toe of
the claw. They must ONLY be used for vertical movements of loads.
The recess on the underside of the top of the claw fits around the top of the
piston. The heel of the claw rests against the front face of the jack. Ensure
that the claw is seated properly before use and that the toe is as far under the
load as possible.

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OPERATING POSITIONS
The Jack should be used in the two positions shown below, ONLY. See
Figure 3.
STROKE LIMITER
The Jack is factory fitted with an internal by-pass valve which prevents the
jack piston exceeding maximum stroke. If the jack is operated in this
condition, oil passes back to the reservoir. If operation is continued, some oil
may by-pass the jack stop ring and appear on the top of the jack. Cease
operating jack and wipe off surplus oil.
OPERATING ENVIRONMENT
The jack is intended for use in industrial environments, in or outdoors between
temperatures of -20 to +50°C. Outside these parameters, consult Hi-Force
Ltd, before use.