Hi-Force JAH620 Manuale di istruzioni - Pagina 4

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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.

OPERATING POSITIONS

The Jack should be used in the two positions shown

below, See Figure 3.

Figure 3

Hi-Force Limited – Prospect Way – Daventry – Northants NN11 8PL – United Kingdom

Tel: +44(0) 1327 301000: Fax: +44(0) 1327 706555: Website: www.hi-force.com

INSTRUCTION MANUAL: Aluminium Jacks

Model Series: JAS, JAH

STROKE LIMITER

PISTON STROKE LIMITING DEVICE:

For Operator safety, all JAH jacks are factory-fitted

with a fail-safe positive stop mechanism that

prevents the over-stroking of the piston under

loaded conditions beyond its maximum stated

travel length. If the jack is operated in the over-

stroke mode, oil is by-passed back to the reservoir

to prevent the piston travelling further than its

designed stroke distance.

If pumping of the jack with the operating lever is

continued with the piston in the over-stroke

operation mode, some oil may by-pass the stop

mechanism and appear at the top of the jack. If

this occurs, cease operating the jack and wipe off

any surplus oil.

PLEASE NOTE: That if the over-stroke

mechanism is operated and continuously pumped

with the piston under no load conditions, insufficient

pressure is achieved in the system to engage the

by-pass system of oil to the reservoir, and within a

short number of pumping actions, oil will appear at

the top of the jack.

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.