C-Series Machine Screw Jack
A full copy of the C-Series Operation and Maintenance manual can be downloaded at
www.powerjacks.com/manuals. Alternatively a paper copy can be ordered from Power Jacks.
1-General
1.1 Before installing new parts, remove any rust preventative, protection grease etc.
1.2 Check before immediate installation for possible transit damage.
1.3 Components which have been stored for a long time (over 1 year) should be re-lubricated in working
conditions before they are put into operation.
1.4 Before putting the C-Series screw jack(s) into service, the User must ensure that the plant in which it is
installed complies with all applicable directives, especially those regarding health and safety at work.
1.5 Handle the screw jack with care. The C-Series screw jacks should be handled with care to avoid damaging
the machined drive shafts and the threads of the lead screw.
1.6 Before putting the units into service, check the lubricant level. If necessary top up the lubricant to the
required level.
1.7 Donotmixgreasesofdifferentnatureorspecications.
1.8 If the same type of grease already in use is not available, remove all of the existing lubricant completely and
ushitsinteriorthoroughlywithalightsolventbeforerellingwithanewlubricant.
1.9 The structure on which the C-Series screw jack(s) are mounted must have ample strength to carry the
maximumload,andshouldberigidenoughtopreventunduedeectionordistortionofthescrewjack
supporting members.
1.10 It is essential that the C-Series screw jack(s) be carefully aligned during installation so that the lead screw is
running true and the connecting shafts are exactly in line with the input drive shafts.
1.11 Wheninstallingseveralscrewjackstomoveacommonload/item/structure,thejacksshouldrstbe
connected to the structure. The load should be equally distributed between the screw jacks. The screw jack
input drive shafts should then be connected taking care not to turn the input shaft and lose the screw jack
position relative to the structure.
1.12 After the C-Series screw jack(s) is installed, shafting, gearboxes, motors, etc., are coupled together it should
be possible to turn the main drive by hand (no load on screw jack(s). If there are no signs of binding or
misalignment, the screw jack system is then ready for normal operation.
1.13 AftertheC-Seriesscrewjack(s)areinstalled,theyshouldbeoperatedthroughtheirfulltravelfourorve
times under minimum load conditions. If the arrangement operates satisfactorily and there are no signs of
binding or misalignment the C-Series screw jack(s) are ready for normal operation.
1.14 The screw jack should have a rated capacity greater than the maximum load that may be imposed on it.
1.15 The screw jacks should have a greater stroke than is needed in the actual installation. Should it be
necessary to operate the screw jacks at the extreme limits of travel it should be done cautiously.
1.16 Itisimportantthattheleadscrewsshouldnotbeclosedbelowthespeciedclosedheightdimensionofthe
screw jacks, otherwise serious damage may result to the worm gear.
1.17 Lead screw end stops are to prevent over-travel or loss of screw. These are not load supporting and should
