Power Jacks MMQG-SJ-CMS-EN-01 User manual
MAINTENANCE MANUAL
C-Series Machine Screw Jack
Quick Guide to Operation & Maintenance
MMQG-SJ-CMS-EN-01
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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
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C-Series Machine Screw Jack
be treated as an emergency device only and must not be allowed to come into contact with the worm gears
during normal working cycles otherwise serious damage will result to worm gears and bearings.
1.18 The maximum worm shaft speed for these screw jacks should not exceed 500 R.P.M. for heavy loads. Refer
to Power Jacks Limited for higher worm shaft speeds for lighter loads. the input power should not exceed
the power rating shown in the catalogues screw jack performance tables.
1.19 The lead screws should not be permitted to accumulate dust and grit on the threads. If possible, lead screws
should be returned to the closed position (retracted) when not in use.
1.20 If equipped with bellows boot the boot must not be compressed bellow its minimum height (consult Power
Jacks product literature or engineers).
2-Lubrication Of The Screw Jack
2.1 Thescrewjacksareshippedpackedwithgrease(unlessotherwisecalledfor)whichshouldbesufcientfor
one month of normal operation.
2.2 IMPORTANT NOTE – Lubricant suitability is dependent on duty cycle and ambient temperature. However in
general recommended lubricants are suitable for operation in an ambient temperature of -10ºC to +50ºC. If
in doubt consult with Power Jacks prior to installation and operation.
2.3 The maintenance engineer should establish a lubrication programme based on the screw jack’s duty and
use.
2.4 TheleadscrewrequiresalightgreaselmtobeappliedatInstallation.Theleadscrewshouldnotbeover
greased.
2.5 Note excessive grease should be avoided.
2.6 Itisrecommendedthatthescrewjackbettedwithbellowsorcoverstoprotecttheexposedscrewfrom
contamination from dirt and debris.
2.7 Ifthescrewjackoritssystemisttedwithabrakeensurethatundernocircumstanceslubricantgetsinto
the brake as this can cause brake failure due to loss of friction.
3-Recommended Lubricants
Manufacturer Lubricant
Castrol Spheerol EPL2
Esso Beacon EP2
Gulf Gulfcrown EP2
Mobiloil Mobilux EP2
Power Petroleum BP Energrease LC2
Regent Texaco EP2
Shell Gadus S2V220AC2 (Alvania WR2)
Table 1 - Normal Operation
Manufacturer Lubricant
Castrol Spheerol LMM2
Esso Beacon EP2 Moly
Mobiloil Mobilgrease XHP222 Special
Power Petroleum BP Energrease L2 1M
Regent Molytex 2
Shell
Shell Greases 5826
(Overseas)
Shell Alvania HDX2
Table 2 - Arduous Operation
Head Ofce
Balmacassie Commercial Park
Ellon
Aberdeenshire
AB41 8BX
Scotland (UK)
Tel: +44 (0)1358 285100
www.powerjacks.com
Manufactured in Great Britain
DESIGN WITH POWER
Power Jacks are an industry leader in the manufacture of quality
industrial lifting, positioning,material handling and power transmission
equipment. The products are supplied globally to most industry
sectors including nuclear, water, oil & gas, chemical, defence, steel,
aluminium, automotive, and others.
PRECISION SCREW JACKS . ELECTRIC LINEAR ACTUATORS .
PLANETARY ROLLER SCREWS . SPIRAL BEVEL GEARBOXES .
Supplied by Power Jacks. 2014 All rights reserved.
FM 23810
