Power Jacks C-Series - Manual (Page 3)

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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 The screw jacks are shipped packed with grease (unless otherwise called for) which should be sufficient for
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 The lead screw requires a light grease film to be applied at Installation. The lead screw should not be over
greased.
2.5 Note excessive grease should be avoided.
2.6 It is recommended that the screw jack be fitted with bellows or covers to protect the exposed screw from
contamination from dirt and debris.
2.7 If the screw jack or its system is fitted with a brake ensure that under no circumstances lubricant gets into
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